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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

Active Publication Date: 2017-11-03
NANJING NARI GROUP CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a fault current limiter based on magnetic flux constraint in order to overcome the defects of the fault current limiter in the prior art. Line to 500KV high-voltage transmission line and can deal with single-phase ground faults, so as to meet the demand for fault current limiter, an important equipment for power grid construction, in the case of increasing short-circuit capacity of the power grid, and realize the maintenance of system relay protection configuration and stability, Improve power grid transient stability and steady-state security

Method used

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  • Flux Confined Three-Phase Fault Current Limiter
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  • Flux Confined Three-Phase Fault Current Limiter

Examples

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Effect test

Embodiment 1

[0025] figure 1 and image 3 is an embodiment of the present invention. Such as figure 1 As shown, the flux-constrained three-phase fault current limiter of this embodiment has a transformer core as the fault current limiter body, and the transformer core is a single-phase double-column core. Three-phase coupling windings A, B and C are installed on the transformer core for connection with the three-phase line of the power grid, where the A-phase coupling winding is connected to the A-phase line of the power grid, and the B-phase coupling winding is connected to the B-phase line of the power grid. The phase coupling windings are connected to the C-phase line of the power grid, and the coupling windings of each phase are wound on the transformer core in the same direction.

[0026] Such as image 3 As shown, when a unidirectional line ground fault occurs in the power grid, such as a ground fault in the C-phase line, the magnetic flux generated by the A-phase current Ia and ...

Embodiment 2

[0029] figure 2 A second embodiment of the present invention is given. The difference between this embodiment and the first embodiment is that bypass switches ka, kb and kc are respectively connected in parallel to the incoming and outgoing points of the coupled windings of each phase. The bypass switch has two functions: 1) When the fault current limiter fails, the bypass switch can be used to cut off the fault current limiter; 2) After a one-way line ground fault occurs, the relay protection will cut off the faulty phase line , at this time, the bypass switch can be used to bypass the remaining non-faulty phase lines and the fault current limiter to ensure the power balance of the non-faulty phase lines, thereby maintaining the operation of the non-faulty phase lines.

[0030] Figure 4 to Figure 7 The simulated current diagram of the implementation effect of the present invention is given. Figure 4 It shows the instantaneous value of the three-phase current when the po...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
Inventor 吴维宁侯凯李惠宇吕宏水俞拙非武迪蒋应伟隗华荣
Owner NANJING NARI GROUP CORP
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