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A phase sequence angle detection circuit

A technology for detecting circuits and included angles, which is applied in the directions of testing circuits, measuring electricity, and measuring electrical variables. The effect of interference ability

Active Publication Date: 2017-06-20
SCHNEIDER WINGOAL TIANJIN ELECTRIC EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the vast majority of power supply phase sequence detection devices can only detect the positive and negative of the power supply phase sequence, but cannot detect the change of the phase sequence angle, so the above problems cannot be perfectly solved

Method used

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  • A phase sequence angle detection circuit
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Embodiment Construction

[0019] The phase sequence angle detection circuit provided by the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0020] Such as figure 1 As shown, the phase sequence angle detection circuit provided by the present invention includes: four resistors R1-R4, three diodes D1-D3 and two photocouplers U1, U2; the power supplies V1, V2, and V3 are the main power supplies A, B, C phase power supply;

[0021] The phase A power supply V1 of the main power supply is sequentially connected to the first pin of the first photocoupler U1 through the first diode D1 and the first resistor R1; the phase B power supply V2 of the main power supply is sequentially connected through the second diode The tube D2 and the second resistor R2 are connected to the first pin of the second photocoupler U2; the main power supply C-phase power supply V3 passes through the third diode D3, the third resistor R3 and the first photocoupler U1 in tu...

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Abstract

A phase sequence included angle detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, a diode D3, a photocoupler U1 and a photocoupler U2. The phase sequence included angle detection circuit has the advantages that fewer devices are used, the high anti-interference capacity is achieved, and reliability of a whole system is improved; a periphery device is composed of the resistors and the diodes, the complexity is low, and the machinability of the production is improved; the 5000 Vrms isolation characteristic is achieved, and the strong and weak electricity isolation can be achieved; the pure hardware sampling system is obtained, no software algorithm supports are needed, and the use difficulty is lowered; the phase sequence included angle detection circuit can serve as a power grid open phase judgment device; the phase sequence included angle detection circuit can directly tolerate the megohm meter insulation measurement in the insulation and voltage resistance testing experiment process.

Description

technical field [0001] The invention belongs to the technical field of electrical signal measurement, in particular to a phase sequence angle detection circuit. Background technique [0002] In the power distribution system, there are a large number of three-phase motor loads, which rely on the periodic changes of the three-phase AC power supply to generate a constant magnetic field, which is used to convert the electrical energy on the stator side of the motor into mechanical energy on the rotor side. [0003] However, if the phase sequence of the three-phase power supply is abnormal, the energy transmission of the motor will be unbalanced, and the energy efficiency will be low, and the motor will reverse, causing major production accidents. [0004] To sum up, it is necessary to detect the phase sequence parameters of the power supply. At present, the vast majority of power supply phase sequence detection devices can only detect the positive and negative phase sequence of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/18G01R31/02G01R31/14
Inventor 刘琦谢勇陈锡良任婧周慧梁亚娜朱俊彦
Owner SCHNEIDER WINGOAL TIANJIN ELECTRIC EQUIP
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