CN105954673B - High-voltage AC breaker arcing time measuring system and method - Google Patents
High-voltage AC breaker arcing time measuring system and method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The present invention discloses a kind of high-voltage AC breaker arcing time measuring system and method, utilize divider, current transformer, the measurement acquisition system of the compositions such as instantaneous waveform recorder, later period optimization processing is carried out to Wave data by Data Analysis Software, it eliminates or is substantially reduced due to ratio error, zero drift, error interference caused by electronic digit noise etc. is horizontal, significantly increase the resolvability of the arc voltage component of only some tens of volts, utilize step feature of the arc voltage component before and after arcing, from starting and the finish time for restoring to demarcate the transition of arc voltage component on voltage waveform, the purpose that the realization arcing time accurately measures.
Description
Technical field
The present invention relates to a kind of high-voltage AC breaker arcing time measuring system and methods, belong to the defeated change of electric system and match
Electro-technical field.
Background technique
It carves from the rigid timesharing of contact of breaker to current over-zero and ceases when arcing time is AC high-voltage switchgear drop-out current
At the arc moment, electric current exists in switch arc-chutes with arc shape at this stage.1984-2014 " high-voltage AC breaker " mark
The high-voltage AC breaker breaking test of alignment request requires mostly in longest, most short arcing time and when longest, most short arcing
Between between as required interval carry out breaking test, by three-phase condenser bank current breaking test requirement for, it is desirable that test side
Formula BC2 is as follows:
--- 4 CO are distributed in a polarity (step-length: 15 °)；
--- 32 CO, the most short arcing time in a polarity；
--- 4 CO are distributed in another polarity (step-length: 15 °)；
--- 32 CO, the most short arcing time in another polarity；
--- remaining test, which should reach, amounts to 80 CO, is uniformly distributed (step-length: 15 °)
Above-mentioned requirements are required to survey or be expected arcing time, the step-length of precision and requirement (15 ° are equivalent to 0.833 millisecond)
Match.It therefore is to carry out the requirement and premise of high-voltage AC breaker breaking test to the precise measurement of arcing time.
The measurement of high-voltage AC breaker interrupting process arcing time is very difficult, can not directly measure, can only by
The mode of connecing obtains.It opening time (separating brake instruction issue moment to current over-zero cut-off the moment) is usually taken subtracts breaker and divide admittedly
Time (separating brake instruction issues moment to the rigid timesharing of contact of breaker and carves) obtains.It is actual measurement that this method, which only has opening time,
Gu practical just timesharing quarter is not grasped by preset as constant between timesharing.And actually consolidate timesharing between by actuating mechanical mechanism, point
The factors such as the lock same period, opening coil voltage influence, and are unstable, dispersions, and due to mechanism bite under individual cases, Gu
There is opening time significantly to extend, therefore is uncontrolled using this method there are large error and uncertainty.
Another way is the space magnetic field signal generated using arc current, when on-line determination breaker drop-out current
The starting the arc moment.This method is although feasible but can only measure the arcing time that contact first opens phase, needs to assume three-phase in practical application
The disjunction same period, which results in biggish errors, and are unable to three-phase and independently measure.
For low tension switch, voltage can be restored by directly measuring fracture, closed a floodgate by switch --- contact has just divided
When arc --- zero passage ceases arc, corresponding fracture restores voltage and normally restores electricity from zero --- arc voltage (typically up to some tens of volts) ---
The jumping characteristic of (hundreds of volts) is pressed, it is very convenient, simply measure the arcing time.
But for AC high-voltage switchgear breaking test, the arcing time is difficult to survey by the measuring system routinely configured
It is fixed.By taking 10kV AC high voltage vacuum breaker cut-offs capacitor group current testing as an example, the range of high-voltage bleeder measuring system
According to the expected maximum transient recovery voltage adjusting for being likely to occur switching overvoltage, range representative value reaches 100kV, divider essence
Spending representative value is 0.5%, and the fracture that difference obtains restores voltage, and only divider ratio error can reach 1%(2*0.5%), i.e.,
Only systematic error caused by no-load voltage ratio may be up to 1000V, further include that zero drift, electronic digit noise, lead impedance cause
Voltage drop error etc., theoretically restoring the combined floodgate stage that voltage is zero also will appear at least hundreds of volts of interference level, and
It is thorough by the interference level of up to decades of times to restore arc voltage component in voltage for arc stage arc voltage only 20 volts
Bottom is flooded, and can not distinguish transition characteristic point, therefore conventional measuring systems and method can not measure high-voltage AC breaker and cut-off examination
Test the arcing time.
