Substation relay protection system measurement link hidden fault detection method

Abstract

The invention discloses a substation relay protection system measurement link hidden fault detection method, and belongs to the technical field of substation protection. The method comprises the steps of (S1) collecting voltage and current in an SV data transmission network, and obtaining m current sampling voltage Up and m current sampling current Ip in a cycle T; (S2) calculating a mean square error of a current actual power consumption quantity Qp according to the m current sampling voltage Up and the m current sampling current Ip; (S3) judging whether the mean square error of the current actual electricity consumption quantity Qp is larger than an electricity quantity threshold value Delta Q, executing a step (S4) if so, and executing a step (S5) if not, wherein Delta Q=|Q<^>|epsilon, Q<^> is a current theoretic electricity consumption quantity, epsilon is a given setting value; (S4) adding 1 to a counter Y; (S5) setting the counting Y to zero; and (S6) judging whether Y exceeds a maximum number Ymax after n cycles T, and detecting hidden faults of a relay protection device. According to the method, the hidden faults are detected through operating electricity quantity parameters, and the discovery rate of the hidden faults is improved.

Description

technical field [0001] The invention relates to the technical field of substation protection, in particular to a method for detecting hidden faults in the measurement link of a substation relay protection system. Background technique [0002] Hidden fault refers to the defect of the protection device that will only appear when the power grid fails, which will cause the protection to malfunction or refuse to operate, and even cause cascading faults in the power grid in severe cases. The hidden fault of the relay protection system has no effect on the primary system when the power system is in normal operation. When the system experiences disturbance or fault, the power system power flow redistribution may cause the protection device with hidden fault to malfunction and expand the scope of the accident. , and even cause large-scale power outages. [0003] From the perspective of incentives, hidden faults can be divided into two categories: one is hidden faults caused by non-h...

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Problems solved by technology

For example, when the CT / PT wiring is automatically loosened, it will cause zero drift of the sampling, which will increase the sampling error and even cause the circuit to be disconnected.

The second is hidden faults caused by human faults such as software settings or fixed value setting errors, including protection logic errors, poor adaptability of principles and action logic to abnormal situations, unreasonable setting of values, improper human operation or improper maintenance, etc.

However, there is a lack of research on hidden fault detection in relay protection devices. At present, the detection of hidden faults mainly relies on the experience of maintenance personnel after arriving at the scene, and fault location is carried out through the information of the background and relay protection devices. The complicated information of smart substations AND logic makes this manual processing method far from meeting the needs of actual operation

[0005] However, in the smart substation project, with the continuous upgrading of the device site and the continuous research and development of operating equipment, multiple links such as merging units, intelligent terminals, optical fiber terminal boxes, and GOOSE network switches have been added to the relay protection system. The composition of the system is gradually complicated, which also greatly increases the possibility of hidden faults in the relay protection system

However, the current relay protection system is poor in maintainability and highly dependent on integrators, making the relay protection system a "black box". Research on hidden fault detection in relay protection devices is imminent

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