CN103337845B - Solve the method that switch operation interference causes B phase ground connection TV bis-switch trips - Google Patents
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Abstract
The present invention specifically discloses a kind of method solving switch operation interference and cause B phase ground connection TV bis-switch trips, comprises following measures: TV bis-three-phase linked switchs are replaced by split-phase switch by (1); (2) improve the action index of TV bis-split-phase switch, make its quick-break operating current be not less than 20pu, pu is perunit value; (3) utilize the induction reactance of earth mat and plant area's cable to suppress high-frequency current, increase the high-frequency resistance value of bulk loop between TV quadratic B phase switch to earth point, confirm that power frequency impedance corresponding to this loop is not less than 1.6 Ω; And the Peak of current pulse produced when making charged deciliter of 220kV isolation of system switch test is not more than 30A; (4) change earthing mode, change TV quadratic B phase ground connection into neutral point mode.
Description
Technical field
The present invention relates to a kind of method solving switch operation interference and cause B phase ground connection TV bis-switch trips, 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, power plant, Jining, Huang Tai power 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 January in this year, 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 processing method of fault for a long time.
Summary of the invention
The present invention is directed to the problem run in transformer station the switch operation interference occurred and cause TV bis-switch trips and distance protection misoperation, provide and a kind ofly can stop the measure by mistake of when switch operation TV bis-switch mis-jumpings, distance protection misoperation, equipment mistakenly stop and signal.
The technical solution used in the present invention is as follows:
Solve the method that switch operation interference causes B phase ground connection TV bis-switch trips, comprise following measures:
(1) TV bis-three-phase linked switchs are replaced by split-phase switch;
(2) improve the action index of TV bis-split-phase switch, make its quick-break operating current be not less than 20pu, pu is perunit value;
(3) utilize the induction reactance of earth mat and plant area's cable to suppress high-frequency current, increase the high-frequency resistance value of bulk loop between TV quadratic B phase switch to earth point, confirm that the power frequency impedance in this loop is not less than 1.6 Ω; And the Peak of current pulse produced when making charged deciliter of 220kV isolation of system switch test is not more than 30A;
(4) change earthing mode, change TV quadratic B phase ground connection into neutral point mode;
As long as above 4 measures play a role, just can solve the problem that switch operation interference causes B phase ground connection TV bis-switch trips, efficiently avoid false protection thus, switch mis-jumping, signal are sent out by mistake, the series of problems of unit mistakenly stop; Thus avoid the shock effect that equipment large-area power-cuts causes electrical network.Therefore, solving switch operation interference causes the validity of the method for B phase ground connection TV bis-switch trips to be confirmed.
The invention has the beneficial effects as follows: by proper use of piezo-resistance; Improve the action index of TV bis-split-phase switch; Utilize the induction reactance of earth mat and cable to suppress the measure of the numerical value of high-frequency current, effectively can prevent and solve switch operation to disturb the accident causing B phase ground connection TV bis-switch trips, transformer station's large-area power-cuts, thus the destabilizing factor of the few electrical network of increase and decrease.
Accompanying drawing explanation
Fig. 1, Huang Island power plant operational mode winding diagram;
The piezo-resistance 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 diagram;
Fig. 6, secondary current waveform during point isolating switch;
Fig. 7, secondary current waveform during conjunction isolating switch;
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 overvoltage 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 operating 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 overvoltage 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 type 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 piezo-resistance, 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 is not laid in power plant, does not more 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 piezo-resistance 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 in power 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 piezo-resistance (nonlinear resistance) parameter in parallel, the method for piezo-resistance external dc checks that its operation voltage is 175V; The design load of TV second breakdown insurance is 220V.
Power frequency operating 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 interference 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 piezo-resistance 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 diagram 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 process maintains: 950ms.
4, the charged divide-shut brake dynamic test of isolating switch
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 overvoltage 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 isolating switch 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 result of the test 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 result of the test, 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 overvoltage 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 piezo-resistance (nonlinear resistance) feature damage in parallel then may cause neutral point N630, the short circuit of neutral point N640 instant earthing.But result of the test 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 power system, it is routine operation that isolating switch suits unloaded bus, and the operation of isolating switch 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 isolating switch 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, circuit breaker 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 overvoltage occurs is very high, wave head is extremely steep.The fast transient process caused due to isolating switch switching manipulation is obvious all especially compared with other situation.
Temporary overvoltage conducts and radiation two kinds of forms being coupled with of secondary device.The mode that in Conduction coupling, temporary 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 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 overvoltage phenomenon to produce, namely above-mentioned interference 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, earth connection 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 operating characteristics equation of circuit:
In above formula, ZJ is distance protection measurement impedance; Z
awith Z
bfor distance protection setting impedance.
Operating characteristics is on a complex plane with+Z
awith-Z
b2 lines are the circle of diameter, see Fig. 9.
Backup protection operating characteristics like this, when test 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 piezo-resistance: piezo-resistance 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 interference signal is to inductance/capacitance-namely the transient 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 piezo-resistance: piezo-resistance 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 overvoltage 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 shunt 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 operating 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 inductance coil 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 type cable
By screen 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 earth connection and ground network bis-times at TV.
6, proper use of piezo-resistance
Ensure the correctness of piezo-resistance parameter, confirm that the voltage of piezo-resistance is 175V, and by ground connection that is direct for one end of piezo-resistance.
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 high frequency 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. solve the method that switch operation interference causes B phase ground connection TV bis-switch trips, it is characterized in that, comprise following measures:
(1) TV bis-three-phase linked switchs are replaced by split-phase switch;
(2) improve the action index of TV bis-split-phase switch, make its quick-break operating current be not less than 20pu, pu is perunit value;
(3) utilize the induction reactance of earth mat and plant area's cable to suppress high-frequency current, increase the high-frequency resistance value of bulk loop between TV quadratic B phase switch to earth point, confirm that power frequency impedance corresponding to this loop is not less than 1.6 Ω, and the Peak of current pulse produced when charged deciliter of 220kV isolation of system switch is tested is not more than 30A;
(4) change earthing mode, change TV quadratic B phase ground connection into neutral point mode;
As long as above 4 measures can play a role, just can solve the problem that switch operation interference causes B phase ground connection TV bis-switch trips, efficiently avoid false protection, switch mis-jumping, signal thus and send out and the series of problems of unit mistakenly stop by mistake; Thus avoid the shock effect that equipment large-area power-cuts causes electrical network.
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| EP0497752A2 (en) * | 1991-01-31 | 1992-08-05 | Felten & Guilleaume Austria Ag | Disconnection device for surge arresters |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2070510U (en) * | 1990-05-29 | 1991-01-30 | 刘必清 | Three-phase ac motor matched generator |
| EP0497752A2 (en) * | 1991-01-31 | 1992-08-05 | Felten & Guilleaume Austria Ag | Disconnection device for surge arresters |
| CN101435845A (en) * | 2008-12-15 | 2009-05-20 | 辽宁省电力有限公司锦州供电公司 | Small grounding current system double-loop wire single-phase ground fault distance measuring method |
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| Title |
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| 500kV刀闸操作故障分析;谢学武等;《中国电力》;20020531;第35卷(第5期);第51-56页 * |
| 基于拓扑原理解决母线差动保护闭锁方案;万君;《水电自动化与大坝监测》;20081020;第32卷(第5期);第38-41页 * |
| 隔离开关操作引起失灵保护误动的分析;毛为民;《电力系统自动化》;20020410;第26卷(第7期);第74-76页 * |
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