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Intelligent phase-change switch phase-change system

A commutation switch and switching technology, which is applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc., and can solve the problems of power supply voltage degradation, distribution transformer output reduction, and distribution transformer zero-sequence current Increase and other problems, to achieve the effect of solving three-phase load rebalancing, short load power-off time, and simple logic implementation

Inactive Publication Date: 2018-11-16
NANCHANG INST OF TECH
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Problems solved by technology

The impact of unbalanced three-phase load on distribution sub-area mainly includes four aspects: 1) increase of distribution transformer and line loss; The output of the electric transformer is reduced, and the efficiency of electric energy conversion is reduced; 4) The unbalanced operation of the three-phase load causes the zero-sequence current of the distribution transformer to increase, and the eddy current loss caused by it increases the operating temperature of the distribution transformer, endangering its safety and life

Method used

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  • Intelligent phase-change switch phase-change system
  • Intelligent phase-change switch phase-change system
  • Intelligent phase-change switch phase-change system

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Embodiment 2

[0038] Embodiment 2: On the basis of Embodiment 1, the fourth switch, sixth switch, seventh switch, and eighth switch of this design are all bidirectional thyristors. The third switch, fifth switch, ninth switch, tenth switch and eleventh switch are ordinary relays. The single-pole double-throw relay of the first switch and the second switch adopts the above-mentioned switches, which not only has low production cost, but also is convenient to use, simple to operate, and has good stability.

[0039] The specific implementation mode of the user: 1. Detect the unbalance degree of the three-phase current, if the unbalance degree> 15%, the unbalance degree after phase sequence switching is lower than the current unbalance degree, and when the current is between 1A and 50A, the commutation switch is allowed to perform automatic commutation and switch the load from the current phase to the minimum load phase .

[0040] 2. Perform commutation switching according to the logic from State 1 ...

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Abstract

The invention discloses an intelligent phase-change switch phase-change system comprising a first switch, a second switch, and a third switch; a fixed contact of the first switch is connected with anA phase and a sixth switch; another fixed contact of the first switch is connected with B phase and a seventh switch; a movable contact of the first switch is connected with one fixed contact of the second switch; another fixed contact of the second switch is connected with C phase and a 9th switch; the other end of the sixth switch is connected with a 9th switch; the other end of the 7th switch is connected with a 10th switch. The intelligent phase-change switch phase-change system is simple in logic, can realize zero-voltage turn off and zero-current conduction, is short in load power off time, low in implement cost, and can effectively solve the distribution network three-phase load rebalance control problem.

Description

Technical field [0001] The invention relates to the field of power transmission, in particular to a commutation system of an intelligent commutation switch. Background technique [0002] China's mountainous area is vast, with many and scattered power users, and there are a large number of unbalanced single-phase loads in time and space, leading to varying degrees of unbalanced three-phase loads in most distribution stations. The impact of three-phase load imbalance on the distribution station area mainly includes four aspects: 1) the increase in the loss of distribution transformers and lines; 2) the quality of the power supply voltage of the heavy load phase in the distribution station area is greatly reduced; 3) the distribution The output of the electric transformer decreases, and the power conversion efficiency decreases; 4) The zero-sequence current of the distribution transformer increases due to the unbalanced operation of the three-phase load, and the eddy current loss ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 张扬刘友仁范瑞祥邓才波刘静杨小品王翠张文华
Owner NANCHANG INST OF TECH
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