Circuit breaker tripping reason analysis and processing, national electrical switch factory, www.jiandq.com
Most recently received a customer calls, reflect the breaker tripping problem. Some of the main circuit breaker, such as the DW series circuit breaker tripping, and automatic or manual are not closing etc.. I consulted the factory engineers, but also access to a number of relevant information, here a summary. However, that is, cause tripping for many reasons, not suitable for all situations, lists and some of the most common, mainly for universal breaker.
Generally speaking in the tripping situation, should do above all is not immediately contact inspection or repair, but must first determine whether tripping. If there is no reason to current and voltage fluctuation, probably just circuit breaker operation structure of the false action.
In a clear circuit breaker tripping phenomenon happened really, should start to identify causes. In general, tripping the circuit breaker main reason has two kinds, the first kind is short. As in the moist environment easily appear similar case. Remember to have a customer reflect a DW16-2500 ACB appeared normal rainy sunny day, often tripping, is due to a short circuit caused by. Finally after inspection is due to the control of short circuit, resulting in two lines into the burn caused by tripping phenomenon.
Second reason is the load, for example, if the line current is 200A, and the circuit breaker frame current 100A, access motor, the line of normal, but for the circuit breaker has obvious overload, it will cause the circuit breaker has been tripping. On Load Tripping, the most common is in our daily life, the current is too large to earth leakage circuit breaker ( such as DZ47le-32 leakage circuit breaker tripping ). In general based on the load and cause tripping is not supposed to happen, in the selection should be aware of the rated current circuit parameters. It also added a little knowledge: if the circuit breaker at the start of instant tripping phenomenon, is caused by short circuit. But during the starting process of the trip, is overload causes.
On the analysis of the tripping of the circuit breaker two reasons, a summary of some common analysis and treatment measures. The first is the judgment of line is still breaker problem. General process for:
Observation of a line there charred phenomenon, whether there is a smell, low-voltage cabinet in the two control loop having no fault
1 when there is a fault, then is excluded can on line problem, and the breaker unrelated.
2 no obvious fault point, in the absence of a load circuit breaker is not closed, the breaker can not be put into operation, is the problem of circuit breaker.
The general line is easy to solve, and if the circuit breaker problem, still need further examination, possible causes are: mechanical system failure, the free release of wear failure, operation mechanism. Here are two situations:
A ground fault trip ( ground fault indicator light) processing method for examination of breaker breaking current value and action time, if confirmed the presence of grounding fault should immediately find and eliminate. If there is no grounding fault, check the ground fault current setting value is appropriate, such as setting is not appropriate, should revise the ground fault current setting value.
B undervoltage release release, mechanical interlocking action general solution: to check the power supply is lower than that of 70%Ue and undervoltage tripper and the control unit is a fault.
Tripping of the circuit breaker can not be closed after many reasons, such as the undervoltage tripper lost power and make the circuit breaker can not switch on voltage too low or undervoltage trip coil power failure, will result in an inability to close. About not closed topic, in a later article described in detail. In this paper, some is just some experience, and can not solve all problems. Problems, better please the experienced engineers to solve or contact the corresponding manufacturers.