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Motor protection method

A technology for electric motors and protection devices, which is applied in the direction of emergency protection circuit devices and electrical components, can solve the problems of quick movement and reliability reduction of differential protection, and achieve improved anti-misoperation ability, obvious effect, and reduction of unbalanced current. small effect

Inactive Publication Date: 2018-11-23
南通同德电气设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a motor protection method, which solves the problem that the current differential protection of one motor or multiple motors reduces the quickness and reliability of the differential protection due to the excessive length of the neutral point CT secondary cable

Method used

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Embodiment Construction

[0016] The following will be described in detail in combination with embodiments of the present invention.

[0017] The present invention provides a motor protection method to overcome the above existing problems.

[0018] A motor protection method, including one or more motors, and motor protection devices corresponding to the motors; including one or more neutral point current collection devices, and each neutral point current collection device is connected with one or more Multiple motors are connected, and the motor protection device and the neutral point current collection device are connected by communication; the neutral point current collection device is used to collect the neutral point current of the motor and convert it into a digital The signal is transmitted to the motor protection device through communication; the motor protection device is used to collect the motor terminal side current, and according to the signal transmitted by the neutral point current collec...

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PUM

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Abstract

The invention discloses a motor protection method. Motor protection devices and neutral point current acquisition devices which correspond to one or more motors are included; and the neural point current acquisition devices convert neural point currents of the one or more motors into digital signals and transmit the various current signals to the corresponding motor protection devices in a communication mode, and the motor protection devices acquire currents of the respective motors, conduct synchronous processing by combining the signals transmitted by the neural point current acquisition devices and then complete the differential protection function. According to the system and method, the CT saturation problem caused by the fact that the neural point current acquisition cable is too long can be solved, the differential protection performance and the external fault maloperation prevention capacity can be improved, the signal reliability is enhanced, field wiring is simplified, and the investment is reduced.

Description

technical field [0001] The invention relates to motor relay protection, in particular to a motor protection method. Background technique [0002] In power plants and industrial enterprises, motors are essential equipment to ensure the normal operation of the process. For motors with a capacity of 2000kW and above, differential protection is required. [0003] The operation and stop of large motors are controlled by circuit breakers. In power plants and industrial enterprises, all the circuit breaker cabinets of a section of bus are arranged in the switch room, and the motors are arranged in different places according to the requirements of the process. The distance from the circuit breaker cabinet is several Ten meters to thousands of meters. [0004] In general, the motor protection device is installed on the circuit breaker cabinet, and the bus voltage, motor terminal current, and circuit breaker position required by the protection device can be collected from the circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08
CPCH02H7/08
Inventor 徐学明
Owner 南通同德电气设备有限公司