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Generator rotor ground protection method through voltage division by using resistor

A generator rotor, grounding protection technology, applied in the direction of emergency protection circuit devices, emergency protection circuit devices, electrical components, etc. for limiting overcurrent/overvoltage, can solve the problem of inability to correctly distinguish the grounding of the excitation winding lead, personnel, equipment, etc. safety hazards etc.

Active Publication Date: 2013-10-23
NR ENG CO LTD
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  • Description
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problem that the existing ping-pong type and injection type rotor grounding protection of large generator sets, when the full voltage of the rotor voltage is introduced, the excessive voltage will cause hidden dangers to the safety of people and equipment; and the failure to correctly distinguish the excitation winding The grounding of the positive and negative ends and the grounding of the lead wire of the measurement circuit are insufficient.

Method used

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  • Generator rotor ground protection method through voltage division by using resistor
  • Generator rotor ground protection method through voltage division by using resistor
  • Generator rotor ground protection method through voltage division by using resistor

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing, the present invention is further described in detail, and the steps are as follows:

[0042] 1. The specific implementation of the ping-pong rotor grounding protection method using resistance voltage division:

[0043] The equivalent circuit of the ping-pong rotor with a voltage divider by the sampling resistor is as follows: figure 1 shown, where S 1 , S 2 is the electronic switch, R g is the grounding resistance. I 1 , I 2 for S 1 open, s 2 When closed, the corresponding loop flows through the current, I' 1 , I' 2 for S 1 closed, S 2 The current flowing through the corresponding circuit when it is opened are all measured values. u r is the rotor voltage, and divides the divided rotor voltage measured for protection by the extraction ratio, and the definition of the injection type is the same. According to the sampling data, the calculation formula of a point grounding resistance value is:

[0044] ...

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Abstract

The invention relates to a generator rotor ground protection method through voltage division by using resistors. The generator rotor ground protection method comprises a Ping-Pong-type generator rotor ground protection method through voltage division by using resistors and an injection-type generator rotor ground protection method through voltage division by using resistors. The generator rotor ground protection method is characterized in that exciting voltage which is input into a protection screen is reduced, whether a ground fault occurs on the lead of an exciting circuit or the lead of a measuring circuit is correctly judged through switching of different extraction resistors, and theoretical data is provided for troubleshooting of field fault points by calculating the ground resistance and the positions of two positioned points. Aiming at overcoming the defects existing in the traditional Ping-Pong-type and injection-type generator rotor ground protection methods and further improving the traditional Ping-Pong-type and injection-type generator rotor ground protection methods, by reducing the exciting voltage input into the protection screen, the requirement on the measurement accuracy of the ground resistance and the position of one point in the field is met.

Description

technical field [0001] The invention relates to a method for participating in the grounding protection of the generator rotor after the excitation voltage of the unit is divided by a high-power resistor, and belongs to the field of the generator rotor grounding protection. Background technique [0002] With the continuous increase of the unit capacity of the generator, the rotor voltage is getting higher and higher. The excitation voltage of many large-scale generators is 500-600V under normal conditions, while the strong excitation voltage reaches thousands of volts. Directly introducing the excitation voltage into the protection screen will cause serious damage to personnel. , The insulation of the equipment causes potential safety hazards, and at the same time, the requirements for the withstand voltage of the rotor voltage measurement channel are higher. According to the requirements of Article 6.1.2 of GB14285-2006 "Technical Regulations for Relay Protection and Safety ...

Claims

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Application Information

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IPC IPC(8): H02H9/04G01R31/08
Inventor 陈晓明熊良根周荣斌张琦雪施东伟高守义
Owner NR ENG CO LTD
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