Device for inducing tumor cell apoptosis by high-voltage nanosecond pulse

A device for inducing apoptosis of tumor cell with high voltage nanosecond pulse belongs to technology field of electric impulse for treatment of tumor. The inventive device mainly comprises high voltage direct current module, pulse formation system, pulse measurement system, computer system, and power system. Amplitude value of high voltage nanosecond pulse is continuously regulated or preset between 0-9.9kV, repetition frequency is continuously regulated or preset between 2-100Hz, width is continuously regulated or preset between 200ns-1 mu s by separating to 7 grades, and numbers is regulated or preset according to treatment requirement. As the inventive device can induce apoptosis of tumor cell, is an unalloyed physical method, has no requirement of medicament assistance, thus can completely avoid toxic and adverse side effect of chemotherapeutics during treatment and adverse reaction such as inflammation, pain, ulcer and stammer, therefore the inventive device can be widely used in ...

Lissajous figure analytical method based transformer power frequency signal sensor system

The invention aims at solving measurement and switching of online voltage and current values confirming to requirements in a Lissajous figure analytical method and discloses a Lissajous figure analytical method based transformer power frequency signal sensor system. According to the technical scheme, the Lissajous figure analytical method based transformer power frequency signal sensor system comprises a mutual inductor and a signal processing circuit; the mutual inductor is used for collecting voltage or currents of a transformer; the signal processing circuit comprises two input ends and an output end. The Lissajous figure analytical method based transformer power frequency signal sensor system can effectively restrain common mode interference, switches differential signals into single-ended signals and meanwhile filters harmonic signals other than power frequency fundamental waves.

High-strength uniform-induction electric field generator based on Archimedes spiral coil

The invention discloses a high-strength uniform-induction electric field generator based on an Archimedes spiral coil. According to the generator, a pulse current is generated through an LRC discharge circuit, the generated pulse current is introduced in the Archimedes spiral coil to generate a pulsed magnet field, and an induced electric field parallel to a coil plane surface is generated in the surface region of the coil. The induced electric field is high in amplitude value and uniform in distribution, and the coverage area of the induced electric field is the area, where the coil is positioned only. When the coil is close to tumor tissue of a body surface, the induced electric field concentrates on tissue in the coverage area of the coil, influences on surrounding normal tissue are avoided and the purpose of non-contact, non-invasion and accurate tumor treatment can be realized.

Insulator pollution flashover pre-warning method and system based on leakage currents

The invention discloses an insulator pollution flashover pre-warning method and system based on leakage currents. An insulator pollution flashover pre-warning test system and the pollution flashover pre-warning method are provided based on deep study carried out on the acquiring of the leakage currents of supporting insulators, signal processing and extraction of characteristic quality. The test system comprises an LED optical fiber sensor, a signal preprocessing module, a data collecting module, a signal transmitting module, a power supply module and a data collecting and analyzing module. Through the utilization of the test system, pollution flashover measurement data are obtained, and finally a neural network model is obtained. The invention further provides the insulator pollution flashover pre-warning system based on the neural network model obtained through the scheme. Effective values, amplitude values, the number of pulses and relative humidity of the environment where the insulators ...

Infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge

The invention relates to an infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge, belonging to the technical field of partial discharge on-line monitoring of SF6 gas insulating electrical equipment. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer, a partial discharge free protective resistor, a standard capacitive voltage divider, a non-inductive resistor, a GIS analog element, a wide-frequency high-speed ultrahigh-capacity digital storage oscillograph and an infrared photoacoustic spectroscopy system. In the method of the invention, infrared photoacoustic spectroscopy detection is carried out on the decomposed gas of SF6 under partial discharge in the GIS analog element by the device of the invention. The invention has high sensitivity, little gas consumption, multiple detection components and strong anti-jamming capability, can effectively ...

AC power system voltage sensor

Multifunctional transformer signal sensor based on capacitive coupling and signal acquisition method

The invention discloses a multifunctional transformer signal sensor based on capacitive coupling. The multifunctional transformer signal sensor comprises a circle of thin metal band, a socket and a fixing clamp, wherein the socket is used for being connected with an external cable, the external cable is used for transmitting scanning signals, the socket is electrically connected with the thin metal band, the external cable is electrically connected with the thin metal band through the socket, and the fixing clamp is used for fixing the thin metal band and the socket. In the measurement process, the sensor is wrapped in the position, close to a flange, of a tap on the outer surface of a transformer bushing. The multifunctional transformer signal sensor based on the capacitive coupling principle can be conveniently installed on existing coil type devices such as operation transformers to be used for detecting deformation of winding devices through an on-line frequency response method. When ...

Tumor treating steep pulse equipment and process

Structure-variable gas insulation composite apparatus partial discharge experiment device and method thereof

The invention discloses a partial discharging experiment device of a structure-variable combined electrical gas-insulated apparatus and a method thereof, and belongs to the technical field of insulation online detection of electrical equipment. The partial discharging experiment device mainly comprises a GIS simulating element, a digital storage oscillograph and a signal generator, etc. By utilizing the device, the partial discharging experiment method carries out a pressurized experiment so as to collect ultrahigh frequency PD signals, carries out a signal injecting experiment, collects and corrects the ultrahigh frequency PD signals through programs, thus obtaining real waveform of the ultrahigh frequency PD signals. The device can simulate the T-shaped, L-shaped and bar-shaped structures of real GIS equipment. The method can carry out the experiment to the T-shaped, L-shaped or bar-shaped GIS structures by one to four insulated defect models, and the experiment is real, accurate and ...

Portable high-voltage nanosecond squarer

High precision broad frequency contaminated insulator leakage current sensor

The utility model discloses a leakage current sensor with high precision broadband pollution insulator, relating to an insulator AC leakage current detection sensor. The sensor of the utility model mainly comprises Rogowski coil and an integral amplifying unit and a coaxial cable; the Rogowski coil and the integral amplifying unit are connected through the coaxial cable. The utility model has the advantages of strongly anti-interfering ability, high detecting precision, sensibility up to 8.3mV/mA, bandwidth up to 2Hz to 100kHz, amplitude range of detecting current reaching 10MuA to 450mA; thus the utility model is widely used in online monitoring of insulator leakage current of power transmission line and transformer station and is also used for micro-current or small current monitoring of other electrical and electronic devices such as grounding current, leakage current and harmonic current.

Differential ring lightning current sensor based on printed circuit board and digital integration

The invention discloses a differential ring lightning current sensor based on a printed circuit board and digital integration. The differential ring lightning current sensor comprises an upper shielding case 2, a lower shielding case 3 and a printed circuit board differential ring 4. The upper shielding case 2 and the lower shielding case 3 are matched to form an airtight hollow case. The printed circuit board differential ring 4 is arranged in the cavity of the hollow case and comprises a substrate, a spiral coil formed in an etching mode is arranged on the substrate, and the two ends of the coil are led out of the hollow case through wires 6 respectively. By means of the printed circuit board differential ring based on the Faraday's law of electromagnetic induction, non-contact measurement can be achieved, the waveform of a lightning current in a power transmission line can be accurately measured, full-wave parameters of the lightning current can be measured, the measurement accuracy ...

Method for online monitoring deformation of transformer winding based on over-voltage response

The invention discloses a method for online monitoring deformation of a transformer winding based on over-voltage response, and belongs to the technical field of online monitoring. The method includes the following steps that firstly, a voltage measuring device is installed in the position, close to a flange, of a casing pipe end screen of a transformer, and voltage signals on the transformer winding are measured in real time; secondly, transformer voltage collected in real time is judged; thirdly, over-voltage signal data are preprocessed; fourthly, a frequency response curve based on over-voltage response is analyzed, feature quantity is extracted, the frequency response curve and the feature quantity are compared with an original frequency response curve and original feature quantity, and then the deformation failure situation of the transformer winding is analyzed; fifthly, deformation failures of the transformer winding are judged. According to the method, the deformation failure situation ...

Device for inducing tumor cell apoptosis by high-voltage nanosecond pulse

A device for inducing apoptosis of tumor cell with high voltage nanosecond pulse belongs to technology field of electric impulse for treatment of tumor. The inventive device mainly comprises high voltage direct current module, pulse formation system, pulse measurement system, computer system, and power system. Amplitude value of high voltage nanosecond pulse is continuously regulated or preset between 0-9.9kV, repetition frequency is continuously regulated or preset between 2-100Hz, width is continuously regulated or preset between 200ns-1 mu s by separating to 7 grades, and numbers is regulated or preset according to treatment requirement. As the inventive device can induce apoptosis of tumor cell, is an unalloyed physical method, has no requirement of medicament assistance, thus can completely avoid toxic and adverse side effect of chemotherapeutics during treatment and adverse reaction such as inflammation, pain, ulcer and stammer, therefore the inventive device can be widely used in ...

Pulse generating device based on voltage charging

The invention discloses a pulse generating device based on voltage charging. A circuit topology is shown as follows: an A end of a voltage source VDC is connected in series with a resistor RC and then is connected with a cathode of a diode D1; the anode of the diode D2 is grounded; the cathode of the diode Di is connected in series with an inductor Li and a switch Si and then is connected with the cathode of a diode Di + 1; the cathode of the diode Di is sequentially connected in series with an inductor Li, a switch Si 'and a load resistor RL and then is grounded; the anode of the diode Di is grounded; the cathode of the diode Dn is sequentially connected in series with an inductor Ln and a switch Sn and then is grounded; the cathode of the diode Dn is sequentially connected with the inductor Ln, the switch Sn 'and the load resistor RL in series and then is grounded, and the end B of the voltage source VDC is grounded. According to the modularized pulse generating device, the amplitude, ...

Experimental device of gas-sensitive temperature property test of carbon nano tube sensor and method

An experimental device of gas-sensitive temperature property test of a carbon nano tube sensor and a method belong to the technical field of property test of the carbon nano tube sensor. The device mainly includes a cylinder, a vacuum pump, an alternating current contactor, a digital display regulator, an electric stove, a thermal resistor, an impedance analyzer and the like. By using the device, the method conducts the gas-sensitive temperature property test of the carbon nano tube on different detection gases at different temperatures. The device and the method can measure the gas-sensitive temperature property of the carbon nano tube sensor under different defected gases, find out the optimal working temperature of the carbon nano tube sensor under defected gases, have high accuracy and sensitivity of measurement, convenient operation and easy promotion and application, and the method is simple. The device and the method can be widely applied to the analysis and application of the gas-sensitive ...

Device and method for treating tumors through irreversible electroporation

The invention relates to a device and a method for treating tumors through irreversible electroporation, belonging to the technical field of tumor treatment. The device mainly comprises a square wave pulse generation and measurement system, a signal conversion system, a man-machine communication system, a measurement control system and a power supply system. In the method, the device and a therapeutic electrode are used for treating the tumors through a program. Under the circumstance of no injection of chemotherapeutic drugs, microsecond square wave pulses are applied to tumor tissues, the entire tumor cell is fully damaged, so that the tumor cell dies due to irreversible electroporation, and the harm on the body of a patient caused by the side effect of the chemotherapeutic drugs is radically avoided. The invention has the characteristics of short treatment time, no pain, good treatment effect, high safety, convenient use, simple operation, convenient popularization and application and ...