In view of this, the present inventor studies this, a kind of high-voltage AC breaker arcing time survey is specially developed
System and method is measured, thus this case generates.
Summary of the invention
The object of the present invention is to provide a kind of high-voltage AC breaker arcing time measuring system and methods, when realizing arcing
Between accurate measurement.
To achieve the goals above, solution of the invention is:
High-voltage AC breaker arcing time measuring system, including high-voltage AC breaker, the high-voltage AC breaker
Bus bar side (source side) is equipped with bus bar side divider over the ground, and the high-voltage AC breaker load-side is equipped with load-side over the ground
Divider, the high-voltage AC breaker, which is installed in series, current transformer, the bus bar side divider, load-side divider,
Current Transformer Secondary side is connect with digital instantaneous waveform recorder, is divided by instantaneous waveform recorder acquisition and recording bus bar side
The bus bar side voltage-to-ground signal U that device providesm, load-side divider provide load-side voltage-to-ground signal Uc, current transformer
The high-voltage AC breaker current signal I of offerc。
High-voltage AC breaker arcing time measurement method, includes the following steps:
1) acquire initial data for the first time: high-voltage test loop band normal assays voltage, test product high-voltage AC breaker carry out
Operation and wave recording acquisition are cut-off for the first time, obtain bus bar side voltage Um, load side voltage Uc, high-voltage AC breaker electric current Ic
Wave data object；
2) digital smoothness: the Functional Analysis function of being provided using Data Analysis Software, using digital smoothness function
SmoothedSignal(), to acquired bus bar side voltage Um, load side voltage UcData object carries out digital smoothness calculating,
Appropriate smoothing parameter N is chosen, the bus bar side voltage Smooth(U after obtaining digital smoothness optimizationm), load side voltage Smooth
(Uc) data object:
Smooth(Um)=SmoothedSignal(Um, N) and (1)
Smooth(Uc)=SmoothedSignal(Uc, N) and (2)
Preferably, smoothing parameter range described in step 2 are as follows: 2≤N≤10；
3) calculating is repaired in zero-bit drift: to the bus bar side voltage Smooth(U of above-mentioned acquisitionm), load side voltage Smooth(Uc) wave
Graphic data is suitably shown, combined floodgate steady-state process integral multiple power frequency period data segment is chosen, and is provided using data software flat
Mean function Mean () is calculated separately and is obtained bus bar side voltage Um, load side voltage UcZero drift correction value Um0、Uc0:
Um0=Mean(Um) (3)
Uc0=Mean(Uc) (4)
4) zero drift is corrected: to the bus bar side voltage Smooth(U of above-mentioned acquisitionm), load side voltage Smooth(Uc) number
According to object, the zero drift correction value U of above-mentioned acquisition is individually subtractedm0、Uc0, obtain the bus bar side after zero drift amendment optimizes
Voltage Formula (Um), load side voltage Formula (Uc) data object:
Formula(Um)=Smooth(Um)-Um0(5)
Formula(Uc)=Smooth(Uc)-Uc0(6)
5) ratio correction of transformation coefficient k is calculated: to the bus bar side voltage Formula (U of above-mentioned acquisitionm), load side voltage
Formula(Uc) Wave data suitably shown, a certain wave crest of combined floodgate steady-state process is chosen, it is used in same time scale
Cursor reads bus bar side voltage peak U respectivelymmax, load side voltage peak value Ucmax, or max function is used, it chooses with for the moment
Between range include a wave crest data segments, calculate obtain maximum value, with bus bar side voltage peak UmmaxOn the basis of, it calculates negative
Carry side voltage change ratio correction coefficient k:
k = Ummax / Ucmax(7)
6) ratio correction of transformation is carried out: to load side voltage Formula (Uc) data object, multiplied by load side voltage ratio correction of transformation
Coefficient k obtains the load side voltage Formula2 (U after ratio correction of transformationc) data object:
Formula2(Uc) = k * Formula(Uc) (8)
7) the recovery voltage data object after difference is optimized: to the bus bar side voltage Formula (Um) of above-mentioned acquisition
Data object subtracts load side voltage Formula2 (Uc) data object of above-mentioned acquisition, carries out Difference Calculation, and it is high to obtain test product
Recovery voltage data object Formula (U after pressing AC circuit breaker optimizationf):
