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Three-phase four-wire power supply load interface phase switching device and control method thereof

A load interface, three-phase four-wire technology, used 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., to improve stability, reliability, safety High performance and reliability

Inactive Publication Date: 2021-05-04
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 performed 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 reliability, and the compound switch can be switched at the exact time when the current crosses zero, and the phase switching device and control of the three-phase four-wire power supply load interface with a high degree of intelligence method

Method used

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  • Three-phase four-wire power supply load interface phase switching device and control method thereof
  • Three-phase four-wire power supply load interface phase switching device and control method thereof
  • Three-phase four-wire power supply load interface phase switching device and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088]Example 1: Three-phase four-wire power supply load interface phase-electric exchange device, seefigure 1 withFigure 11 As shown, including a phase, B phase, C phase, zero line N, A terminal port, B wiring port, C wiring port, No. 1 load interface 811, II load interface 822, II load interface 833, controller 107 , Node J1, node J2, node J3, node J4, node J5, node J6, node J7, and node J8;

[0089]Also included, the three-phase power factor monitor 101, a single phase voltage sampling circuit 102, a single-phase inverter power source 103, No. 1 filter 104, No. 1 isolation transformer 105, one load interface voltage, respectively. Sampling circuit 108, the interface power factor monitor 109, the second phase voltage sampling circuit 110, the second single phase inverter power source 1030, the second filter 1040, the second isolation transformer 1050, the second load interface voltage sampling circuit 1080, switch K1, switch k2, switch k3, switch k4, switch k5, switch k6, switch k7, ...

example 2

[0152]Example 2, the difference from Example 1 is:

[0153]Seefigure 1 Figure 9 withFigure 10 As shown, the 1nd load interface 811 is a quick connection opening, and the quick connection opening includes a plug 34 and a housing 39, and the insulating tube 31 is provided upward on the upper surface of the housing, and there is an outer tube wall of the insulator. The pressure sensor 32 connected to the controller is fixed to the through hole in which the inner cavity 38 of the housing is fixed on the upper surface of the housing surrounded by the insulator, and the pin 37 is fixed in the through hole, and the lower end of the pin is located in the shell. In the inner cavity of the body, the upper end of the pin is located in the insulator; both ends of a wire 30 are electrically connected to the lower end and node J6 of the pin, including the insulating intubation 36 and a conductive tube disposed within the insulated intubation 35; the inner diameter of the insulating cannula is matche...

example 3

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

[0155]Seefigure 1 withFigure 11 The memory 106, a wireless module 504, an address encoder 507, and a server 200 are connected to the controller, respectively.

[0156]If the three-phase four-wire power supply load interface is two, the two three-phase four-wire power supply load interface phase-electric power exchange device can connect the two three-phase four-wire power supply load interface through the respective wireless modules. The electrical circuit switch is connected to each other;

[0157]When only one of the three load interfaces in the first three-phase four-wire power load interface phase-in-electric exchange device is connected, the second three-phase four-wire power supply load interface phase-electric exchange device Only two load interfaces are connected in the load interface;

[0158]If this load interface of the first three-phase four-wire power supply load interface phase-electric switching device is determined by the A ph...

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Abstract

The invention discloses a three-phase four-wire power supply load interface phase power exchange device and a control method thereof. It relates to the technical field of phase selection of three-phase four-wire power supply output port, which can easily change the power supply phase of the load interface of the three-phase four-wire power supply, and can automatically exchange the power supply phase of the load interface according to the unbalanced power factor on the three phases, including A phase , Phase B, Phase C, neutral line N, three load interfaces, controller and several nodes, and three-phase power factor monitors connected to the controller respectively, interface power factor monitors, two phase voltage sampling circuits, two A single-phase inverter power supply, two filters, two isolation transformers, two load interface voltage sampling circuits and several switches; the change of the input phase power between each load interface is realized through the control of the controller.

Description

Technical field[0001]The present invention relates to the field of three-phase four-wire power supply output port, and more particularly to the three-phase four-wire power supply load interface electrical power exchange device and its control method thereof.Background technique[0002]With the development of economic society, there is more and more types of electricity equipment. Since the current power supply system is generally three-phase power supply system, in the three-phase power supply system, if there is a large asymmetry in three-phase power factors, the unbalanced operation of the grid will appear.[0003]When the grid is running in an unbalanced state, the transformer in the grid is in an asymmetric operating state, and the transformer in an asymmetric operating state will make the zero sequence current of the transformer excessively, and excessive zero sequence current will cause local part of the transformer. Increased, if the local part temperature of the transformer is t...

Claims

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Application Information

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Patent Type & Authority Patents(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