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.

Long life health tea

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 ...

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 ...

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 ...

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.

Office table screen plate covering skin production process

The office table screen plate covering production process comprises the following steps that S1, a screen plate is prepared, a mounting groove is formed in the middle of the upper end face of the screen plate in the width direction of the screen plate, and the upper end face of the screen plate is divided into a groove inner end face on the inner side and a groove outer end face on the outer side by the mounting groove; s2, holding cloth is prepared, the holding cloth is attached to the outer surface wall of the screen plate, and the upper end of the holding cloth extends upwards to be attached to the outer end face of the groove; s3, covering cloth is attached to the inner surface wall of the screen plate, and the upper end of the covering cloth extends upwards to be attached to the inner end face of the groove; and S4, alloy parts are prepared, the alloy parts cover the upper end faces of the screen plates, and the lower ends of the alloy parts are assembled and clamped into the mounting ...

Medicine powder for liver and spleen diseases

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 ...

长寿保健茶

The present invention relates to a kind of long life health tea prepared with Chinese herbal medicines as main components. It is prepared with honeysuckle, American ginseng, rhubarb and desert cistanche, and has the beneficial effects of regulating and invigorating liver and kidney, invigorating spleen, drying wetness evil, clearing away heat and toxic material, raising immunity, etc.

Medicine for treating aurigo

Line parameter identification method and device based on distributed parameter model, equipment and medium

The invention provides a line parameter identification method and device based on a distributed parameter model, equipment and a medium. The method comprises the steps of collecting fault recording data of a first end and a second end of a power transmission line, and confirming first current data and first voltage data of the first end and second current data and second voltage data of the second end according to the fault recording data. And confirming power transmission line parameters based on a genetic algorithm and the third current data and the third voltage data of the second end. Wherein the third current data and the third voltage data are confirmed according to the first current data, the first voltage data, the second current data, the second voltage data and a distribution parameter model. According to the method, line parameter analysis and calculation are performed by using the distributed parameter circuit model and the genetic algorithm, so that calculation and identification ...

Flexible multi-terminal and DC power grid system oscillation disturbance source positioning method and system

The invention relates to the technical field of flexible direct-current power transmission and distribution, in particular to a flexible multi-terminal and direct-current power grid system oscillation disturbance source positioning method and system, and the method comprises the steps: obtaining the oscillation frequency and oscillation amplitude waveform of each harmonic wave in a direct-current side port voltage signal of each converter station in a flexible multi-terminal and direct-current power grid system; determining a disturbance source converter station in the flexible multi-terminal and direct-current power grid system; or, the oscillation frequency and the oscillation amplitude waveform of each harmonic wave in the direct current side port current signal of each converter station in the flexible multi-terminal and direct current power grid system are obtained, and the disturbance source converter station in the flexible multi-terminal and direct current power grid system is determined ...

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 ...

肝脾灵粉

The present invention relates to a kind of Chinese medicine preparation for treating hepatosis. The Chinese medicine is developed based on the integer view point of traditional Chinese medicine and prepared with 18 kinds of Chinese medicinal materials, including pangolin scales, turtle shell, leech, ground beetle, red sage, etc. and through crushing, sieving, rolling and other steps. It has the functions of strengthening body's resistance, promoting blood circulation to disperse blood clots, dredging the stagnated liver energy, alleviating mental depression, etc. and suitable for treating chronic movable hepatitis B, chronic unresolved hepatitis B, liver cirrhosis with swelling spleen, liver cancer in early stage and other hepatosis.

Rural distribution network energy storage battery charging optimization method based on battery SOC state

The invention relates to a rural distribution network energy storage battery charging optimization method based on the SOC state of a battery, and belongs to the field of battery optimizing.Before the rural distribution network energy storage battery is charged, the SOC estimation result of the battery is detected, and a proper charging scheme is selected according to different states of the battery. Determining the optimal initial current according to the initial current acceptability of the battery to perform constant-current charging; when SOC is larger than 10% and smaller than or equal to 75%, constant charging current is kept, and a negative pulse charging method is adopted for charging, specifically, charging is stopped before negative pulse, discharging is conducted in the negative pulse state, and charging is stopped after negative pulse; when SOC is larger than 75% and smaller than or equal to 90%, an MAS-pulse charging mode is adopted for charging; and when SOC is greater than ...

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 ...