Primary current injection test is a crucial process in the field of electrical engineering. It is used to check the integrity of electrical systems, including power transformers, switchgear, and protective relays.
This test involves injecting a high-current pulse into the system and measuring the response. The main purpose of the test is to verify the trip time of protective relays. The injection of current creates a magnetic field that triggers the relay, causing it to trip and isolate the faulted section of the system.
What is the Working principle of primary current injection tester?
(1)The measuring circuit includes one current measuring circuit and one current measuring circuit. Electricity can be increased as required
Voltage test) can extend the volt-ampere characteristic function.
(2)The current measurement circuit includes microcurrent zero impedance CT, programmable amplifier circuit and sampling circuit.
(3)The voltage measurement circuit includes PT isolated signal acquisition circuit, a programmed amplifier circuit and a sampling circuit.
(4) By 16- bit microcontroller using the computer digital real-time acquisition method, through the measurement of voltage signal amplitude, root
According to the voltage proportional relation, the voltage measured value can be calculated by measuring the voltage signal amplitude and setting electricity
The voltage value is compared to realize the function of automatic timing. According to the current ratio, the output of the equipment can be calculated
Overcurrent protection is realized by measuring the current/voltage signal amplitude and comparing it with the set value
The function.