Overcurrent protection locking device applied to solid-state switch of bipolar pulse generator

The invention discloses an overcurrent protection locking device applied to a bipolar pulse generator solid-state switch. The overcurrent protection locking device comprises a control signal generation module, a bipolar pulse source driving module, a bipolar pulse source power loop module, a load, a current detection module, an overcurrent detection judgment module and an overcurrent protection lock. The invention designs a bidirectional current fast response overcurrent protection module. The over-current protection module is divided into an over-current detection part and an over-current locking part. Meanwhile, digital circuit type over-current latch-up protection is adopted, so that the influence of strong electromagnetic interference in an industrial environment on software type over-current protection is avoided, and reliable action of protection is ensured. The overcurrent protection locking device applied to the solid-state switch of the bipolar pulse generator is provided for the ...

Power transformer winding deformation on-line detection method based on pulse coupling injection

The invention discloses a power transformer winding deformation on-line detection method based on pulse coupling injection, and belongs to the technical field of electrical equipment on-line detection. The method comprises the steps that (1) a high-voltage nanosecond square-wave pulse generator generates high-voltage nanosecond pulse signals; (2) the high-voltage nanosecond pulse signals are injected into a protection circuit through signal injection and transmitted into a transformer signal sensor installed on a transformer casing pipe to be coupled to a winding; (3) a data acquisition module acquires the high-voltage nanosecond pulse signals and current response signals of the neutral point of the tail end of the winding and converts the high-voltage nanosecond pulse signals and the current response signals into digital signals; (4) a data processing module carries out Fourier transformation on the digital signals, works out a frequency-response curve of the winding, calculates characteristic ...

Subnanosecond high-voltage pulse measurement system

The invention discloses a subnanosecond high-voltage pulse measurement system and relates to a device for measuring subnanosecond high-voltage pulse signals transmitted in a coaxial cable. The measurement system mainly comprises a coaxial capacitive voltage divider, a noninductive resistor, and an oscilloscope. The coaxial capacitive voltage divider in the device effectively uses stray parameters between inner and outer conductors of the structure and the coaxial cable. By adopting the crimping mode to connect the components, the lead-in inductance is effectively reduced, and the system measurement bandwidth is improved. The subnanosecond high-voltage pulse measurement system have the advantages of simple structure, convenient installation, no change of the signal transmission medium structure in the coaxial cable, and no influence on the originally transmitted signals, and can be widely applied to the measurement of high-voltage pulse signals in the coaxial cable.

A shielding case and measuring device with electricity for transformer winding trouble is electrified to be detected

The utility model relates to an electrified test equipment technology field of transformer winding trouble is a shielding case and measuring device with electricity for transformer winding trouble iselectrified to be detected, and this shielding case includes the box body of holder and shielding material system. The utility model has the advantages of reasonable and compact structure, convenientto use, it can completely cut off with external environment by the required circuit arrangement of umbilical cord electric -examination survey, and the interference that required circuit arrangement can not receive complicated electromagnetic field environment, weather environment and other unfavourable condition of transformer substation is surveyed in the umbilical cord electric -examination, and the assurance is electrified to detect normal reliability service, simultaneously, can prolong the life who detects required circuit arrangement with electricity.

High-voltage pulse generating device based on all-solid-state switch series-parallel connection

The invention discloses a high-voltage pulse generating device based on all-solid-state switch series-parallel connection. The high-voltage pulse generating device comprises a control signal generating module, a solid-state switch driving circuit module, an all-solid-state MARX generator module, a pulse transformer module and a load, the invention provides a high-voltage pulse generating device based on the combination of an all-solid-state Marx generator and a pulse transformer of IGBT series-parallel connection so as to realize the output of ultrahigh pulse voltage. According to the invention, the through-current capability and the voltage endurance capability of the Marx generator are improved through series-parallel connection of the IGBTs, and reliable operation of the high-voltage pulse generating device is ensured.

Light-emitting diode-based insulator leakage current fiber sensor system

The invention discloses a light-emitting diode-based (LED-based) insulator leakage current fiber sensor system, and belongs to the technical field of flash pollution online monitoring of electric equipment. The system comprises a fixed bracket, a sensor probe, a fiber, a photoelectric converter, a signal modulator, a data acquisition card, a computer and the like. The system is characterized in that: the sensor probe transmits light signals by using leakage current as luminous drive of an LED, then the light signals are transmitted to the photoelectric converter through the fiber and converted into electrical signals, and the electrical signals are transmitted to the computer for analysis through the signal modulator and the data acquisition card in turn. The system can selectively monitor different half waves of leakage current independently in real time, has the characteristics of strong anti-interference capability, high sensitivity, high precision of measured leakage current and good ...

Sulfur hexafluoride gaseous discharge micro component infrared detection device and method

A sulfur hexafluoride gaseous discharge micro component infrared detection device and method relates to a sulfur hexafluoride gaseous infrared absorption spectrum analysis device and method. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer, a non local discharge protective resistor, a standard capacitance voltage divider, a GIS analogue element, a non inductive resistance, a Fourier transform infrared spectrometer and a wideband high speed super capacity digital storage oscilloscope; wherein the gas tank in the Fourier transform infrared spectrometer is a long optical distance one. The method of the invention includes that discharge micro component detection is carried out on SF6 gas sample in GIS by utilizing the device ofthe invention. The invention can accurately detect various products produced by gas discharge decomposition of SF6 and has the characteristics of high detection precision, high spectrum resolution, good ...

