Reactor current transformer disconnection identification method, differential protection method and device

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

Active Publication Date: 2019-05-14
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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  • Reactor current transformer disconnection identification method, differential protection method and device
  • Reactor current transformer disconnection identification method, differential protection method and device
  • Reactor current transformer disconnection identification method, differential protection method and device

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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 method for identifying disconnection of a reactor current transformer, a differential protection method and a device. The method for identifying a disconnection of a current transformer includes: judging whether the start-up condition for the disconnection of the current transformer is met; if the start-up condition is met, Judging whether the following conditions are met: (1) The zero-sequence current at the end of the reactor is not zero and the phase current of any phase is zero after the disconnection discrimination starts; (2) The zero-sequence current at the other end of the reactor when the disconnection discrimination starts (3) The zero-sequence voltage at the head end of the reactor is zero when the disconnection is judged and started; if the above conditions are met, after the set delay time, the reactor current mutual inductance is judged disconnected. The present invention identifies whether the current transformer is disconnected or not according to the characteristics of the disconnection and fault of the current transformer, and additionally introduces the voltage at the head end of the reactor for auxiliary judgment, so that it can accurately determine whether the current transformer of the reactor is disconnected, which is the key to differential protection. Provide a basis for reliable action.

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...

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Application Information

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Patent Type & Authority Patents(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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