CN102967826B - Test method for electric endurance of switching capacitor set beaker of extra-high voltage project - Google Patents
Test method for electric endurance of switching capacitor set beaker of extra-high voltage project Download PDFInfo
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- 239000003990 capacitor Substances 0.000 title claims abstract description 91
- 238000010998 test method Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 119
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims description 23
- 230000010355 oscillation Effects 0.000 claims description 15
- 238000013016 damping Methods 0.000 claims description 11
- 238000010891 electric arc Methods 0.000 claims description 6
- 206010003830 Automatism Diseases 0.000 claims description 4
- 238000012795 verification Methods 0.000 abstract description 8
- 238000004088 simulation Methods 0.000 abstract 1
- 238000004804 winding Methods 0.000 description 11
- 230000001052 transient effect Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention provides a test method for electric endurance of a switching capacitor set beaker of the extra-high voltage project. The method passes the Acceptance Test Procedure (ATP) simulation verification, test results meet the standard and all requirements of the extra-high voltage project for the switching capacitor set test, a synthetic loop and an inductance-capacitance (LC) oscillating loop are used for testing, the loading investment of a test station for test devices is reduced, and the device safety hazards caused by long-time and large-quantity electrical endurance tests can be reduced.
Description
Technical field
The invention belongs to extra-high voltage project switchgear and test field, be specifically related to a kind of extra-high voltage project opening-closing capacitor bank circuit breaker electrical endurance test method.
Background technology
Extra-high voltage grid power transmission changed power is large, reactive power/voltage control problem is very outstanding, and the Capacitor banks of switching main transformer three sides is important means of control system voltage.UHVAC demonstration project compensation capacitors voltage is high, capacity large, and system-computed proposes, and Jingmen and southeast Shanxi ultra-high voltage transformer station require opening-closing capacitor bank isolating switch rated voltage 145kV, rated capacitors group dropout current 1600A.In addition, extra-high voltage utility capacitor group isolating switch is as the Main Means of capacitor group switching, and switched capacitor class frequency is high, day the frequency up to 3 ~ 4 times, very high requirement can be proposed to electric life, and the problem of existing product ubiquity electric life wretched insufficiency.Capacitor banks circuit breaker electrical endurance in using in China's UHVAC demonstration project knows the real situation verification experimental verification electric life less than 1000 times, can not meet extra-high voltage project needs.May there is repeated breakdown time not enough in Capacitor banks circuit breaker electrical endurance, produce repeated breakdown superpotential, threatens Capacitor banks equipment safety, and still lack effective salvo to this superpotential, so may produce serious threat to extra-high voltage system safety operation.Along with the development of extra-high voltage grid, the impact of Capacitor banks circuit breaker electrical endurance deficiency will be further remarkable, so be badly in need of carrying out the development of high life Capacitor banks isolating switch, verification experimental verification and engineer applied.And for the specific demand of extra-high voltage project, not yet carried out the verification experimental verification of so high life Capacitor banks isolating switch in the world.
When in extra-high-voltage alternating current transformer station, high, the medium voltage side voltage of main transformer is in different operation level, the tertiary winding drops into capacitive reactive power when compensating, and tertiary winding voltage is also in different levels.If tertiary winding voltage exceedes highest operating voltage, reactive-load compensation equipment can not put into operation.Thus, with tertiary winding highest operating voltage for standard, the reactive compensation capacity calculated is the most direct indicator weighing main transformer reactive power compensation planning.
Table 1 drops into the voltage characteristic of tertiary winding when 1500Mvar capacitive reactive power compensates for the main transformer tertiary winding, if remarks column exceedes highest operating voltage for tertiary winding voltage, allows the maximum capacitive reactive-load compensation amount dropped into.Main transformer medium voltage side tap is when maximum position, and high side voltage is at 1000 ~ 1100kV, and medium voltage side voltage, when 500 ~ 550kV, drops into tertiary winding voltage when 1500Mvar capacitive reactive power compensates and all can not exceed highest operating voltage 126kV.Along with the reduction of main transformer tap joint position, tertiary winding voltage will raise, voltage can exceed highest operating voltage in some cases, if medium voltage side tap is when centre position, if medium voltage side voltage is 550kV, then tertiary winding voltage is between 128.9 ~ 130kV, and the capacitive reactive power dropping into 1000Mvar can only be allowed in this case to compensate.If main transformer tap is at minimum position, allow the capacitive reactive power compensation capacity dropped into reduce further, minimum is 270Mvar.Visible, under the program under some method of operation, low-pressure side reactive power compensation planning, by limited, can only drop into 270Mvar capacitive reactive power and compensate time the most serious.Main transformer maximum capacitive reactive compensation capacity scope is 270 ~ 1500Mvar, according to system operation conditions reasonable disposition tap joint position, thus can ensure that the tertiary winding can realize full capacity reactive-load compensation in actual motion.
