CN103399217B - Method seeking reason for mis-trip of secondary switch of B-phase grounded TV due to operation interference - Google Patents
Method seeking reason for mis-trip of secondary switch of B-phase grounded TV due to operation interference Download PDFInfo
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Abstract
The invention provides a method seeking a reason why operation interference causes mis-trip of a secondary switch of a B-phase grounded TV. Under the condition that the secondary switch of the bus TV is tripped out when a primary disconnector is operated, and the B phase of the secondary side of the TV is confirmed to be grounded, dynamic indexes of the disconnector during switching on/off tests are detected as following 1) whether current pulse peak is greater than 30A, probable range greater than 30times/s, and lasting time more than 500ms are detected; 2) whether power-frequency input impedance between the secondary switch and the ground is lower than 0.1omega is detected; 3) whether quick-break current of the secondary switch is lower than 10pu is detected; and 4) whether the trip-out time of the secondary switch is less than 100ms is detected. The method of the invention can effectively determine mis-tripping as well as power failure of protective equipment caused by high-frequency strong current pulse due to disconnector operation together with performance problems of the secondary switch of the TV, so that effectively measures can be adopted and faults can prevented.
Description
Technical field
The present invention relates to a kind of detection method found a switch operation interference and cause B phase ground connection TV bis-switch trip reasons, belong to power system transformer substation resist technology field.
Background technology
The fault of bus TV bis-switch trips was there is in Huangdao Power Plant, generating plant, Jining, Huang Tai generating plant etc. when successively there is several times switch operation; and then cause the distance protection action tripping operation of bus associated circuitry, transformer, cause the major accident of unit outage large-area power-cuts thus.
Such as, Huang Island power plant 220kV booster stations nineteen ninety there will be the fault of TV bis-switch trips after putting into operation when switch operation, after taking some measures at that time, maintain operation reluctantly.Until in January, 2010, when operating disconnecting link, repeatedly there is again bus TV secondary load decompression, accident that distance protection action, two 220kV switches trip simultaneously.The operation interference of obvious disconnecting link and the hidden danger of switch mis-jumping thoroughly do not solve, and the generation of accident not only causes loss to power plant, have also injured the safe operation of electrical network.
Switch operation interference causes the problem of B phase ground connection TV bis-switch trips very outstanding, though have relevant report in data before, the problem thinking of problem analysis and solution differs greatly.Be similar to and occur in operation transformer station that above-mentioned example says, switch operation interference causes the problem of TV bis-switch trips and distance protection misoperation never to find reason and the disposal route of fault for a long time.
Summary of the invention
The present invention is directed to the problem that a switch operation interference causes B phase ground connection TV bis-switch trips, provide a kind of detection method that can detect and confirm TV No. bis-switch malfunction trip reasons.
The technical scheme of employing of the present invention is as follows:
Find the detection method that a switch operation interference causes B phase ground connection TV bis-switch trip reasons; bus TV bis-switch trips when carrying out a switch operation; protection act, carries out the dynamic test of the charged divide-shut brake of disconnecting link and relevant envelope test under the condition confirming TV quadratic B phase ground connection:
(1) the Peak of current pulse >30A produced when detecting the test of charged deciliter of disconnecting link, the probable range >30 time/s that electric current occurs, the time >500ms of continuing current flow;
(2) detect secondary P cock over the ground between power frequency input impedance whether be less than 0.1 Ω;
(3) whether the quick-break electric current detecting secondary P cock is less than 10pu;
(4) whether the trip time detecting secondary P cock is less than 100ms;
If the Peak of current pulse >30A produced during the disconnecting link opening and closing test detected, probable range 30 times/s, lasting time >500ms; Secondary switch over the ground between power frequency input impedance be less than 0.1 Ω; The quick-break electric current of secondary switch is less than 10pu; The trip time of secondary switch is less than 100ms.And these 4 conditions exist simultaneously; just can determine to cause the reason of secondary switch motion be: in the loop that the high-frequency coupling voltage that switch operation produces is formed by B phase TV No. bis-switches, ground wire and earth mats, to create high frequency By Impulsive Current; the impulse density of this electric current meets secondary switch motion condition with the time continued; cause it to trip, and then make protection misoperation.
The invention has the beneficial effects as follows: by detect trip time of secondary P cock, the quick-break electric current of secondary P cock, power frequency input impedance and disconnecting link opening and closing test time the record ripple dynamic indicator that detects determine the reason of switch malfunction.The present invention effectively can judge that the performance issue of TV No. bis-switches causes switch mis-jumping and causes equipment to have a power failure, to take effective measure, prevents the generation of fault.
Accompanying drawing explanation
Fig. 1, Huang Island power plant method of operation wiring diagram;
The voltage dependent resistor (VDR) of Fig. 2 (a), bus TV second loop return wiring and the position of capacitor;
Fig. 2 (b), I bus TV No. bis-switches are schemed with numbering;
Fig. 2 (c), II bus TV No. bis-switches are schemed with numbering;
Fig. 3, central station of floating dock schematic diagram is transferred to by switch gear room in the position of earth point;
Secondary voltage waveform enlarged drawing during the tripping operation of Fig. 4, #1TV P cock;
Fig. 5, AC phase voltage dividing potential drop phasor graph;
Fig. 6, secondary current waveform during point disconnector;
Fig. 7, secondary current waveform during conjunction disconnector;
Secondary voltage waveform enlarged drawing during the tripping operation of Fig. 8, #2TV P cock;
Fig. 9, containing the offset distance protection act characteristic of round dot.
Embodiment
Embodiment (for Huangdao Power Plant switch operation)
The present invention analyzes the example solving switch operation interference and cause B phase ground connection TV bis-switch trips, illustrate trouble-shooting detection method, determining the superpotential that switch operation produces, and superpotential transmission causes the reason of TV bis-switch trips and is setting up the work done in rational index system.
Use the dynamic parameter of 20MHz bandwidth oscillograph to operation interference voltage, electric current to carry out record ripple at the scene to detect; The static parameter etc. of secondary circuit, switch is tested; The component problem of the location problem relevant with stray capacitance and relating to parameters is analyzed with the earth mat problem that structure is correlated with, thus determines the reason of fault.
During confirmation switch operation, the reason of TV switch trip is not that power frequency short circuit causes, but the electric current produced by high frequency interference has exceeded working value I
dzcause; TV No. bis-switch breakings cause circuit distance protection decompression and action, force line outage, compressor emergency shutdown.
One, phenomenon of the failure
On January 5th, 2009, Huangdao Power Plant stops #4 machine operation no problem.January 13, during high standby change power failure operation, there occurs the problem that two bus TV No. bis-switches trip jointly, January 15, high for when becoming power transmission operation, consistent when result and power failure operation.TV bis-switch trips result in B phase dead electricity, and lock is chosen in two route protection misoperations.Carried out repeatedly dividing, closing test to disconnecting link 204-1 afterwards, and done the inspection of record ripple, final confirmation TV bis-three-phase voltages are normal, and secondary neutral N630, neutral point N640 do not have superpotential phenomenon to occur; TV does not have grounding phenomenon bis-times yet, the power frequency short trouble do not caused because of problem with grounding; That high-frequency current acts on TV bis-switch trips.This is taken to the corresponding precautionary measures: use shielded cable; By shielding layer grounding; TV uses split-phase switch bis-times; Improve the action index of TV bis-split-phase switch; TV only retains an earth point bis-times; Earth point is away from booster stations; Use grounding copper bar etc.Operation result shows, the problem of TV bis-switch trips and route protection misoperation is resolved.So, the historical problem left over before solving 20 years.Fig. 1 is shown in the wiring of Huang Island power plant system.The doubtful point analyzed is worth to have:
Doubtful point 1, the historical problem relevant to the age.January nineteen ninety, TV secondary neutral added Zinc-Oxide Arrester, and in June, 90 secondary phase-splitting adds voltage dependent resistor (VDR), the record once having secondary switch trip for 20 years afterwards, but very few.Recent two weeks comes, and carries out 6 times different operations, and why all there occurs the problem of secondary switch trip at every turn.
Doubtful point 2, the space problem relevant to bus.Each secondary switch trip occurred in the past, when all occurring in the operation of I bus, does not trip during the operation of II bus, visible relevant with the locus of primary equipment.
Doubtful point 3, the earth mat problem relevant to structure.How current earth mat effect is worth research.Special grounding copper bar do not laid by generating plant, more do not have the copper bar that ring gets up to connect, if effect how about after laying special grounding copper bar.
Doubtful point 4, the plant issue relevant with protection.Circuit I, II protection misoperation, circuit III does not have action.
Doubtful point 5, the stray capacitance problem relevant with layout.Also relevant with the locus of equipment cable etc.
Two, checking process
1, TV secondary circuit and static parameter inspection
(1) general inspection
Bus TV second loop return wiring is shown in Fig. 2.
Fig. 2 (a), the position of voltage dependent resistor (VDR) and capacitor is I bus TV second loop return wiring part, and A601, B601, C601, L601, A630, B600, C630, L630, N630, Sa630 are loop numbering; F311 is I bus TV second protection P cock; RD is fuse.
Fig. 2 (b) is corresponding I bus TV second loop return wiring, and A630 ', C630 ' are loop numbering, and F321 is metering P cock.
Fig. 2 (c) is corresponding II bus TV second loop return wiring, and A601 ', B601 ', C601 ', A640, B600, C640, N640 are loop numbering, and F411 is protection P cock; F421 is metering P cock.
The scope of examination and result as follows.
There is multipoint earthing problem bis-times in TV, all TV ground connection all on the spot of generating plant, and have connecting line between earth point, so causes multipoint earthing.
TV bis-switchgear distribution and parameter situation:
Protection TV bis-A, C are in parallel the capacitor of 2 × 4 μ F;
Protection TV bis-A, B, C three-phase ganged P cock rated current 3A;
Metering TV bis-A, B, C three-phase ganged P cock rated current 5A;
The protection pattern C3 of TV No. bis-switches, characterisitic parameter sees the following form:
(2) action parameter such as secondary switch test
TV bis-three-phase stars, delta windings voltage dependent resistor (VDR) (non-linear resistance) parameter in parallel, the method for voltage dependent resistor (VDR) external dc checks that its operation voltage is 175V; The design load of TV second breakdown insurance is 220V.
Power frequency action current is 7 times of rated current, i.e. 7pu, t=80ms.
High-frequency current also can start secondary switch trip.
Ground connection TV secondary current index, the power current 18mA in B601 loop.
(3) loop industrial frequency AC testing impedance
Earth point is when diverse location, and from TV secondary wiring terminals measurement AC impedance relatively, namely undesired signal flows through the AC impedance in loop, and numerical value sees the following form.
| Electric parameter | Switch place ground connection on the spot | TV100m outer central station of floating dock place ground connection |
| I (electric current) | 5A | 5A |
| U (voltage) | 1.0V | 8.1V |
| Z (impedance) | 0.20Ω | 1.62Ω |
The position of earth point is see Fig. 3.
2, the historical problem inspection of TV
The situation of (1) twice transformation
During initial design, TV secondary neutral has installed breakdown fuse, but the frequent ground connection of breakdown fuse after running, cause the short circuit of B phase, switch trip.
First time transformation, installed one group of Zinc-Oxide Arrester January nineteen ninety in TV secondary neutral, operation result shows, produces little effect.
Second time transformation, installed voltage dependent resistor (VDR) June nineteen ninety at TV bis-each windings, operation result shows, produces effects fair, but the problem of isolator operation TV bis-switch trips appears in occasional.
(2) failure condition of I bus TV
I bus TV once exploded, and reason is that secondary counter power transmission causes.
3, failure wave-recording inspection
According to fault oscillograph, the resolution of oscillograph is 100 times/cycle, record ripple figure is shown in Fig. 4, B phase voltage has the reason of fluctuation to be B phase switch trip in the graphic, but B phase ground connection still exists and causes viewed from load side, in addition, due to A, C phase electric capacity, after the tripping operation of TV P cock, its voltage still exists.B phase voltage
it is A phase voltage
c phase voltage
the result of dividing potential drop, phasor graph is shown in Fig. 5, and equation expression is as follows,
Equally, according to fault oscillograph, open-delta L phase transient voltage 44V, the time that transient state process maintains: 950ms.
4, the charged divide-shut brake dynamic test of disconnector
In order to confirm the possibility of TV secondary neutral N630, the short circuit of neutral point N640 instant earthing, whether the ripple of detection record simultaneously secondary neutral N630, neutral point N640 have superpotential phenomenon to occur, carried out the test of 204-1,204-2 disconnecting link opening and closing, measuring point is as follows.
Voltage measurement, first group: A phase voltage A630, B phase voltage B600, c phase voltage C630, neutral point voltage N630, residual voltage L630 are over the ground; Second group: A phase voltage A640, B phase voltage B600, c phase voltage C640, neutral point voltage N640, residual voltage L640 are over the ground.
Current measurement, first group: B phase current B601; Second group: B phase current B601 '.
(1) earth point is in the test of charged deciliter of position isolating switch and the inspection of record ripple on the spot
Earth point is when testing 204-1,204-2 disconnecting link opening and closing with regard to position, and terminal box place has the blue look arc light of electric discharge to occur, meanwhile, the dynamic indicator that record ripple detects is as following table:
Above data describe the density of disturbing pulse and the time continued roughly.Record ripple figure is shown in Fig. 6,7,8.
