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Automatic tuning and small current grounding failure wire selection system of master slave extinction coil

A low-current grounding and arc-suppression coil technology, applied in fault locations, protection against fault currents, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. The difference is too large, can not run and other problems, to achieve the effect of reliable arc extinguishing

Active Publication Date: 2008-07-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 master slave extinction coil
  • Automatic tuning and small current grounding failure wire selection system of master slave extinction coil
  • Automatic tuning and small current grounding failure wire selection system of master slave extinction coil

Examples

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Embodiment Construction

[0021] The structure of the master-slave arc suppression coil is as follows: figure 1 shown. L1, L2, L3, and L4 are four parallel reactors, and the reactive capacity of the four reactors is distributed according to the ratio of 1:2:4:8. k1, k2, k3, and k4 are vacuum high-voltage contactors, which are respectively connected to the system in parallel with the reactor, so that the switching control of the reactor can be realized through the operation of the vacuum high-voltage contactor. There are sixteen combinations of four reactors, which can form 16 evenly distributed reactor capacities. The design of each reactor of the slave arc suppressing coil is carried out according to the principle of making the ground current after compensation less than 1A (if there are two slave arc suppressing coils, the ground current is less than 2A), and such gear distribution meets the needs of tuning precision.

[0022] The arc suppression coil adopts a master-slave structure. When the syst...

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Abstract

A line selecting system for automatic tuning of master - slave arc quenching coil and earthing fault of small current comprises master arc quenching coil operated on 15 % over - compensation mode at system normal operation, slave arc quenching coil formed by four reactors, a vacuAum high voltage contactor being connected to each of reactors. It featured as operating system on over - compensation mode and setting slave arc quenching coil out of system when system is on normal operation, switching in slave arc quenching coil to operate system on full compensation mode for ensuring arc quenching when single phase earthing fault is existed on system.

Description

[0001] Field: [0002] The invention is mainly applied to the neutral point grounding system of the 66kV and below power grid through the arc-suppressing coil. When a single-phase grounding occurs in the power grid, the system can automatically and quickly extinguish the arc and automatically select the grounding fault line. technical background: [0003] In the past, the 3-66kV power system usually used the neutral point ungrounded method. In recent years, with the development of the economy, the scale of the power system has expanded, the length of the lines in the system has increased, and the power cables have increased and lengthened, making the ground capacitance of the power grid The current rises sharply, and the capacitance current value is getting larger and larger, and the capacitance current of many systems has reached more than 50A. When a single-phase ground fault occurs in the neutral point ungrounded power grid, the arc at the fault point may not be effectively...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08H02H3/16H02H9/08
Inventor 杨以涵李砚齐郑
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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