CN106129957A - A kind of circuit structure cut-offfing short circuit current based on paralleling switch device - Google Patents
A kind of circuit structure cut-offfing short circuit current based on paralleling switch device Download PDFInfo
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- CN106129957A CN106129957A CN201610519117.XA CN201610519117A CN106129957A CN 106129957 A CN106129957 A CN 106129957A CN 201610519117 A CN201610519117 A CN 201610519117A CN 106129957 A CN106129957 A CN 106129957A
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- switch
- cut
- short circuit
- reactor
- circuit current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention provides a kind of circuit structure cut-offfing short circuit current based on paralleling switch device, provide the circuit structure that high-tension switch gear parallel connection is cut-off, suppression loop seals in reactor switching device is cut-off the impact of short circuit current, it is achieved the parallel connection of switching device is cut-off.It includes reactor and two switches being arranged in parallel；Reactor is provided with a public input and two outfans, and two outfans of reactor are connected with two switches respectively, and the fracture of switch is arranged in parallel capacitor, and the outfan of two switches is public output after being connected.Utilize reactor by after short circuit current current-sharing/current limliting, the mode using switch fracture parallel capacitor suppresses the reactor impact on cut-offfing, short circuit current after making switch can cut-off current-sharing current limliting, ensure that switching device in parallel all can effectively cut-off, finally realize the safe operation of high voltage power network.
Description
Technical field
The present invention relates to cut-off the technical field of short circuit current, be specially one and cut-off short circuit electricity based on paralleling switch device
The circuit structure of stream.
Background technology
Existing 220kV and the electrical network of above, many places occur that short-circuit current value exceedes conventional arc-chutes 63kA's
Connecting-disconnecting function, even up to 80kA, and the breaking device of this electric pressure short circuit current is SF6Chopper, therefore opens
The device of disconnected bigger short circuit current ability is very urgent, and this invention is exactly that bigger short circuit current problem is cut-off in solution.
Electric arc in gas-break switch belongs to hyperbar electric arc, has the C-V characteristic of decline.Short circuit is cut-off in parallel running
During electric current, if two arc-chutes actions are inconsistent, or due to other disturbance, an arc-chutes branch impedance is caused to become big, and another
Article one, branch impedance is relatively small, then electric current shifts to the branch road that impedance is little, and the biggest arc resistance of electric current is the least, more promotes electric current
Shift to this branch road, finally all may be undertaken by a branch road by electric current, and exceed it and cut-off the limit；Another branch road electric arc
Electric current is more and more less, it is also possible to because self-energy arc-extinguishing chamber gas production causes failure of interruption not.Visible hyperbar arc-chutes are not
Can directly parallel running.
Chinese patent 200710052947.7, Chinese patent 200810197118.2, Chinese patent 200910208943.2
With Chinese patent 201410127571.1, all it is referred to correlation technique and the principle of parallel circuit breaker, and all from reactor
Design angle is studied and has been described.All think that reactor is capable of automatic current equalizing and current-limiting function, thus realize significantly
Increase chopper bear rated short circuit current and cut-off the ability of short circuit current, but after the most not mentioned loop seals in reactor to
Arc-chutes cut-off the impact that short circuit current brings.
When preferable current-sharing synchronous switching off, loop is shown as approximating zero impedance by reactor, when current limliting cut-offs state, and electricity
Anti-device shows as big impedance to loop, thus the purpose cut-off after reaching current limliting.And switch in parallel in actual interrupting process
Device cannot accomplish ideal synchronisation, and the switch because hereafter cut-offfing will cut-off the big impedance of the reactor entering limited current state, and
Enter the big impedance operator of reactor of limited current state and cause the too fast transient recovery voltage of switching device fracture after current over-zero,
And significantly beyond the insulation recovery ability of switch, the switch failure of interruption on road of paying wages after causing.I.e. reactor is during current limliting
That opens after causing switchs the recovery voltage that fracture is too fast so that switch cannot effectively cut-off.
