CN208782486U - A kind of arc-extinction device can be used for power grid AC and DC breaker - Google Patents
A kind of arc-extinction device can be used for power grid AC and DC breaker Download PDFInfo
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- CN208782486U CN208782486U CN201821509439.7U CN201821509439U CN208782486U CN 208782486 U CN208782486 U CN 208782486U CN 201821509439 U CN201821509439 U CN 201821509439U CN 208782486 U CN208782486 U CN 208782486U
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Abstract
The utility model discloses a kind of arc-extinction devices that can be used for power grid AC and DC breaker.Device includes control mechanism, testing agency and executing agency, includes self discharge circuit in parallel；The executing agency includes a breaker, and series connection enters two self discharge in parallel circuits on breaker branch road, and the position of the parallel connection self discharge circuit in series access is located at before and after the breaker.Energy caused by current break is absorbed by self discharge circuit in parallel and is passed through its capacitance gap and discharges energy, prevents the generation of electric arc, solves the problems, such as that electric arc is all kinds of in power grid.
Description
Technical field
The utility model belongs to breaker technical field, and in particular to a kind of to can be used for disappearing for power grid AC and DC breaker
Arc device.
Background technique
When transformer and various electrical equipments put into or exit power grid, all completed by device for switching.When it is in atmosphere
In when cut-offfing, as long as supply voltage is more than 12~20V, the electric current being turned off is more than 0.25~1A, between contact (abbreviation arc gap)
The plasma gas that an extreme temperatures will be generated, issue the conductive near cylindrical of strong light, energy, plasma gas discharge are
For electric arc.
Actually at work, the voltage and current of circuit is both greater than greatly raw arc voltage and raw arc current to device for switching.I.e.
Necessarily lead to this phenomenon of electric arc when cut-offfing circuit in contact gap.On the one hand the generation of electric arc makes circuit still keep to be connected
State, and delay cut-offfing for circuit；Another aspect electric arc do not put out for a long time can also scaling loss contact and neighbouring insulation, when serious very
To the explosion and fire for causing device for switching.Construction and the work for building on the various device for switching in electric arc theoretical basis are former
Reason, all related with electric arc, in numerous electrical equipment fire accidents, the incendiary source critically important as one has caused to disappear electric arc
The attention on anti-boundary.Therefore, we must grasp the principle of generation and the extinguishing of electric arc, to take correct measure, take precautions against quick-fried
Fried and fire incident generation.It for the purpose of arc extinguishing, comes into being, common are true with the breaker of different arc-suppressing methods
Empty breaker, bulk oil circuit, oil-minimum breaker, sulfur hexafluoride breaker etc..Air switch is also one kind of breaker in fact,
For no other reason than that the overvoltage not high electric arc that it is generated in contact does not have to arc extinguishing and will extinguish naturally, so not having to use arc-suppressing method.
But the breaker in some high pressures, super-pressure or extra high voltage line is mutually tied due to arc extinguishing difficulty frequently with a variety of arc-suppressing methods
The mode of conjunction carries out arc extinguishing.Currently used arc-suppressing method has:
(1) rapid elongation electric arc accelerates contact disjunction because the burning of electric arc needs certain arc voltage to maintain
Electric arc rapid elongation can be reduced the electric field strength between contact by speed, make arc voltage be not enough to the burning of pilot arc to
It can make arc extinction；
(2) cooling contacts electric arc with cooling medium, takes away electric arc heat, so that ion motion speed be made to slow down, and makes
The recombination velocity of ion is accelerated, and arc extinction is made；
(3) electric arc is squeezed into narrow slit by narrow slit arc extinguishing, contacts electric arc with solid dielectric to reinforce spreading and cooling, reduce from
The movement velocity of son accelerates ion recombination velocity, makes arc extinction；
(4) long arc is divided into several sections by short arc arc extinguishing, increases voltage requirement, Er Qiezeng required for pilot arc burns
Big heat dissipation area makes undertension between contact to puncture each section of all air gaps, and short electric arc extinguishes simultaneously, no longer restrikes, often
With metal arc-chute subdividing the arc；
(5) extinguish electric arc using gas or oil, so that gas or oil is generated huge pressure using various forms of arc-chutes
And arc gap is effectively blowed to, electric arc is consumingly cooled down and is gone in air-flow or oil stream to dissociate, and dissociant quilt therein
Non- dissociant is replaced, and electric arc just extinguishes rapidly；
(6) multi-break is used, high-voltage circuitbreaker is often made there are two every phases or multiple concatenated fractures, makes to be added on each disconnected
The voltage of mouth reduces, and electric arc is easy to extinguish；
(7) breaker fracture installs parallel resistance additional, and when disconnecting circuit, main contact is first disconnected, and is at this moment connected in parallel on main contact
Resistance on fracture plays shunting function in main contact disconnection process, is conducive to main contact fracture arc extinguishing；
(8) new medium is used, the superior new medium of arc extinction performance, such as SF6 (sulfur hexafluoride) breaker and vacuum are utilized
Breaker etc..
Above method is to force electric arc local environment to be unfavorable for the maintenance of electric arc by the way of forcing arc extinguishing, do not have
It tackles the problem at its root.Individual arc-suppressing method only plays a role to the breaker of low-voltage circuit, so high pressure is breaking
Device is that several arc quenching methods is used to combine to solve the problems, such as high pressure arc extinguishing.This element manufacturing that will lead to high-voltage circuitbreaker is wanted
It asks high, keeps its cost high.
In conclusion method used by all breakers is come with the thinking how extinguished after electric arc generates to disconnected
Road device carries out a series of improvement, does not consider the basic reason generated from electric arc but to eliminate to electric arc, electric arc generates
The reason of make contact overvoltage, can be allowed as long as the overvoltage that moment for disconnecting in contact eliminates contact both ends electric arc from beginning not
In the presence of the utility model is exactly to carry out extinguishing arc in this manner.
Breaker forms electric arc after will lead to overvoltage, connects in transformer-perception circuit in disconnection moment, current break
On breaker can equally generate overvoltage in closure moment, this is because the moment that is powered generates caused by very big current spike
, the overvoltage of most of equipment is as produced by current break.The exactly waveform of power supply sine wave when Transformer Close
Into the position of zero point, transformer can generate dash current, referred to as surge.Transformer will appear excitation in idle-loaded switching-on and gush
Stream, 6-8 times up to 80-100 times of stable state excitation current or rated current of size.Transformer itself will not be made by shoving
At big harm, but electro-mechanical wave can be caused in some cases, if do not taken corresponding measure, may make transformer overcurrent or difference
Dynamic protective relaying maloperation is made.Currently, solving surge is also to make arrester realize, it is extremely short by Surge Protector
Shunting can be connected in time, absorb huge energy.The utility model is due to being to solve the problems, such as that current break is further prevented
The effect of Surge Protector can be played by having stopped overvoltage equally.
For alternating current circuit, in current zero-crossing point electric arc can self-extinguish, reduce a possibility that electric arc generates, by with
The combination of upper several arc quenching methods still can solve arc extinguishing problem；But for DC line, electric current is without zero crossing, arc-rupturing capacity
Very poor, the combination of several arc quenching methods has been insufficient for high voltage direct current arc extinguishing condition, and dc circuit breaker is caused to become research
Difficult point.
Currently, the continuous improvement with the development and user of renewable energy power generation to power requirements, conventional AC power grid
It has been difficult to meet the requirement of renewable energy power generation and load stochastic volatility to power grid fast reaction.With voltage-source type high pressure
The rapid development of current transformer and defeated (matching) power technology of high pressure flexible direct current, the research of (matching) power grid defeated to direct current both at home and abroad is just increasingly
Deeply.In recent ten years, the proposition and development of the HVDC Light technology based on voltage source converter, enables making for direct current transportation
With the transmission of electricity occasion for having extended to short distance, low capacity.On the other hand, in face of the fast development of economic society, user is to electric power
System proposes many new requirements: environment friendly, the promotion of security reliability, more Quality and economy and support user carry out
With the two-way interaction of power grid etc., research have both reliability, safety, stability, economy defeated (matching) power grid of direct current have
Huge market value and economic value.Compared with defeated (matching) electricity of conventional AC: can not only be incited somebody to action using defeated (matching) electric network of direct current
Renewable energy and traditional energy wide area interconnect, and sufficiently improve the utilization rate of renewable energy, and can reduce line loss, increase
Add transmission capacity and transmission range, while solving the stability problem of system synchronous operation.Wherein, the work of defeated (matching) power grid of direct current
One of journey key application technology is exactly the research and development of high voltage DC breaker.As being carried in the stipulated time and cut-off DC grid
The switchgear of normal current and various fault currents, high voltage DC breaker are the fortune of defeated (matching) the electric network construction of direct current
Row, control and protection basis.
