A hidden fault detection method for a relay protection device

Abstract

The invention provides a hidden fault detection method for a relay protection device. The method includes the following steps that: I, voltage amplitude values of nodes in a power grid are measured and collected; II, state estimation is performed on the measured values, so that the estimated values of the nodes can be obtained, and the reference value of hidden failure detection is determined; III, the threshold value of the hidden failure detection is determined; and IV, hidden failure determination conditions are determined, so that whether a hidden failure exists can be judged. With the method adopted, a relay protection device with a hidden fault can be effectively detected out, and therefore, protection malfunction or protection operation failure caused by the hidden fault can be avoided, and the accident of the power grid can be further avoided.

Description

technical field [0001] The invention relates to a method in the technical field of electric power system relay protection, in particular to a hidden fault detection method of a relay protection device. Background technique [0002] People know that hidden faults refer to a kind of faults that have no impact on the system when the system is running normally. When some parts of the system and equipment change, such faults will be stimulated and cause large-scale faults in the system. [0003] The reasons for analyzing invisible faults are as follows: [0004] Both protective devices and secondary circuit components are likely to have hidden faults. Such as the protective outlet pressure plate, the connection of the protective device plug-in, the terminals of the secondary circuit wiring, the fiber-optic channel, etc. There are generally many reasons for invisible failures, which are roughly the following: [0005] (1) Some invisible failures of the device, such as aging and...

AI Technical Summary

Problems solved by technology

[0005] (1) Some invisible failures of the device, such as component aging failure, component damage, loose contact between plug-ins, etc.

[0006] (2) Wrong setting, calculation, fixed value, unreasonable coordination of fixed value, improper operation

[0007] (3) The secondary wiring terminals are not tight, poor contact, contact crossing wrong connection

[0008] (4) Maintenance and operation personnel accidentally touch the protection equipment and destroy data by mistake

[0009] (5) The protection device is not calibrated in strict accordance with the calibration procedures

[0010] (6) The operating environment of the protective equipment is not good, the maintenance personnel and operating personnel are sloppy with the maintenance of the equipment, and the inspection is not in place

The data sources of WAMS and SCADA systems are used as the basis to directly compare with the protection information obtained by the protection information system. Although the data of the data source has the advantages of high precision, its reliability cannot be guaranteed for direct comparison. When there is a deviation in the data source , will cause misjudgment

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