Testing device for outlet logics of main transformer, differential bus device, and automatic bus transfer device

Abstract

The invention discloses a testing device for outlet logics of a main transformer, a differential bus device, and an automatic bus transfer device. The testing device comprises an input and output unit, a CPU control unit and a liquid crystal display. The input and output unit includes an input module, an output module and a photoisolator. A switching value output contact of the output module is connected with a switching value input terminal of a relay protection tester; and a signal input terminal of the output module is connected with the photoisolator. 16 to 24 pairs of interfaces that are connected with collection contacts, a switching value input terminal that is connected with a switching value output contact of the relay protection tester and a switching value input terminal that is connected with an output contact of a trigger button are arranged on the input module; and a signal output terminal of the input module is connected with the photoisolator. And the CPU control unit consists of a collection contact information conversion module, a time recording module, a storage module and a data processor. According to the invention, pulses of all outlet press plates can be tested on the condition that protection only makes one-time motion.

Description

technical field [0001] The invention relates to an automatic control device for testing the displacement of an outlet contact of a relay protection of a power system, in particular to a logic test device for a main transformer, a bus differential, and a backup direct input outlet. Background technique [0002] At present, the conventional relay protection tester has not made a breakthrough in testing the logic and action time of multiple protection contacts. Usually, the test pulse of a relatively primitive multimeter or the action time of a single outlet contact is tested by a relay protection tester. Since various types of protection devices generally reset the entire group within 3-5 seconds after they operate, protection personnel have to add fault data again to test the operation time of other contacts, so as to judge the operation logic. For devices such as main transformers, bus differentials, and backup self-injections that involve many outlet contact circuits and co...

AI Technical Summary

Problems solved by technology

For example, how high the backup protection is, generally through multiple experiments to test the bus connection, the local side and the jump circuit of the high backup, but there is no way to test whether other related circuits have false exits. If you want to test whether other contacts are The exit will repeatedly test the protection action back and forth, wasting a lot of time

During the test, the protection device will generally return to the whole group 3-5 seconds after the action. Sometimes the protection group does not know after the whole group is restored. The relay protection testers still test according to the protection action, which may cause the relay protection personnel to make false tests;

[0004] (2) For bus differential protection: relay protection personnel often use the multimeter test method to test the action exit logic of the protection, but the multimeter test method cannot test the action time of the bus differential protection, so it is impossible to judge whether the action exit time meets the requirements. A lot of time will be wasted if each loop test is required;

[0005] (3) For standby automatic switching: the existing relay protection tester cannot test the time and exit logic of the complete action process of standby automatic switching. Usually, the standby automatic switching is tested in sections, and then the exit time and logic are tested step by step. In this way, the contact action that may be tested is incorrect.

[0006] During the first inspection of new substations and substations, it is required to fully inspect the action logic and time of protection. However, the current power system has put forward very high requirements for the duration of protection inspections. If the test is carried out according to the traditional method, not only may there be certain safety Hidden dangers, and may cause many projects not to be completed on schedule

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