CN103337845A - Method for solving B phase grounding TV secondary switch trip caused by breaker operation interference - Google Patents
Method for solving B phase grounding TV secondary switch trip caused by breaker operation interference Download PDFInfo
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Abstract
The invention particularly discloses a method for solving B phase grounding TV secondary switch trip caused by breaker operation interference. The method comprises the following measures: (1) changing a TV secondary three-phase linkage switch into a split-phase switch; (2) improving the action indication of the TV secondary three-phase linkage switch, so as to enable the quick break action current to be no less than 20 pu, and pu means per unit value; (3) restraining the high-frequency current by utilizing inductive reactance of an earth screen and a factory cable, increasing the high-frequency resistance value of the entirety return circuit between the TV secondary B phase switch and the touch down point, affirming that the power frequency impedance corresponding to the return circuit is no less than 1.6 ohm; enabling the current pulse peak generated in 220 kv system isolation switch electrically charged splitting or integrating test to be not more than 30 A; (4) changing the grounding mode, that is, changing TV secondary B phase grounding mode into a neutral point mode.
Description
Technical field
The present invention relates to a kind of switch operation that solves and disturb the method that causes B phase ground connection TV secondary switch trip, belong to power system transformer substation resist technology field.
Background technology
The fault of bus TV secondary switch trip appearred in Huang Island power plant, power plant, Jining, Huang Tai power plant etc. when the several times switch operation successively occurring; and then cause the distance protection would trip of bus associated circuitry, transformer, cause the major accident of unit outage large-area power-cuts thus.
For example, after the 220kV of Huang Island power plant booster stations nineteen nineties puts into operation, the fault of TV secondary switch trip can appear when switch operation, taked some measures at that time after, keeping reluctantly and moving.Up to January in this year, when the operation disconnecting link, bus TV secondary load decompression, distance protection action, two accidents that the 220kV switch trips simultaneously take place repeatedly again.Obviously the hidden danger of the operation interference of disconnecting link and switch mis-jumping does not thoroughly solve, and the generation of accident has not only caused loss to power plant, has also injured the safe operation of electrical network.
Switch operation disturbs and causes the problem of B phase ground connection TV secondary switch trip very outstanding, though in the data before relevant report is arranged, the problem thinking of problem analysis and solution differs greatly.Be similar to and occur in the operation transformer station that above-mentioned example says, switch operation disturbs the problem that causes TV secondary switch trip 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 a switch operation that occurs in the operation transformer station and disturb the problem that causes TV secondary switch trip and distance protection misoperation, provide a kind of and can stop the measure that TV secondary switch mis-jumping, distance protection misoperation, equipment mistakenly stop and signal mistake are sent out when switch operation.
The technical solution used in the present invention is as follows:
Solve switch operation and disturb the method that causes B phase ground connection TV secondary switch trip, comprise following measure:
(1) TV secondary three-phase linked switch is replaced by split-phase switch;
(2) the action index of raising TV secondary split-phase switch makes its quick-break operating current be not less than 20pu, and pu is perunit value;
(3) utilize the induction reactance of earth mat and plant area's cable to suppress high-frequency current, increase TV quadratic B phase switch to the high-frequency resistance value of bulk loop between the earth point, confirm that the power frequency impedance in this loop is not less than 1.6 Ω; And make charged deciliter current impulse peak value that produces when testing of 220kV system isolating switch be not more than 30A;
(4) change earthing mode, change TV quadratic B phase ground connection into the neutral point mode;
As long as above 4 measures play a role, just can solve switch operation and disturb the problem that causes B phase ground connection TV secondary switch trip, avoided effectively thus that protection malfunction, switch mis-jumping, signal mistake are sent out, a series of problems of unit mistakenly stop; Thereby the shock effect of having avoided the equipment large-area power-cuts that electrical network is caused.Therefore, solving switch operation disturbs the validity of the method that causes B phase ground connection TV secondary switch trip to be confirmed.
The invention has the beneficial effects as follows: by correct use piezo-resistance; Improve the action index of TV secondary split-phase switch; Utilize the induction reactance of earth mat and cable to suppress the measure of the numerical value of high-frequency current, can effectively prevent and solve switch operation and disturb the accident that causes B phase ground connection TV secondary switch trip, transformer station's large-area power-cuts, thus the destabilizing factor of the few electrical network of increase and decrease.
