The method and application of line disconnection protection based on voltage vector difference and standby automatic switching
A technology of disconnection protection and vector difference, applied in the field of power equipment, can solve the problems of load power supply impact, transformer power failure maintenance, transformer three-phase voltage asymmetry, etc.
Active Publication Date: 2021-04-27
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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Problems solved by technology
The disconnection caused the 110kV transformer powered by the 110kV line to run without phase, making the three-phase voltage of the transformer supplying power asymmetrical, which affected the load power supply, and even the 110kV neutral point of the 110kV transformer was broken down due to zero-sequence overvoltage. Forced power outage maintenance
At present, there is no relay protection device specifically for 110kV line disconnection. This invention will propose a method to transmit the voltage information on both sides of the line through the 110kV line fiber optic channel in the load-side substation, and compare the voltage vector difference on both sides of the line to identify the 110kV line disconnection. A single-phase disconnection relay protection method that jumps the power side circuit breaker or load side circuit breaker of the 110kV disconnection line, and restores the power supply by the 110kV substation backup automatic switching on the load side
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[0059] 110kV line disconnection analysis:
[0060] 1. 110kV line disconnection analysis
[0061] When the 110kV neutral point of the 110kV transformer substation on the load side is not grounded, it is the case of 110kV line disconnection 1. When the 110kV neutral point of the 110kV substation transformer on the load side is grounded, it is the 110kV line disconnection case 2.
[0062] 1.1 110kV line disconnection 1
[0063] 1.1.1 110kV line disconnection
[0064] like figure 1 Schematic diagram for the primary system of 110kV disconnection Figure 1 . The 110kV side of the 220kV substation on the system side is an effective grounding system; the 110kV neutral point of the 110kV transformer substation on the load side is ungrounded and grounded through a gap.
[0065] Assume that the power supply potentials of the 220kV substation on the system side and the 110kV side of the substation are respectively E A , E B , E C . When the 110kV line is broken somewhere, such a...
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The invention discloses a line disconnection protection method and application based on voltage vector difference and standby self-switching, using the fault characteristics of the 110kV bus PT secondary voltage of the power supply end and the load end substation when the 110kV line is single-phase disconnected, and comparing the 110kV The busbar voltage vector difference at both ends of the line is to identify the single-phase disconnection of the 110kV line. To identify the single-phase disconnection of the 110kV line, the circuit breaker on the power side or the load side of the 110kV line is used to jump the circuit breaker on the power side of the 110kV line. The impact of transformer lack of phase power supply on the power grid and load power supply, and at the same time prevent the 110kV neutral point of the 110kV transformer from burning out, ensuring the safe and stable operation of the power grid.
Description
technical field [0001] The invention relates to a line disconnection protection method and application based on voltage vector difference and automatic switching, and belongs to the technical field of electric power equipment. Background technique [0002] At present, there are 110kV line disconnections in the power grids around the country. The disconnection causes the 110kV transformer powered by the 110kV line to operate without phase, which makes the three-phase voltage of the power supply transformer asymmetrical, which affects the load power supply, and even the 110kV neutral point of the 110kV transformer is broken down due to zero sequence overvoltage. Forced power outage for maintenance. At present, there is no relay protection device specifically for 110kV line disconnection. The present invention will propose a method to transmit the voltage information on both sides of the line through the 110kV line optical fiber channel in the substation at the load end, and c...
Claims
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IPC IPC(8): H02H7/26H02H3/28H02J3/00G01R31/54G01R19/00
CPCG01R19/0084H02H3/28H02H7/263H02H7/266
Inventor 杨茹李静陈永明胡航候超宋丽曹斌汤大海魏刚王律徐溯
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO