The microcomputer relay protection tester has powerful test software in it, among which there is a universal and comprehensive test module called "AC test". The method of using the microcomputer relay protection tester to do the AC test is to use the "AC test" module. Using the "AC test" module, there are not only test units for 4-phase voltage and 3-phase current, but also independent 6-phase voltage and independent 6-phase current test units, and there is also a unit with 12 simultaneous output and press The sequence component outputs the test unit. These sequential components can be switched to each other. These test units can be used independently or call each other according to the actual needs of the test. The microcomputer relay protection tester has this "AC test" module, which can fully meet the AC test test of the power system under various conditions. The common point of the independent test units in this "AC test" module is that by setting the corresponding voltage or current as a variable, and assigning a certain change step to the variable, the test mode can be "manual", "semi-automatic", and "full-automatic". ”And other suitable power workers’ actual test methods, in order to test the action value, return value, and action time and return time of various voltage and current protections. The powerful test software of the microcomputer relay protection tester can automatically calculate the return immediately. coefficient.

Let’s take the commonly used “four-phase voltage and three-phase current” unit in the “AC test” module of the microcomputer relay protection tester as an example. This test unit can flexibly output 4-phase voltage, 3-phase current, 6-phase voltage, 6-phase current, 12 output at the same time and other multiple combinations. After directly setting the sequence component value, the instrument can automatically combine the voltage and current output of each phase, and can automatically change the output according to the sequence component. The amplitude and phase of each phase voltage and current output can be set arbitrarily, and the upper limit can be set for the amplitude. The amplitude, phase and frequency of each quantity can be set and changed, and the change step length can also be set arbitrarily. Ux can be set to a variety of output mode combinations, and can be set arbitrarily. The test mode "automatic, semi-automatic, manual" can be switched at will. The instrument can directly modify the amplitude, phase, step length and the number of variables in the output state. The instrument can also directly display the power value, which is used to calibrate the power meter. The action value, return value, action time, and return time can be measured by the instrument one by one.