Views: 12 Author: Site Editor Publish Time: 2023-01-06 Origin: Site
The residual current circuit breaker is a relay protection device that can automatically disconnect the circuit or send an alarm signal when the residual current in the protected circuit exceeds the set value under specified conditions.
What are the working steps of residual current circuit breaker?
What are the precautions for using residual current circuit breaker?
What are the characteristics of residual current circuit breaker?
The role of the leakage circuit breaker is leakage protection and overload protection. Protective effects.
Residual current refers to the vector sum of the instantaneous value of the current through the main circuit of the residual current action protection device (zero-sequence transformer), and its effective value indicates that for a single-phase line, the residual current is the current of the phase to earth leakage; Phase line, the residual current is the vector sum of the instantaneous value of each phase current, expressed by its effective value.
In order to ensure the normal operation of the residual current circuit breaker, and to cut off the power supply quickly and reliably in the event of leakage, the use of the residual current circuit breaker that cannot work must be discovered as soon as possible, and repaired or replaced in time. Staff must regularly test the use of residual current circuit breakers.
For ordinary household residual current operated protectors, the test is usually performed by pressing the test button on the protector to make the protector trip manually, but this method can only detect whether the mechanical operating mechanism of the protector can operate normally. It is not possible to detect whether its electrical equipment is working properly.
Some residual current circuit breakers are also used to measure by connecting the phase lines to ground through a suitable resistor. This method can only verify whether the residual current protector can operate to a certain extent, but cannot measure its operating time and operating current. This method is neither desirable nor safe.
First, when the power grid is indeed grounded, the residual current circuit breaker operates normally. In this kind of normal action, due to the aging of the power grid and the change of the climate environment, the actions caused by the grounding point of the power grid account for the vast majority, while the actions caused by personal electric shock are very few.
(1) The residual current circuit breaker only has the function of leakage protection and power-off, and must be used in conjunction with protective elements such as fuses, thermal relays, and overcurrent relays.
(2) The residual current circuit breaker also has overload protection function.
(3) The residual current circuit breaker also has overload and short circuit protection functions.
(4) The residual current circuit breaker also has the function of short circuit protection.
(5) The residual current circuit breaker has the functions of short circuit, overload, leakage, overvoltage and undervoltage at the same time.
JIELI Electrical has been based in the low-voltage circuit breaker industry for nearly 20 years. Committed to the research and development, production, and supply chain management of MCB, RCCB and related supporting products.
