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A method for inspecting a protection device and its circuit under the condition of no power failure of the line

A line protection, inspection and protection technology, applied in the field of power system

Active Publication Date: 2017-08-22
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In fact, the current protection devices are all computer-based, with strong self-inspection and online monitoring functions.

Method used

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  • A method for inspecting a protection device and its circuit under the condition of no power failure of the line
  • A method for inspecting a protection device and its circuit under the condition of no power failure of the line

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Embodiment Construction

[0034] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] figure 1 It is a schematic diagram of the connection of the external analog quantity through the test box.

[0036] The test box is connected to the line protection device through the communication interface of the line protection device, and a small signal is added to simulate the fault value for the longitudinal protection of live operation. The communication interface is Ethernet port, USB port or RS-232 port, etc. During the connection process between the test box and the line protection device, the line protection device does not shield the acquisition of external signals, but still collects the binary input, the status of the protection function pressure plate, the secondary current voltage and the AC voltage and current applied by the test box in real time. The test box is used to simulate and output the current and v...

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Abstract

The invention relates to a method for inspecting a protection device and its circuit under the condition that the line is not powered off. The method includes the following main steps: inspecting the line protection and its circuit under the condition of no power failure on the line; inspecting the line protection on both sides and its circuit separately; inspecting the two sets of line protection and its circuit in dual configuration; the two sets of line protection Check the current and voltage values ​​by comparing the devices; exit the longitudinal protection channel of the line to be tested, and disconnect its AC voltage switch; use the method of adding small signal analog to the test box to perform jump A, jump B, jump C, and coincidence tests respectively; print protection Action report. Through the method of simulating the amount of fault by adding a small signal, the inspection of the line protection device and its tripping circuit can be realized without power failure, which greatly shortens the working time of the inspection and reduces the power failure time.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to providing means for electric power system inspection, and is a method for carrying out line protection and tripping and closing circuit inspection by adding small signal simulation fault quantities under the condition of no power failure of the line. Background technique [0002] The fundamental purpose of the inspection of line protection and its tripping and closing circuit is to check whether its working status is normal, so as to ensure that it can reliably trip when a fault occurs in the line area; after meeting the reclosing conditions, it can be reliably reclosed through its closing circuit. [0003] The conventional inspection method has been carried out in the case of power failure, and the inspection is carried out according to the relevant inspection regulations. The items to be inspected include: inspection of the scale of the protection device, inspe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 汪际锋赵曼勇刘之尧曾伟忠张驰刘千宽陈志光曾林彭业刘世丹骆树权史泽兵徐鹏蒋绿海王建华赵志宏魏会利伍叶凯
Owner CHINA SOUTHERN POWER GRID COMPANY
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