Measuring the voltage of the load-side bus line and the disconnection relay protection method in coordination with the standby automatic switching
A line voltage, self-switching technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems such as damage to electrical equipment, damage, and motor phase loss.
Active Publication Date: 2021-03-02
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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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 and supplies power to the load. If there is an impact, it may damage electrical equipment, such as causing damage to the motor due to lack of phase operation, etc.
In the prior art, there is no relay protection device and method specifically for 3-66kV line disconnection
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[0091] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0092] First, take the 35kV line disconnection as an example to analyze the fault characteristics:
[0093] 1.1 Ungrounded or grounded system through arc suppression coil
[0094] 1.1.1 35kV line disconnection
[0095] 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 the upper substation busbar side is αC, a...
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The invention discloses a disconnection relay protection method for measuring load-side bus-line voltage and coordinating standby self-injection, which is applied to power transmission and distribution networks. The invention makes full use of the load-side transformer substation bus PT secondary line voltage when single-phase line breaks. It is simple and easy to identify the single-phase disconnection of the line and the circuit breaker on the power side or the circuit breaker on the load side of the line. The invention adopts the load-side substation to judge the single-phase disconnection of the power line, starts the remote tripping function of the optical fiber differential protection of the line through the power line, remotely jumps the circuit breaker on the power side of the line or jumps the circuit breaker on the load side, and then automatically switches on by the load-side substation Action, start to trip the incoming circuit breaker, close the backup power circuit breaker, so that the transformer that has lost power can be restored to the backup power supply.
Description
technical field [0001] The invention relates to a disconnection relay protection method for measuring load-side bus line voltage and coordinating backup and 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 that in the substation at the load end, by identifying the abnormal voltage of the bus lin...
Claims
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IPC IPC(8): H02H7/26H02H7/22H02H5/10H02H1/00
CPCH02H1/0007H02H5/10H02H7/22H02H7/26
Inventor 刘昶胡浩汤勋朱文韬姜正驰孙东杰赵伟周杨陈泽
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO