CN206575231U - Dynamic delay order combined floodgate system - Google Patents
Dynamic delay order combined floodgate system Download PDFInfo
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- CN206575231U CN206575231U CN201720285956.XU CN201720285956U CN206575231U CN 206575231 U CN206575231 U CN 206575231U CN 201720285956 U CN201720285956 U CN 201720285956U CN 206575231 U CN206575231 U CN 206575231U
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Abstract
The utility model is related to dynamic delay order combined floodgate system, and it includes the line current transformer and breaker mechanism of dynamic delay order closing device, the bus-bar potential transformer for being respectively induced bus three-phase voltage, the line voltage transformer for being respectively induced circuit three-phase voltage, induction line three-phase current；Dynamic delay order closing device includes power supply, cpu system, A/D sampling modules, photoisolator, AC converter and solid-state relay.
Description
Technical field
The method that the utility model is related to dynamic delay order combined floodgate system and avoids bias current from damaging breaker, we
Method is used for the split-phase order shutting-brake control of electric power system circuit breaker, it is adaptable to transformer station, the spy of power plant individual-phase control breaker
Different purpose shutting-brake control method, solves the problem of transmission line of electricity bias current influence breaker arc extinguishing is difficult.
Background technology
In 500kV and above grid power transmission circuit, in order to solve the mistake of long distance line distribution capacity generation
Voltage, capacitive reactive power imbalance problem are, it is necessary in circuit side or both sides and connect reactor.Development and engineering with power network
Reorganization and expansion, after original circuit cut accesses new transformer station, the reactor configured originally " is crossed and mended to new short-term road formation
Repay ", i.e., reactor capacity exceedes the capacity of new short-term road distribution capacity.Thus, closed in new line from side power transmission or operation
During lock, because inductance current can not be mutated, aperiodic component electric current causes the line charging electric current long period to be unable to zero crossing,
That is " bias current ".If in transmission process circuit exist one mutually or two-phase short-circuit fault, circuit relay protection by snap action in
Breaker three-phase trips, due to the bias current not yet zero passage of non-faulting phase, although circuit breaker trip, but the mutually open circuit of point failure
The arc-chutes of device can not arc extinguishing, it is most likely that damages contact of breaker, or even causes breaker to explode, and threatens power grid security fortune
OK.
Conventional circuit breaker combined floodgate mode is that three-phase closes a floodgate simultaneously at random, is closed a floodgate onto line fault, the fast quick-action of relay protection
Make breaking, the DC offset problem of non-faulting phase can not be avoided.Adjourned to if reactor is become from circuit on bus, or by open circuit
Device is replaced by band switching-on resistance type, and equipment and operating expenses are huge.
Utility model content
The application is not judging line bais current attenuation to zero crossing from the angle of breaker control closing circuit, or
After delay set in advance, control three-phase breaker closes a floodgate successively in order, avoids bias current.Science, economically advise
Keep away the security risk that breaker cut-offs bias current.The technical problem that solves in detail and obtain beneficial effect aftermentioned content with
And combine content specific descriptions in embodiment.
To solve the above problems, technical solution adopted in the utility model is：
Using dynamic delay split-phase order shutting-brake control method, shutting-brake control is carried out successively to A, B, C phase breaker：Press
State delay order combined floodgate system and the method for avoiding bias current from damaging breaker, control A phases breaker by presetting first
Voltage phase angle close a floodgate, dynamic delay order combined floodgate system and the method for avoiding bias current from damaging breaker differentiate that A phase is electric
Stream is decayed to after zero crossing, or is reached after the delay of setting, then controls B phase breaker closings.Similarly, B phase current mistakes are differentiated
After zero point, or reach after the delay of setting, then control C phases to close a floodgate.Said sequence closes a floodgate strategy as far as possible by optimization phase angle
Close a floodgate, the appearance of bias current is avoided as far as possible, along with the current zero-crossing point of first combined floodgate phase differentiates, and defined delay is sentenced
Not.Thus, once closing a floodgate onto a certain phase fault of circuit, relay protection action is tripped, because the bias current for first closing phase has passed through
Zero, and the fault current of failure phase zero passage quickly, the circuit breaker trip moment would not have a certain phase current not zero passage, breaker
The risk of not blow-out.
One order of closing a floodgate of dynamic delay split-phase order closing device input measure and control device, exports the combined floodgate of three split-phases
Order.Introduce bus three-phase voltage amount and circuit three-phase voltage amount, circuit three-phase electricity flow, three-phase breaker location status amount.
With reference to three-phase bus voltage selection switching-on phase angle, differentiated using circuit three-phase electricity flow judging and first closed after phase current zero passage again
Close follow-up phase breaker.Realize that dynamic delay differentiates electric current, order closing function.
It is using the beneficial effect produced by above-mentioned technical proposal：
Dynamic delay order combined floodgate avoids the method that bias current damages breaker, it is adaptable to split-phase type primary cut-out
Order shutting-brake control.The popularization and application of this method have significant economic benefit.By taking a 500kV work transmission line as an example,
The scheme to bus is moved from circuit, it is necessary to purchase extra breaker, transformer and disconnecting switch according to by reactor
Etc. equipment, about 6,000,000 yuan are invested；Using dynamic delay order shutting-brake control scheme, it is thus only necessary to purchase 4 sets of control devices, throw
Only 600,000 yuan of money.Save construction investment 5,400,000.
Dynamic delay order closing device has following difference and advantage compared with " control circuit relay protection delay tripping "：
1st, what delay order was closed a floodgate is the opportunity that split-phase does not control breaker closing successively；Circuit relay protection delay tripping
It is then the opportunity of individual-phase control circuit breaker trip；
2nd, delay order closes a floodgate more safer than the control strategy of delay tripping.Because operation of power networks is in practice, newly-built circuit
The risk for recovering to exist on power transmission, circuit latent fault after power transmission or line maintenance is higher, power transmission to faulty line, it is desirable to after
The quick no-delay tripping operation of electric protection, excision failure, just can guarantee that the stabilization of power network, prevent from expanding power failure range.Time-delay closing plan
If slightly unexpected failure, can again attempt to repeat, the safe operation of power network not influenceed.Delay tripping has then been overturned existing
The quick no-delay trip avoidance function of ripe relay protection, if circuit relay protection has selected wrong, failure is separate, can cause not true
Fixed delay excision failure, threatens the stabilization of power grids, causes power failure area to expand.
The beneficial effects of the utility model not limited to this is described, in order to preferably readily appreciate, in embodiment portion
Divide and carried out more preferably detailed description.
Brief description of the drawings
Fig. 1 is control block diagram of the present utility model.
Fig. 2 is workflow diagram of the present utility model.
Fig. 3 is bias current attenuation process schematic diagram.
Embodiment
Such as Fig. 1-3, a kind of dynamic delay order combined floodgate system, including dynamic delay order closing device, for feeling respectively
Answer the bus-bar potential transformer of bus three-phase voltage, the line voltage transformer for being respectively induced circuit three-phase voltage, sensing
The line current transformer and breaker mechanism of circuit three-phase current；
Dynamic delay order closing device includes power supply, cpu system, A/D sampling modules, photoisolator, exchange conversion
Device and solid-state relay；
Power supply is used to provide electric energy to cpu system, and cpu system is electrically connected with photoisolator, line current transformer
Secondary coil is electrically connected with the input of A/D sampling modules, and the output end of A/D sampling modules and the input of cpu system are electrically connected
Connect；
Breaker mechanism includes A phases breaker, B phases breaker and the C phase breakers of separate control, A phase buses
A phase lines are connected by A phases breaker, B phases bus connects B phase lines by B phases breaker, and C phases bus passes through the open circuit of C phases
Device connects C phase lines；
The folding location status information of A phases breaker, B phases breaker, C phase breakers is respectively converted into by photoisolator
Low and high level information simultaneously passes to cpu system；Cpu system controlled respectively by solid-state relay A phases breaker, B phases breaker,
The combined floodgate of C phase breakers；
Line current transformer includes being used to sense the A phase current mutual inductors of A phase line electric currents, for sensing B phase lines
The B phase current mutual inductors of electric current and the C phase current mutual inductors for sensing C phase line electric currents；
The secondary coil of bus-bar potential transformer and the secondary coil of line voltage transformer respectively with AC converter
Input electrical connection, the output end of AC converter electrically connects with the input of A/D sampling modules.Can be accurate so as to realize
Determination close a floodgate phase angle.
