A method for preventing misoperation blocking

Abstract

The invention provides a method for preventing misoperation blocking, which is used for a power supply network. The method comprises the following steps: the incoming earthing switch of a lower substation or the signal of a handcart is connected with the opening entrance of a first line optical fiber differential protection device, and is transmitted to a second line optical fiber differential protection device corresponding to a higher substation through the line optical fiber differential protection device; If the optical fiber differential protection device of the second line receives the earthing state signal of the incoming earthing knife switch or the earthing state signal of the handcart, the locking and closing circuit is executed. If the optical fiber differential protection device of the second line receives the signal of ungrounded state of the incoming grounding knife switch or the signal of ungrounded state of the handcart, the unlocking and closing loop is executed. The incoming grounding switch or handcart is connected to the closing circuit of the corresponding feeder circuit breaker of the upper substation to realize the electric lockout and prevent the misoperation. Through the technical proposal of the invention, the purpose of far and near control anti-misoperation of the electric equipment of the upper and lower substations is achieved, and the misoperationof human factors is reduced.

Description

technical field [0001] The invention relates to the technical field of high-voltage power transmission, in particular to a method for preventing misoperation and locking. Background technique [0002] Whether the electrical equipment in the substation is safe or not is not only related to the equipment safety of the national power supply network and the personal danger of employees, but also affects the safe production of enterprises or units, the safety of employees, and the safety of residents, schools, etc. . Misoperation accidents of power equipment are malignant accidents that frequently occur in various electrical accidents in the power system. They are mainly caused by misoperations of operators, often causing casualties, equipment damage, large-scale power outages, and even oscillation and collapse of the power grid. Serious consequences. [0003] In order to avoid large-scale power outage accidents similar to those in Europe, America and other countries, the anti-...

AI Technical Summary

Problems solved by technology

[0010] 1. There is a blind area in the five-proof function between each feeder of the 35kV system of the main substation and the 10kV incoming cabinet of each lower-level device;

[0011] 2. There is a blind area in the five-defense function between the main substation's incoming line interval circuit and the upper-level State Grid substation

[0012] The error prevention when the upper and lower levels contact the electrical equipment for maintenance belongs to the problem of error prevention between the upper and lower substations (the upper and lower level substations are several kilometers away, even tens of hundreds of kilometers away, and belong to different enterprises and belong to different management personnel for daily management), and currently does not adopt any mandatory locking method, only relying on the quality and business capabilities of the substation operators themselves, as well as the strict implementation of the power system dispatching procedures by the operators at all levels, to prevent the maintenance of electrical equipment at the upper and lower levels Misoperation of power transmission to electrical equipment with a grounding knife switch will inevitably have potential safety hazards

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