Summary of the invention
For problems of the prior art, the present invention provides a kind of and cut-offs short circuit current based on paralleling switch device
Circuit structure, it is provided that the circuit structure that high-tension switch gear parallel connection is cut-off, suppression seals in reactor to switching device in loop
Cut-off the impact of short circuit current, it is achieved the parallel connection of switching device is cut-off.
The present invention is to be achieved through the following technical solutions:
A kind of circuit structure cut-offfing short circuit current based on paralleling switch device, including reactor and two be arranged in parallel
Switch；Reactor is provided with a public input and two outfans, two outfans of reactor respectively with two switches
Series connection, the fracture of switch is arranged in parallel capacitor, and the outfan of two switches is public output after being connected.
Preferably, two identical inductances coil Same Name of Ends of reactor employing are oppositely wound makes.
Preferably, described switch uses gas as the chopper of arc-extinguishing medium.
Preferably, described switch uses the chopper including gas arc-extinguishing chamber, and its single short circuit current connecting-disconnecting function is high
In 110kV/40kA.
Preferably, the fracture of two switches is arranged in parallel capacitor respectively；Capacitor is connected in parallel on switch fracture two ends respectively,
Or capacitor one end connects the input to inductive switch fracture, other end ground connection.
Preferably, the switch fracture formerly cut-off is arranged in parallel capacitor, after be not provided with on the switch fracture that cut-offs
Capacitor；The capacitor two ends at first open switch fracture in parallel, or the input of the first open switch fracture of capacitor one end connection
End, other end ground connection.
Compared with prior art, the present invention has a following useful technique effect:
Circuit structure of the present invention utilizes reactor by after short circuit current current-sharing/current limliting, uses switch fracture in parallel
The mode of capacitor suppresses the reactor impact on cut-offfing so that switch can cut-off the short circuit current after current-sharing current limliting, protects
The switching device of card parallel connection all can effectively cut-off, and finally realizes the safe operation of high voltage power network.
In circuit structure of the present invention, reactor have employed the shunt reactor winding that Same Name of Ends is reverse, each with switch
After branch road series connection, it is possible to ensure: when two branch roads are normal through electric current, reactor does not affect the line parameter circuit value of transmission line of electricity；Two
When road is normal through short circuit current, short circuit current divided equally by reactor, makes each branch road in parallel flow through the degree of unbalancedness of electric current less than setting
Evaluation；During two branch breaking short circuit currents, each branch, short-circuit current value less than the rated short circuit drop-out current value of arc-chutes, each
Road under the conditions of cut-offfing the most in the same time, after cut-off the short-circuit current value of branch road and be limited to the rated short circuit drop-out current of arc-chutes
Below value.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of single capacitor ground connection described in present example.
Fig. 2 is the electrical block diagram of double capacity earths described in present example.
Fig. 3 is the electrical block diagram that single capacitor described in present example is in parallel.
Fig. 4 is the electrical block diagram that described in present example, double electric capacity are in parallel.
In figure: reactor the 1, first capacitor 21, second capacitor the 22, first switch 31, second switch 32.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, described in be explanation of the invention and
It not to limit.
The present invention adds capacitor at reactor 1 and switch room, and the too fast transient state that reactor 1 can be suppressed to cause is recovered
Voltage, makes the transient recovery voltage arc extinguishing ability less than arc-chutes at arc-chutes two ends, thus ensures effectively cut-offfing of arc-chutes.
Capacitor can use two kinds of connected modes, and as shown in figures 1 and 3, one end is connected one with the reactor 1 in loop, one end
Ground connection；As shown in Figure 2 and Figure 4, two ends with the switch in loop respectively, the two ends of capacitor are connected another kind.When the most in parallel
Two branch roads of switch cut-off successively, road of paying wages after determining, then only need to after cut-off loop and add capacitor；If cannot be clear and definite
Article two, the rear spending road of branch road, then two branch roads all access capacitor.
