Reduce the factor of space humidity on the incorrect action of circuit breakers

The design of modern circuit breakers precision, excellent quality, its own causes a very small probability of incorrect action, but external factors such as the daily average relative humidity is too high in certain space will cause circuit breaker malfunction or refuse to move. Outdoor mechanism housing, the Department of substation control cabinet is an important device, the internal components play a power, control, measurement and protection, if the outdoor substation mechanism housing, the Department of the internal control cabinet more than the daily average relative humidity 70% dew point condensation phenomena occur may lead to DC ground, AC discharge or short circuit occurs, the circuit breaker Malfunction or refuse to move, there are serious hidden dangers, and even the entire power grid of outdoor substation security and stability of a threat. In this paper, the change of temperature, rainfall, the use of heater and the seal of mechanism housing, cable channel water damp and other aspects of impact of the outdoor substation mechanism box's average relative humidity will be analyzed, and a series of effective measures to control the chamber humidity, down to 70% (dew point) to avoid outdoor mechanism housing's high space humidity causing circuit breaker malfunction, refused to move, which do not state the correct action.