25-05-2017 дата публикации
Номер: US20170146471A1
Принадлежит:
A method for loose joint detection in medium voltage switchgears with busbar joints, circuit breaker upper and lower spouts, and cable connection joints, arranged in an air insulated housing, and medium voltage switchgear itself, in order to create an effective loose joint detection with lower operating expense, but with high performance and accuracy, involves measuring actual temperatures at a first phase as a first temperature (T), at a second phase as a second temperature (T), at a third phase as a third temperature (T), at predefined critical points, such as at the busbar joints, and/or at the circuit breaker upper spouts, and/or at the circuit breaker lower spouts, and/or the cable connection; and comparing temperatures in a logical dependency Ti>(Tj+dT), with i≠j, permuted with i from 1, 2, 3, and j from 1, 2, 3, and setting the alarm if the logical dependency is fulfilled. 1. A method for loose joint detection in a three phase medium voltage switchgear including busbar joints , circuit breaker upper and lower spouts , and cable connection joints , arranged in an air insulated housing , and several temperature measurement points , the method comprising:{'b': 1', '2', '3, 'measuring actual temperatures are measured at a first phase as a first temperature (T), at a second phase as a second temperature (T), at a third phase as a third temperature (T), at one or more predefined critical points;'} [{'br': None, 'i': Ti', 'Tj+dT', 'i≠j,, '>(), with'}, 'permuted with i from 1, 2, 3', 'and j from 1, 2, 3; and, 'comparing the temperatures in a logical dependencysetting an alarm if the above condition is fulfilled.2. The method of claim 1 , wherein the critical points include a busbar joint claim 1 , a circuit breaker upper spout claim 1 , a circuit breaker lower spout claim 1 , a cable connection claim 1 , or a combination of two or more of any of these.3. The method of claim 1 , wherein the critical points include a busbar joint.4. The method of claim 1 , wherein the ...
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