Portable high-voltage nanosecond squarer

The invention relates to a portable high-voltage nanosecond squarer which belongs to a medicinal device for inducing cancer cell apoptosis by using a high-voltage nanosecond square wave pulse electric field. The portable high-voltage nanosecond squarer mainly comprises a power supply system, a high-voltage direct current module, a low-voltage power supply, a pulse forming system and a pulse shaping and counting system. The portable high-voltage nanosecond squarer has output pulses with highest amplitude of 15kV, pulse width adjustment range of 50ns-1us, rising edge gradient of reaching 10ns and controllable recurrence frequency of 0.2-15Hz; and the quantity of the output pulses of the portable high-voltage nanosecond squarer can be set. The portable high-voltage nanosecond squarer can be adjusted in multiple-parameters (pulse amplitude, pulse width, recurrence frequency, pulse quantity and the like), large-range and flexible and independent way, and is beneficial to researching the optimal ...

Lightning current measuring transducer based on differential ring

The invention relates to a lightning current measuring transducer based on a differential ring, relating to a lightning current parameter online monitor transducer of an overhead power transmission line. The transducer mainly comprises a screening outer shell, a screening inner shell, a differential ring, a junction box, an integrating resistor, a coaxial-cable, and the like. The invention has the advantages of not directly contacting a current-carrying conductor to be tested, accurately measuring the lightning wave form of the overhead power transmission line, and having high measurement precision and safety, good generality, stable measurement, simple structure, small size, light weight, convenient installation, low cost, and the like, thereby being widely used as the lightning current measuring transducer of the overhead power transmission line and the incoming line of a transformer station, especially as the lightning current measuring transducer of 110kV-500kV overhead power transmission ...

Fast-response digital over-current protection locking device

A fast-response digital over-current protection locking device comprises a control signal generation module, a solid-state switch driving module, a current detection module, an over-current detection judgment module and an over-current protection lock. The invention designs a fast-response over-current protection module. The over-current protection module is divided into an over-current detection part and an over-current locking part. Meanwhile, digital circuit type over-current latch-up protection is adopted, so that the influence of strong electromagnetic interference in an industrial environment on software type over-current protection is avoided, reliable action of protection is ensured, and normal operation of a system is ensured.

Double-light-path leakage current optical fiber sensor device

The invention discloses a double-light-path leakage current optical fiber sensor device and belongs to the technical field of monitoring pollution flashover of electric equipment on line. The device comprises a fixed bracket, a sensor head, an optical fiber, a converter, a modulator, an acquisition card and a computer, and is mainly characterized in that: the sensor head consists of two light emitting diodes (LEDs) and two protective circuits, is coupled to silicon photoelectric diodes of two photoelectric detectors of the converter through two optical fibers respectively, and is used for measuring positive and negative half cyclic waves of the leakage current respectively and the positive and negative half cyclic waves of the leakage current are synthesized into a complete full-wave signal by a differential comparison circuit of the converter. The invention has the characteristics that: the device monitors the full wave of an insulator string on line in real time, and has high anti-jamming ...

High-energy-efficiency 10 nanosecond high-voltage pulse generator device based on all-solid-state switch

The invention discloses a high-energy-efficiency 10-nanosecond-level high-voltage pulse generator device based on an all-solid-state switch. The high-energy-efficiency 10-nanosecond-level high-voltage pulse generator device comprises a power supply VDC, a resistor R, an n-level pulse generation module and a load Load, the voltage of the power supply VDC flows through the resistor R and then supplies power to the n-stage pulse generation circuit module; the n stages of pulse generation modules transmit high-voltage pulses to a load; the n-stage pulse generation module comprises n cascaded pulse generation circuits; each pulse generation circuit comprises a main circuit and a chopper circuit; the main circuit is used for generating high-voltage pulses; and the chopper circuit is used for adjusting the pulse width of the high-voltage pulse generated by the main circuit. According to the invention, the all-solid-state switch is adopted to generate the high-voltage ultrashort pulse with high ...

AC power system voltage sensor

The invention discloses a voltage sensor of an ac power system, which relates to a voltage signal catching device of the ac power system. The voltage sensor of the invention is composed of substation capacitive equipment, a current coil, an electronic transforming unit, an earth lead, and a coaxial cable. The voltage sensor of the invention can work under power frequency exchanging circumstance for a long time and can bear big attacking electric voltage, outputting signals of the voltage sensor are separated thoroughly with an electrified wire netting though only once separation. The invention has the advantages of small volume, light weight, convenient installment. The preciseness of testing power frequency voltage signals can be reached to 1 grade, uncertainty of voltages peak values which are tested and operated is less then +-1%, the uncertainty of time parameters is in a range of +-3%, and thereby the invention can apply for collecting the electric signal of an electric system 10kV ...

Subnanosecond high-voltage pulse measurement system

The invention discloses a subnanosecond high-voltage pulse measurement system and relates to a device for measuring subnanosecond high-voltage pulse signals transmitted in a coaxial cable. The measurement system mainly comprises a coaxial capacitive voltage divider, a noninductive resistor, and an oscilloscope. The coaxial capacitive voltage divider in the device effectively uses stray parametersbetween inner and outer conductors of the structure and the coaxial cable. By adopting the crimping mode to connect the components, the lead-in inductance is effectively reduced, and the system measurement bandwidth is improved. The subnanosecond high-voltage pulse measurement system have the advantages of simple structure, convenient installation, no change of the signal transmission medium structure in the coaxial cable, and no influence on the originally transmitted signals, and can be widely applied to the measurement of high-voltage pulse signals in the coaxial cable.

