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A motor differential protection system and method

A technology of differential protection and electric motors, which is applied in the direction of emergency protection circuit devices and electrical components, etc., can solve the problems of quick action and reliability reduction of differential protection, improve the anti-misoperation ability, reduce unbalanced current, The effect of lowering the start-up current threshold

Active Publication Date: 2018-03-13
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a motor differential protection system and method to solve the problem of quick action and reliability of the differential protection of one motor or multiple motors due to the excessive length of the neutral point CT secondary cable Lowering the problem

Method used

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  • A motor differential protection system and method
  • A motor differential protection system and method
  • A motor differential protection system and method

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Embodiment Construction

[0028] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] The invention provides a motor differential protection system, which is aimed at a motor that needs to be equipped with differential protection. Cooperate figure 2 As shown, the number of motor protection devices and circuit breakers is the same and corresponds to each other. Each motor protection device is installed in the circuit breaker cabinet of the corresponding circuit breaker, and the voltage collection of the circuit breaker and the terminal current of the motor are completed through cables. Acquisition, acquisition of signals such as the position of the circuit breaker and control of the circuit breaker; the neutral point current of the motor used for differential protection is connected to the current acquisition device from the neutral point current transformer through the cable, and the current acquisition device converts the neutr...

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Abstract

The invention discloses a motor differential protection system and method, including a motor protection device and a neutral point current acquisition device corresponding to one or more motors; The neutral point current is converted into a digital signal, and each group of current signals is transmitted to the corresponding motor protection device through communication. The motor protection device collects the end-side current of each motor, and combines the signal transmitted by the neutral point current collection device for synchronization. After processing, the differential protection function is completed. This system and method can solve the problem of CT saturation caused by too long neutral-point current acquisition cables, improve differential protection performance and anti-misoperation ability for external faults, enhance signal reliability, simplify on-site wiring, and save investment.

Description

technical field [0001] The present invention relates to motor relay protection, in particular to a motor differential protection system and method that combines the collection of neutral point current signals based on communication and the collection of machine end-side currents through traditional methods. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
Inventor 侯炜石勇张灵凌陈俊沈全荣王文龙张琦雪
Owner NR ELECTRIC CO LTD
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