Further, in addition to for sending the measure and control device for closing a floodgate and ordering to cpu system by photoisolator.Observing and controlling
Device is the conventional devices such as controllable silicon or auxiliary reclay.
A kind of method for avoiding bias current from damaging breaker, by means of above-mentioned dynamic delay order combined floodgate system, bag
Include following steps：
Step a：First, measure and control device sends combined floodgate order by photoisolator to cpu system；Secondly, Phototube Coupling
Device by the breaker folding condition information transmission of breaker mechanism to cpu system, when the breaker of breaker mechanism is to disconnect
During state, step b is performed.
Step b, first, the voltage for the circuit three-phase that line voltage transformer is respectively induced, line voltage transformer is by line
Road three-phase voltage is delivered separately to A/D sampling modules；Secondly, signal is carried out analog-to-digital conversion by A/D sampling modules, and signal is passed
Pass cpu system；Again, cpu system is judged the voltage of reception, when having voltage in circuit three-phase, CPU systems
A phases breaker, B phases breaker, the C phases breaker of system control breaker mechanism directly close a floodgate simultaneously；When circuit three-phase does not have
When voltage, step c is carried out；
Can obviously it know as those skilled in the art, when the voltage of circuit three-phase is without normal voltage,
Illustrate that circuit is not yet powered, pending power transmission combined floodgate logic, i.e. split-phase order are closed a floodgate；When the voltage of circuit three-phase has normal electricity
During pressure, illustrate that breaker of the circuit from other side is powered, pending and cyclization lock logic directly closes a floodgate.
Step c, first, by being manually set switching order for A phases breaker, B phases breaker, C phase breakers, three tunnels are closed
Lock can set order；Secondly, cpu system controls A phase breaker closings by solid-state relay；
Step d：A phases zero passage judges that the A phase lines current information of sensing is passed through A/D sampling modules by A phase current mutual inductors
Cpu system is passed to, cpu system carries out zero point judgement；If not there is zero point, cpu system continues in presetting delay
It is interior that current over-zero judgement is carried out to A phase lines electric current, after A phase lines current over-zero or arrival preheating setting time, perform step
Rapid e；
Step e：Cpu system controls B phase breaker closings by solid-state relay；
Step f：B phases zero passage judges that the B phase lines current information of sensing is passed through A/D sampling modules by B phase current mutual inductors
Cpu system is passed to, cpu system carries out zero point judgement；If not there is zero point, cpu system continues in presetting delay
It is interior that current over-zero judgement is carried out to B phase lines electric current, after B phase lines current over-zero or arrival preheating setting time, perform step
Rapid g；
Step g：Cpu system controls C phase breaker closings by solid-state relay；
Step h：C phases zero passage judges that C phase current mutual inductors sample the C phase lines current information of sensing mould by A/D
Block passes to cpu system, and cpu system carries out zero point judgement；If not there is zero point, cpu system continues in presetting delay
Current over-zero judgement is carried out to C phase lines electric current in time, after C phase lines current over-zero or arrival preheating setting time, performed
Step j；
Step j；Photoisolator gives the location status information transmission of A phases breaker, B phases breaker, C phase breakers
Cpu system and cpu system judges A phases breaker, B phases breaker and C phases breaker in closing position and/or line current
The current information of circuit three-phase is passed into cpu system by A/D sampling modules with transformer and cpu system judges that circuit three-phase is equal
There is electric current, involution locking non-whole phase protection signal, execution terminates.
Further, while step c is performed, the A phases bus that bus-bar potential transformer is chosen on bus three-phase respectively is made
On the basis of voltage, cpu system press A phase voltages phase control A phase breaker closings set in advance；
Further, while step e is performed, the B phases bus that bus-bar potential transformer is chosen on bus three-phase respectively is made
On the basis of voltage, cpu system press B phase voltages phase control B phase breaker closings set in advance；
Further, while step g is performed, the C phases bus that bus-bar potential transformer is chosen on bus three-phase respectively is made
On the basis of voltage, cpu system press C phase voltages phase control C phase breaker closings set in advance.
Further, after step c is performed and before step d, in addition to step β：Cpu system is defeated by solid-state relay
Go out the signal of locking non-whole phase protection to breaker mechanism, control non-whole phase protection in breaker mechanism to exit；Non-whole phase protection
It is called three phases un identical protection.