Formula(Uf) = Formula(Um) - Formula2(Uc) (9)
8) Calibrated current zero passage ceases arc moment t1: voltage data object Formula is restored to above-mentioned high-voltage AC breaker
(Uf) waveform, high-voltage AC breaker is chosen by closing a floodgate to separating brake proper range data segment, to recovery voltage Formula (Uf) into
Row sufficiently amplification display when ceasing arc according to high-voltage AC breaker current over-zero, restores voltage and significantly rises to from close to zero
Restoring voltage Formula (U to high levelf) on waveform, it is high-voltage AC breaker electricity that demarcation signal, which significantly rises to starting point,
Flow through zero breath arc moment t1(to increase intuitive, high-voltage AC breaker current signal can be cooperated to carry out display calibration, Ying Yugao
Press the AC circuit breaker current over-zero breath arc moment consistent)；
9) t is carved in the rigid timesharing of calibration contact2: arc moment t is ceased in the calibration current over-zero1Afterwards, to recovery voltage data pair
As Formula (Uf), choose several ms before the calibrated high-voltage AC breaker current over-zero breath arc momentRangeIt is main
Display area (matches) with the respective circuit breakers theoretical maximum arcing time, carries out sufficiently amplification display.It is disconnected according to high-voltage alternating
When road device contact has just divided the starting the arc, restores characteristic of the voltage from zero (theoretical value) transition to arc voltage level and (go out with breaker
Arc mechanism is related to current value, cut-offs hundreds of Ampere currents, about 20 volts of representative value for vacuum circuit breaker), it is marking
Before the fixed high-voltage AC breaker current over-zero breath arc moment in tens of milliseconds ranges, demarcation signal obviously has whole some tens of volts
The starting point of transition is that t is carved in the rigid timesharing of high-voltage AC breaker contact2；
10) arcing time T is calculatedarc: high-voltage AC breaker current over-zero is ceased into arc moment t1T is carved with the rigid timesharing of contact2
Subtract each other, i.e. acquisition arcing time measured value:
Tarc= t1 - t2(10)
11) single-phase to high-voltage AC breaker or three-phase test, can be used above-mentioned steps, measure each phase arcing respectively
Time.
Preferably, measuring subsequent any secondary breaking test arcing time, can directly be obtained using survey calculation for the first time
Zero drift correction value U0, load side voltage ratio correction of transformation coefficient k (without redeterminating every time), direct editing such as minor function
Expression formula carries out zero drift amendment, ratio correction of transformation and digital smoothness, the recovery voltage signal Formula after being optimized
(Uf), carry out arcing time measurement:
Formula(Uf)=SmoothSignal((Um-Um0)-k*(Uc-Uc0), N) (11).
Preferably, to the voltage signal comprising larger harmonic content, it is contemplated that increase digital filtering, utilize digital filtering
Function, reducing harmonic wave influences.
Preferably, zero drift correction value, load side voltage correction coefficient only need to calculate once after testing acquisition for the first time,
It to subsequent any secondary breaking test, can directly utilize, without surveying again.
Preferably, above-mentioned high-voltage AC breaker arcing time measurement method, it can be by having the number of corresponding analysis function
Word formula instantaneous waveform recorder direct-on-line or determined off-line, or by having corresponding function Data Analysis Software, surveyed offline
It is fixed.
A kind of high-voltage AC breaker arcing time measuring system and method for the present invention, utilize divider, electric current
The measurement acquisition system of the compositions such as mutual inductor, instantaneous waveform recorder carries out the later period to Wave data by Data Analysis Software
The error interference water as caused by ratio error, zero drift, electronic digit noise etc. is eliminated or be substantially reduced to optimization processing
It is flat, the resolvability of the arc voltage component of only some tens of volts is significantly increased, rank of the arc voltage component before and after arcing is utilized
Jump feature, from starting and the finish time for restoring to demarcate the transition of arc voltage component on voltage waveform, realizes that the arcing time is accurate
The purpose of measurement.
Below in conjunction with drawings and the specific embodiments, the invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the high-voltage AC breaker arcing time measuring system test loop schematic diagram of the present embodiment；
Fig. 2 is the high-voltage AC breaker breaking test waveform diagram for the first time of the present embodiment；
U in figurema、Umb、Umc: three-phase bus side voltage-to-ground signal waveform
Ica、Icb、Icc: three-phase bus side voltage-to-ground signal waveform
Uca、Ucb、Ucc: threephase load side voltage-to-ground signal waveform
Ufa、Ufb、Ufc: test product high-voltage AC breaker three-phase fracture restores waveform voltage signal (Um、UcDifference generates)；
Fig. 3 is the high-voltage AC breaker A phase current of the present embodiment, restores voltage oscillogram；
Fig. 4 is that A phase restores partial enlarged view before and after voltage separating brake in Fig. 2；
Fig. 5 is that A phase restores the abundant enlarged drawing in part before and after voltage separating brake in Fig. 2；
Fig. 6 is that the present embodiment zero drift revise signal chooses figure:
Fig. 7 is that the ratio correction of transformation data of the present embodiment select figure；
Fig. 8 is that the fracture of the present embodiment optimization restores voltage Formula(Ufa) waveform diagram；
Fig. 9 is that the present embodiment fracture restores voltage Formula(Ufa) waveform diagram (waveform 1)；
Figure 10 is that the present embodiment fracture restores voltage Formula(Ufa) waveform diagram (waveform 2)；
Figure 11 is that the present embodiment demarcates contact zero passage breath arc moment t1；
Figure 12 is that the present embodiment demarcates contact rigid timesharing quarter t2；
Figure 13 is that the present embodiment restores to compare figure before and after voltage optimization；
Figure 14 is that the present embodiment restores to compare figure (partial enlargement) before and after voltage optimization.
Specific embodiment
The present embodiment 1 carries out AC high voltage vacuum with power industry reactive compensation complete device quality inspection test center and breaks
Road device 400A opens and closes capacitor group electric current switching test measurement arcing time example back-to-back.
A kind of high-voltage AC breaker arcing time measuring system provided in this embodiment, test loop schematic diagram such as Fig. 1
It is shown, including test product high-voltage AC breaker 1, the high-voltage AC breaker bus bar side (source side) be equipped with bus bar side over the ground
Divider 2, the high-voltage AC breaker load-side are equipped with load-side divider 3 over the ground, and the high-voltage AC breaker 1 is gone here and there
Connection is equipped with current transformer 4, the bus bar side divider 2, load-side divider 3,4 secondary side of current transformer with it is digital
Instantaneous waveform recorder 5 connects, the bus bar side voltage-to-ground provided by 5 acquisition and recording bus bar side divider of instantaneous waveform recorder
Signal Um, load-side divider provide load-side voltage-to-ground signal Uc, current transformer provide high-voltage AC breaker electricity
Flow signal Ic。
This example test product high-voltage AC breaker 1 is 10kV vacuum circuit breaker, bus bar side divider 2, load-side divider 3
It is for RC divider, range 50kV, no-load voltage ratio 10000/1；Current transformer 4 is electromagnetic current transducer, no-load voltage ratio 600/
5A；Digital 5 sample frequency 100k/s of instantaneous waveform recorder, Data Analysis Software imPRESSion.
A kind of high-voltage AC breaker arcing time measurement method provided in this embodiment, using above-mentioned high-voltage alternating open circuit
Device arcing time measuring system takes following steps for measuring the A phase arcing time (other two-phases are similarly):
1, measuring signal is obtained and is acquired
High-voltage AC breaker 1(test product switch) bus bar side is installed with bus bar side divider 2, it is obtained from bus bar side divider 2
Take bus bar side voltage-to-ground signal Um, load-side is installed with load-side divider 3, from the acquisition load-side pair of load-side divider 3
Ground voltage signal Uc, it is in series with current transformer 4 with high-voltage AC breaker 1, obtains high-voltage alternating open circuit from current transformer 4
1 current signal I of devicec, by 5 acquisition and recording bus bar side voltage-to-ground signal U of transient digital recorderm, load-side voltage-to-ground signal
Uc, 1 current signal I of high-voltage AC breakercWave data is shown by Data Analysis Software, handles and analyze recorded waveform number
According to.
The normal wiring of high-voltage test loop band, under normal assays voltage and test method, test product high-voltage AC breaker 1
Breaking test operation for the first time and wave recording are carried out, bus bar side voltage U is obtainedm, load side voltage Uc, high-voltage AC breaker electricity
Flow IcWave data object, is shown in Fig. 2.
To Uma、UcaThe A phase fracture that difference generates restores voltage signal UfaPart sufficiently amplification is carried out before and after the separating brake moment
It has been shown that, as Fig. 3, Fig. 4, Fig. 5 (to increase intuitive, restore voltage signal and inphase current signal cooperated to show).It can be with from Fig. 5
Find out, during high-voltage AC breaker closes a floodgate, theoretical value should be the recovery voltage of zero, more than 200 volts of interference level occurs
(measurement error).Through analyzing, above-mentioned interference level is mainly by divider ratio error, electronic measurement system zero drift, number
All multisystems, the random errors such as noise, connecting line impedance voltage drop cause, and high-voltage AC breaker is in arc stage arc voltage
Only 20 volts, arc voltage ingredient are disturbed level and thoroughly flood, can not be faint from restoring to identify in voltage signal
Arc voltage transition feature, therefore can not carry out that the rigid timesharing blaze of contact is fixed and arcing time measurement.
