Reliability testing is enhanced by a well-configured power supply, with the AC variable frequency constant current power supply providing a settable and adjustable function that offers test engineers an excellent testing experience.
For the initial energization test of low-voltage circuit breakers, a high-intensity current will be injected into each phase of the breaker at a low voltage (typically 5~10V). The AC constant current inverter is set to a charging current strength of 10V/500A or 1000A, which can be determined based on the manufacturer's recommended values or the time-current curves published by the manufacturer. Each phase-related test circuit is usually powered by the breaker's line contact and returned through the load contact. The correct operation of the circuit breaker components—such as current transformers, conductors, contacts, tripping mechanisms, and mechanical trip devices—is verified through the initial energization test of each phase. Based on the time-current curve of the circuit breaker, each test current strength has a required time response for qualification. The initial energization test, which can check the sensors, wiring, tripping equipment, and conduction paths within the circuit breaker, has become a standard testing method for circuit breakers.Aviation Power
Primary injection tests are typically performed by experienced test technicians using specially manufactured injection test equipment, which is equipped with integrated measuring devices and a transformer (making the test equipment quite heavy and difficult to move). Primary injection tests are also potentially destructive due to the need to supply high currents to circuit breakers, mainly considering that the high current pressure carried by the circuit breakers can eventually lead to premature failure of the circuit breakers. Unfortunately, primary injection tests may be the method for testing certain low-voltage circuit breakers (such as molded-case circuit breakers, thermal circuit breakers, and thermal-magnetic circuit breakers). Secondary injection tests differ from primary injection tests in that they do not apply high currents by contacting the circuit breaker circuit and load.
Secondary energization tests typically do not connect the release unit to the standard monitoring circuit; instead, they are linked to a dedicated test device, which can energize, measure, and record the operation of the circuit breaker. The advantage of secondary energization tests is that they can trip the circuit breaker without the need to inject high currents to activate the release unit. A notable drawback of secondary energization tests is that they cannot test current transformers and certain contacts.400Hz Power Supply