Description of drawings
Fig. 1, Huang Island power plant operational mode winding diagram;
Fig. 2 (a), the piezo-resistance of bus TV secondary circuit wiring and the position of capacitor;
Fig. 2 (b), I bus TV secondary switch and numbering figure;
Fig. 2 (c), II bus TV secondary switch and numbering figure;
Fig. 3, the central station of floating dock schematic diagram is transferred to by the switch gear room in the position of earth point;
Fig. 4, secondary voltage waveform enlarged drawing during the tripping operation of #1TV P cock;
Fig. 5, AC phase voltage dividing potential drop phasor diagram;
Fig. 6 divides and keeps apart secondary current waveform when closing;
Fig. 7, secondary current waveform when closing isolating switch;
Fig. 8, secondary voltage waveform enlarged drawing during the tripping operation of #2TV P cock;
Fig. 9, the offset distance that contains round dot is protected operating characteristics.
Embodiment
Embodiment (be example with Huang Island power plant switch operation)
The present invention has analyzed and has solved the example that the switch operation interference causes B phase ground connection TV secondary switch trip, showed detection method in trouble-shooting, in the overvoltage of determining that switch operation produces, and superpotential transmission causes the reason of TV secondary switch trip and is setting up the work of doing aspect the rational index system.
Using 20MHz bandwidth oscillograph that the dynamic parameter of operation interference voltage, electric current has been carried out the record ripple at the scene detects; Static parameter of secondary circuit, switch etc. is tested; To the location problem relevant with stray capacitance, with the device problem of relating to parameters, analyze with the earth mat problem of structurally associated, thereby determined the reason of fault.
The reason of TV switch trip is not that the power frequency short circuit causes when confirming switch operation, but the electric current that is produced by High-frequency Interference has surpassed operating value I
DzCause; TV secondary switch breaking causes circuit distance protection decompression and moves, and forces line outage, compressor emergency shutdown.
One, phenomenon of the failure
On January 5th, 2009, the Huang Island power plant stops #4 machine operation no problem.January 13, high being equipped with, become when having a power failure operation, and the problems of two common tripping operations of bus TV secondary switches have taken place, and January 15, high being equipped with becomes when sending the electricity operation, the result with have a power failure consistent when operating.TV secondary switch trip has caused B phase dead electricity, and lock is chosen in two route protection misoperations.Afterwards disconnecting link 204-1 had been carried out repeatedly dividing, close test, and done the inspection of record ripple, and confirmed that finally TV secondary three-phase voltage was normal, secondary neutral N630, neutral point N640 do not have the overvoltage phenomenon to occur; The TV secondary does not have grounding phenomenon yet, not the power frequency short trouble that causes because of problem with grounding; Be that high-frequency current acts on TV secondary switch trip.This has been taked the corresponding precautionary measures: use shielded type cable; With shielding layer grounding; The TV secondary uses split-phase switch; Improved the action index of TV secondary split-phase switch; The TV secondary only keeps an earth point; Earth point is away from booster stations; Use ground connection copper bar etc.Operation result shows that the problem of TV secondary switch trip and route protection misoperation is resolved.So, solved the historical problem of leaving over before 20 years.Fig. 1 is seen in the wiring of Huang Island power plant system.The doubtful point that is worth analyzing has:
Doubtful point 1, the historical problem relevant with the age.January nineteen ninety, the TV secondary neutral added zinc oxide arrester, and in June, 90 secondary phase-splitting adds pressure-sensitive resistance, the record that the secondary switch trip was once arranged in 20 years afterwards, but very few.Two weeks comes in the recent period, carries out 6 times different operations, the problem of secondary switch trip has all taken place at every turn why.
Doubtful point 2, the space problem relevant with bus.Each secondary switch trip that occurs when all occurring in the operation of I bus, did not have tripping operation during the operation of II bus in the past, and was visible relevant with the locus of primary equipment.
Doubtful point 3 is with the earth mat problem of structurally associated.How the earth mat effect is worth research at present.Special-purpose ground connection copper bar is not laid in the power plant, and how about the copper bar that more not have ring to get up to connect is if lay behind the ground connection copper bar of special use effect.
