A substation power transmission inspection device

Abstract

The invention discloses a substation power transmission detection device and relates to the field of substation power transmission detection. The substation power transmission detection device comprises a three-phase power switch serially connected with a temporary power source, a three-phase ampere meter and three-phase voltage regulating circuits with at least one circuit parallelly connected, each three-phase voltage regulating circuit comprises a three-phase voltage regulator, a normally open auxiliary contact, a three-phase isolation booster transformer and a three-phase voltmeter which are serially connected, inlet ends of all the three-phase voltage regulating circuits are parallelly connected prior to being serially connected with the three-phase voltmeters, and output ends of allthe three-phase voltage regulating circuits are the output end of the substation power transmission detection device. On the basis that the temperature power source is unaffected, a power system is subjected to test and power transmission detection in a substation; when the power supply system is subjected to no-load test, the situation of temporary power trip is less prone to occurrence; when entire equipment of the power supply system in the substation is subjected to power transmission detection, voltage display requirements of the equipment of the power supply system can be met, and entirereliability of the power supply system is judged conveniently.

Description

technical field [0001] The invention relates to the field of substation power transmission inspection, in particular to a substation power transmission inspection device. Background technique [0002] With the improvement of the construction speed of high-speed rail and subway, the power supply system in the substation of high-speed rail and subway (such as the high-voltage system, DC system and rectification system in the substation) is also receiving more and more attention. In high-speed rail and subway construction projects, before the power supply system in the substation is put into operation, testers need to test the power supply system (such as no-load test). During the construction process, there will be follow-up construction of the power supply system after the unit test is completed. (such as electrical connection between various devices, cable installation, etc.), it is extremely necessary to conduct an overall inspection of the power supply system at this time ...

AI Technical Summary

Problems solved by technology

[0004] (1) At present, when a power transmission test is performed on the electrical equipment of the power supply system (such as no-load test), the test instrument is powered by a temporary power supply, and the leakage protection device of the second and third-level distribution boxes of the temporary power supply often cannot meet the requirements of the transformer. Due to the low and sensitive leakage protection value of the temporary power supply for high-capacity systems such as high-voltage, DC, and low-voltage systems in the substation, it is very easy to cause the temporary power supply of the substation to perform a no-load test on the relevant systems of the substation with test instruments. Tripping, or even "leapfrog jumping" (that is, causing the temporary power trip of the upper layer), "leapfrogging" may cause a large-scale power outage, and both temporary power tripping and "leapfrogging" take a lot of time to repair, which not only reduces work Efficiency affects the work of other construction workers, and it is very unsafe

[0005] (2) At present, for the overall inspection of the power supply system in the substation, the general method is to directly connect the high-voltage power supply system to the temporary power supply (380V) of the substation for inspection. The disadvantage of this method is that the detection voltage is too low to cause high voltage The power supply system cannot normally display the working voltage, or the lower voltage after being transformed by the traction rectifier unit cannot meet the sampling requirements of the DC system, and thus it is impossible to judge whether the power supply system equipment can be put into use normally. For example, one of the standards for normal use is the power supply system The circuit connection is correct, but for the power supply system equipment that cannot display the working voltage normally, it is impossible to judge the correctness of the circuit connection

[0006] (3) The 400V low-voltage switchgear in the substation lacks special instruments for logic debugging. Since two power sources are required for switching and switching, the existing detection scheme is to connect the 400V switchgear to the temporary power supply through two self-made air switches for debugging. , On-site wiring is troublesome, work efficiency is low and unsafe

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