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A protection circuit for dry-type air-core reactor switching overvoltage protection

An air-core reactor and protection circuit technology, applied in emergency protection circuit devices, emergency protection circuit devices, circuit devices and other directions for limiting overcurrent/overvoltage, can solve the problem of time-sharing protection of objects that cannot be protected, overvoltage amplitude low control issues

Active Publication Date: 2016-02-10
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problems that the existing reactor overvoltage protection circuit cannot perform time-sharing protection on the protected object and has low control ability on the overvoltage amplitude

Method used

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  • A protection circuit for dry-type air-core reactor switching overvoltage protection
  • A protection circuit for dry-type air-core reactor switching overvoltage protection
  • A protection circuit for dry-type air-core reactor switching overvoltage protection

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specific Embodiment approach 1

[0051] Specific implementation mode 1: see figure 1 This embodiment is described. A protection circuit for switching overvoltage protection of dry-type air-core reactors described in this embodiment includes a circuit breaker QF, a first reactor DK-1, and a second reactor DK-2 , the third reactor DK-3, the first resistance-capacitance absorption device, the second resistance-capacitance absorption device, the third resistance-capacitance absorption device, the first protection gap Ga, the second protection gap Gb and the third protection gap Gc, the The first resistance-capacitance absorption device includes a first main resistance R SA and the first absorption capacitor C SA , the second resistance-capacitance absorption device includes a second main resistance R SB and the second absorption capacitor C SB , the third resistance-capacitance absorption device includes a third main resistance R SC and the third absorption capacitor C SC ,

[0052] The three-phase input e...

specific Embodiment approach 2

[0054] Specific implementation two: see figure 2 This embodiment is described. The difference between this embodiment and the protection circuit for switching overvoltage protection of a dry-type air-core reactor described in Embodiment 1 is that it further includes a first protection resistor Ra, a second protection resistor Rb and the third protection resistor Rc;

[0055] The first protection resistor Ra is connected in series with the first main resistor R SA and the first absorption capacitor C SA between, and the first protection resistor Ra and the first absorption capacitor C SA After being connected in series, it is connected in parallel with the first protection gap Ga,

[0056] The second protection resistor Rb is connected in series with the second main resistor R SB and the second absorption capacitor C SB between, and the second protection resistor Rb and the second absorption capacitor C SB After being connected in series, it is connected in parallel with...

specific Embodiment approach 3

[0057] Specific implementation three: see image 3 Describing this embodiment, the difference between this embodiment and the protection circuit for switching overvoltage protection of a dry-type air-core reactor described in Embodiment 2 is that it further includes a first fuse FUa and a second fuse FUb and the third fuse FUc; the first fuse Fua is connected in series with the A-phase output end of the circuit breaker QF and the first main resistance R SA between, the second fuse FUb is connected in series with the B-phase output terminal of the circuit breaker QF and the second main resistor R SB Between, the third fuse FUc is connected in series with the C-phase output terminal of the circuit breaker QF and the third main resistance R SC between.

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Abstract

The invention discloses a protective circuit for switching over-voltage protection of a dry air reactor, relates to an over-voltage protective circuit for the dry air reactor, and solves the following problems in the traditional reactor over-voltage protection: the capacitance volume is large and the production cost is high when a resistance-capacitance absorption circuit is singly used, and dispersibility of gap breakdown voltage is increased and service life of protective gap is reduced due to frequent actions of the protective gap when a gap protector is singly used. The protective circuit can be satisfied through choosing proper element parameters according to cut-off current; when the cut-off current is lower, a resistance-capacitance absorption device controls over-voltage amplitude values at two ends of the reactor to prevent the over-voltage amplitude values from reaching the breakdown voltage of the protective gap, the protective gap is in a disconnection state, and the reactor and respective resistance-capacitance elements form an RLC (Radio Link Control) oscillation circuit; when the cut-off current is higher, the over-voltage amplitude values at two ends of the reactor are higher, the protective gap is broken down, and a capacitor and a protective resistor thereof are short out; the protective circuit for the switching over-voltage protection of the dry air reactor is applied to the reactor protection field.

Description

technical field [0001] The invention relates to an overvoltage protection circuit of a dry-type air-core reactor. Background technique [0002] In the ultra-high voltage large-capacity power grid, in order to compensate the reactive power of the power grid, a certain number of reactors are required to be installed. Dry-type air-core reactor adopts multi-encapsulated and wound structure type. Compared with iron-core reactor, it has the technical advantages of low price, simple structure, light weight, linear reactance value, low loss and convenient maintenance. Since the 1990s, dry-type air-core reactors have been widely used in power systems. With the increase of the number of dry-type air-core reactors in operation and the time of operation, accidents have gradually increased, and they often catch fire, which has a great impact on the safe operation of the power system. Field investigations and anatomical studies show that most of the faults of dry-type air-core reactors ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04
Inventor 王永红高自伟朱学成聂洪岩张健赵淼杨飞
Owner STATE GRID CORP OF CHINA
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