Currently, one of the main reason for restricting flexible direct current defeated (matching) electric network practical engineering application be just a lack of it is practical
High voltage DC breaker, main cause are the arc extinguishing problems that the prior art not can solve DC circuit.As carrying, open
The switchgear of disconnected DC operation circuit normal current and various fault currents, how to guarantee dc circuit breaker validity,
Safety and stability be the key that DC line can the whole nation promote, once effectively solve DC transmission system arc extinguishing ask
Topic will provide basis successfully to develop a effective, safe and stable dc circuit breaker, push HVDC Transmission Technology at me
State further applies.
Summary of the invention
In order to achieve the above objectives, the technical solution adopted in the utility model are as follows:
A kind of arc-extinction device can be used for power grid alternating current-direct current breaker includes control mechanism, testing agency and executing agency,
Include self discharge circuit in parallel；The executing agency includes a breaker, and series connection enters two on breaker branch road
The position in self discharge circuit in parallel, the parallel connection self discharge circuit in series access is located at before and after the breaker.
The control mechanism is the controller for receiving signal and assigning instruction, by signal wire and testing agency, is executed
Mechanism is connected.
The self discharge circuit in parallel includes inductance coil and capacitance gap each 1, the inductance coil with it is described
Capacitance gap parallel connection form self discharge circuit in parallel.
The working principle in the parallel connection self discharge circuit are as follows:
When the breaker closing moment, if the breaker can generate in transformer-perception circuit and shove-dash forward
Wave.When shoving through the self discharge circuit in parallel that is connected on breaker both ends, shoving will be in inductance coil both ends shape
At great induced electromotive forceWhen induced electromotive force is greater than the breakdown voltage of capacitance gap, capacitance gap is breakdown,
Cause to shove and form induced current circuit between the inductance coil and the capacitance gap in self discharge circuit in parallel,
Size of current with shove it is equal in magnitude, by the electric current of the inductance coil be it is described shove, pass through the capacitance gap
Sense of current with shove it is contrary, be induction electric will definitely capacitance gap puncture caused by electric current.In capacitance gap
When breakdown, the generated energy in the line that shoves is released between capacitance gap.It shoves by self discharge circuit in parallel
Energy is discharged by its capacitance gap after absorption.
When the breaker disconnects moment, electric current cannot be mutated under normal circumstances, this is because have inductive devices in route,
But when breaker disconnects in the circuit for being in series with self discharge circuit in parallel, electric current will be from some value abrupt transients to zero, the electricity
When stream surging is by the self discharge circuit in parallel that is connected on breaker both ends, surging will form pole at the inductance coil both ends
Big induced electromotive forceWhen induced electromotive force is greater than the breakdown voltage of capacitance gap, capacitance gap is breakdown, causes
Surging forms induced current circuit, electric current between the inductance coil and the capacitance gap in self discharge circuit in parallel
Size and surging it is equal in magnitude, the electric current by the inductance coil is the surging, passes through the electricity of the capacitance gap
The direction of stream is contrary with surging, is that induction electric will definitely the generated electric current of capacitance gap breakdown.It is hit in capacitance gap
When wearing, generated energy is released surging between capacitance gap in the line.Surging is absorbed by self discharge circuit in parallel
Energy is discharged by its capacitance gap afterwards, will lead to current break will not generate overvoltage on the both ends contact of breaker,
Therefore electric arc will not be generated.
Herein, again arrange thinking: electric arc is the air breakdown effect as caused by overvoltage, and overvoltage is again
It is due to caused by current break, if energy caused by current break is absorbed by self discharge circuit in parallel and passes through it
The breakdown of capacitance gap discharges energy, and the overvoltage effect that current break generates will from beginning be not present.
Wherein, in order to discharge energy from self discharge circuit in parallel, the inductance L of the inductance coil disappears needed for need to meeting
The overvoltage energy for the generation electric arc received is applied to induced electromotive force caused by the current changing rate on inductance coil
Guarantee that the capacitance gap is breakdown greater than the breakdown voltage of capacitance gap with this.
