LC-based discharging oscillation voltage maintaining device

Abstract

The invention relates to an LC-based discharging oscillation voltage maintaining device. The LC-based discharging oscillation voltage maintaining device comprises high-speed eddy switches K0 and K1, amaster reactor L2 and a short-circuit protection circuit, wherein an incoming line end of the high-speed eddy switch K0 is connected with an incoming line end of a power distribution cabinet, an outgoing line end of the high-speed eddy switch K0 is connected with an outgoing line end of the power distribution cabinet, an incoming line end of the high-speed eddy switch K1 is connected with an incoming line end of the high-speed eddy switch K0, an outgoing line end of the high-speed eddy switch K1 is connected with the outgoing line end of the power distribution cabinet via the master reactor L2, and the short-circuit protection circuit is connected in parallel with two ends of the high-speed eddy switch K0 and is used for controlling the high-speed eddy switch K0 to extinguish an arc in advance so as to achieve application of the master reactor L2. The LC-based discharging oscillation voltage maintaining device is simple in structure and rapid in action, and is safe and reliable, a short-circuit fault can be timely removed and isolated, the range of the short-circuit fault is prevented from being further expanded, a bus is effectively enabled not to loss pressure when the short-circuit fault occurs in a feeder branch, and zero loss of the master reactor after the short-circuit fault is removed also can be achieved.

Description

technical field [0001] The invention relates to the technical field of residual voltage maintenance of a power system bus, in particular to a voltage maintenance device based on LC discharge oscillations. Background technique [0002] With the development of the economy and the sharp increase in the electricity load of enterprises, there are more and more branches carried by the busbar in the power grid. The voltage of the bus is generally lower than 20% of the rated voltage. Only when the branch circuit breaker is disconnected and the short-circuit fault is removed, the bus voltage can be restored. During the period when the bus voltage sags, the power supply system of the enterprise is called "shock power". During the occurrence of "shock electricity", the residual voltage of the bus is very low, which interrupts the operation of some loads that have not experienced short-circuit faults, such as frequency converters, motors, relays, solenoid valves, etc. These loads that...

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Problems solved by technology

[0004] The busbar residual voltage holding devices currently used in the market control the input of the busbar protection reactor through a high-speed switch. During normal operation, the high-speed switch short-circuits the busbar protection reactor. The protective reactor is connected in series to the line, and it takes 18ms from the occurrence of the short-circuit fault to the opening of the high-speed switch. The short-circuit fault may expand to the bus side, which will cause a wider range of short-circuit in the power system

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