Tripping-prevention loop testing device for breaker

Abstract

The invention discloses a tripping-prevention loop testing device for a breaker. The tripping-prevention loop testing device comprises a shell, a common power source terminal, a switching-on terminal, a trip terminal, a switch and a counting display screen, wherein the common power source terminal, the switching-on terminal, the trip terminal, the switch and the counting display screen are fixed on the shell. The switching-on terminal is connected with the trip terminal in series. The switch is provided with a first moving contact, a second moving contact, a first auxiliary contact and a second auxiliary contact. The trip terminal is connected to the first moving contact in series to form a trip loop. The common power source terminal is connected to the second moving contact in series to form a closing loop. The first auxiliary contact and the second auxiliary contact are respectively connected with the counting display screen and electrically connected to monitoring switch auxiliary contacts through wires to form a closed loop. When the switch is closed, the closing loop and the trip loop are connected at the same time. The tripping-prevention loop testing device for the breaker can ensure simultaneity of switching and closing operation of the breaker, and further avoid the phenomenon that a tripping-prevention loop is displayed to be normal in the manual testing process, while false operation occurs in the operation process.

Description

technical field [0001] The invention relates to a test instrument in the electric power industry, in particular to a circuit breaker anti-jump circuit tester. Background technique [0002] Circuit breakers (switches) are important primary devices in power systems. During the operation of the circuit breaker (switch), after the circuit breaker is closed by manual or automatic device, if the operation control switch does not reset or the contact of the control switch and the contact of the automatic device are stuck, the protection action at this time will cause the circuit breaker to trip. Multiple "jump-close" phenomena, this phenomenon is called jumping. The jumping fault of the circuit breaker is very dangerous to the circuit breaker, and it is easy to cause damage to the mechanism, and even cause the circuit breaker to explode, causing the accident to expand, so blocking measures must be taken. The jumping fault of the circuit breaker generally occurs when the switch is...

AI Technical Summary

Problems solved by technology

However, this traditional manual verification method requires at least three people to operate, and the first person needs to keep the closing handle on, the second person gives the trip command at the same time, and the third person goes to the circuit breaker body to observe The number of operations of the circuit breaker counter

In this case, due to the artificial time error, the experimental test data is very discrete, which is very different from the actual operation, which increases the number of malfunctions of the circuit breaker in actual operation.

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