Fast switching system based on LC vibration

Abstract

The invention relates to a fast switching system based on LC vibration. The fast switching system includes an isolation switch G1, a wire inlet end of the isolation switch G1 is connected with a powersupply, a wire outlet end of the isolation switch G1 is connected with a load through a high-speed eddy current switch K1, a wire inlet end of a capacitor C is connected with a wire inlet end of thehigh-speed eddy current switch K1, a wire outlet end of the capacitor C is connected with a wire outlet end of the high-speed eddy current switch K1 through a silicon controlled rectifier SCR and an electric reactor L in sequence, a nonlinear resistor FR is connected to two ends of the capacitor C in parallel, one end of the high-speed eddy current switch K2 is connected with the wire outlet end of a high-speed eddy current switch K1, and the other end of the high-speed eddy current switch K2 is connected with an energy storage power supply. The fast switching system based on LC vibration is simple in structure, fast in switching speed and safe and reliable, and when fluctuation of a supply voltage occurs and seriously affects normal operation of a load, through switching to a standby power supply, uninterrupted power supply to the load is realized, thereby ensuring continuous operation of the load.

Description

technical field [0001] The invention relates to the technical field of power grid power fast switching, in particular to a fast switching system based on LC oscillation. Background technique [0002] The internal power grid (referred to as internal network) of large and medium-sized enterprises is connected to the national grid (referred to as external network) to form a power supply system. A short circuit in any branch of the system will cause the voltage drop of the entire system, and the higher the voltage level of the branch where the short circuit occurs, the larger the impact area and the greater the drop value. After the short circuit occurs, the protection device of the branch will act to trip the circuit breaker to cut off the faulty branch. During the period from the occurrence of the short circuit to the removal of the fault, the system voltage has experienced a process from dropping to recovering. This phenomenon has different names in different industries. El...

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Problems solved by technology

[0003] At present, some power-sensitive equipment of industrial users, such as motors, frequency converters, high-voltage halogen lamps, relay protection, etc., when the main power supply (grid) has a voltage drop of more than 20mS, it is called "shock power" or a short-term power failure. (power outage time ≤ 2, 5S), it will cause accidents such as motor speed drop or stop, inverter shutdown, relay protection action, etc., resulting in production fluctuations, operation confusion, and product quality accidents in light cases, resulting in hundreds of thousands, hundreds of thousands Ten thousand economic losses, severe cases even cause major safety accidents, bringing huge economic losses and bad social impact to enterprises

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