Distributed comprehensive protection system for power distribution network

Abstract

The invention discloses a distributed comprehensive protection system for a power distribution network. The distributed comprehensive protection system comprises a plurality of interval protection measurement and control devices and a ring network; each interval protection measurement and control device collects interval information of an interval connected with the interval protection measurementand control device, information sharing is carried out through the ring network, each interval protection measurement and control device can carry out fault judgment based on the multi-interval information, the corresponding interval protection measurement and control device completes tripping outlet, and fault removal is completed. According to the distributed comprehensive protection system, interval protection measurement and control, grounding line selection, arc light protection and distributed bus differential protection are integrated, the popularizing rate and accuracy of power distribution network system grounding line selection can be improved, rapid protection of a switch cabinet is achieved, medium-voltage bus protection configuration is perfected, and therefore optimization and integration of power distribution network relay protection are achieved, and the distributed comprehensive protection system has good application prospects.

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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