Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-phase load anti-phase failure protection circuit

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/253
CPCH02H3/253
Inventor 莫善奎
Owner GUANGXI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com