The relay protection tester under UHV power can help many power workers conduct various power tests more conveniently.
When using a microcomputer relay protection tester for testing, there is a type of test that you often need to use, which is frequency slip testing. When conducting testing, the process is quite complex and needs to be taken seriously. This article will briefly introduce how the microcomputer relay protection tester performs frequency slip testing.
The rated working voltage and output voltage value under rated working conditions are generally 57.740V. Rated operating frequency: The frequency value output during testing, usually 50Hz. Calculate the current and output current values of the load under rated conditions. Load overcurrent: Based on voltage, the load control current can be offset at different angles relative to other voltages. Pre fault time refers to obtaining the output no-load (or load) state during the pre fault time, which is usually mainly used to analyze the reset of analog signal relays or protections. Generally speaking, we must be able to ensure that information protection provides reliable recovery in the time before the failure.
The development stages of fault progression time and fault handling time can output the voltage and current working status of the equipment after the fault. In order to correctly search for the action boundary of this segment, it is necessary to ensure that the "fault analysis time" is set to be greater than the set action learning time of this segment, but less than the time of the next segment after the set action completion time. If the test data is far from the action boundary of information protection stage II, the setting time of "fault occurrence time" must be greater than stage II but less than stage III. In the "Output Signal Channel" submenu of the menu, you can learn to select six output control channels Ua Ub、Uc、Ia、Ib、Ic。 In the input box of "
The program provides 11 types of faults, including A, B, C grounding, AB, BC, CA three-phase short circuit, two-phase grounding, and three-phase short circuit. Fault direction: can be set as forward or reverse fault. Short circuit current: The fault phase current flowing through the protective device when a short circuit fault occurs. Anti shake time: When the closing or opening time of the protective device's action contact is less than this time, the contact action is not confirmed. Waiting time, set the search and learning process for each step, and after completion, maintain the current social output of the enterprise, waiting for environmental protection technology actions. In general, the waiting time should be set to be greater than the protection action deployment time. The reset frequency is the frequency that ensures the reliable reset of the protection control device within the reset time. Reset time, considering data protection, we may need to go through a certain reset process. Therefore, before testing, we first output the voltage and current states determined by the starting point of the change to ensure reliable protection reset before testing.
The microcomputer relay protection tester is a commonly used high-voltage power testing equipment, so everyone needs to be proficient in it.
