Arc extinction system for power grid
An arc suppression and power grid technology, applied in electrical components, circuit devices, emergency protection circuit devices, etc., can solve problems such as simultaneous action, abnormal and complex grounding of the power grid, affecting the normal operation of the power grid for fault investigation, and achieve the effect of improving stability.
Active Publication Date: 2012-11-21
ZHONGYE-CHANGTIAN INT ENG CO LTD
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Problems solved by technology
In this case, the sequence of action of different arc extinguishing cabinets depends on the difference of each arc extinguishing cabinet, which may cause the arc extinguishing cabinet where the short circuit point is located has not yet acted, while other arc extinguishing cabinets act first, or the power grid Simultaneous operation of multiple arc suppression cabinets
In this way, each arc suppression cabinet is put into protection according to the situation detected by itself, and the protection is withdrawn. Each arc suppression cabinet is grounded through the arc suppression voltage limiter, or the metal is directly grounded, or the grounding is withdrawn, which will lead to abnormally complicated grounding of the power grid. situation, affecting troubleshooting and normal operation of the power grid
[0010] Therefore, the existing arc suppression cabinet is only suitable for the situation of a single substation in the power grid, but not suitable for the situation of a plurality of different substations in the power grid
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[0039] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0040] see image 3, shows a schematic diagram of loop induced current detection in the present invention, each loop outlet is equipped with a zero-sequence transformer 15, the outgoing cable passes through the zero-sequence transformer 15, and the secondary side of the zero-sequence transformer 15 is connected to a small current line selection device 16. Under normal circumstances, the space vector sum of the three-phase currents of the outgoing cables is zero, and there is no induced current on the secondary side of the zero-sequence transformer 15; if an arc fault occurs in a certain circuit, for example, an arc fault occurs in phase A of circuit 2, there is a ground current in the It occurs between phase A and ground, the spac...
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The invention relates to an arc extinction system for a power grid. The bus of the power grid comprises a main loop and a plurality of subloops, wherein the main loop and each subloop are respectively provided with an arc extinction cabinet; the arc extinction cabinet comprises an overvoltage protector, a detection unit, a microcomputer integrated controller and an arc extinction unit; the main loop and each subloop are respectively provided with a zero sequence mutual inductor; the arc extinction cabinet also comprises a low current route selection device; the detection unit is used for detecting whether an arc fault exists in the loop where the detection unit is positioned and sending an arc extinction instruction to the arc extinction unit if the arc fault exists; the zero sequence mutual inductor is used for detecting whether induction current is generated in the loop where the arc fault exists and transmitting the induction current to the low current route selection device if theinduction current is generated; the low current route selection device is used for generating an enabled instruction according to the transmitted induction current and transmitting the enabled instruction to the arc extinction unit; and the arc extinction unit is used for performing arc extinction after receiving the arc extinction instruction and the enabled instruction. The invention also provides the arc extinction cabinet. The arc extinction system can be applied to the arc extinction of the multistage power grid and improve the stability of the power grid.
Description
technical field [0001] The invention relates to the field of power grid transformation and transmission, in particular to a grid arc suppression system. Background technique [0002] Most of the 3-66KV power grids in my country adopt the operation mode of ungrounded neutral point. When a single-phase metal is directly grounded, the voltage of the non-fault phase to the ground will rise to the line voltage, and the three-phase line voltage will remain unchanged. And still has a phase difference of 120 degrees, the work of the three-phase electrical equipment is not affected, so it does not affect the normal transmission of electric energy, so the national standard stipulates that this type of power grid is allowed to operate with faults for a short time after a single-phase ground fault occurs, To make this type of grid sustainable power supply. [0003] The existing operating regulations stipulate that when a single-phase ground fault occurs in the neutral point non-effective...
Claims
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IPC IPC(8): H02H9/04
Inventor 刘雁飞高鹏双
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD