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Three-phase power grid phase loss detection method and circuit

A three-phase power grid and phase loss detection technology, applied in the field of power electronics, can solve the problems of serious heat generation, inability to judge, and low circuit reliability.

Active Publication Date: 2013-07-10
INVT POWER ELECTRONICS SUZHOU CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the loss of the current-limiting resistors R1, R2, and R3 of the above-mentioned phase loss detection circuit is relatively large when the grid voltage is normal, the heat is serious, and the reliability of the circuit is not high. One phase missing

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  • Three-phase power grid phase loss detection method and circuit

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Embodiment Construction

[0055]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0056] The embodiment of the invention discloses a phase loss detection method of a three-phase power grid, which can effectively determine which phase of the power grid is missing according to the relationship between the voltage values ​​of the power grid between phases.

[0057] Such as figure 2 As shown, a three-phase power grid phase loss detection method, including:

[0058] S101. Obtain the first line voltage and the second line voltage on the...

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Abstract

The invention discloses a three-phase power grid phase loss detection method and a circuit. The three-phase power grid phase loss detection method comprises the following steps: obtaining a first line voltage and a second line voltage of a power grid side through a voltage transformer; calculating a third line voltage according to the first line voltage and the second line voltage obtained through the voltage transformer through a processor; and judging three-phase power grid phase loss according to the magnitude relation of the first line voltage, the second line voltage and the third line voltage through the processor. The invention further discloses the three-phase power grid phase loss detection circuit. Due to the fact that the voltage of the power grid side is obtained through the voltage transformer, the problems that current-limiting resistance loss is large, heating is serious, circuit reliability is low and the like in an existing detection circuit can be solved. Meanwhile, due to the fact that the processor is adopted for calculating line voltages and judging according to the magnitude of the line voltages, specific phase loss conditions of a three-phase power grid can be judged.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a three-phase power grid phase loss detection method and circuit. Background technique [0002] For the current SVG, frequency converter and other products, if no protection is performed when the power input phase is missing, the product or load equipment may be damaged. However, if the power grid management products such as SVG are not protected when the phase is missing, there will be even more damage. It may make the compensation out of control, inject a large amount of unnecessary reactive power and harmonics, and cause damage to other equipment in the grid. Therefore, for this type of product, input phase loss detection is very necessary. [0003] The traditional phase loss detection circuit such as figure 1 As shown, it is attenuated by resistors R1, R2, and R3. After full-wave rectification by diodes D1, D2, and D3, it is filtered with resistor R4 and ...

Claims

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Application Information

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IPC IPC(8): G01R29/16
Inventor 凡念
Owner INVT POWER ELECTRONICS SUZHOU CO LTD
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