A low-capacity/low-resistance flexible switching system and its control method

Abstract

A low-capacity / low-flexibility-resistance switching system and a control method thereof are provided, A flexible switching system includes a voltage measuring subcircuit, overvoltage leveling subcircuit, the intelligent monitoring system and the flexible switch subcircuit, the control method consists of overhauling the flexible switching system, The fault of low capacity / low reactance and the needto switch low capacity / low reactance are three aspects of the corresponding control process, which can effectively suppress the voltage or current surge caused by the switching operation, will not harm the low capacity / low reactance and even the whole equipment where the switching switch is located, and also avoid the whole equipment scrapping situation. The invention adopts modular configurationintelligent monitoring system, each module is isolated from each other, the structure is clear, has good expansibility and applicability, and can be used for intelligent monitoring and analysis of other equipment in the substation. Moreover, the invention realizes the flexible switching with low volume / low resistance, ensures the flexibility and safety of the equipment operation, and improves thesafety and flexibility of the equipment operation.

Description

technical field [0001] The invention relates to the technical field of high voltage and insulation coordination, in particular to a low-capacity / low-resistance flexible switching system and a control method thereof. Background technique [0002] The low-voltage side shunt capacitor (hereinafter referred to as low-capacity) and the low-voltage side shunt reactor (hereinafter referred to as low-resistance) are important components of ultra-high voltage substations. The main functions of both are to control reactive power flow through switching operations and stabilize the power system. The operating voltage is of great significance to the safety, stability and economy of power grid operation. The switching operation of low capacity and low reactance is realized through the opening and closing operation of the switching switch connected in series. In engineering practice, the three-phase action time of the conventional switching switch is dispersed, and the single-phase action...

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Problems solved by technology

In engineering practice, the three-phase action time of the conventional switching switch is dispersed, and the single-phase action time is random. Shut-off and heavy breakdown often occur during the opening process of the switching switch. However, the existing technology lacks low-capacity / Overvoltage protection measures in the process of low-resistance switching. The switching operation will cause voltage or current shocks, which will cause harm to the entire equipment where the low-capacity / low-resistance and even the switching switch is located, or even cause the entire equipment to be scrapped. It is mainly reflected in the following aspects Aspects: 1) The closing inrush current generated when the low capacity is switched on can cause rapid loss of the circuit breaker contacts and affect the service life of the circuit breaker; The step-up overvoltage of the amplitude will cause adverse consequences such as increased energy consumption of the arrester and damage to the insulation of the equipment; 3) If multiple re-breakdowns occur when the low-resistance is cut out, a high-amplitude and high-steep step-up overvoltage may be formed , since the substation generally only installs lightning arresters on the bus side, and the reactor side lacks protection measures, it may damage the inter-turn insulation of the reactor

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