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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: 2008-10-15
李相淮 +1
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  • 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

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  • 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

[0017] Embodiment 1. Feedback control system for any one or several wires of the three-phase power supply to be de-energized, that is, to lose phase

[0018] Such as 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, each two wires are connected to one of the two primary windings of the transformer, The 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; relative to the two phase wires, the secondary winding of the primary high-voltage winding L1 is three identical and mutually independent control lines Winding eA, eB, eC composition. The line voltage of the two phase wires is 380 volts, and the voltage of each of the three control wire windings in the secondary winding is 24 volts. The voltage of the primary low-voltage winding L2 of the phas...

Embodiment 2

[0024] Embodiment 2, system with feedback control to motor fault state

[0025] As shown in Figure 3, on the basis of Embodiment 1, the feedback control system for load failure is added, and its design is as follows:

[0026]A thermal sensor switch is provided on the load motor, the thermal sensor switch is connected to 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 is hot enough to disconnect the three-phase four-wire power supply to the main switch, and the main switch controls the three phase line sub-switches KeA, KeB, KeC to realize overheat protection for the load motor.

Embodiment 3

[0027] Embodiment 3, a system with feedback control of the overpressure state of the pressure gauge

[0028] As shown in Figure 3, on the basis of Embodiment 1, the feedback control system for the overpressure state of the pressure gauge is added, and its design is as follows:

[0029] For equipment that uses a motor to blow air to the boiler, the boiler is equipped with a pressure gauge, and the pressure gauge is equipped with a pressure switch that feels 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 or off. Still off. When the air pressure in the boiler is greater than 3 atmospheres and it is necessary to stop the motor to blow air to the boiler, the pressure switch makes the main switch control the three phase line sub-switches KeA, KeB, KeC, so as to stop the blowing work of the load motor and reduce the pressure of the boiler.

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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 failure protection of three-phase power supply, in particular, when the three-phase power supply or load fails, the fault information is used for feedback control of the three-phase power supply. Background technique [0002] Electrical appliances such as motors and other three-phase power supplies cannot work without a phase. If there is a lack of phase, that is, one or two phase wires are powered off, it is easy to damage electrical appliances such as motors 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. . Contents of the invention [0003] The purpose of the present invention is to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/253H02H7/09
Inventor 李相淮杨荣合
Owner 李相淮
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