Short-time charged transmission method for testing busbar differential protection secondary circuit
A bus differential protection and secondary circuit technology, applied in emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc., can solve the problem of relay protection personnel allocation and workload, and the difficulty of on-site production safety management and control. Large, regular maintenance is not well targeted and other issues, to simplify the inspection process, save manpower and material resources, and improve labor productivity.
Inactive Publication Date: 2017-09-22
CHINA SOUTHERN POWER GRID COMPANY +1
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Problems solved by technology
The problems and difficulties existing in transmission work and protection regular inspection work are gradually emerging. For example, 1) the contradiction between transmission and regular inspection requiring equipment power outage and continuous and reliable power supply of the grid is becoming more and more prominent; 2) the contradiction between relay protection personnel allocation and heavy workload is becoming increasingly prominent. Outstanding; 3) Regular maintenance is not targeted, and the focus of maintenance is not prominent
The indiscriminate implementation of calibration inevitably has the disadvantages of wasting manpower and material resources and reducing labor productivity; 4) The frequency of transmission and regular inspection is high, and the difficulty of on-site safety production management and control increases.
[0005] In order to change the current situation of large operation and maintenance and maintenance workload, low efficiency and high maintenance cost of power transmission and transformation enterprises, the existing transmission and maintenance mode needs to be improved urgently
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Embodiment Construction
[0032] The technical solutions of the present invention will be further introduced in detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] figure 1 It is a schematic diagram of the circuit connection of the traditional microcomputer bus differential protection device. When the protection operates or the drive is driven, the bus differential protection device outputs a three-phase trip signal to the operation box, and the three-phase circuit breaker is tripped through the operation box. When closing, pass the three-phase closing signal of the measurement and control device, and close the three-phase circuit breaker through the operation box. The bus differential protection collects the signals of the voltage transformer and the current transformer during normal operation to realize the protection function.
[0034] figure 2 It is a schematic diagram of the short-time live transmission process for the bus differential protection, and ...
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A method for checking a secondary circuit of a bus differential protection in a short-time electrified transmission. The main content of the method includes: the primary side of the branch to be inspected is not powered off, and the bus differential protection device and its related circuits are inspected in the running state; The current and voltage are collected in real time. If a fault occurs in the bus area, the bus differential protection can operate correctly; the bus differential protection device sends out a transmission command for a short time to check the bus differential protection device and its secondary tripping circuit. By using this method, the protection device and the primary side can be inspected without power failure, which ensures the reliability of power supply and has significant economic benefits; it greatly simplifies the inspection process, reduces the workload of inspection work, and saves manpower and material resources; The security and reliability of protection are greatly increased.
Description
technical field [0001] The invention is suitable for the field of relay protection of electric power system, and more specifically relates to a method for checking the secondary circuit of bus differential protection in short-time electrified transmission. Background technique [0002] Relay protection is an important barrier to the safety of the power grid, and its reliable work is particularly important to protect the safe operation of the power grid. After the relay protection is put into operation, the safety of the entire power system can be fundamentally guaranteed by regular inspection of the equipment and timely elimination of various faults in the safe operation. [0003] There are many inspection items in the traditional periodic regular inspection method, and the inspection objects do not distinguish between the characteristics of the device and the primary and secondary, resulting in excessive or insufficient inspection; in fact, the regular inspection is mainly ...
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Login to View More IPC IPC(8): H02H7/22H02H3/04
CPCH02H7/22H02H3/044
Inventor 杨俊权赵曼勇刘千宽张弛丁晓兵曾林曾伟忠彭业陈志光骆树权徐鹏郑牛潼孙娴王海平顾羽洁韩坤肖远清
Owner CHINA SOUTHERN POWER GRID COMPANY