Protective Method for Rotor Grounding of Generator Using Resistive Voltage Divider

A generator rotor and grounding protection technology, which is applied to emergency protection circuit devices, emergency protection circuit devices, electrical components, etc. for limiting overcurrent/overvoltage, and can solve the problem of inability to correctly distinguish grounding of excitation winding leads, personal and equipment Safety hazards and other issues
CN103368162BActive Publication Date: 2016-01-20NR ENG CO LTD
4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
NR ENG CO LTD
Publication Date
2016-01-20

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More