Further, after step β and before step d, when A phases close a floodgate failure, A phase breaker trippings, involution
Locking non-whole phase protection signal, return re-executes step b；When A phases close a floodgate normal, step d is performed；
Further, after step e and before step f, when B phases close a floodgate failure, B phase breakers flick involution
Locking non-whole phase protection signal, return re-executes step b；When B phases close a floodgate normal, step f is performed.
Further, after step g and before step h, when C phases close a floodgate failure, C phase breakers flick involution
Locking non-whole phase protection signal, return re-executes step b；When C phases close a floodgate normal, step h is performed.
The utility model, which is fully described, to be disclosed in order to more clear, and is not just being enumerated for prior art.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still be modified to the technical scheme described in previous embodiment, or which part technical characteristic is equal
Replace；It is obvious that multiple technical schemes of the present utility model, which are combined, as those skilled in the art.And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and model of the utility model embodiment technical scheme
Enclose.
Claims (3)
1. a kind of dynamic delay order combined floodgate system, it is characterised in that：Including dynamic delay order closing device, for feeling respectively
Answer the bus-bar potential transformer of bus three-phase voltage, the line voltage transformer for being respectively induced circuit three-phase voltage, sensing
The line current transformer and breaker mechanism of circuit three-phase current；
Dynamic delay order closing device include power supply, cpu system, A/D sampling modules, photoisolator, AC converter with
And solid-state relay；
Power supply is used to provide electric energy to cpu system, and cpu system is electrically connected with photoisolator, the secondary of line current transformer
Coil is electrically connected with the input of A/D sampling modules, and the output end of A/D sampling modules is electrically connected with the input of cpu system；
Breaker mechanism includes A phases breaker, B phases breaker and the C phase breakers of separate control, and A phase buses pass through A
Phase breaker connects A phase lines, and B phases bus connects B phase lines by B phases breaker, and C phases bus is connected by C phases breaker
C phase lines；
The location status information of A phases breaker, B phases breaker, C phase breakers is respectively converted into low and high level by photoisolator
Information simultaneously passes to cpu system；Cpu system controls A phases breaker, B phases breaker, the open circuit of C phases by solid-state relay respectively
The combined floodgate of device；
Line current transformer includes being used to sense the A phase current mutual inductors of A phase line electric currents, for sensing B phase line electric currents
B phase current mutual inductors and C phase current mutual inductors for sensing C phase line electric currents；
The secondary coil of bus-bar potential transformer and the secondary coil of line voltage transformer are defeated with AC converter respectively
Enter end electrical connection, the output end of AC converter is electrically connected with the input of A/D sampling modules.
2. dynamic delay order combined floodgate system according to claim 1, it is characterised in that:Also include be used for by photoelectricity every
From the measure and control device that device sends order of closing a floodgate to cpu system.
3. dynamic delay order combined floodgate system according to claim 2, it is characterised in that:Measure and control device be controllable silicon or
Auxiliary reclay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720285956.XU CN206575231U (en) | 2017-03-23 | 2017-03-23 | Dynamic delay order combined floodgate system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720285956.XU CN206575231U (en) | 2017-03-23 | 2017-03-23 | Dynamic delay order combined floodgate system |
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| Publication Number | Publication Date |
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| CN206575231U true CN206575231U (en) | 2017-10-20 |
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| CN201720285956.XU Expired - Fee Related CN206575231U (en) | 2017-03-23 | 2017-03-23 | Dynamic delay order combined floodgate system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712307A (en) * | 2017-03-23 | 2017-05-24 | 河北农业大学 | Dynamic time-delay sequence switch-on system and method for preventing bias current from damaging breaker |
-
2017
- 2017-03-23 CN CN201720285956.XU patent/CN206575231U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712307A (en) * | 2017-03-23 | 2017-05-24 | 河北农业大学 | Dynamic time-delay sequence switch-on system and method for preventing bias current from damaging breaker |
| CN106712307B (en) * | 2017-03-23 | 2023-05-23 | 河北农业大学 | Dynamic time delay sequential closing system and method for avoiding damage to circuit breaker by bias current |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171020 |
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| CF01 | Termination of patent right due to non-payment of annual fee |