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Current transformer disconnection identification method, differential protection method and device for electric reactor

A technology of current transformer and differential protection, applied in emergency protection circuit devices, emergency protection data processing devices, circuit devices, etc., to prevent accidents from expanding, avoid damage, and ensure power supply safety

Active Publication Date: 2018-06-08
XUJI GRP +2
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Problems solved by technology

[0005] The purpose of the present invention is to provide a reactor current transformer disconnection identification method, differential protection method and device, which are used to solve the problem of accurately judging whether the reactor current transformer is disconnected

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  • Current transformer disconnection identification method, differential protection method and device for electric reactor
  • Current transformer disconnection identification method, differential protection method and device for electric reactor
  • Current transformer disconnection identification method, differential protection method and device for electric reactor

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Embodiment Construction

[0070] The specific implementation manner of the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0071] The main wiring diagram of the UHV reactor is as follows: figure 1 As shown, the current transformer and voltage transformer at the head end of the UHV reactor are respectively CT1 and PT, and the current transformer at the tail end of the UHV reactor is CT2. Usually, the label ABC is the first end of the three-phase reactor, and the phases A, B, and C of the first end are connected to the lines A, B, and C respectively; the label XYZ is the tail end of the three-phase reactor, and the three-phase short ends of A, B, and C Connect to ground directly or through a small reactor.

[0072] Below to figure 1 Taking the main wiring of a medium-ultra-high voltage reactor as an example, the method for identifying the disconnection of the current transformer of the reactor and the differential protection method of the p...

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Abstract

The invention relates to a current transformer disconnection identification method, differential protection method and device for an electric reactor. The current transformer disconnection identification method includes judging whether current transformer disconnection judgment start conditions are met or not; if the starting conditions are met, judging whether the following conditions, including(1) the zero sequence current of a home terminal of the electric reactor is not zero and either phase of phase current is zero after disconnection judgment is started; (2) the zero sequence current ofthe other end of the electric reactor is zero and three phases of phase current are all not zero when the disconnection judgment is started; (3) the zero sequence current of the head end of the electric reactor is zero when the disconnection judgment is started, are met or not; determining disconnection of the current transformer for the electric reactor after a set delay time if the above conditions are met. According to the invention, whether disconnection of the current transformer occurs or not is identified according to disconnection and failure features of the current transformer. Besides, the head end voltage of the electric reactor is introduced for auxiliary judgment. Therefore, the disconnection of the current transformer can be judged accurately for the electric reactor and basis is provided for reliable action of differential protection.

Description

technical field [0001] The invention relates to a reactor current transformer disconnection identification method, a differential protection method and a device, and belongs to the technical field of electric power system relay protection. Background technique [0002] "Electrical Industry Safety Work Regulations" stipulates that it is strictly forbidden to open the circuit when the secondary circuit of the live current transformer is working. The current transformer used in UHV equipment has a large number of secondary winding turns and a high open circuit voltage. Such a high secondary voltage may not only damage the insulation of the secondary winding and secondary equipment, but also burn the iron core due to overheating, and even threaten personal safety. Therefore, the current regulations and countermeasures require that the current mutual inductance of UHV reactors In the event of disconnection, non-blocking differential protection is usually recommended. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04H02H1/00
CPCH02H1/0092H02H7/042
Inventor 邓茂军樊占峰姚武倪传坤金全仁余高旺马和科王智勇姚东晓陈继瑞唐宇
Owner XUJI GRP
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