Wherein, reactor 1 have employed the shunt reactor winding that Same Name of Ends is reverse, after connecting with each branch road of switch, it is possible to
Ensure: when two branch roads are normal through electric current, reactor 1 does not affect the line parameter circuit value of transmission line of electricity；Two branch roads are normal through short circuit
During electric current, short circuit current divided equally by reactor, makes each branch road in parallel flow through the degree of unbalancedness of electric current less than design load；Two branch breakings
During short circuit current, each branch, short-circuit current value is less than the rated short circuit drop-out current value of arc-chutes, and each branch road is being opened the most in the same time
Under the conditions of Duan, after cut-off the short-circuit current value of branch road and be limited to below the rated short circuit drop-out current value of arc-chutes.
Wherein, switch as gas as the chopper of arc-extinguishing medium.Switch the chopper on every branch road and typically use list
The chopper of the secondary short circuit current connecting-disconnecting function gas arc extinguishing higher than 110kV/40kA.
Concrete, reactor 1 is formed by two identical inductances coil Same Name of Ends are oppositely wound, in the case of the most through-flow,
First switch 31 and second switch 32 are all in closure state.When the electric current flowing through two inductance coils is equal, two branch roads produce
Raw magnetic flux in opposite direction, equal-sized, only presents leakage impedance after two coil couplings, and resistance value is the least, is lost permissible
Ignore.When the electric current flowing through two inductance coils is unequal, the magnetic flux of alternation can be produced in coil, thus induce alternation
Electromotive force, this electromotive force makes the electric current in two coils tend to equal so that the electric current in two branch road arc-chutes tends to equal.
In the case of cut-offfing short circuit current, the first switch 31 and second switch 32 open generation electric arc, if first opens simultaneously
Pass 31 and second switch 32 extinguish electric arc simultaneously, then it represents that successfully cut-off short circuit current；If the first switch 31 first blow-outs, corresponding
Electric current vanishing in inductance coil, now short circuit current is fully loaded on another inductance coil and second switch 32, and
The inductance coil being loaded electric current now presents bigger inductance, and short circuit current is restricted to the specified of single arc-chutes
Below operation-current value, thus the arc-chutes cut-off after ensureing still are able to successfully blow-out.
Even if in equal stream mode, the first switch 31 and second switch 32 cannot be accomplished to synchronize to extinguish electric arc.
As depicted in figs. 1 and 2, clear and definite first switch 31 extinguishes electric arc after second switch 32, therefore the first switch 31
Circuit parameter impedance moment becomes big, the process of excision impedance, causes quick transient recovery voltage, for these the first switch 31 fractures
And upper first electric capacity 21 or input are through the first electric capacity 21 ground connection, thus offset the impact of excision impedance, it is ensured that the first switch 31
Again do not punctured after current over-zero, it is achieved effectively cut-off.
As shown in Figure 3 and Figure 4, at second switch 32, which first extinguishes electric arc to uncertain first switch 31, for this at two
Switch fracture distinguishes the most in parallel and upper first electric capacity 21 and the second electric capacity 22, or at input respectively through the first electric capacity 21 and second
Electric capacity 22 ground connection, it is ensured that open after whichever switch, all can offset the impact of excision impedance, it is ensured that the first switch 31 is second
The most again do not punctured after switching 32 current over-zeros, it is achieved effectively cut-off.
Claims (6)
1. the circuit structure cut-offfing short circuit current based on paralleling switch device, it is characterised in that include reactor (1) and also
Two switches that connection is arranged；Reactor (1) is provided with a public input and two outfans, and two of reactor (1) defeated
Going out end to connect with two switches respectively, the fracture of switch is arranged in parallel capacitor, and the outfan of two switches is public affairs after being connected
Outfan altogether.
A kind of circuit structure cut-offfing short circuit current based on paralleling switch device the most according to claim 1, its feature exists
In, reactor (1) two identical inductances coil Same Name of Ends of employing are oppositely wound to be made.
A kind of circuit structure cut-offfing short circuit current based on paralleling switch device the most according to claim 1, its feature exists
In, described switch uses gas as the chopper of arc-extinguishing medium.
