Flux Confined Three-Phase Fault Current Limiter

A technology of current limiter and three-phase fault, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, to achieve the effects of easy engineering, low cost and low loss of the whole machine
CN104332977BActive Publication Date: 2017-11-03NANJING NARI GROUP CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING NARI GROUP CORP
Publication Date
2017-11-03

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Abstract

The invention discloses a flux-constrained three-phase fault current limiter, which belongs to the technical field of electric engineering. The present invention includes a fault current limiter body, the fault current limiter is a transformer core, and three-phase coupling windings are installed on the transformer core, each phase coupling winding is wound on the transformer core in the same direction, and each phase coupling winding One of the three-phase lines connected to the grid respectively. The present invention can have no influence on the system transmission power and line current under the normal state of the system, and can quickly and effectively suppress the increase of the fault phase current when a single-phase ground fault occurs. The flux-constrained fault current limiter in the present invention The loss of the whole machine is relatively low, the loss is mainly copper loss, and its response speed is fast. Compared with the conventional fault current limiter, the fault current limiter in the present invention can realize timely fault current control based on the magnetic flux constraint mechanism at the moment of fault occurrence. Response, short response time, quick response to fault current.
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Description

technical field

[0001] The invention belongs to the technical field of electric engineering, and more precisely, the invention relates to a fault current limiter suitable for short-circuit protection of electric power systems. Background technique

[0002] With the rapid development of urban construction, the load and load density in the power grid increase, the transmission capacity of the power system continues to increase, and the network architecture of the power system becomes more and more complex, resulting in an increase in the level of short-circuit current in the power grid at all levels of the power system. The short-circuit capacity in some areas has reached or even exceeded the breaking capacity of the circuit breaker, while the large-capacity circuit breaker is limited by the manufacturing level and high cost. Excessive fault current has seriously threatened the safety and stability of the power system. It also constitutes a limiting bottleneck.

[0003] The f...

Claims

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