Partial discharge simulation experiment device of suspended metal particles in oil of transformer

The invention discloses a partial discharge simulation experiment device of suspended metal particles in oil of a transformer, which belongs to the technical field of partial discharge online monitoring of oil immersed transformers. The partial discharge simulation experiment device mainly comprises an induction regulator, a non-corona test transformer, a non-partial discharge protective resistor, a standard capacity voltage divider, a partial discharge generation device, a noninductive detection resistor, an ultrahigh frequency antenna, a coaxial cable, a broadband high-speed large-capacity digital storage oscillometer and the like. The partial discharge simulation experiment device can simulate stable partial discharge signals generated by the suspended metal particles in flowing oil with different oil flowing speeds at different temperatures when the oil immersed transformer is in a working stage. Therefore, the partial discharge simulation experiment device can be widely applied to ...

System for on-line detection of winding deformation based on overvoltage signal and response of transformer

The invention discloses a system for the on-line detection of winding deformation based on the overvoltage signal and response of a transformer, and belongs to the field of on-line monitoring of power equipment. The system comprises a coupling voltage-dividing unit, a signal collection unit, a signal processing unit, and a man-machine interface unit. The coupling voltage-dividing unit comprises a transformer overvoltage capacitive-coupling sensor, a voltage-divider low-voltage arm, and a voltage-divider matching part. The transformer overvoltage capacitive-coupling sensor is shaped like a band, and is tightly attached to a part, close to a flange, of an end screen of a transformer bushing in a winding mode. The voltage-divider low-voltage arm employs a plurality of capacitors of the same type, and the plurality of capacitors are arranged in a coaxial and symmetrical manner and are connected in series to form the voltage-divider low-voltage arm. The voltage-divider matching part employs ...

High precision broad frequency contaminated insulator leakage current sensor

The utility model discloses a leakage current sensor with high precision broadband pollution insulator, relating to an insulator AC leakage current detection sensor. The sensor of the utility model mainly comprises Rogowski coil and an integral amplifying unit and a coaxial cable; the Rogowski coil and the integral amplifying unit are connected through the coaxial cable. The utility model has theadvantages of strongly anti-interfering ability, high detecting precision, sensibility up to 8.3mV/mA, bandwidth up to 2Hz to 100kHz, amplitude range of detecting current reaching 10MuA to 450mA; thusthe utility model is widely used in online monitoring of insulator leakage current of power transmission line and transformer station and is also used for micro-current or small current monitoring ofother electrical and electronic devices such as grounding current, leakage current and harmonic current.

Lightning current measuring transducer based on differential ring

The invention relates to a lightning current measuring transducer based on a differential ring, relating to a lightning current parameter online monitor transducer of an overhead power transmission line. The transducer mainly comprises a screening outer shell, a screening inner shell, a differential ring, a junction box, an integrating resistor, a coaxial-cable, and the like. The invention has the advantages of not directly contacting a current-carrying conductor to be tested, accurately measuring the lightning wave form of the overhead power transmission line, and having high measurement precision and safety, good generality, stable measurement, simple structure, small size, light weight, convenient installation, low cost, and the like, thereby being widely used as the lightning current measuring transducer of the overhead power transmission line and the incoming line of a transformer station, especially as the lightning current measuring transducer of 110kV-500kV overhead power transmission ...

Discharge capacity monitoring and collecting method, device and system for ultrahigh frequency local discharge

The invention discloses a discharge capacity monitoring and collecting method for ultrahigh frequency local discharge, In the method, the pulse number exceeding the comparative level in each phase interval of an industrial frequency period is obtained through level comparison by analyzing the characteristic of an ultrahigh frequency local discharge signal and scanning a comparative level and the local discharge signal; the pulse number of different comparative levels is obtained through gradually increasing the comparative level, if no comparative pulse is output, the local discharge amplitude is smaller than the set comparative level, thus, a three-dimensional spectrogram of the ultrahigh frequency local discharge signal can be obtained through the pulse numerical values under different comparative levels; and conventional high-speed large-capacity data acquisition is changed into high-frequency pulse comparison counting, thereby simplifying an ultrahigh frequency local discharge monitoring ...

High pressure picosecond pulse generator

The invention discloses a high pressure picosecond pulse generator, and relates to the structure of the high pressure picosecond pulse generator. The high pressure picosecond pulse generator mainly comprises a power supply system, a marx generator, a peaking switch, a super high-frequency cable, a bottom cutting switch, and a coaxial load. The high pressure picosecond pulse output by the high pressure picosecond pulse generator has the characteristics of adjustable amplitude, changeable pulse width, controllable repetition frequency, compact structure, simple installation, convenient adjustment, stable and reliable work and the like. The high pressure picosecond pulse generator can be widely applied to the industries of communication, radar, medical treatment, geophysical prospecting and the like, and is used as a high pressure picosecond pulse signal source with the known characteristics.

Bipolar pulse generating device

The invention discloses a bipolar pulse generating device. A circuit topology is shown as follows: an A1 end of a voltage source VDC1 is connected in series with a switch S10 and a resistor Rc1 and then is connected with a cathode of a diode D11; the drain electrode of the switch S10 is connected with the A1 end, the source electrode is connected with the resistor Rc1, and the grid electrode is suspended; the cathode of the diode D1i is connected in series with an inductor L1i and a switch S1i and then is connected with the cathode of the diode D1 (i + 1); the cathode of the diode D1i is sequentially connected with the inductor L1i, the switch S1i 'and the load resistor RL in series and then connected with the source electrode of the switch S2i', and the anode of the diode D1i is grounded. According to the modularized pulse generating device, the amplitude, frequency and waveform of the output pulse are all flexible and adjustable, and constant amplitude and controllable waveform of the ...