Doubtful point 4, the plant issue relevant with protection.Circuit I, II protect misoperation, and circuit III is action not.
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
Fig. 2 is seen in the wiring of bus TV secondary circuit.
Fig. 2 (a), the position of piezo-resistance and capacitor is I bus TV secondary circuit wiring part, A601, B601, C601, L601, A630, B600, C630, L630, N630, Sa630 are the loop numbering; F311 is I bus TV second protection P cock; RD is fuse.
Fig. 2 (b) is the wiring of corresponding I bus TV secondary circuit, and A630 ', C630 ' are the loop numbering, and F321 is the metering P cock.
Fig. 2 (c) is the wiring of corresponding II bus TV secondary circuit, and A601 ', B601 ', C601 ', A640, B600, C640, N640 are the loop numbering, and F411 is the protection P cock; F421 is the metering P cock.
The scope of examination and result are as follows.
There is the multipoint earthing problem in the TV secondary, and all TV in power plant are ground connection on the spot all, and connecting line is arranged between the earth point, so causes multipoint earthing.
The configuration of TV secondary switch and parameter situation:
Protection is with the be in parallel capacitor of 2 * 4 μ F of TV secondary A, C;
Protection is with TV secondary A, B, the C three P cock rated current 3A that links;
Metering is with TV secondary A, B, the C three P cock rated current 5A that links;
The protection pattern C3 of TV secondary switch, characterisitic parameter sees the following form:
(2) action parameter such as secondary switch test
TV secondary three-phase star, delta windings piezo-resistance (nonlinear resistance) parameter in parallel, piezo-resistance checks that with the method for external dc its operation voltage is 175V; The design load of TV second breakdown insurance is 220V.
The power frequency operating current is 7 times of rated current, i.e. 7pu, t=80ms.
High-frequency current also can start the 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 measured relatively AC impedance from TV secondary connection terminal when diverse location, i.e. the interference signal AC impedance in loop of flowing through, and numerical value sees the following form.
| Electric parameter | The switch place is ground connection on the spot | The outer central station of floating dock place of TV100m 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 referring to Fig. 3.
2, the historical problem inspection of TV
The situation of (1) twice transformation
During initial design, the TV secondary neutral has been installed and has been punctured insurance, but the operation back punctures the frequent ground connection of insurance, causes the short circuit of B phase, switch trip.
Transform for the first time, installed one group of zinc oxide arrester January nineteen ninety in the TV secondary neutral, operation result shows, produces little effect.
Transform for the second time, installed piezo-resistance June nineteen ninety at each winding of TV secondary, operation result shows that it is fair to produce effects, but can occur the problem of isolator operation TV secondary switch trip once in a while.
(2) failure condition of I bus TV
I bus TV once exploded, and reason is that the anti-electricity that send of secondary causes.
3, failure wave-recording inspection
According to failure wave-recording figure as can be known, the resolution of oscillograph is 100 times/cycle, record ripple figure is seen Fig. 4, the reason of fluctuation is arranged is B phase switch trip to the B phase voltage in figure, but seeing from load side B phase ground connection still exists causes, in addition, owing to A, C phase electric capacity, its voltage of TV P cock tripping operation back still exists.The B phase voltage
It is the A phase voltage
The C phase voltage
The result of dividing potential drop, phasor diagram is seen Fig. 5, equation expression is as follows,
Equally, according to failure wave-recording figure as can be known, open-delta L phase transient voltage 44V, the time that transient process is kept: 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 have overvoltage phenomenon occur, carried out 204-1, the test of 204-2 disconnecting link opening and closing if detecting record ripple secondary neutral N630, neutral point N640 simultaneously, and 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 charged deciliter test of position isolating switch and the inspection of record ripple on the spot
Earth point is when the position is to 204-1, the test of 204-2 disconnecting link opening and closing on the spot, and the terminal box place has the blue look arc light of discharge to occur, simultaneously, and dynamic indicator such as following table that the record ripple detects:
Above data have been described the density and the time that continues of disturbing pulse roughly.Record ripple figure is seen Fig. 6,7,8.
