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Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil

A low-current grounding and arc-suppressing coil technology, applied in fault locations, protections that react to fault currents, etc., can solve the problems of harmonic generation and high cost, excessive inductance difference, and poor arc-suppression effect. cost reduction effect

Active Publication Date: 2006-06-28
北京丹华昊博电力科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although these arc suppressing coils have been improved in some aspects, they also have certain problems. The speed is slow, it cannot run at the full compensation point and other shortcomings, and the arc suppression effect is poor
Other arc suppression coils also have problems such as complex structure, harmonic generation and high cost
In addition, the problem of line selection for permanent ground faults has not been well resolved so far

Method used

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  • Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil
  • Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil
  • Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil

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Embodiment Construction

[0020] 8421 shunt reactor combined arc suppression coil primary equipment structure as attached figure 1 Shown. L, L1, L2, L3, and L4 are five shunt reactors. L reactor is used as the basic capacity and is always put into the system. In addition, the reactive power capacity of the four reactors L1, L2, L3, and L4 is 1:2:4: The proportion of 8 is allocated. k1, k2, k3, k4 are vacuum high voltage contactors, which are connected to the system in series with the reactor, so that the switching control of the reactor can be realized by operating the vacuum high voltage contactor, b1, b2, b3, b4 are four lightning arrester. There are sixteen combinations of four reactors, which can form 16 levels of evenly distributed reactor capacity.

[0021] When the system is running normally, the four vacuum high-voltage contactors are closed, the reactors are all put into operation, and the system is running in the over-compensation mode, away from the resonance point to prevent resonance over-vol...

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Abstract

A line selecting system for automatic tuning if arc quenching coil in 8421 parallel reactor integrated type and earthing fault of small current includes is prepared as forming said system by five reactors with one being used always as basic volume and the other four being used in rated value, connecting each of said four reactors to a vacuum high voltage contactor to form sixteen uniform volume of reactor, operating system on over ¿C compensation mode with said four reactors on operation and operating system on full ¿C compensation mode to ensure arc quenching by switching on or off reactor in optimum way when single phase earthing fault is existed on system.

Description

Technical field: [0001] The present invention is mainly applied to the system where the neutral point of the power grid is 66kV and below grounded via the arc suppression coil. When the power grid is single-phase grounded, the system can automatically quickly extinguish the arc and automatically select the ground fault line. technical background: [0002] In the past, 3-66kV power systems usually used neutral point ungrounded methods. In recent years, with the economic development and the expansion of the power system, the increase in the length of the lines in the system and the increase and length of power cable lines have made the ground capacitance of the grid The current has risen sharply, and the capacitance current value has become larger and larger, and the capacitance current of many systems has reached more than 50A. When a single-phase grounding fault occurs in a power grid with an ungrounded neutral point, the arc at the fault point may not be effectively extinguished...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02H3/16
Inventor 杨以涵李砚齐郑
Owner 北京丹华昊博电力科技有限公司
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