Relay protection sampling check system based on synchronous time checking and sampling check method thereof

Abstract

The invention discloses a relay protection sampling check system based on synchronous time checking and a sampling check method thereof, and belongs to the technical field of power relay protection. The thought of decentralized acquisition and centralized processing of automated data is applied to protection sampling check, a strong current generator replaces a high-power rectifying inverter, thedevelopment cost of a relay protection sampling integrity checking device is greatly reduced, and the wiring workload and the dangerousness of tests are reduced. Protective current, the voltage phaserelation correctness and the related multi-interval differential protection current sampling polarity consistency can be checked and verified under a capital construction state, the current situationthat currently, checking can be conducted only by using load current and work voltage during power supply is replaced, the complicated switching operation for phasor checking during power supply is omitted, the power supply time is greatly shortened, and the power grid risk is reduced.

Description

Technical field [0001] The invention relates to a relay protection sampling inspection system based on synchronous time synchronization and a sampling inspection method thereof, which is applied to the phasor inspection of line optical differential protection in the relay protection work of substations, and belongs to the technical field of power relay protection. Background technique [0002] At present, the analog phasor test in the substation uses the analog phasor car developed by the Electric Power Research Institute, which can generate a large current through the primary equipment to achieve the purpose of analog phasor inspection. But there are the following problems: [0003] 1) Limited by the length of the test line, it is impossible to complete the measurement of the analog phasor of the line longitudinal optical difference protection between the stations; [0004] 2) High cost-excluding the electric energy consumed during the test, only the instrument usage cost is 100,00...

AI Technical Summary

Problems solved by technology

[0003] 1) Limited by the length of the test line, it is impossible to complete the measurement of the simulated phasor of the line longitudinal optical difference protection between stations;

[0004] 2) High cost - excluding the power consumed during the test, only the cost of using the instrument is 100,000 yuan / day;

[0005] 3) The quantity is small - at present, only the provincial power transmission and transformation and the Electric Power Research Institute of Hebei Southern Power Grid have it, and no other prefecture-level units have it

High cost and small quantity limit its scope of use. It will only be used when a new station with a voltage level of 220kV and above is put into operation. It will not be used when new line intervals or main transformer intervals are added in the station.

[0006] 4) The test wiring workload is heavy

[0007] 5) Potential high voltage electric shock hazard

Once the phasor is found to be inaccurate during power transmission, it is necessary to pull the switch to re-transmit power, which will prolong the power transmission time and cause a relatively passive situation

[0012] Therefore, the analog phasor inspection of line light difference protection is currently a blank, and can only rely on load current inspection during power transmission.

At the same time, due to the promotion of intelligent stations, a merging unit is inserted between the current transformer and the line protection, and the conversion of electrical signals to optical signals occurs. There are many links, which makes the line optical difference protection more prone to problems.

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