(2) charged deciliter of isolating switch and the inspection of secondary switch trip situation before and after earth point moves
A, the disconnection 1TV protection test of switch F311 ground connection
Disconnect the 1TV protection with the ground connection of switch F311,1TV is measured with switch F411B phase ground connection, the test of operation 204-1 disconnecting link opening and closing, then switch F311 does not jump, switch F411 tripping operation;
B, increase 1TV measure the test with switch F411B phase earth point
Keep the 1TV protection with the ground connection of switch F311,1TV is measured with switch F411B phase ground connection the test of operation 204-1 disconnecting link opening and closing, then switch F311 tripping operation, switch F411 tripping operation.
C, phase earth point are away from the test of booster stations
100m central station of floating dock is in addition transferred to by the switch gear room in the position of earth point, and schematic diagram is seen Fig. 3.Carry out correlation test, switch TV no longer trips.
(3) increase the test of neutral point behind the TV secondary ground connection copper bar
Increase the result of the test of neutral point behind the TV secondary ground connection copper bar, TV secondary switch still moves.
(4) experimental safe measure
The misoperation of protection is taked following measure: withdraw from line backup protection during for fear of test before above-mentioned test; Withdraw from the generator protection relevant with voltage; Withdraw from the transformer protection relevant with voltage.
Three, the analysis of causes
According to result of the test, carry out following analysis.
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 the overvoltage phenomenon to occur; Equally, there is not power frequency instantaneous short circuit fault in the TV secondary side.
In principle, there are the possibility of instant earthing short circuit in TV secondary side neutral point N630, neutral point N640, for example, 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, the TV secondary does not have grounding phenomenon and occurs, and there is not the power frequency short circuit current in the power frequency short trouble that causes because of problem with grounding not between neutral point N630, neutral point N640 and B phase B600.That is to say that TV secondary switch trip and short trouble are irrelevant.
2, high-frequency current acts on TV secondary switch trip
The superpotential formation of isolator operation is the key of case study with propagating.
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, the contact translational speed is slower, and this microinching makes can produce many times when carrying out sub-switching operation between contact restrikes, and can produce prebreakdown many times when closing operation.Yet isolating switch does not generally all have special arc-control device, and so once common operation just may produce up to a hundred times arc reignition.During in addition owing to isolator operation, circuit breaker all disconnects, so the circuit that cut-off isolated pass is generally very short, and the catadioptric time of ripple is just very short, so the frequency that this overvoltage takes place is very high, wave head is extremely steep.Because the fast transient process that the isolating switch switching manipulation causes is all obvious especially than other situation.
Temporary overvoltage conducts and two kinds of forms of radiation being coupled with of secondary device.The mode that temporary overvoltage imports coupled secondary cable into by the stray capacitance of TV or TA inside and then enters secondary device in the conduction coupling is called the capacitive coupling; Enter the screen of the secondary cable of ground connection by earth mat, and then the mode of sensing the heart yearn of secondary cable is called resistive coupling.Radiation coupling then is that the electromagnetic field inducing that produces by metal shell is to secondary cable.Test shows when carrying out switch operation, have high frequency overvoltage phenomenon to produce, just above-mentioned interference signal.
The high-frequency coupling voltage of a switch operation generation is absorbed by non-linear piezo-resistance, simultaneously, produced high-frequency current in the relevant circuit, the loop stream mistake that this electric current forms by B phase TV secondary switch, earth connection and earth mat, TV secondary switch trip when its energy surpasses 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 the secondary switch no longer trips.
If work frequency is f, the high frequency frequency is nf, and then the high-frequency resistance value is nZ.
3, the analysis of protection action behavior
The action of protection is relevant with voltage.The secondary P cock of TV protects detected voltage to be according to Fig. 3 after disconnecting as can be known:
Constant.
The distance protection operating characteristics equation of circuit:
In the following formula, ZJ is that impedance is measured in distance protection; Z
AWith Z
BBe the distance protection setting impedance.
Operating characteristics on complex plane is with+Z
AWith-Z
B2 lines are the circle of diameter, see Fig. 9.
Backup protection operating characteristics like this is just test point enters the active region of protection behind loss of voltage, if protection has started then can export tripping operation.
The difference of TV second breakdown insurance and piezo-resistance: piezo-resistance has residual voltage, keeps certain numerical value.
