Three-phase load anti-phase failure protection circuit

A technology for protecting circuits and three-phase loads, which is applied to emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc., to achieve the effects of simple production, convenient use and fast protection action.

Active Publication Date: 2018-11-06
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it has the advantages of no blind zone for phase failure protection and no influence of power supply voltage imbalance.

Method used

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  • Three-phase load anti-phase failure protection circuit

Examples

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Embodiment 1

[0022] A three-phase load anti-phase failure protection circuit, including a transformer T1, a Y-shaped sampling circuit, a first voltage divider circuit, a short-time delay cut-off circuit, a second voltage divider circuit, a comparison circuit, and a control circuit. The transformer T1 secondary The three output ends on the side are all connected to the Y-type sampling circuit, the neutral output end of the Y-type sampling circuit is grounded through the first voltage divider circuit, and the low-voltage output end of the first voltage divider circuit is connected to The voltage signal noninverting input terminal of the comparison circuit, the low voltage output terminal of the second voltage divider circuit is connected to the voltage signal inversion input terminal of the comparison circuit, and the output terminal of the comparison circuit is connected to the control circuit.

[0023] Further, the Y-shaped sampling circuit is composed of a first resistor R1, a second resis...

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PUM

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Abstract

The invention relates to the technical field of electrical equipment protection, in particular to a three-phase load phase failure protection circuit. The three-phase load phase failure protection circuit comprises a transformer, a Y-shaped sampling circuit, a first partial pressure circuit, a short-time cutoff circuit, a second partial pressure circuit, a comparison circuit and a control circuit; the secondary side of the transformer is connected with the Y-shaped sampling circuit, the neutral point of the Y-shaped sampling circuit is grounded via the first partial pressure circuit, the low-voltage outlet end of the first partial pressure circuit is connected to positive input end of the comparison circuit, the low-voltage output end of the second partial pressure circuit is connected to the negative input end of the comparison circuit, and the output end of the comparison circuit is connected to the control end of the control circuit. The three-phase load phase failure protection circuit reasonable in design, simple in structure and safe and reliable; when a certain one or two phases are in phase loss during operation of three-phase load, a supply circuit of the three-phase load can be cut off timely to enable the load to be separated from a three-phase power supply to stop running, and load equipment is protected.

Description

technical field [0001] The invention relates to the technical field of electrical equipment protection, in particular to a three-phase load anti-phase failure protection circuit. Background technique [0002] At present, three-phase loads such as small and medium-sized three-phase asynchronous motors have the advantages of simple structure, reliable operation, convenient use and maintenance, and their mechanical properties can meet the needs of most mechanical production. It has been widely used in fields such as transportation and urban transportation, and has a significant impact on the national economy, energy conservation and environmental protection, and plays an indispensable and irreplaceable role. However, in the daily life and production process, phase failure often occurs. There are also various reasons for phase failure, such as: loose phase wire bolts, long-term contact with melting points of relay contacts resulting in disconnection, failure of auxiliary contac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/253
CPCH02H3/253
Inventor 莫善奎
Owner GUANGXI UNIV
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