Bundling electrode with integrated positive pole and negative pole of shape memory alloy

Polarity-adjustable high-voltage pulse generator

The polarity-adjustable high-voltage pulse generator comprises a control signal generating module, a photoelectric isolation driving module, a solid-state switch driving module, a Marx circuit low-voltage forming module, a relay polarity switching module, a pulse transformer boosting unit module and a load, the invention provides a polarity-adjustable high-voltage pulse source based on a Marx type circuit combination pulse transformer. Only a small number of stages of Marx circuits are needed to serve as a low-voltage output unit at the front end, and high-voltage output is achieved through boosting of a pulse transformer. Meanwhile, a primary winding of the low-voltage output unit is connected with the Marx circuit through a high-frequency relay. The polarity of the high-voltage pulse generator can be adjusted by controlling the switching of the relays, and the high-voltage pulse generator provided by the invention can realize high-amplitude single positive polarity, single negative polarity ...

On-line power transformer winding deformation monitoring method based on Lissajous characteristics

The invention aims to solve the problem of on-line monitoring of transformer winding deformation failure and provides an on-line power transformer winding deformation monitoring method based on Lissajous characteristics. The invention adopts the technical scheme as follows: the method comprises the following steps: 1), after input voltage U1 is added on the input end of a normal transformer with the load of ZL, the on-line output voltage U2, input current I1 and output current I2 of the normal transformer are measured; 2), after the input voltage U1' is added on the input end of a to-be-measured transformer with the load of ZL', the on-line output voltage U2', input current I1' and output current I2' of the to-be-measured transformer are measured; 3), the output current I2' is corrected, so that the corrected output current I21 is obtained; 4) the data is processed; 5), Lissajous figures of the normal transformer and the to-be-measured transformer are constructed; 6), the characteristic ...

Current sensor for polluted insulator leakage of AC high-voltage electric transmission line

The invention relates to a current sensor for the polluted insulator leakage of an AC high-voltage electric transmission line, in particular to a current sensor for monitoring pollution flashover of an electric transmission line. The current sensor mainly comprises a Rogowski coil with an iron core, a copper shielding shell and a coaxial cable joint and is characterized in that the iron core of the Rogowski coil is in a two semi-circle ring shape and is provided with two windings; and the shielding shell consists of a hollow groove in the two semi-circle ring shape and an upper cover in the two semi-circle ring shape. The invention has the advantages of simple assembling and disassembling process, very convenient field assembly and disassembly, high leakage current measuring precision, wide frequency band, good linearity, safe and reliable operation, and the like, thereby being widely used for newly-established and operated high-voltage electric transmission lines.

Partial discharge simulation experiment device of suspended metal particles in oil of transformer

The invention discloses a partial discharge simulation experiment device of suspended metal particles in oil of a transformer, which belongs to the technical field of partial discharge online monitoring of oil immersed transformers. The partial discharge simulation experiment device mainly comprises an induction regulator, a non-corona test transformer, a non-partial discharge protective resistor, a standard capacity voltage divider, a partial discharge generation device, a noninductive detection resistor, an ultrahigh frequency antenna, a coaxial cable, a broadband high-speed large-capacity digital storage oscillometer and the like. The partial discharge simulation experiment device can simulate stable partial discharge signals generated by the suspended metal particles in flowing oil with different oil flowing speeds at different temperatures when the oil immersed transformer is in a working stage. Therefore, the partial discharge simulation experiment device can be widely applied to ...

Device for treating tumors through irreversible electroporation

The invention relates to a device and a method for treating tumors through irreversible electroporation, belonging to the technical field of tumor treatment. The device mainly comprises a square wave pulse generation and measurement system, a signal conversion system, a man-machine communication system, a measurement control system and a power supply system. In the method, the device and a therapeutic electrode are used for treating the tumors through a program. Under the circumstance of no injection of chemotherapeutic drugs, microsecond square wave pulses are applied to tumor tissues, the entire tumor cell is fully damaged, so that the tumor cell dies due to irreversible electroporation, and the harm on the body of a patient caused by the side effect of the chemotherapeutic drugs is radically avoided. The invention has the characteristics of short treatment time, no pain, good treatment effect, high safety, convenient use, simple operation, convenient popularization and application and ...

Automatic gas filling warning device of SF6 gas insulated metal closed switch equipment

Aiming at the defect or deficiency of the existing manual SF6 gas filling device, the invention discloses an automatic gas filling warning device of SF6 gas insulated metal closed switch equipment. In consideration of determining the automatic stopping of SF6 gas filling operation according to the rated working gas pressure of a closed switch gas chamber, determining gas tank switching according to gas tank pressure and weight and giving out a corresponding warning according to environment state and gas filling state detection, a set of SF6 gas filling automatic stopping, warning, switching and monitoring device is developed to enable the GIS gas filling operation to be standardized, intelligent and automatic, so that the gas filling quality is ensured, the gas filling efficiency is improved, the GIS gas filling is safer, more efficient and economic, and the gas insulating strength and arc extinction capacity of closed switch equipment can be effectively guaranteed.