To make the current-carrying capacity of the breaker branch become larger, following two mode can choose:
(1) the inductance coil conductor cross-section is greater than norminal size inductance coil conductor cross-section.The wherein volume of inductance coil
The passage section area that scale cun is calculated according to the rated current-carrying capacity of route where breaker.
(2) the series arm both ends in breaker self discharge in parallel with a two circuit branch in parallel, and in the branch
The secondary breaker of road series connection one.
A kind of method controlling the above-mentioned arc-extinction device that attached a secondary breaker includes the following steps:
S1. pass through signal wire after the testing agency detects the signal for needing close circuit breaker and be communicated to controller；
S2. the controller first assigns close command to the breaker after receiving closure signal；
S3. the breaker executes instruction closure；
S4. controller is sent a signal to after the testing agency detects breaker closing；
S5. the controller assigns close command to the secondary breaker after receiving breaker closing signal；
S6. the secondary breaker executes instruction closure；
S7. Operating In Persistent Current Mode is completed in system identification after the testing agency detects secondary breaker closing；
S8. pass through signal wire after the testing agency detects the signal for needing cut-off breaker and be communicated to controller；
S9. the controller first assigns open command to the secondary breaker after receiving cut-off signal；
S10. the secondary breaker executes instruction disconnection；
S11. controller is sent a signal to after the testing agency detects that secondary breaker disconnects；
S12. the controller assigns open command to the breaker after receiving secondary breaker cut-off signal；
S13. the breaker executes instruction disconnection；
S14. open circuit work is completed in system identification after the testing agency detects that breaker disconnects.
The utility model has the beneficial effects that
(1) the utility model only eliminates the condition of electric arc generation with simple circuit and wiring from principle, solves
So far the problem of arc extinguishing difficulty, and it is suitable for all AC and DC breakers, it will not need to put out with a variety of high arc extinguishing means
Go out electric arc, greatly reduces the manufacturing cost of AC and DC breaker；
(2) the utility model not only eliminates overvoltage when breaker disconnects, and overvoltage when eliminating closure, packet
The function of Surge Protector is contained, power grid cost can be substantially reduced, achieved the effect that multi-purpose content.
(3) energy caused by current break is absorbed by self discharge circuit in parallel and is passed through its capacitance gap and releases energy
It puts, prevents the generation of electric arc, solve the problems, such as that electric arc is all kinds of in power grid.
Detailed description of the invention
Fig. 1 is the single branching unit schematic diagram for the breaker that the utility model is applied to non-transformer；
Fig. 2 is the double branching unit schematic diagrames for the breaker that the utility model is applied to non-transformer；
Fig. 3 is the transformer-breaker schematic diagram for not installing the utility model；
Fig. 4 is the single branching unit schematic diagram for the breaker that the utility model is applied to transformer；
Fig. 5 is the double branching unit schematic diagrames for the breaker that the utility model is applied to transformer；
Embodiment one is related to the label meaning in Fig. 1:
1- parallel connection self discharge circuit；2- capacitance gap；3- inductance coil；4- breaker.
Embodiment two is related to the label meaning in Fig. 2:
5- parallel connection self discharge circuit；6- capacitance gap；7- inductance coil；8- breaker；9- pair breaker.
Embodiment three is related to the label meaning in Fig. 4:
19- parallel connection self discharge circuit one；20- capacitance gap one；21- inductance coil one；22- breaker one；23- is in parallel
Self discharge circuit two；25- capacitance gap two；24- inductance coil two；26- breaker two.
Example IV is related to the label meaning in Fig. 5:
9- parallel connection self discharge circuit one；10- capacitance gap one；11- inductance coil one；13- breaker one；The secondary open circuit of 12-
Device one；14- parallel connection self discharge circuit two；16- capacitance gap two；15- inductance coil two；18- breaker two；17- pair breaker
Two.
Specific implementation method
The utility model will be further described below with reference to the accompanying drawings.
Embodiment one as shown in Figure 1, the embodiment for air-break circuit-breaker (air switch) etc. the mode of connection, including simultaneously
Join self discharge circuit 1, capacitance gap 2, inductance coil 3 and breaker 4.Wherein breaker branch road series connection enters two simultaneously
Join self discharge circuit, the position of the parallel connection self discharge circuit in series access is located at before and after the breaker, the electricity
Coil is in parallel with the capacitance gap forms self discharge circuit in parallel for sense.
