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A Distributed Integrated Protection System for Distribution Network

A comprehensive protection and distributed technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as long fault removal time, increased equipment investment and circuit complexity, limited sampling points and data processing capabilities, etc., to improve Penetration rate and accuracy rate, good application prospects, and the effect of perfect protection configuration

Active Publication Date: 2021-10-22
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the country's great investment in power grid construction, my country's transmission and transformation grid has achieved leapfrog development. However, compared with the achievements of the transmission grid, the development of the 35kV and below medium-voltage distribution grid is slightly insufficient.
The medium and low voltage power distribution system is widely distributed, and the single-phase ground fault of the line directly threatens the surrounding personal safety. The current line protection measurement and control devices usually have a certain ground fault detection capability, but due to the limited number of sampling points and data processing capabilities, The line selection effect is not good, and if a centralized grounding line selection device is specially configured, it will increase equipment investment and complicate the secondary circuit
At present, the busbars with a voltage level below 35kV in my country are generally not equipped with busbar protection due to high cost and secondary circuit reasons. When a fault occurs, it is mainly cut off by the transformer backup protection with a delay, and the transformer backup protection must be set in conjunction with the feeder protection, so the busbar failure It takes a long time to clear the fault, which may cause great harm to the primary equipment
There are many outgoing lines on the 10kV system, frequent switching operations, low insulation level, and frequent arc faults in the switch cabinet and busbar. At present, most of the arc protection adopts the master-slave mode, and the slave receives the output signal of the arc sensor in the switch cabinet and sends it to the To the host, due to the need to independently configure distributed sub-machines and hosts, the investment in equipment and the complexity of the circuit are increased, which restricts the application and promotion of arc protection

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  • A Distributed Integrated Protection System for Distribution Network

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the protection scope of the present invention.

[0025] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the present invention provides a distribution network distributed integrated protection system, especially suitable for medium voltage distribution network, including several interval protection measurement and control devices and ring network;

[0027] Preferably, each bay protection measurement and control device is equipped with an HSR ring network interface, and the ring network is an HSR ring network, whic...

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Abstract

The invention discloses a distributed comprehensive protection system for a distribution network, which includes several interval protection measurement and control devices and a ring network; each interval protection measurement and control device collects the interval information of the interval connected to it, and performs information sharing through the ring network , each bay protection measurement and control device can perform fault judgment based on multi-bay information, and the corresponding bay protection measurement and control device completes the tripping exit and completes fault removal. The invention integrates interval protection measurement and control, grounding line selection, arc protection and distributed busbar differential protection, can improve the popularity and accuracy of grounding line selection in the distribution network system, realize fast protection of switch cabinets, and improve the protection configuration of medium voltage busbars , so as to realize the optimal integration of distribution network relay protection, which has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of relay protection, and in particular relates to a distributed comprehensive protection system for a distribution network, in particular to a distributed comprehensive protection system for a medium-voltage distribution network. Background technique [0002] With the country's great investment in power grid construction, my country's transmission and transformation grid has achieved leapfrog development. However, compared with the achievements of the transmission grid, the development of the 35kV and below medium-voltage distribution network is slightly insufficient. The medium and low voltage power distribution system is widely distributed, and the single-phase ground fault of the line directly threatens the surrounding personal safety. The current line protection measurement and control devices usually have a certain ground fault detection capability, but due to the limited number of sampling points and da...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H7/22
CPCH02H7/22H02H7/26
Inventor 陈栋胡兵李玉平张玮王闰羿齐以年
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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