Thu Nov 29 13:15:28 CST 2018
Temperature change is a major factor affecting the reliability and life of the circuit breaker. Understanding the cause of the temperature rise of the circuit breaker is of great significance to the design and practical use of the circuit breaker.
Temperature rise is the difference between the temperature of the test point and the temperature of the test environment after the appliance is thermally stable. The basic conditions of the temperature rise test of a typical miniature circuit breaker are as follows:
1, the general choice of ambient temperature 30 degrees Celsius;
2, the product through the rated current In;
3. When the temperature change does not exceed 1K per hour, the steady state condition is reached. General products reach thermal stability after 4 hours, because the heat generated by energization is equal to the amount of heat emitted by itself and the temperature no longer rises;
4, thermocouple (measurement of temperature and temperature rise instrument) to measure the temperature of each component, this time, the temperature of each component minus the ambient temperature around the circuit breaker, the temperature rise of the component.
According to the test requirements of GB10963.1-2005/IEC 60898-1:2002, the temperature rise of the connecting terminal connecting the external conductor shall not exceed 60K, the metal part of the operating part shall not exceed 40K, the external metal part shall not exceed 25K, and other external parts shall not More than 60K
Each batch of circuit breaker products shipped by MAXGE ELECTRIC undergoes temperature rise and other tests.