A kind of circuit structure cut-offfing short circuit current based on paralleling switch device the most according to claim 1, its feature exists
In, described switch uses the chopper including gas arc-extinguishing chamber, and its single short circuit current connecting-disconnecting function is higher than 110kV/40kA.
A kind of circuit structure cut-offfing short circuit current based on paralleling switch device the most according to claim 1, its feature exists
In, the fracture of two switches is arranged in parallel capacitor respectively；Capacitor is connected in parallel on switch fracture two ends, or capacitor one end respectively
Connect the input to inductive switch fracture, other end ground connection.
A kind of circuit structure cut-offfing short circuit current based on paralleling switch device the most according to claim 1, its feature exists
In, the switch fracture formerly cut-off is arranged in parallel capacitor, after be not provided with capacitor on the switch fracture that cut-offs；Capacitor
Two ends at first open switch fracture in parallel, or the input of the first open switch fracture of capacitor one end connection, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610519117.XA CN106129957A (en) | 2016-07-01 | 2016-07-01 | A kind of circuit structure cut-offfing short circuit current based on paralleling switch device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610519117.XA CN106129957A (en) | 2016-07-01 | 2016-07-01 | A kind of circuit structure cut-offfing short circuit current based on paralleling switch device |
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| CN106129957A true CN106129957A (en) | 2016-11-16 |
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| CN201610519117.XA Pending CN106129957A (en) | 2016-07-01 | 2016-07-01 | A kind of circuit structure cut-offfing short circuit current based on paralleling switch device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224739A (en) * | 2021-04-19 | 2021-08-06 | 国网江苏省电力有限公司检修分公司 | Current limiting device for grounding time of grounding wire of synchronous phase modulator |
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| CN101728140A (en) * | 2008-10-27 | 2010-06-09 | 国网武汉高压研究院 | High voltage or ultra-high voltage high-current circuit breaker |
| CN101728825A (en) * | 2009-11-13 | 2010-06-09 | 西北电网有限公司 | Device for limiting peak value and rate of rise of transient recovery voltage of circuit breaker |
| CN102868142A (en) * | 2012-09-24 | 2013-01-09 | 中国西电电气股份有限公司 | Topological structure for operation of short circuit impact generator |
| CN202712082U (en) * | 2012-07-19 | 2013-01-30 | 乐清市基恩电器有限公司 | High-voltage breaker |
| US20150221464A1 (en) * | 2012-10-11 | 2015-08-06 | Abb Technology Ag | Pole part of a medium voltage circuit breaker arrangement comprising a triggered gap unit |
-
2016
- 2016-07-01 CN CN201610519117.XA patent/CN106129957A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728140A (en) * | 2008-10-27 | 2010-06-09 | 国网武汉高压研究院 | High voltage or ultra-high voltage high-current circuit breaker |
| CN101728825A (en) * | 2009-11-13 | 2010-06-09 | 西北电网有限公司 | Device for limiting peak value and rate of rise of transient recovery voltage of circuit breaker |
| CN202712082U (en) * | 2012-07-19 | 2013-01-30 | 乐清市基恩电器有限公司 | High-voltage breaker |
| CN102868142A (en) * | 2012-09-24 | 2013-01-09 | 中国西电电气股份有限公司 | Topological structure for operation of short circuit impact generator |
| US20150221464A1 (en) * | 2012-10-11 | 2015-08-06 | Abb Technology Ag | Pole part of a medium voltage circuit breaker arrangement comprising a triggered gap unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224739A (en) * | 2021-04-19 | 2021-08-06 | 国网江苏省电力有限公司检修分公司 | Current limiting device for grounding time of grounding wire of synchronous phase modulator |
| CN113224739B (en) * | 2021-04-19 | 2024-02-09 | 国网江苏省电力有限公司检修分公司 | Current limiting device for grounding time of grounding wire of synchronous camera |
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Application publication date: 20161116 |