Resistance-grounded system

A technology of resistance grounding and resistance, which is applied in the field of electricity, can solve problems such as equipment insulation breakdown, three-phase imbalance, and life safety hazards

Inactive Publication Date: 2009-03-04
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The disadvantage of the neutral point resistance grounding system is: before the grounding fault is eliminated, the potential around the grounding fault is increased. If timely tripping measures are not adopted, it will cause insulation breakdown of the equipment and endanger people's lives; For intermittent ground

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  • Resistance-grounded system

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Embodiment Construction

[0009] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0010] One end of the neutral point isolating switch 1 is connected to one end of the neutral point current transformer 2, the other end of the neutral point isolating switch 1 is connected to one end of the power transformer 5, and the other end of the neutral point current transformer 2 is connected to the openable and closeable One end of the disconnecting thyristor 3 is connected, the other end of the thyristor 3 that can be turned off is connected to the neutral point grounding resistor 4, the other end of the power transformer 5 is connected to the voltage transformer 7, and the two ends of the secondary open triangle of the voltage transformer 7 are connected to the neutral point Thyristor off control relay 6 is connected.

[0011] The power transformer 5 can convert 110~35kV to 10~3kV, the neutral point thyristor break control relay 6 has ...

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Abstract

The invention belongs to the technical field of electricity, discloses a resistance grounding system, and particularly relates to an automatic control resistance grounding system. One end of a neutral-point isolating switch is connected with one end of a neutral-point current transformer, the other end of the neutral-point isolating switch is connected with one end of a power transformer, the other end of the neutral-point current transformer is connected with one end of a thyristor which can be opened and closed, the other end of the thyristor which can be closed is connected with a neutral-point grounding resistance, the other end of the power transformer is connected with a voltage transformer, and two triangle ends of a secondary opening of the voltage transformer is connected with the relay for controlling the opening and closing of the neutral-point thyristor. The automatic control resistance grounding system improves the reliability of medium-voltage power distribution, prevents the occurrence of cable fires, and can be widely applied in 3 to 35kV industrial enterprises and city network power distribution systems.

Description

technical field [0001] The invention belongs to the technical field of electricity and discloses a resistance grounding system, in particular an automatic control resistance grounding system. Background technique [0002] With the rapid development of the current national economy, in order to meet the needs of industrial and agricultural production and people's daily life, my country's power generation facilities and urban network power supply and distribution facilities have also developed by leaps and bounds. Among them, the neutral point grounding method of 3-35kV industrial enterprises and urban network power supply and distribution is one of the important and key issues related to the safe power supply of medium voltage system power supply and distribution. At present, in cable-based industrial enterprises and urban network medium-voltage power supply and distribution systems, it is the general trend to adopt the resistance neutral point grounding method. The medium-vol...

Claims

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Application Information

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IPC IPC(8): H02H9/00H02H9/08H02H9/04
Inventor 刘志廉张春刘居柱
Owner CISDI ENG CO LTD
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