Disconnection protection method for comparing line voltages on two sides of line with spare power automatic switching

A disconnection protection, line voltage technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, measurement of electricity, etc., can solve problems such as damage to electrical equipment, motor phase loss, and load power supply

Active Publication Date: 2020-06-19
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are 3~66kV (including 3, 6, 10, 20, 35, and 66kV) line disconnections in various power grids. The disconnection causes the transformer powered by the line to run without phase, which makes the three-phase voltage of the transformer asymmetrical

Method used

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  • Disconnection protection method for comparing line voltages on two sides of line with spare power automatic switching
  • Disconnection protection method for comparing line voltages on two sides of line with spare power automatic switching
  • Disconnection protection method for comparing line voltages on two sides of line with spare power automatic switching

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Embodiment Construction

[0083] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0084] First, take the 35kV line disconnection as an example to analyze the fault characteristics (3, 6, 10, 20, 66kV lines are the same):

[0085] 1.1 Ungrounded or grounded system through arc suppression coil

[0086] 1.1.1 35kV line disconnection

[0087] Such as figure 1 It is a schematic diagram of a 35kV disconnection primary system, taking the phase A short line as an example. The 35kV side of the superior substation is not grounded or grounded through the arc suppression coil, and the 35kV neutral point of the load side 35kV substation transformer is not grounded. Assume that the power potential of the 35kV side of the upper substation is E A ,E B ,E C , U N It is the 35kV neutral point voltage of the substation transformer on the power supply side. If the line is broken at α, then the ground capacitance from the broken line to t...

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Abstract

The invention discloses a disconnection protection method for comparing line voltages on two sides of a line with spare power automatic switching. According to the method, fault characteristics of PTsecondary voltages of transformer substation buses at the power supply end and the load end during single-phase disconnection of the line are fully utilized, the voltages of the buses at the two endsof the line are compared, the power supply side circuit breaker or the load side circuit breaker of the single-phase disconnection jumper line of the line is identified, and the method is simple and easy to implement. The voltage information on the two sides of the line is transmitted through a line optical fiber channel, the line voltages on two sides of the line are compared to identify line breakage, a wire power supply side circuit breaker or a load side circuit breaker is jumped, and then a load-side substation prepares an automatic switching action to start tripping an incoming line circuit breaker and closing the backup power circuit breaker, so that the transformer that has lost power is restored to the standby power supply, the influence of open-phase power supply of the transformer on a power grid and load power supply can be effectively prevented, and safe and stable operation of the power grid is facilitated. The method is implemented by adopting line protection devices onthe two sides of a line, and hardware equipment does not need to be added.

Description

technical field [0001] The invention relates to a disconnection protection method for comparing the line voltage on both sides of the line and cooperating with automatic switching, and belongs to the technical field of protection and control of electric power transmission and distribution networks. Background technique [0002] At present, there are 3~66kV (including 3, 6, 10, 20, 35, and 66kV) line disconnections in various power grids. The disconnection causes the transformer powered by the line to run without phase, making the three-phase voltage of the transformer asymmetrical, and supplying power to the load. If there is an impact, it may damage the electrical equipment, such as causing damage to the motor due to lack of phase operation. In the prior art, there is no relay protection device and method specifically for disconnection of 3-66kV lines. The present invention will propose a way to transmit the voltage information on both sides of the line through the line op...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/28H02J9/06H02J3/00G01R31/08
CPCG01R31/086G01R31/088H02H3/28H02H7/263H02H7/266H02J9/06Y02B70/30Y04S20/20
Inventor 刘昶胡浩孙东杰杨静马骏毅朱燕妮朱文韬周杨于晓蒙
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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