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Pulse width test of relay protection tester

time:2020/6/7   source:华天电力  reading:334 time

In the work of power workers, three-phase relay protection testers are often used to test the performance of power transformers, relays and generators. The pulse width test is a relatively traditional test method in the three-phase relay protection tester, which is often encountered in practical work. At the same time, the pulse width test is divided into voltage modulation pulse width and frequency modulation pulse width. What should these two tests do?


Protection Relay Test Set.png


Pressure regulating pulse width test method:


Before the test, the voltage on the side to be combined does not meet the conditions of the same cycle (lower or higher than the voltage on the system side). If the frequency meets the conditions but is not equal, you can periodically turn on and off the angular difference energy on both sides . The lifting signal and suppression signal of the synchronization device are connected to the testers A and a, respectively. During the test, because the voltage does not meet the conditions for the same period, the device does not send the closing signal, but periodically sends the "up (down)" signal. At this time, the tester will be able to measure the voltage regulation pulse under this pressure difference. Width and voltage regulation period. Generally, the pulse width of the voltage regulation is linearly related to the pressure difference.


Frequency modulation pulse width test method:


Before the test, the voltage of both sides is set to meet the conditions of the same cycle, but the frequency does not meet the conditions of the same cycle (lower or higher than the frequency of the side to be merged). Connect the upper and lower frequency signals of the synchronization device to the tester and switch to B and B respectively. In the test, because the frequency does not meet the conditions of the same cycle, the device does not send the shutdown signal, but periodically sends the "uplink (downlink) frequency" signal. At this time, the tester will be able to measure the FM pulse at this frequency difference. Wide and frequency modulation period. Generally, there is a linear relationship between frequency difference and FM pulse width.


The voltage regulation pulse width test and frequency modulation pulse width test of the three-phase relay protection tester are relatively conventional high-voltage power experiments. Power workers need to master them in practice. During the test, you need to read the product description and use it in strict accordance with the instructions.


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