Pulse current source based on current charging

The invention discloses a pulse current source based on current charging. A circuit topology is shown as follows: an A end of a current source IDC is connected with a cathode of a diode D1; the cathode of the diode Di is connected in series with an inductor Li and a switch Si and then is connected with the cathode of a diode Di + 1; the cathode of the diode Di is sequentially connected in series with an inductor Li, a switch Si 'and a load resistor RL and then is grounded; the anode of the diode Di is grounded; the cathode of the diode Dn is sequentially connected in series with an inductor Ln and a switch Sn and then is grounded; the cathode of the diode Dn is sequentially connected with an inductor Ln, a switch Sn 'and a load resistor RL in series and then is grounded, and the end B of the current source IDC is grounded. According to the modular pulse current source, the output current, the frequency and the waveform are all flexible and adjustable, the amplitude of the output current ...

Infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge

The invention relates to an infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge, belonging to the technical field of partial discharge on-line monitoring of SF6 gas insulating electrical equipment. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer,a partial discharge free protective resistor, a standard capacitive voltage divider, a non-inductive resistor, a GIS analog element, a wide-frequency high-speed ultrahigh-capacity digital storage oscillograph and an infrared photoacoustic spectroscopy system. In the method of the invention, infrared photoacoustic spectroscopy detection is carried out on the decomposed gas of SF6 under partial discharge in the GIS analog element by the device of the invention. The invention has high sensitivity, little gas consumption, multiple detection components and strong anti-jamming capability, can effectively ...

Ultra-high frequency positioning and detection device of local discharge of electrical equipment and method thereof

The invention relates to an ultra-high frequency positioning and detection device of local discharge of electrical equipment and a method thereof, belonging to the technical field of experiments of local discharge of the electrical equipment. The device comprises a steep-sided pulse generator, an ultra-high frequency antenna, a high frequency coaxial cable and a high sampling rate oscilloscope. The device is characterized in that the steep-sided pulse generator is a nanosecond pulse generator. The method performs the positioning computation by using the device and a computer through a program and a positioning principle based on the time difference method. The device has simple connection; nanosecond pulse signals generated by the steep-sided pulse generator can really simulate ultra-high frequency signals of the local discharge of the electrical equipment and have strong interference resistance and high accuracy of read time different signals, thereby improving the positioning accuracy ...

Low-cost high-power bipolar high-voltage pulse generator

A low-cost high-power bipolar high-voltage pulse generator comprises a control signal generation module, a solid-state switch driving circuit, a dual-limit high-voltage pulse generator and a load. The invention provides a bipolar pulse high-voltage generator based on an optimized H bridge and a pulse transformer. Only one-stage H-bridge circuit is needed to output a certain amplitude voltage, and the voltage is boosted by using the pulse transformer boosting unit, so that the design index of the high-voltage pulse generator is achieved. According to the invention, high-amplitude bipolar pulse voltage and current waveform output can be realized. The optimized H-bridge circuit topology provided by the invention can inhibit rapid rise of current in a short time when the solid-state switch is over-current, so that the solid-state switch is protected. The pulse transformer provided by the invention is small in leakage inductance, optimizes the leading edge of the pulse voltage waveform, and ...

Light-emitting diode-based insulator leakage current fiber sensor system

The invention discloses a light-emitting diode-based (LED-based) insulator leakage current fiber sensor system, and belongs to the technical field of flash pollution online monitoring of electric equipment. The system comprises a fixed bracket, a sensor probe, a fiber, a photoelectric converter, a signal modulator, a data acquisition card, a computer and the like. The system is characterized in that: the sensor probe transmits light signals by using leakage current as luminous drive of an LED, then the light signals are transmitted to the photoelectric converter through the fiber and converted into electrical signals, and the electrical signals are transmitted to the computer for analysis through the signal modulator and the data acquisition card in turn. The system can selectively monitor different half waves of leakage current independently in real time, has the characteristics of strong anti-interference capability, high sensitivity, high precision of measured leakage current and good ...

Cooperative pulse generating device

The invention discloses a collaborative pulse generating device. A circuit topology is shown as follows: an A end of a voltage source VX is connected in series with a resistor Rxc and then is connected with a cathode of a diode Dx1; the cathode of the diode Dxi is connected in series with an inductor Lxi and a switch Sxi and then is connected with the cathode of the diode Dx (i + 1); the cathode of the diode Dxi is connected with the ground after being sequentially connected with the inductor Lxi, the switch Sxi ', the diode Dxi' and the load resistor RL in series, the anode of the diode Dxi is connected with the ground, and the end B of the voltage source VX is connected with the ground.

Sulfur hexafluoride gaseous discharge micro component infrared detection device and method

A sulfur hexafluoride gaseous discharge micro component infrared detection device and method relate to a sulfur hexafluoride gaseous infrared absorption spectrum analysis device and method. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer, a non local discharge protective resistor, a standard capacitance voltage divider, a GIS analogue element, a non inductive resistance, a Fourier transform infrared spectrometer and a wideband high speed super capacity digital storage oscilloscope; wherein the gas tank in the Fourier transform infrared spectrometer is a long optical distance one. The method of the invention includes that discharge micro component detection is carried out on SF6 gas sample in GIS by utilizing the device of the invention. The invention can accurately detect various products produced by gas discharge decomposition of SF6 and has the characteristics of high detection precision, high spectrum resolution, good ...

