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Load interface power supply phase automatic exchange device and control method thereof

A load interface, automatic exchange technology, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc., can solve the problems of easy change of phase and difficult change of the power supply phase of the load interface.

Inactive Publication Date: 2021-02-05
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 reliability, and can intelligently and automatically detect the switching fault of the compound switch itself. The highly intelligent automatic exchange device for the power supply phase of the load interface and its control method

Method used

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  • Load interface power supply phase automatic exchange device and control method thereof
  • Load interface power supply phase automatic exchange device and control method thereof
  • Load interface power supply phase automatic exchange device and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085]Embodiment 1: Load interface power supply phase automatic exchange device, seefigure 1 withPicture 11 As shown, including phase A, phase B, phase C, neutral N, A connection port, B connection port, C connection port, No. 1 load port 811, No. 2 load port 822, No. 3 load port 833, and controller 107 , Node J1, node J2, node J3, node J4, node J5, node J6, node J7, and node J8;

[0086]It also includes a three-phase power factor monitor 101, a phase 1 voltage sampling circuit 102, a single-phase inverter 103, a filter 104, an isolation transformer 105, and a load interface voltage connected to the controller. Sampling circuit 108, interface power factor monitor 109, second phase voltage sampling circuit 110, second single-phase inverter power supply 1030, second filter 1040, second isolation transformer 1050, second load interface voltage sampling circuit 1080, switch K1, switch K2, switch K3, switch K4, switch K5, switch K6, switch K7, switch K8, switch K9, switch K10, switch K11, s...

example 2

[0148]Example 2, the difference from Example 1 is:

[0149]Seefigure 1 ,Picture 9 withPicture 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, and the outer tube wall of the insulating tube is provided with 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 cannula 36 and a conductive tube arranged in the insulating cannula 35; The inner diameter of t...

example 3

[0151]Example 3, the difference from Example 1 is:

[0152]Seefigure 1 withPicture 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.

[0153]If there are two load interface power supply phase automatic switching devices, the two load interface power supply phase automatic switching devices can connect the two load interface power supply phase automatic switching devices with each other through their respective wireless modules;

[0154]When only one of the three load interfaces in the power supply phase automatic switching device of the first load interface has a load connected to it, and the second load interface has only two of the three load interfaces in the power supply phase automatic switching device When there is a load connected to the interface;

[0155]If the load interface of the first load interface power supply phase automatic switching device is determined to be powered by phase A, ...

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Abstract

The invention discloses an automatic exchange device of load interface power supply phase, and a control method thereof. The invention relates to the technical field of phase and electricity selectionof three-phase and four-wire power supply outlet. The power supply phase of the load interface of the three-phase and four-wire power supply can be easily changed, and the automatic change of the load interface power supply phase can be conducted based on the imbalance of the three-phase upper power factors. The automatic exchange device of load interface power supply phase comprises A phase, B phase, C phase, a zero line N, three load interfaces, a controller, a plurality of nodes, three-phase power factor monitoring devices which are respectively connected to the controller, an interface power factor monitoring device, two phase voltage sampling circuits, two single-phase inversion power supplies, two filters, two isolation transformers, two load interface voltage sampling circuits, anda plurality of switches. Through the control of the controller, the change of input phase electricity among various load interfaces can be realized.

Description

Technical field[0001]The invention relates to the technical field of three-phase four-wire power output phase power selection, in particular to a load interface power supply phase automatic exchange device and a control method thereof.Background technique[0002]With the development of economy and society, there are more and more types of electrical devices. Since the current power supply system is generally a three-phase power supply system, in a three-phase power supply system, if the power factors on the three phases appear large asymmetry, unbalanced operation of the power grid will occur, and grid jitter will occur.[0003]When the power grid is operating in an unbalanced state, the transformers in the power grid are in asymmetrical operating state. A transformer in asymmetrical operating state will cause excessive zero sequence current of the transformer, and excessive zero sequence current will cause the temperature of local parts of the transformer If the temperature of some par...

Claims

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Application Information

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