2, signal later period optimization processing
Effectively to identify faint arc voltage signal from recovery voltage signal, it is necessary to eliminate or be substantially reduced measurement
The error magnitude of system, thus using data smoothing, zero drift amendment, ratio error correction, difference generates the recovery of optimization
Voltage signal, the specific steps are as follows:
2.1 digital smoothness
Digital smoothness is carried out first: to A phase bus bar side voltage Uma, load side voltage UcaData object, using digital smoothness
Function SmoothedSignal(), it chooses between appropriate smoothing parameter N(substantially 2~10, it is generally desirable 4) to carry out data smoothing,
It is substantially reduced random error caused by electronic noise, the bus bar side voltage Smooth(U after generating new smooth optimizationma), load
Side voltage Smooth(Uca) data object, example is using smoothing parameter 6:
Smooth(Uma)=SmoothSignal (Uma, 6) and (1)
Smooth(Umc)=SmoothSignal (Umc, 6) and (2)
2.2 calculate zero drift
To the bus bar side voltage Smooth(U after smooth optimizationma), load side voltage Smooth(Uca) data object, with suitable
When ratio is shown.
In high-voltage AC breaker combined floodgate steady-state process data area, integral multiple (at least one) power frequency week is chosen with cursor
Phase voltage waveform data section is shown in Fig. 6 (between vertical cursor cursor1, cursor2,1 complete cycle).
Using mean function Mean(), arithmetic average is calculated to data between bus bar side, load side voltage signal cursor
Value obtains bus bar side, load-side A phase voltage signal zero drift value Uma0、Uca0, exampleUma0、Uca0Are as follows:
Uma0 = Mean(Uma[10235,12235], MEAN_ARITHMETIC)=17.0 (3)
Uca0 = Mean(Uca[10236,12235], MEAN_ARITHMETIC)=8.0 (4)
2.3 zero drifts amendment
To the bus bar side voltage Smooth(U after smooth optimizationma), load side voltage Smooth(Uca) data object, it utilizes
The zero drift value of above-mentioned acquisition carries out zero drift amendment, obtains the revised bus bar side voltage data of new zero drift
Object Formula (Uma), load side voltage data object Formula (Uca):
Formula(Uma)=Smooth(Uma) -17.0 (5)
Formula(Uca)=Smooth(Uma) -8.0 (6)
2.4 no-load voltage ratio correction factors calculate
Bus bar side voltage data object Formula (U revised to above-mentioned zero driftma), load side voltage data pair
As Formula (Uca), suitably shown.In high-voltage AC breaker combined floodgate steady-state process data area, with cursor selection one
A wave crest reads peak value with cursor and (or uses max function, including wave crest interval computation maximum point at the same time is upper
Value).Example uses cursor direct-reading, obtains bus bar side voltage peak Ummax, load side voltage peak value Ucmax, see Fig. 7.
Ummax=8569.0 (7)
Ucmax=8379.7 (8)
2.5 computational load side voltage change ratio correction coefficient k
Using crest voltage method, with bus bar side voltage peak UmmaxOn the basis of, computational load side voltage change ratio correction coefficient
K, example k are as follows:
k=Ummax/Ucmax=8569.0/8379.7=1.0226 (9)
2.6 pairs of load side voltages carry out ratio correction of transformation
With the ratio correction of transformation coefficient k of above-mentioned acquisition, ratio correction of transformation, function expression are carried out to load side voltage are as follows:
k * Formula(Uca) (10)
2.7 difference generate the fracture after optimization and restore voltage
To the bus bar side voltage Formula (U after above-mentioned optimizationma), load side voltage k * Formula (Uca) carry out it is poor
Point, the A phase after obtaining final optimization pass restores voltage signal Formula(Ufa) data object, difference function expression formula are as follows:
Formula(Ufa)=Formula (Uma)- k * Formula(Uca) (11)
A phase after final optimization pass is restored into voltage signal Formula(Ufa) data object, amplification shows (A in appropriate proportions
Phase current signal cooperation display, increases intuitive), see Fig. 8.