(2) earth point moves charged deciliter of front and back disconnector and the inspection of secondary switch trip situation
A, disconnection 1TV protect the test with switch F311 ground connection
Disconnect the ground connection of 1TV protection switch F311, by 1TV measurement with switch F411B phase ground connection, the test of operation 204-1 disconnecting link opening and closing, then switch F311 does not jump, and switch F411 trips;
B, increase 1TV measure the test with switch F411B phase earth point
Keep the ground connection of 1TV protection switch F311, by 1TV measurement with switch F411B phase ground connection, the test of operation 204-1 disconnecting link opening and closing, then switch F311 trips, and switch F411 trips.
C, phase earth point are away from the test of booster stations
Central station of floating dock beyond 100m is transferred to by switch gear room in the position of earth point, and Fig. 3 is shown in by schematic diagram.Carry out correlation test, switch TV no longer trips.
(3) test after neutral point to TV bis-grounding copper bars is increased
Increase the test findings after neutral point to TV bis-grounding copper bars, TV No. bis-switch still actions.
(4) experimental safe measure
In order to avoid the misoperation of protection during test, before above-mentioned test, take following measures: exit line backup protection; Exit the protection that generator is relevant to voltage; Exit the protection that transformer is relevant to voltage.
Three, the analysis of causes
According to test findings, analyze as follows.
1, TV secondary side three-phase voltage is normal
Under Test condition, TV secondary side three-phase voltage is normal, and secondary neutral N630, neutral point N640 do not have superpotential phenomenon to occur; Equally, there is not power frequency instantaneous short circuit fault in TV secondary side.
In principle, there is the possibility of instant earthing short circuit in TV secondary side neutral point N630, neutral point N640, such as, TV secondary neutral voltage dependent resistor (VDR) (non-linear resistance) feature damage in parallel then may cause neutral point N630, the short circuit of neutral point N640 instant earthing.But test findings shows, TV bis-not grounding phenomenon appearance, at neutral point N630, there is not power frequency short-circuit current between neutral point N640 with B phase B600 in the power frequency short trouble caused because of problem with grounding.That is TV bis-switch trips and short trouble have nothing to do.
2, high-frequency current acts on TV bis-switch trips
The superpotential formation of isolator operation and propagation are the keys of case study.
In electric system, it is routine operation that disconnector suits unloaded bus, and the operation of disconnector is all higher than the probability of other operation or earth fault etc.During isolator operation, contact translational speed is relatively slower, and this microinching makes produce when carrying out sub-switching operation between contact to restrike many times, can produce prebreakdown many times when closing operation.But disconnector does not generally all have special arc-control device, so once common operation just may produce the arc reignition of up to a hundred times.Time in addition due to isolator operation, isolating switch is all disconnect, and is therefore isolated the circuit that switch cut-offs general very short, and the catadioptric time of ripple is just very short, so the frequency that this superpotential occurs is very high, wave head is extremely steep.The fast transient process caused due to disconnector switching manipulation is obvious all especially compared with other situation.
Transient overvoltage conducts and radiation two kinds of forms being coupled with of secondary device.The mode that in Conduction coupling, transient overvoltage imports coupled secondary cable into by the stray capacitance of TV or TA inside and then enters secondary device is called capacitive coupling; Entered the screen layer of the secondary cable of ground connection by earth mat, and then sense that the mode of heart yearn of secondary cable is called Resistive Coupling.Radiation coupling is then that the electromagnetic field inducing that produced by metal shell is to secondary cable.Test shows, when carrying out switch operation, has high frequency superpotential phenomenon to produce, namely above-mentioned undesired signal.
The high-frequency coupling voltage of a switch operation generation absorbed by Non-linear pressure sensitive resistance, simultaneously, high-frequency current is created in relevant circuit, the loop that this electric current is formed by B phase TV No. bis-switches, ground wire and earth mats is flow through, TV bis-switch trips when its energy exceedes secondary switch trip amount.B phase ground connection keeps away Guan Zhanhou, and the impedance in high-frequency current loop increases, and electric current reduces, and secondary switch no longer trips.
If work frequency is f, higher frequency is nf, then high-frequency resistance value is nZ.
3, the analysis of protection act behavior
The action of protection is relevant with voltage.After the secondary P cock disconnection of TV, according to the voltage that the known protection of Fig. 3 detects be:
constant.
The distance protection acting characteristic equation of circuit:
In above formula, ZJ is distance protection measurement impedance; Z
awith Z
bfor distance protection setting impedance.
Acting characteristic is on a complex plane with+Z
awith-Z
b2 lines are the circle of diameter, see Fig. 9.
Back-up protection acting characteristic like this, when check point after loss of voltage just enters the active region of protection, if protection starts, can export tripping operation.
The difference of TV second breakdown insurance and voltage dependent resistor (VDR): voltage dependent resistor (VDR) has residual voltage, maintains certain numerical value.
