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Method for testing stage difference coordination and ampere-second characteristics of direct-current system device of power plant

A technology of differential coordination and DC system, applied in the field of testing, can solve the problems of power failure of feeder line, skipping trip, etc., and achieve the effects of good equivalence, elimination of misoperation, and simple wiring.

Pending Publication Date: 2022-07-29
POWER CHINA HENAN ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the incompatibility of the protection action characteristics of the upper and lower DC switches, during the operation of the DC system, when the upper and lower level electrical equipment has a short-circuit fault, it often causes the upper level DC circuit breaker to trip over the level, causing other feeder line outage accidents

Method used

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  • Method for testing stage difference coordination and ampere-second characteristics of direct-current system device of power plant
  • Method for testing stage difference coordination and ampere-second characteristics of direct-current system device of power plant

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Experimental program
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Embodiment

[0047] Embodiment: A test method for differential coordination and ampere-second characteristics of a DC system device in a power plant, the specific steps are as follows:

[0048] A. Test wiring:

[0049] The test power supply is initialized and tested, and the DC level difference is turned on to cooperate with the test system test equipment, and the test selection main interface is displayed, and the system self-test test;

[0050] B. Parameter setting test:

[0051] ①After selecting "Test parameter setting" on the main interface, press OK to enter the setting interface, press Left ← Right→ to switch the cursor movement position, and press Up ↑, Down ↓ to change the value of the cursor position data;

[0052] ②The cursor position and the set value are all automatically cycled, and there are default standard values ​​in use; if all parameters are set, press the cancel key to exit the setting and return to the starting state of the main interface;

[0053] ③Test equipment re...

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PUM

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Abstract

The invention discloses a stage difference cooperation and ampere-second characteristic test method for a direct current system device of a power plant, which comprises the following steps of: adding short-circuit grounding protection on the basis of original protection by measuring and calculating short-circuit grounding current and combining comprehensive short-circuit grounding characteristics of an air switch; according to the protection level difference configuration condition of the direct-current circuit breaker with the direct-current system short-circuit accident in the state that the protection value is set to be 1.05 times of the short-circuit current value of the superior and subordinate level difference cooperation test, whether the possibility of override action occurs or not is judged; an ampere-second characteristic test is carried out on a tested direct current circuit breaker, and whether the tested direct current circuit breaker meets a stage difference matching requirement or not is judged according to a measured ampere-second characteristic curve of the direct current circuit breaker; a proper test point is selected, the lower port position of each direct current air switch of the third-stage direct current power supply disc of the direct current power supply system is used as a short circuit point to carry out upper and lower stage difference matching test, short circuit is carried out at the test point, the short circuit current is small, and safety risk control in instrument equipment and the test process is well guaranteed.

Description

Technical field: [0001] The invention relates to a test method, in particular to a test method for step-difference coordination and ampere-second characteristics of a direct current system device of a power plant. Background technique: [0002] In the power system, the DC power system provides DC control or power supply for relays, circuit breakers, protection and automatic control devices, communication systems, etc., and is an important part of the power system. In the DC circuit, fuses and DC circuit breakers (DC air switches) are the main protection components for overcurrent, short circuit, and ground faults in each branch of the DC system. The selective cooperation between the protection switches is directly related to whether the failure of the system can be reliably controlled within the minimum range, and it is very important to prevent the damage of system equipment, the expansion of accidents and the failure of monitoring and control. The State Grid's "Twenty-fiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 何炜煜石普政穆娜杜喜信宿彬张隆江吴智君
Owner POWER CHINA HENAN ENG CO LTD
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