When you use a microcomputer relay protection tester to do tests, there is a kind of test that you often need to use, that is, the frequency slip test. When the test is in progress, the process is more complicated and needs to be taken seriously. This article is here for everyone Briefly introduce how the microcomputer relay protection tester does frequency slip test.
Rated working voltage, the output voltage value in the rated operating state, generally 57.740V. Rated operating frequency: the frequency value output during the test, generally 50Hz. The load calculates the current and the output current value in the rated state. Load carrying current through phase: Taking voltage as a reference, the load control current can be shifted in different angles relative to other voltages. Pre-fault time, the output no-load (or load) state is obtained during the pre-fault time, which is usually mainly used to analyze the reset of analog signal relay or protection. In general, we must be able to ensure that information protection provides reliable restoration in the time before failure.
The fault progress time and the fault handling time development stage can output the voltage and current working status of the equipment after the fault. In order to be able to search for the action boundary of this segment correctly, it is necessary to ensure that the "fault analysis time" is set to be greater than the setting action learning time of this segment, but less than the setting action completion time of the next segment. If the test data is away from the action boundary of the information protection stage II, the "fault occurrence time" must have a setting time greater than that of stage II but less than that of stage III. In the "output signal channel" submenu of the menu, you can study and select six output control channels Ua, Ub, Uc, Ia, Ib, and Ic respectively. In the input boxes of "Output Amplitude" and "Output Phase" at the upper left of the interface Enter the voltage and current output values of the students’ AC system.
The program provides 11 types of faults, including A, B, C grounding, AB, BC, CA phase short circuit, two-phase grounding and three-phase short circuit. Fault direction: It can be set as forward fault or reverse fault. Short-circuit current: the fault phase current flowing through the protection device when a short-circuit fault occurs. Anti-shake time: When the action contact of the protection device is closed or the opening time is less than this time, the contact action is not confirmed. Waiting time, setting the search and learning process at each step can maintain the current social output of the enterprise after the end, and wait for the time for environmental protection technical actions. Generally, the waiting time should be set to be greater than the protection action development time. The reset frequency is the frequency that guarantees the reliable reset of the protection control device within the reset time. The reset time, considering the data protection, we may need to pass the reset process for a certain time, so before the test, the voltage and current state determined by the starting point of the change are first output to ensure that the protection resets reliably before the test.
The microcomputer relay protection tester is a high-voltage power test equipment that everyone often uses, so everyone needs to be proficient.