2.8 Calibrated current zero passages cease arc moment t1
To the recovery voltage data object Formula(U after Fig. 8 optimizationfa) waveform, the proper range number before and after the separating brake moment
Sufficiently amplification display (high-voltage AC breaker current signal can cooperate display) is carried out according to section, sees Fig. 9, Figure 10.It is handed over according to high pressure
When flowing circuit breaker current zero passage breath arc, restore the height electricity that voltage significantly rises to tens of kilovolts or more from the small level close to zero
Flat characteristic,(Voltage level after rising to cut-offs, normally cut-offs and occurs according to different voltages grade, load of different nature
The different situations such as switching overvoltage are all different, but are the high level for rising at least tens of kilovolts always, normally to cut-off
For 10kV shunt capacitor group, about 20kV will be risen to from close to zero volt by restoring voltage) restoring voltage Formula(Ufa)
On waveform signal, it is that high-voltage AC breaker current over-zero ceases arc moment (cursor and yellow that demarcation signal, which significantly rises to starting point,
At label instruction, it is consistent the arc moment should to be ceased with high-voltage AC breaker current over-zero), direct-reading current over-zero ceases arc moment t1, see
Figure 11:
t1=0.13726 s (12)
T2 is carved in the 2.9 rigid timesharing of calibration contact
Calibrated current zero passage ceases arc moment t1Afterwards, to recovery voltage data object Formula(Ufa) waveform, it chooses and has demarcated
High-voltage AC breaker current over-zero breath the arc moment before tens of milliseconds ranges (range is related to the arcing time, different type
Breaker differs greatly, and normally cut-offs and also differs greatly under abnormal conditions, in general 10 milliseconds of vacuum circuit breaker, SF6 open circuit
In general 30 milliseconds of device)
(match with the respective circuit breakers theoretical maximum arcing time) for primary display area, carries out sufficiently amplification display.
According to the rigid timesharing of high-voltage AC breaker contact, restore voltage from zero (theoretical value) transition to arc voltage level (with open circuit
Device arc extinguishing mechanism is related to current value, cut-offs hundreds of Ampere currents, representative value about some tens of volts for vacuum circuit breaker), it is marking
Before the fixed high-voltage AC breaker current over-zero breath arc moment in tens of milliseconds ranges, demarcation signal obviously has whole some tens of volts
The starting point of transition is the rigid branch moment t of high-voltage AC breaker contact2(at left vertical cursor cursor and yellow label instruction),
T is carved in the rigid timesharing of direct-reading contact1, see Figure 12.
t1=.0.13502 s (13)
3, arcing time Tarc is measured
Difference calculating (or direct-reading) is carried out to contact zero passage breath arc moment t1 and contact rigid branch moment t2, i.e. acquisition arcing
Time Tarc:
Tarc=t1-0.13502=0.00224 s of-t2=0.13726=2.24ms (15)
I.e. actual measurement A phase secondary separating brake process practical arcing time is 2.24 milliseconds.
Using same step, B phase is measured, the C phase arcing time is respectively 7.16 milliseconds, 7.16 milliseconds.
4, subsequent arcing time measurement
Zero drift correction value Um0、Uc0, load side voltage ratio correction of transformation coefficient k carried out when need to only test for the first time calculate obtain
It takes, to subsequent any secondary breaking test, utilizes the zero drift correction value U for testing acquisition for the first timem0、Uc0And load side voltage
Ratio correction of transformation coefficient k, the following function expression of direct editing carry out zero drift amendment, ratio correction of transformation and digital smoothness, obtain
Recovery voltage signal Formula(U after optimizationfa), carry out arcing time measurement:
Formula(Uf)=SmoothSignal ((Um- U) -1.0226*(Uc- 8.0)) (15)
5, restore voltage waveform optimization front and back to compare
Restore voltage original signal UfaAnd the signal Formula(U after optimizationfa) compare and see Figure 13, Figure 14.
Before optimization, original signal UfaSince error interference level (more than 200 volts) substantially exceeds faint arc voltage water
Flat (20V or so), the transition feature for restoring arc voltage ingredient in voltage are thoroughly flooded, can not be differentiated.
After optimization, error interference level is significantly reduced, and the transition feature of arc voltage ingredient is effectively highlighted, be may be implemented
Arcing time accurately measures.
6, arcing time measurement accuracy σ:
Example Sampling time periods T=0.01ms, digital smoothness function smoothing parameter are 6, arcing time measurement accuracy σ
σ≤(1+N) * T=(1+6) * 0.01=0.07ms (16)
Measurement accuracy is that 0.07 ms(is equivalent to 1.0 °), far superior to common measurement method (2ms or so).
