A High Voltage Fast Phase Change Switch

A commutation switch, high-voltage technology, applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc., can solve the problems of increasing line loss, generating large inrush current, reducing power supply reliability, etc., and achieving Reduce the switching time, reduce the pull-in time, and ensure the effect of timeliness

Active Publication Date: 2021-08-24
浙江九社电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-phase imbalance will lead to the unbalance of the three-phase voltage and current of the power supply system, causing the negative sequence voltage and negative sequence current of the power grid, affecting the quality of power supply, thereby increasing line loss and reducing the reliability of power supply
[0003] In order to ensure the relative balance of the three-phase power, the use of a commutation switch is one of the most commonly used means, and the existing commutation switch, the switching time between the three-phase AC is relatively long, about 13ms or more, and the switching time will be long Cause the commutation switch to heat up, and generate a large inrush current at the moment of load switching, which is not conducive to the safe operation of the circuit

Method used

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  • A High Voltage Fast Phase Change Switch
  • A High Voltage Fast Phase Change Switch
  • A High Voltage Fast Phase Change Switch

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0033] A kind of high-voltage fast commutation switch of the present invention, such as figure 1 As shown, it includes four independent DC power supplies, detection circuits, drive circuits, and control circuits. The detection circuit is used to detect the state of AC power and output detection signals. The control circuit is used to output control signals according to the detection signals. The drive circuit is used for all The state of the commutation switch is switched by the control signal, the control circuit is connected with the detection circuit and the drive circuit, and the three independent DC power sources are used for the drive circuit to release energy without affecting each other. The fourth DC power supply is used to supply power to the control circuit and the detection circuit.

[0034] The control circuit includes an MCU and a register. The register is a serial-in-parallel-out register, which is used to convert the serial control signal output by the MCU into...

specific Embodiment approach 2

[0053] The connection relationship of the commutation switch in the three-phase alternating current is as follows: figure 2 As shown, the main switch JK1 of the commutation switch is used for on-off control of the three-phase alternating current, and the auxiliary switches JK2 and JK3 are used for selecting one phase of the three-phase alternating current to be turned on.

[0054] The two switch terminals of the auxiliary switch JK3 are respectively connected to the A-phase and B-phase AC input terminals, and its common terminal is connected to one switch terminal of the auxiliary switch JK2, and the other switch terminal of the auxiliary switch JK2 is connected to the C-phase AC input terminal, and the auxiliary switch JK2 The common end of the main switch JK1 is connected to one switch end of the main switch JK1, the other switch end of the main switch JK1 is suspended, and the common end of the main switch JK1 is connected to the input end of the main circuit.

[0055] The...

specific Embodiment approach 3

[0073] The control circuit is connected to the output terminal of the detection circuit, such as Figure 5 As shown, the detection circuit includes a zero-crossing detection circuit and a state detection circuit; the zero-crossing detection circuit includes three zero-crossing detection sub-circuits, which are respectively used to detect the zero-crossing point of each phase of alternating current.

[0074] In this embodiment, the three zero-crossing detection sub-circuits have the same structure, such as Figure 6 shown.

[0075] Including optocoupler G4 for isolation of AC and DC power.

[0076] One input end of the control side of the optocoupler G4 is connected to the A-phase alternating current through the resistor R3, and its output end is connected to the neutral line through the resistor R4. An output terminal on the output side of the optocoupler G4 is connected to the base of the triode Q2, connected to the power supply terminal AVCC of the fourth DC power supply t...

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Abstract

The invention discloses a high-voltage fast phase-change switch, which comprises at least three mutually independent DC power supplies, a detection circuit, a drive circuit, and a control circuit. The detection circuit is used to detect the state of alternating current and output a detection signal. The control circuit It is used to output a control signal according to the detection signal, the driving circuit is used to switch the state of the phase change switch according to the control signal, the control circuit is connected to the detection circuit and the driving circuit, and three independent The DC power supply does not affect each other when the drive circuit releases energy, and the control circuit is used to control the drive circuit to complete switching within half a cycle, and a voltage 10 times greater than the stable voltage of the relay is applied to the drive circuit to reduce the operating time of the drive circuit. The fast switching of the commutation switch is realized.

Description

technical field [0001] The invention relates to the technical field of phase change switches, in particular to a high-voltage fast phase change switch. Background technique [0002] my country's low-voltage distribution network has a wide range of points and a complex structure. With the continuous improvement of people's living standards, the nature of the load is becoming more and more diverse, and the load fluctuation is becoming more and more significant, which makes the problem of three-phase imbalance in the low-voltage station area more prominent. The three-phase imbalance will lead to the unbalance of three-phase voltage and current in the power supply system, causing negative sequence voltage and negative sequence current of the power grid, affecting the quality of power supply, thereby increasing line loss and reducing power supply reliability. [0003] In order to ensure the relative balance of the three-phase power, the use of a commutation switch is one of the m...

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 郑强朱超施倩倩郑克黄俊郑东郑静朱光
Owner 浙江九社电气有限公司
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