Double circulation test method for mechanical characteristic test of high voltage circuit breaker in substation

Abstract

The invention discloses a double-loop-current testing method for the mechanical characteristic test of a transformer substation high-voltage circuit breaker. The problem that when carrying out tests on site, a tester is faced with an induced electricity threat is solved. The double-loop-current testing method is characterized in that a grounding knife-switch (1) and a grounding knife-switch (2) on the two sides of the high-voltage circuit breaker are switched on, the two ends of the high-voltage circuit breaker are grounded, a signal wire A, a signal wire B and a signal wire C of an instrument are connected with lower ports of the grounding knife-switch (2), three grounding wires of the instrument are connected with lower ports of the grounding knife-switch (1), and a grounding terminal of the instrument is grounded; the instrument is operated to output I+, U+, I- and U- into a loop to form two loops, and the resistance changes in the switch-off and switch-on processes of the high-voltage circuit breaker are tested to obtain mechanical characteristic data of the high-voltage circuit breaker. The accurate data of the high-voltage circuit breaker can be measured effectively, it is avoided that the tester climbs up to connect the testing signal wires, and the induced electricity threat and induced electricity interference are effectively eliminated; the testing time is shortened, the working efficiency is greatly improved, electricity can be supplied as soon as possible, and therefore the double-loop-current testing method has huge economic value.

Description

technical field [0001] The invention relates to a power test and measurement technology, more precisely to a new test method for the action characteristic test of a high-voltage circuit breaker in a substation. Background technique [0002] In recent years, with the development of the power system, the power grid has become denser and the voltage level has become higher and higher, resulting in an increase in the potential threat of induced electricity in substations. Substation testers are faced with a strong threat of induced electricity when doing tests on site. High-voltage circuit breakers, as important equipment in substations, require frequent routine tests, and the threat of induced electricity faced by testers is also increasing. [0003] The traditional test method is that one end of the high-voltage circuit breaker is grounded, and the other end is connected to the signal sampling line of the test equipment. Such a test method requires testers to carry out high-a...

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Problems solved by technology

The problem with this method is: the volume of the lift car is relatively large, some intervals are relatively small, and the lift car is not easy to enter; during the operation, the technical requirements for the driver are very high, and the field test situation, the interval is relatively small. During the operation, if there is a little carelessness, the test vehicle will touch or damage the on-site equipment during the operation, resulting in huge economic losses

[0006] There are two disadvantages in this wiring method. First, the high-voltage circuit breaker grounding knife switch 1 is required for the test. When it is closed to open, the upper fracture has an induced charge, and the induced charge is introduced through the yellow, green, and red wires. Once the instrument is disconnected, once the discharge circuit of the instrument is not in good contact, people will directly contact the high voltage of the induced charge when operating the instrument. In this case, the high voltage will directly injure or fly people, which is very dangerous

Second, the high-voltage circuit breaker and the grounding switch are operated outdoors all the year round, and the surface is often oxidized by wind and rain, and dirt is attached to it. During the test, we need to close the grounding switch 1 and grounding switch 2. If Grounding switch 1 or grounding switch 2 is not really closed due to oxidation or dirt. When the tester climbs 8 meters to the fracture in this case to connect the three signal lines of yellow, green and red, the direct contact is High voltage for induced charge, very dangerous

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