4, conclusion
(1) problem of the tripping operation of TV secondary switch and short trouble are irrelevant during switch operation;
(2) problem of TV secondary P cock tripping operation and ground connection during switch operation, earth mat are relevant;
(3) reason that produces of switching overvoltage is that arc reignition causes, and the transient process of the index of consequent interference signal and inductance/capacitance-be L/C circuit is relevant;
(4) it is very important that #03 plays the influence that produces after the change operation fully, and a quilt becomes the original height of earth potential rising ratio when moving the back switch operation;
(5) difference of TV second breakdown insurance and piezo-resistance: piezo-resistance has residual voltage, keeps certain numerical value.
The several doubtful points that propose in phenomenon of the failure can both obtain answer by systems inspection and analysis, no longer narrate at this.
Four, the precautionary measures
Advise that two buses have a power failure respectively, carry out the correctness inspection of circuit connection, the inspection of TV secondary ground connection situation, the overvoltage that produces when avoiding again switch operation causes the switch misoperation of TV secondary and relevant protection misoperation.
1, TV secondary three-phase linked switch is replaced by split-phase switch
The switch that the TV secondary uses three-phase to separate is removed the shunt capacitor of A, C phase;
2, improve the action index of TV secondary switch
Improve the action index of TV secondary split-phase switch, make its quick-break operating current be not less than 20pu;
3, increase the high-frequency resistance value
The TV secondary only keeps an earth point; And earth point moved to net control office, the position by mobile earth point increases TV secondary switch to the high-frequency resistance value of bulk loop between the B phase earth point, confirms that corresponding power frequency impedance is not less than 1.6 Ω; Perhaps be not less than the inductance coil ground connection of 1.6 Ω through power frequency impedance;
If work frequency is f, the high frequency frequency is nf, and then the high-frequency resistance value is n * 1.6 Ω;
4, the numerical value that suppresses high-frequency current
In conjunction with a last measure, utilize the induction reactance of earth mat and plant area's cable to suppress high-frequency current, the current impulse peak value that produces when detecting charged deciliter test of disconnecting link is not more than 30A;
5, correctly use shielded type cable
With the 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, between TV secondary earth connection and ground network, correctly install and use the ground connection copper bar.
6, correctly use piezo-resistance
Guarantee the correctness of piezo-resistance parameter, confirm that the voltage of piezo-resistance is 175V, and with the direct ground connection of an end of piezo-resistance.
7, change the mode of TV secondary neutral ground connection
Change TV quadratic B phase ground connection the mode of neutral ground into, so the high frequency voltage that produces during switch operation just is unlikely to form very strong high-frequency current in TV secondary switch loop, and causes its misoperation.
Operation result shows that above measure has only been used preceding 5, and the switch operation of Huang Island power plant since 20 years disturbs with the switch mis-jumping problem and be solved.
Claims (1)
1. solve switch operation and disturb the method that causes B phase ground connection TV secondary switch trip, it is characterized in that, comprise following measure:
(1) TV secondary three-phase linked switch is replaced by split-phase switch;
(2) the action index of raising TV secondary split-phase switch makes its quick-break operating current be not less than 20pu, and pu is perunit value;
(3) utilize the induction reactance of earth mat and plant area's cable to suppress high-frequency current, increase TV quadratic B phase switch to the high-frequency resistance value of bulk loop between the earth point, confirm that the power frequency impedance of this loop correspondence is not less than 1.6 Ω; And make charged deciliter current impulse peak value that produces when testing of 220kV system isolating switch be not more than 30A;
(4) change earthing mode, change TV quadratic B phase ground connection into the neutral point mode;
As long as above 4 measures can play a role, just can solve switch operation and disturb the problem that causes B phase ground connection TV secondary switch trip, avoided effectively thus that protection malfunction, switch mis-jumping, signal mistake are sent out, a series of problems of unit mistakenly stop; Thereby the shock effect of having avoided the equipment large-area power-cuts that electrical network is caused.
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| CN111864551A (en) * | 2020-07-06 | 2020-10-30 | 国网宁夏电力有限公司检修公司 | Main wiring structure of transformer substation |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111864551A (en) * | 2020-07-06 | 2020-10-30 | 国网宁夏电力有限公司检修公司 | Main wiring structure of transformer substation |
| CN111864551B (en) * | 2020-07-06 | 2024-05-17 | 国网宁夏电力有限公司检修公司 | Main wiring structure of transformer substation |
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