Check patentability & draft patents in minutes with Patsnap Eureka AI!

Control system of feedback protection for faults of three phase power supply and load

A three-phase power supply, protection control technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc. The effect of damage to the load and prevention of damage

Inactive Publication Date: 2007-05-09
李相淮 +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Motors and other three-phase power appliances cannot work without a phase. If there is a phase loss, one or two phase wires are cut off, it is easy to damage the motor and other appliances or loads.
Now when there is a phase loss in the three-phase power supply, the user immediately disconnects all the wires of the three-phase power supply after discovering the lack of phase, but the load such as the motor is not in a normal working state during the period when the person does not find the phase loss, and even damages the load such as the motor.

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
  • Control system of feedback protection for faults of three phase power supply and load
  • Control system of feedback protection for faults of three phase power supply and load
  • Control system of feedback protection for faults of three phase power supply and load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1. A feedback control system for any one or several lines of the three-phase power supply that is missing phase when power is off

[0017] As shown in Figure 1, the three-phase four-wire power supply is arbitrarily divided into two groups of wires, each group has only two wires in the three-phase four-wire power supply, and each two wires are connected to one of the two primary windings of the transformer. , The two phase wires form the primary high-voltage winding L1 of the transformer, and one phase and one ground wire form the primary low-voltage winding L2 of the transformer; compared to the two phase wires, the three secondary windings of the primary high-voltage winding L1 are identical and independent of each other. The control wire winding eA, eB, eC. The phase voltage of the two phase wires is 380V, and the voltage of each of the three control wire windings in the secondary winding is 24V. The voltage of the primary low-voltage winding L2 of the phase gr...

Embodiment 2

[0023] Embodiment 2. System with feedback control of motor fault state

[0024] As shown in Figure 3, on the basis of embodiment 1, a feedback control system for load failure is added, and its design is as follows:

[0025] A thermal sensor switch is arranged on the load motor, the thermal sensor switch is connected with the main switch, and the thermal sensor switch determines whether the main switch is on or off. The sensor switch transmits the information that the load motor heats up to the need to disconnect the three-phase four-wire power supply to the main switch. The main switch controls the three phase-line sub-switches KeA, KeB, and KeC to realize the overheat protection of the load motor.

Embodiment 3

[0026] Embodiment 3, a system with feedback control on the overpressure state of the pressure gauge

[0027] As shown in Figure 3, on the basis of Example 1, a feedback control system for the overpressure state of the pressure gauge is added. The design is as follows:

[0028] For equipment that uses a motor to blow air to the boiler, there is a pressure gauge on the boiler. The pressure gauge is equipped with a pressure switch for sensing pressure at all positions greater than 3 atmospheres. The pressure switch is connected to the main switch, and the pressure switch determines whether the main switch is on. It's still off. When the air pressure in the boiler is greater than 3 atmospheres and the motor needs to stop blowing to the boiler, the pressure switch enables the main switch to control the three phase line switches KeA, KeB, and KeC to achieve the stop of the load motor and reduce the boiler air pressure.

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 solves issues to prevent load damage when three-phase power supply is lack of phases as well as to request power cut protection of three-phase power supply when malfunction occurs on load. Using transformer to obtain powerdown information of any one or more wires in three-phase four-wire power supply, the invention obtains information of lack of phases in three-phase four-wire power supply. The invention considers multiform powerdown information of any one or more wires as combined switch information. The invention carries out unitive switch control for three-phase four-wire power supply connected to loads. That is to say the power supply connected to loads includes two states: complete on or off. Determining whether three-phase power supply is in fault state: loss of phase or lack of phase, the invention makes action of disconnecting all wires in protectionability so as to prevent load on three phases power supply from damaging.

Description

Technical field [0001] The invention belongs to the technical field of power-off protection of three-phase power supplies, especially when the three-phase power supply or load fails, the fault information is used to perform feedback control on the three-phase power supply. Background technique [0002] Electrical appliances for three-phase power supplies such as motors cannot work under phase loss. If one or two phase wires are cut off due to phase loss, it is easy to damage electrical appliances or loads such as motors. Now when there is a lack of phase in the three-phase power supply, the employer immediately disconnects all the wires of the three-phase power supply after finding the lack of phase, but people do not find that the load such as the motor is in an abnormal working state during the lack of phase, or even the load such as the motor is damaged. . Summary of the invention [0003] The purpose of the present invent...

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 Applications(China)
IPC IPC(8): H02H3/253H02H7/09
Inventor 李相淮杨荣合
Owner 李相淮
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com