A kind of high-voltage AC breaker arcing time measuring system and method described in the present embodiment, are divided using bus bar side
The measurement acquisition system of the compositions such as device 2, load-side divider 3, current transformer 4 and digital instantaneous waveform recorder 5, passes through
Data Analysis Software carries out later period optimization processing to Wave data, eliminates or is substantially reduced due to ratio error, zero drift, electricity
Error interference caused by subnumber word noise etc. is horizontal, significantly increases the resolvability of the arc voltage component of only some tens of volts, benefit
With step feature of the arc voltage component before and after arcing, the starting of arc voltage component transition is demarcated from recovery voltage waveform
And finish time, the purpose that the realization arcing time accurately measures
Above-described embodiment and schema and non-limiting product form and style of the invention, any technical field it is common
The appropriate changes or modifications that technical staff does it all should be regarded as not departing from patent category of the invention.
Claims (6)
1. high-voltage AC breaker arcing time measurement method, it is characterised in that include the following steps:
Acquire initial data for the first time: high-voltage test loop band normal assays voltage, test product high-voltage AC breaker are opened for the first time
Disconnected operation and wave recording, obtain bus bar side voltage Um, load side voltage Uc, high-voltage AC breaker electric current IcWave data pair
As；
Digital smoothness: the Functional Analysis function of being provided using Data Analysis Software, using digital smoothness function
SmoothedSignal(), to acquired bus bar side voltage Um, load side voltage UcData object carries out digital smoothness calculating,
Appropriate smoothing parameter N is chosen, the bus bar side voltage Smooth(U after obtaining digital smoothness optimizationm), load side voltage Smooth
(Uc) data object:
Smooth(Um)=SmoothedSignal(Um, N) and (1)
Smooth(Uc)=SmoothedSignal(Uc, N) and (2)
Calculating is repaired in zero-bit drift: to the bus bar side voltage Smooth(U of above-mentioned acquisitionm), load side voltage Smooth(Uc) Wave data
It is suitably shown, chooses combined floodgate steady-state process integral multiple power frequency period data segment, the average value letter provided using data software
Number Mean () calculates separately and obtains bus bar side voltage Um, load side voltage UcZero drift correction value Um0、Uc0:
Um0=Mean(Um) (3)
Uc0=Mean(Uc) (4)
Zero drift amendment: to the bus bar side voltage Smooth(U of above-mentioned acquisitionm), load side voltage Smooth(Uc) data pair
As the zero drift correction value U of above-mentioned acquisition is individually subtractedm0、Uc0, obtain the bus bar side voltage after zero drift amendment optimizes
Formula(Um), load side voltage Formula (Uc) data object:
Formula(Um)=Smooth(Um)-Um0(5)
Formula(Uc)=Smooth(Uc)-Uc0(6)
Calculate ratio correction of transformation coefficient k: to the bus bar side voltage Formula (U of above-mentioned acquisitionm), load side voltage Formula (Uc)
The Wave data of data object is suitably shown, one wave crest of combined floodgate steady-state process is chosen, and uses cursor in same time scale
Bus bar side voltage peak U is read respectivelymmax, load side voltage peak value Ucmax, with bus bar side voltage peak UmmaxOn the basis of, it calculates
Load side voltage ratio correction of transformation coefficient k:
k = Ummax / Ucmax(7)
Carry out ratio correction of transformation: to load side voltage Formula (Uc) data object, multiplied by load side voltage ratio correction of transformation coefficient k,
Obtain the load side voltage Formula2 (U after ratio correction of transformationc) data object:
Formula2(Uc) = k * Formula(Uc) (8)
Difference optimized after recovery voltage data object: to bus bar side voltage Formula (Um) data pair of above-mentioned acquisition
As subtracting load side voltage Formula2 (Uc) data object of above-mentioned acquisition, carrying out Difference Calculation, obtain test product high-voltage alternating
Recovery voltage data object Formula (U after breaker optimizationf):
Formula(Uf) = Formula(Um) - Formula2(Uc) (9)
Calibrated current zero passage ceases arc moment t1: voltage data object Formula (U is restored to above-mentioned high-voltage AC breakerf) wave
Shape chooses high-voltage AC breaker by closing a floodgate to separating brake proper range data segment, to recovery voltage Formula (Uf) carry out sufficiently
Amplification display when ceasing arc according to high-voltage AC breaker current over-zero, restores voltage from significantly rising to supreme electricity close to zero
It is flat, restoring voltage Formula (Uf) on waveform, it is high-voltage AC breaker current over-zero that demarcation signal, which significantly rises to starting point,
Cease arc moment t1；
It demarcates the rigid timesharing of contact and carves t2: arc moment t is ceased in the calibration current over-zero1Afterwards, to recovery voltage data object
Formula(Uf), tens of milliseconds ranges before the calibrated high-voltage AC breaker current over-zero breath arc moment is chosen, is main aobvious
Show region, carry out sufficiently amplification display, when just having divided the starting the arc according to high-voltage AC breaker contact, restore voltage from zero transition to
The characteristic of arc voltage level ceases before the arc moment in tens of milliseconds ranges, mark in the high-voltage AC breaker current over-zero of calibration
The starting point that determining signal obviously has whole some tens of volts transition is that t is carved in the rigid timesharing of high-voltage AC breaker contact2；
Calculate arcing time Tarc: high-voltage AC breaker current over-zero is ceased into arc moment t1T is carved with the rigid timesharing of contact2Subtract each other, i.e.,
Obtain arcing time measured value:
Tarc= t1 - t2(10)
Or three-phase test single-phase to high-voltage AC breaker, is all made of above-mentioned steps, accurately measures each phase arcing time respectively.