4, conclusion
(1) problem of the tripping operation of TV No. bis-switches during switch operation and short trouble have nothing to do;
(2) problem and the ground connection of TV bis-P cocks tripping operation during switch operation, earth mat are relevant;
(3) switching overvoltage Producing reason is that arc reignition causes, and the index of consequent undesired signal is to inductance/capacitance-namely the transient state process of L/C circuit is relevant;
(4) #03 rise standby become run after the impact that produces very important, when playing switch operation after being run by change, earth potential raises higher than original;
(5) difference of TV second breakdown insurance and voltage dependent resistor (VDR): voltage dependent resistor (VDR) has residual voltage, maintains certain numerical value.
The several doubtful points proposed in phenomenon of the failure, can be answered by systems inspection and analysis, no longer describe at this.
Four, the precautionary measures
Advise that two buses have a power failure respectively, carry out the Correctness checking of circuit connection, the inspection of TV bis-ground connection situations, avoid again the superpotential produced during switch operation to cause TV No. bis-switch misoperations and relevant protection misoperation.
1, TV bis-three-phase linked switchs are replaced by split-phase switch
The switch that TV uses for bis-times three-phase to separate, the shnt capacitor of removing A, C phase;
2, the action index of TV No. bis-switches is improved
Improve the action index of TV bis-split-phase switch, make its quick-break action current be not less than 20pu;
3, high-frequency resistance value is increased
TV only retains an earth point bis-times; And earth point is moved to net control office, increased the high-frequency resistance value of bulk loop between TV No. bis-switches to B phase earth point by the position of mobile grounding point, confirm that corresponding power frequency impedance is not less than 1.6 Ω; Or the telefault ground connection of 1.6 Ω is not less than through power frequency impedance;
If work frequency is f, higher frequency is nf, then high-frequency resistance value is n × 1.6 Ω;
4, the numerical value of high-frequency current is suppressed
In conjunction with a upper measure, utilize the induction reactance of earth mat and plant area's cable to suppress high-frequency current, the Peak of current pulse produced when detecting the test of charged deciliter of disconnecting link is not more than 30A;
5, proper use of shielded cable
By screen layer reliable ground, be the shielding layer grounding of cable one end at present, should be two-terminal-grounding according to the rules; And according to the requirement of anti-accident measures, correctly install and use grounding copper bar between ground wire and grounded screen bis-times at TV.
6, proper use of voltage dependent resistor (VDR)
Ensure the correctness of voltage dependent resistor (VDR) parameter, confirm that the voltage of voltage dependent resistor (VDR) is 175V, and by ground connection that is direct for one end of voltage dependent resistor (VDR).
7, the mode of TV secondary neutral ground connection is changed
TV quadratic B phase ground connection is changed into the mode of neutral ground, the HF voltage produced during switch operation like this is just unlikely to form very strong high-frequency current in TV bis-switching circuitry, and causes its misoperation.
Operation result shows, above measure has only used first 5, and the switch operation interference of Huang Island power plant since 20 years is solved with switch mis-jumping problem.
Claims (1)
1. find the method that operation interference causes B phase ground connection TV bis-switch mis-jumping reasons; it is characterized in that: bus TV bis-switch trips when carrying out a switch operation; protection act; the dynamic test of the charged divide-shut brake of disconnecting link and relevant envelope test is carried out under the condition confirming TV quadratic B phase ground connection
(1) whether the Peak of current pulse produced when detecting the test of charged deciliter of disconnecting link is greater than 30A, and whether the probable range that electric current occurs is greater than 30 times/s, and whether the time of continuing current flow is greater than 500ms;
(2) detect secondary switch over the ground between power frequency input impedance whether be less than 0.1 Ω;
(3) whether the quick-break electric current detecting secondary switch is less than 10pu, and pu is the perunit value of electric current;
(4) whether the trip time detecting secondary switch is less than 100ms;
If the Peak of current pulse >30A produced during the disconnecting link opening and closing test detected, the probable range >30 time/s of appearance, lasting time >500ms; Secondary switch over the ground between power frequency input impedance be less than 0.1 Ω; The quick-break electric current of secondary switch is less than 10pu; The trip time of secondary switch is less than 100ms; and these 4 conditions exist simultaneously; just can determine to cause the reason of secondary switch motion be: in the loop that the high-frequency coupling voltage that switch operation produces is formed by B phase TV No. bis-switches, ground wire and earth mats, to create high frequency By Impulsive Current; the impulse density of this electric current meets secondary switch motion condition with the time continued; cause it to trip, and then make protection misoperation.
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