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Phase electricity exchange device of three-phase and four-wire power supply load interface, and control method thereof

A load interface, three-phase four-wire technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve the problems of the load interface power supply phase is not easy to change, the phase is easy to change, etc.

Inactive Publication Date: 2018-05-01
ZHEJIANG UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the power supply phase of the load interface of the existing three-phase four-wire power supply is not easy to change, and provides a kind of power supply phase of the load interface of the three-phase four-wire power supply that can be easily changed, and can be carried out according to the unbalanced power factor on the three phases. The power supply phase of the load interface is automatically exchanged, with high safety and good reliability, and the compound switch can be switched at the exact time when the current crosses zero, and the phase switching device and its control of the three-phase four-wire power supply load interface with a high degree of intelligence square

Method used

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  • Phase electricity exchange device of three-phase and four-wire power supply load interface, and control method thereof
  • Phase electricity exchange device of three-phase and four-wire power supply load interface, and control method thereof
  • Phase electricity exchange device of three-phase and four-wire power supply load interface, and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Embodiment 1: Three-phase four-wire power supply load interface phase power exchange device, see figure 1 and Figure 11 As shown, including A phase, B phase, C phase, neutral line N, A connection port, B connection port, C connection port, No. 1 load interface 811, No. 2 load interface 822, No. 3 load interface 833, and controller 107 , node J1, node J2, node J3, node J4, node J5, node J6, node J7 and node J8;

[0089] It also includes a three-phase power factor monitor 101 connected to the controller, a No. 1 phase voltage sampling circuit 102, a No. 1 single-phase inverter power supply 103, a No. 1 filter 104, a No. 1 isolation transformer 105, and a No. 1 load interface voltage Sampling circuit 108, interface power factor monitor 109, No. 2 phase voltage sampling circuit 110, No. 2 single-phase inverter power supply 1030, No. 2 filter 1040, No. 2 isolation transformer 1050, No. 2 load interface voltage sampling circuit 1080, switch K1, switch K2, switch K3, switch...

example 2

[0152] Example 2, the difference with example 1 is:

[0153] see figure 1 , Figure 9 and Figure 10 As shown, the No. 1 load interface 811 is a quick connection port. The quick connection port includes a plug 34 and a housing 39. An insulating tube 31 is fixed upward on the upper surface of the housing. The pressure sensor 32 connected to the controller is fixed with a through hole communicating with the inner cavity 38 of the housing on the upper surface of the housing surrounded by the insulating tube, and a pin 37 is fixed in the through hole, and the lower end of the pin is located in the housing. In the inner cavity of the body, the upper end of the pin is located in the insulating tube; the two ends of a wire 30 are respectively conductively connected to the lower end of the pin and the node J6; the plug includes an insulating insert 36 and a conductive tube arranged in the insulating insert 35; the inner diameter of the insulating cannula matches the outer diameter ...

example 3

[0154] Example 3, the difference with Example 1 is:

[0155] see figure 1 and Figure 11 As shown, it also includes a memory 106, a wireless module 504, an address encoder 507 and a server 200 respectively connected to the controller.

[0156] If there are two three-phase four-wire power supply load interface phase switching devices, then the two three-phase four-wire power supply load interface phase switching devices can connect the two three-phase four-wire power supply load interfaces to each other through their respective wireless modules. The phase electric switching device is connected with each other through wireless signals;

[0157] When only one of the three load interfaces in the first three-phase four-wire power supply load interface is connected to a load, and the second three-phase four-wire power supply load interface When only two of the load interfaces are connected with loads;

[0158] If the load interface of the first three-phase four-wire power supply...

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Abstract

The invention discloses a phase electricity exchange device of a three-phase and four-wire power supply load interface, and a control method thereof. The invention relates to the technical field of the phase electricity selection of the three-phase and four-wire power supply load interface. The load interface power supply phase of the three-phase and four-wire power supply is easy to change, and the automatic exchange of the power supply phase of the load interface can be conducted based on the unbalance of the three-phase upper power factors. The phase and electricity exchange device comprises A phase, B phase, C phase, zero line N, three load interfaces, a controller, a plurality of nodes, and a three-phase power factor monitoring machine, an interface power factor monitoring machine, two phase electricity sampling circuits, two single-phase inversion power supplies, two filters, two isolation transformers, two load interface voltage sampling circuits, and a plurality of switches, with the latter eight being respectively connected to the connector. The change of input phase electricity among each load interface can be controlled through the controller.

Description

technical field [0001] The invention relates to the technical field of phase power selection at an output port of a three-phase four-wire power supply, in particular to a phase power exchange device for a load interface of a three-phase four-wire power supply and a control method thereof. Background technique [0002] With the development of economy and society, there are more and more types of electrical equipment. Since the current power supply system is generally a three-phase power supply system, in the three-phase power supply system, if the power factor on the three phases is relatively asymmetric, the unbalanced operation of the power grid will occur, and the power grid will jitter. [0003] When the power grid is running in an unbalanced state, the transformer in the power grid is in an asymmetric running state. A transformer in an asymmetric running state will cause the zero-sequence current of the transformer to be too large, and the excessive zero-sequence current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/00
CPCH02J3/00H02J3/26Y02E40/50
Inventor 谢楠张海波
Owner ZHEJIANG UNIV OF WATER RESOURCES & ELECTRIC POWER
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