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Broken line identification method based on comparison of zero-sequence voltage differential values

A technology of zero-sequence voltage and identification method, applied in the direction of measuring electricity, measuring electrical variables, detecting faults according to conductor types, etc., can solve the problem of disconnection without grounding and disconnection on the load side, and achieve the effect of reliable identification

Active Publication Date: 2017-07-25
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent of the invention mainly solves the identification of broken wires not grounded and ground faults on the load side of broken wires

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  • Broken line identification method based on comparison of zero-sequence voltage differential values
  • Broken line identification method based on comparison of zero-sequence voltage differential values
  • Broken line identification method based on comparison of zero-sequence voltage differential values

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Embodiment Construction

[0022] figure 1 It is a schematic diagram of a 10kV distribution network simulation model based on PSCAD; in this model, a 35kV substation has two incoming lines, and the 10kV system distributed through two main transformers is in the form of a single busbar; the busbar has 4 main feeders, and the outgoing line The sections are numbered as shown in the figure. Among them, sections 1, 3, 5, and 10 are cables, sections 2, 9, 11, 12, and 13 are overhead insulated wires, and sections 4, 6, 7, 8, and 14 are overhead bare wires. The arc suppression coil is installed on the neutral point of the transformer used. When the switch K is open, the system is a neutral point ungrounded system; when the switch K is closed, it is an arc-suppression coil grounded system, and the overcompensation degree is taken as 10%.

[0023] The length of each section is: L 1 = 5.1 km, L 2 = 4km, L 3 = 3.8 km, L 4 = 7.5km, L 5 = 4km, L 6 = 10km, L 7 = 0.1km, L 8 = 3km, L 9 = 4km, L 10 = 3.2km, L...

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Abstract

The invention discloses a broken line identification method based on comparison of zero-sequence voltage differential values. A three-phase voltage of a bus and a three-phase current of each outgoing line are collected in a transformer station, an abrupt change value of the three-phase voltage amplitude and an amplitude of the three-phase current of each outgoing line are calculated on the basis of the three-phase voltage and currents, a zero-sequence voltage of the bus and a zero-sequence voltage of the high voltage side of a transformer of the power distribution network are calculated, zero-sequence voltage differential values of the outgoing lines are calculated, the magnitudes of the zero-sequence voltage differential values of all the outgoing lines are compared, and the outgoing line whose zero-sequence voltage differential value is highest is a fault line. According to the invention, only information of the transformer station is used, influence of a neutral point grounding manner and a broken line position of the power distribution network is avoided, a broken line not-grounding fault and a broken line loaded-side grounding fault can be identified reliably, and the power supply reliability of the power distribution network is improved effectively.

Description

technical field [0001] The invention relates to a relay protection method for a distribution network, in particular to an identification method for comparing zero-sequence voltage differential values ​​after the distribution network is disconnected. Background technique [0002] In recent years, due to the untimely handling of disconnection faults in the medium-voltage distribution network, accidents of personal injury and death have occurred from time to time, causing heavy losses to the society and bringing huge public opinion pressure to the power supply department. There are four forms of disconnection in the distribution network, namely disconnection without grounding, disconnection power supply side grounding, disconnection load side grounding and both sides of the disconnection being grounded. For the ground fault on the power supply side of the broken line and the ground fault on both sides of the broken line, it is solved by the traditional small current grounding l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 徐铭铭王鹏冯光马建伟牛荣泽徐恒博李宗峰张建宾孙芊王倩王文博贺翔王磊周宁
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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