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

FM pulse width test method:

Before the test, the voltages on both sides were set to meet the conditions for the same cycle, but the frequency did not meet the conditions for the same cycle (lower or higher than the frequency of the side to be combined). Connect the upper and lower frequency signals of the synchronization device to the tester, and switch to B and B respectively. In the test, since the frequency does not meet the conditions of the same period, the device does not send the shutdown signal, but periodically sends the "up (down) frequency" signal. At this time, the tester will be able to measure the FM pulse under this frequency difference. wide and frequency modulation period. Usually, there is a linear relationship between frequency difference and FM pulse width.

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