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Three-phase four-wire zero-missing detection circuit and method

A detection circuit, three-phase four-wire technology, applied in the direction of measuring electricity, measuring electrical variables, multi-phase network asymmetry measurement, etc., can solve problems such as damage to electrical equipment, unbalanced three-phase voltage, voltage failure, etc., to achieve The effect of improving efficiency

Pending Publication Date: 2020-11-17
杭州鸣扬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the current international and domestic three-phase four-wire power supply systems, due to the existence of the neutral line (that is, the neutral point of the distribution transformer is well grounded), the three-phase voltage remains stable and balanced, and does not occur with the imbalance of the three-phase load. Neutral point displacement, the neutral line and the three-phase lines A, B, and C constitute an effective whole. When the neutral line is connected intact, even if any one of the three phases A, B, and C is disconnected, the other two phases will be disconnected. The load can still work under normal voltage conditions. If the neutral line is disconnected, even if the three-phase load is balanced, as long as the load is not synchronized, the neutral point displacement phenomenon will occur, not to mention the three-phase voltage caused by unbalanced load. Unbalanced, indirectly makes the loads of each phase not work due to unstable voltage and even damages the electrical equipment

Method used

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  • Three-phase four-wire zero-missing detection circuit and method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0018] Such as figure 1 As shown, a three-phase four-wire zero-missing detection circuit includes interface J1, transformer T1, transformer T2, transformer T3, rectifier bridge U1, rectifier bridge U3, rectifier bridge U4, voltage regulator tube VR1, voltage regulator tube VR2, voltage regulator tube VR3, diode D2, diode D4, diode D5, diode D6, optocoupler U2, resistor R1, resistor R2 and capacitor C1, transformer T1 is connected to pin 1 and pin 2 of rectifier bridge U1, and diode D2 is connected to For capacitor C1, transformer T2 is connected to pin 1 and pin 2 of rectifier bridge U3, transformer T3 is connected to pin 1 and pin 2 of rectifier bridge U4, resistor R1 is connected to power supply VCC, and resistor R2 is connected to optocoupler U2.

[0019] Pin 3 of the rectifier bridge U1, pin 3 of the rectifier bridge U3 and pin 3 of the rectifier bridge U4 are all connected to the diode D2.

[0020] The voltage regulator tube VR1, the voltage regulator tube VR2 and the vo...

Embodiment 2

[0025] A three-phase four-wire zero-missing detection method, comprising the following steps:

[0026] Step 1: First, the A-phase current flows through the transformer T1 to generate an induced current, and the induced current converts the AC current into a DC current through the rectifier bridge U1, and the DC current is sent to the capacitor C1 through the diode D2 to generate a stable DC voltage, and the DC voltage passes through The voltage regulator VR1 generates a stable voltage, and another part of the current flows into the neutral line through the diode D4, and then the neutral line passes through the diode D6, and the voltage drop of the diode D5 flows into the A phase;

[0027] Step 2: The B-phase current flows through the transformer T2 to generate an induced current, and the induced current converts the AC current into a DC current through the rectifier bridge U3, and the DC current is sent to the capacitor C1 through the diode D2 to generate a stable DC voltage, a...

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Abstract

The invention discloses a three-phase four-wire zero-missing detection circuit which comprises an interface J1, a mutual inductor T1, a mutual inductor T2, a mutual inductor T3, a rectifier bridge U1,a rectifier bridge U3, a rectifier bridge U4, a voltage-regulator tube VR1, a voltage-regulator tube VR2, a voltage-regulator tube VR3, a diode D2, a diode D4, a diode D5, a diode D6, an optocouplerU2, a resistor R1, a resistor R2 and a capacitor C1, wherein the mutual inductor T1 is connected with a pin 1 and a pin 2 of the rectifier bridge U1, and the diode D2 is connected with the capacitor C1. The mutual inductor T2 is connected with a pin 1 and a pin 2 of the rectifier bridge U3, the mutual inductor T3 is connected with a pin 1 and a pin 2 of the rectifier bridge U4, the resistor R1 isconnected with a power supply VCC, and the resistor R2 is connected with the optocoupler U2. Through application of the three-phase four-wire zero-missing detection circuit, zero-missing detection efficiency is greatly improved. The three-phase four-wire zero-missing detection circuit has certain use value and popularization value.

Description

technical field [0001] The invention relates to the technical field of zero-missing detection circuits, in particular to a three-phase four-wire zero-missing detection circuit and a method thereof. Background technique [0002] In the current international and domestic three-phase four-wire power supply systems, due to the existence of the neutral line (that is, the neutral point of the distribution transformer is well grounded), the three-phase voltage remains stable and balanced, and does not occur with the imbalance of the three-phase load. Neutral point displacement, the neutral line and the three-phase lines A, B, and C constitute an effective whole. When the neutral line is connected intact, even if any one of the three phases A, B, and C is disconnected, the other two phases will be disconnected. The load can still work under normal voltage conditions. If the neutral line is disconnected, even if the three-phase load is balanced, as long as the load is not synchronize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54G01R31/58G01R29/16G01R1/30
CPCG01R1/30G01R29/16G01R31/54G01R31/58
Inventor 吴生思张丽黄慧敏王健林
Owner 杭州鸣扬科技有限公司