A Distributed Integrated Protection System for Distribution Network

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...

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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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