Embodiment two is as shown in Fig. 2, the embodiment is directed to the mode of connection of air-break circuit-breaker (air switch) etc., in order to make
The current-carrying capacity of the breaker branch becomes larger, on the basis of example 1 a branch in parallel, and connects one on the branch road
A pair breaker 9.
Embodiment three is as shown in figure 4, the embodiment is wrapped for the breaker of transformer or the mode of connection of grounding switch etc.
Include self discharge circuit 1 in parallel, capacitance gap 1, inductance coil 1, breaker 1, self discharge in parallel circuit 2 23,
Capacitance gap 2 25, inductance coil 2 24, breaker 2 26.Wherein the transformer both ends are all provided with, each breaker branch
Two self discharge in parallel circuits of road series connection access, the position of the parallel connection self discharge circuit in series access are located at described disconnected
Before and after the device of road, the inductance coil is in parallel with the capacitance gap to form self discharge circuit in parallel, wherein breaker 1
It is moved at the same time with breaker 2 26.
Example IV is as shown in figure 5, the embodiment is for the breaker of transformer or the mode of connection of grounding switch etc.
The current-carrying capacity of the breaker branch is set to become larger, it is equal at the breaker both ends of two synchronization actions on the basis of embodiment three
A branch in parallel, and secondary breaker of connecting on each road, wherein secondary breaker 1 and secondary breaker 2 17 are same
When act.
Although giving detailed description and explanation to specific embodiment of the present utility model above, it should be noted that
It is that we can carry out various equivalent changes and modification to above embodiment according to the conception of the utility model, produced by
Function still covered without departing from specification and attached drawing spirit when, should be covered by the scope of the present utility model within.
The above, the only preferred embodiment of the utility model, are not intended to limit the utility model, all according to the utility model
Technical spirit any trickle amendment, equivalent replacement and improvement to the above embodiments, should be included in the utility model
Within the protection scope of technical solution.
Claims (6)
1. a kind of arc-extinction device that can be used for power grid AC and DC breaker, it is characterised in that: the arc-extinction device includes control machine
Structure, testing agency and executing agency include self discharge circuit in parallel；The executing agency includes a breaker, described disconnected
Road device branch road series connection enters two self discharge in parallel circuits, and the position of the parallel connection self discharge circuit in series access is located at
Before and after the breaker.
2. arc-extinction device according to claim 1, it is characterised in that: the control mechanism is to receive signal and assign finger
The controller of order is connected by signal wire with testing agency, executing agency.
3. arc-extinction device according to claim 1, it is characterised in that: the self discharge circuit in parallel includes inductance coil
Each 1 with capacitance gap, the inductance coil is in parallel with the capacitance gap to form self discharge circuit in parallel.
4. arc-extinction device according to claim 3, it is characterised in that: needed for the inductance L of the inductance coil need to meet
The overvoltage energy of the generation electric arc of consumption is applied to induced electromotive force caused by the current changing rate on inductance coilGuarantee that the capacitance gap is breakdown greater than the breakdown voltage of capacitance gap with this.
5. arc-extinction device according to claim 3, it is characterised in that: to make the current-carrying capacity of the breaker branch become larger,
The inductance coil conductor cross-section is greater than norminal size inductance coil conductor cross-section.
6. arc-extinction device according to claim 3, it is characterised in that: to make the current-carrying capacity of the breaker branch become larger,
The series arm both ends in breaker self discharge in parallel with a two circuit branch in parallel, and connect one on the branch road
Secondary breaker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821509439.7U CN208782486U (en) | 2018-09-16 | 2018-09-16 | A kind of arc-extinction device can be used for power grid AC and DC breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821509439.7U CN208782486U (en) | 2018-09-16 | 2018-09-16 | A kind of arc-extinction device can be used for power grid AC and DC breaker |
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| CN208782486U true CN208782486U (en) | 2019-04-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109361204A (en) * | 2018-09-16 | 2019-02-19 | 王雪燕 | A kind of arc-extinction device and method can be used for power grid AC and DC breaker |
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2018
- 2018-09-16 CN CN201821509439.7U patent/CN208782486U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109361204A (en) * | 2018-09-16 | 2019-02-19 | 王雪燕 | A kind of arc-extinction device and method can be used for power grid AC and DC breaker |
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