Structure-variable gas insulation composite apparatus partial discharge experiment device and method thereof

The invention discloses a partial discharging experiment device of a structure-variable combined electrical gas-insulated apparatus and a method thereof, and belongs to the technical field of insulation online detection of electrical equipment. The partial discharging experiment device mainly comprises a GIS simulating element, a digital storage oscillograph and a signal generator, etc. By utilizing the device, the partial discharging experiment method carries out a pressurized experiment so as to collect ultrahigh frequency PD signals, carries out a signal injecting experiment, collects and corrects the ultrahigh frequency PD signals through programs, thus obtaining real waveform of the ultrahigh frequency PD signals. The device can simulate the T-shaped, L-shaped and bar-shaped structures of real GIS equipment. The method can carry out the experiment to the T-shaped, L-shaped or bar-shaped GIS structures by one to four insulated defect models, and the experiment is real, accurate and ...

Device for detecting deformation of transformer winding based on pulse on-line injection

The invention discloses a device for detecting the deformation of a transformer winding based on pulse on-line injection, and belongs to the technical field of on-line detection of power equipment. The device comprises an all-solid-state high-voltage nanosecond square-wave pulse generator, a signal injection and protection circuit unit, a transformer signal sensor unit, a current sensor unit, a high-pass filter unit, a signal collection unit, and a signal processing unit. The device achieves the non-intrusive on-line detection of the transformer winding. During detection, a conventional wiring mode of a power system does not need to be changed, so the system is safer. The system employs a high-voltage nanosecond pulse signal excitation winding, avoids power frequency and a part of interference signals, improves the capability of anti-electromagnetic interference, can achieve quick detection under the condition that only several pulses are inputted because a high-voltage nanosecond pulse ...

Current sensor for polluted insulator leakage of AC high-voltage electric transmission line

The invention relates to a current sensor for the polluted insulator leakage of an AC high-voltage electric transmission line, in particular to a current sensor for monitoring pollution flashover of an electric transmission line. The current sensor mainly comprises a Rogowski coil with an iron core, a copper shielding shell and a coaxial cable joint and is characterized in that the iron core of the Rogowski coil is in a two semi-circle ring shape and is provided with two windings; and the shielding shell consists of a hollow groove in the two semi-circle ring shape and an upper cover in the two semi-circle ring shape. The invention has the advantages of simple assembling and disassembling process, very convenient field assembly and disassembly, high leakage current measuring precision, wide frequency band, good linearity, safe and reliable operation, and the like, thereby being widely used for newly-established and operated high-voltage electric transmission lines.

Plasma arc generating device with axial airflow regulation and control function

The invention discloses a plasma arc generating device with an axial airflow regulation and control function. The plasma arc generating device comprises a high-voltage electrode, a grounding electrode, an insulating shell head, an arc gas inlet pipe, a pole center control gas inlet pipe, a bypass control gas inlet pipe, an insulating shell body and an insulating shell tail. When arc generation gas, electrode center control gas flow and bypass control gas flow are introduced into the insulating shell, the high-voltage electrode and the grounding electrode discharge the arc generation gas under the action of a voltage signal, so that a plasma arc is generated; in the process of generating the plasma arc, the flow speed of the electrode center control airflow and the flow speed of the bypass control airflow are regulated and controlled, pressure gradient is generated around the arc, the speed field and the pressure field of electrode discharge are controlled, convection heat dissipation and ...

Lightning shielding failure and back flashover recognizing method of overhead power transmission line

The invention discloses a lightning shielding failure and back flashover recognizing method of an overhead power transmission line. The method includes the steps of firstly, obtaining the level difference of an insulator string and a buried current signal of a tower; then, judging the position of a lightning strike according to a lightning strike position feature value; finally, judging a lightning shielding failure and a back flashover, wherein when a lightning strike point is located on the top of the tower and a first minimum value is smaller than a threshold, back flashover occurs in the tower, when a second minimum value is smaller than the threshold, back flashover occurs in an adjacent tower, otherwise, no faults exist in the back flashover, when the lightning strike point is located on a wire and the first minimum value is smaller than the threshold, the lightning shielding failure occurs in the tower, if the second minimum value is smaller than the threshold, the lightning shielding ...

High pressure picosecond pulse generator

The invention discloses a high pressure picosecond pulse generator, and relates to the structure of the high pressure picosecond pulse generator. The high pressure picosecond pulse generator mainly comprises a power supply system, a marx generator, a peaking switch, a super high-frequency cable, a bottom cutting switch, and a coaxial load. The high pressure picosecond pulse output by the high pressure picosecond pulse generator has the characteristics of adjustable amplitude, changeable pulse width, controllable repetition frequency, compact structure, simple installation, convenient adjustment, stable and reliable work and the like. The high pressure picosecond pulse generator can be widely applied to the industries of communication, radar, medical treatment, geophysical prospecting and the like, and is used as a high pressure picosecond pulse signal source with the known characteristics.

Pulse generating device based on pulse charging

The invention discloses a pulse generating device based on pulse charging. A circuit topology is shown as follows: an A end of a pulse source Vpulse is connected with a cathode of a diode D1; the anode of the diode D2 is grounded; the cathode of the diode Di is connected in series with an inductor Li and a switch Si and then is connected with the cathode of a diode Di + 1; the cathode of the diode Di is sequentially connected in series with an inductor Li, a switch Si 'and a load resistor RL and then is grounded; the anode of the diode Di is grounded; the cathode of the diode Dn is sequentially connected in series with an inductor Ln and a switch Sn and then is grounded; the cathode of the diode Dn is sequentially connected with an inductor Ln, a switch Sn 'and a load resistor RL in series and then is grounded, and the end B of the pulse source Vpulse is grounded. According to the modularized pulse generating device, the amplitude, frequency and waveform of the output pulse are all flexible ...