2. high-voltage AC breaker arcing time measurement method as described in claim 1, it is characterised in that: put down described in step 2
Sliding parameter range are as follows: 2≤N≤10.
3. high-voltage AC breaker arcing time measurement method as described in claim 1, it is characterised in that: to subsequent any time
The measurement of breaking test arcing time, the zero drift correction value U directly obtained using survey calculation for the first timem0、Uc0, load-side electricity
Buckling is than correction coefficient k, and without redeterminating every time, the following function expression of direct editing carries out zero drift amendment, no-load voltage ratio
Correction and digital smoothness, the recovery voltage signal Formula(U after being optimizedf), carry out arcing time measurement:
Formula(Uf)=SmoothSignal((Um-Um0)-k*(Uc-Uc0), N) (11).
4. high-voltage AC breaker arcing time measurement method as described in claim 1, it is characterised in that: to comprising larger humorous
The voltage signal of wave content, then increase digital filtering, and using digital filtering function, reducing harmonic wave influences.
5. high-voltage AC breaker arcing time measurement method as described in claim 1, it is characterised in that: zero drift amendment
Value, load side voltage ratio correction of transformation coefficient only need to calculate once, to subsequent any secondary breaking test, then directly after testing acquisition for the first time
Utilization is connect, without surveying again.
6. high-voltage AC breaker arcing time measurement method as described in claim 1, it is characterised in that: the high-voltage alternating
Breaker arcing time measurement method, by having the digital instantaneous waveform recorder direct-on-line of corresponding analysis function or offline
Measurement, or by having corresponding function Data Analysis Software, carry out determined off-line.
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| CN106646199B (en) * | 2016-12-30 | 2019-08-09 | 西安科技大学 | Inductive circuit breaking arc discharge time detection circuit and method |
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| CN106707005B (en) * | 2017-03-01 | 2019-10-08 | 西安科技大学 | Inductive circuit disconnects electric arc start/stop time detection circuit and method |
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| CN107561435B (en) * | 2017-08-31 | 2020-07-07 | 中国南方电网有限责任公司 | Circuit breaker arcing time distinguishing method and system based on volt-ampere characteristics |
| CN108732493A (en) * | 2018-06-21 | 2018-11-02 | 沈阳工业大学 | A kind of experimental rig and method being suitable for measuring arc voltage |
| CN109031110B (en) * | 2018-08-07 | 2021-06-04 | 南方电网科学研究院有限责任公司 | Breaker breaking capacity evaluation method under harmonic condition |
| CN109239592A (en) * | 2018-09-20 | 2019-01-18 | 罗孚电气（厦门）有限公司 | Contact of breaker performance monitoring method, device and monitoring system |
| CN111413551B (en) * | 2020-04-09 | 2022-05-20 | 云南电网有限责任公司电力科学研究院 | Method and device for extracting radiation electromagnetic wave signals of arc extinguish chamber |
| CN111579977B (en) * | 2020-05-13 | 2022-10-25 | 河南省高压电器研究所有限公司 | Method for measuring arcing time of circuit breaker |
| CN112327151B (en) * | 2020-10-26 | 2022-05-06 | 南方电网科学研究院有限责任公司 | Method and device for monitoring switching state of on-load tap-changer and terminal equipment |
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| CN1006577B (en) * | 1985-06-10 | 1990-01-24 | 西安高压电器研究所 | Method for limiting and detecting arcing period in line breaker |
| US7988833B2 (en) * | 2002-04-12 | 2011-08-02 | Schneider Electric USA, Inc. | System and method for detecting non-cathode arcing in a plasma generation apparatus |
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