Table 1
In UHVAC demonstration project, 110kV side reactive power compensator adopts earth-free mode, adopts which operational reliability higher.For compensation capacitors, lightning arrester installation site has two kinds of modes usually, a kind of be lightning arrester be arranged on Shunt Capacitor Unit end over the ground between, be called for short MOA mode A, as Fig. 1; Another kind be lightning arrester be arranged on the anti-end of shnt capacitor string over the ground between, be called for short MOA mode B.As shown in Figure 2.Adopt MOA mode A in UHVAC demonstration project, which can reduce Capacitor banks overvoltage protection level.
By carrying out system-computed to the various methods of operation of reactive power compensator, in conjunction with actual conditions, opening-closing capacitor bank Circuit breaker technology parameter is as shown in table 2.
Table 2
In opening-closing capacitor bank isolating switch interrupting capacitor set current course, recovery voltage is high, duration is long, easily occur that repeated breakdown produces superpotential, reactive power compensator and system insulation are constituted a serious threat, because opening-closing capacitor bank breaker actuation is relatively more frequent, so require very low repeated breakdown probability (C1 level).Opening-closing capacitor bank isolating switch will close amplitude, high frequency shoves, and Amplitude Ration capacitor running current several times to tens times greatly, frequency can reach a few KHz, easily causes contact melting welding, scaling loss, damage parts and insulation harm etc.Shove the most serious when closing with back-to-back Capacitor banks, because installation site between Capacitor banks is comparatively near, inductance is very little therebetween, so when dropping into Capacitor banks, has dropped into Capacitor banks and can drop into Capacitor banks charging to plan, produced amplitude and all very high the shoving of frequency.So the Capacitor banks electric current folding performance verification of isolating switch is extremely important, concerning switch performance, to system safety operation, there is material impact.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of extra-high voltage project opening-closing capacitor bank circuit breaker electrical endurance test method, by ATP simulating, verifying, test findings meets the requirements that standard and extra-high voltage project are tested opening-closing capacitor bank, and, utilize synthesis loop and LC oscillation circuit to test, not only reduce testing station and the overload of rig for testing is dropped into, the device security risk that the electrical endurance test also reducing long-time, large quantity brings.
In order to realize foregoing invention object, the present invention takes following technical scheme:
A kind of extra-high voltage project opening-closing capacitor bank circuit breaker electrical endurance test method is provided, said method comprising the steps of:
Step 1: carry out T60 pilot study;
Step 2: carry out closing test of shoving;
Step 3: carry out capacity current breaking test;
Step 4: adopt synthetic test mode to circulate and carry out closing shove test and capacity current breaking test.
In described step 1, under nominal pressure, carry out 3 T60 breaking test, the electric current of described T60 breaking test is 60% rated short circuit current, and the arc time meets T60 testing requirements in national standard, and does not do requirement for recovery voltage.
In described step 2, LC oscillation circuit is adopted to carry out closing test of shoving at least 120 times.
Close and shove in test, trial voltage is identical with specified capacity current breaking test single-phase straightway testing voltage; Peak value and the frequency of shoving is determined by tested isolating switch requirement, and the expection ratio of damping that shoves is more than or equal to 0.85.
Described LC shakes loop and comprises the charging capacitor C1, electric discharge inductance L 1 and the isolating switch S0 that connect successively; LC oscillation circuit closes isolating switch S0 after being charged by charging capacitor C1, and charging capacitor C1 discharges through overdischarge inductance L 1, produces high frequency oscillation electric current, selects electric capacity and electric capacity, namely obtains required circuit breaker current.
In described step 3, introduce loop by electric current and carry out capacity current breaking test.
Described electric current is introduced in loop, and current source provides the big current before current over-zero, and voltage source has acted on isolating switch SO ＇ before current over-zero, and voltage source provides portion of electrical current simultaneously.
During current over-zero, the recovery voltage that voltage source provides immediately automatism on isolating switch SO; Detailed process is: before test, auxiliary circuit breaker S1 is in open position, isolating switch S0 ＇ is in closing position, close auxiliary circuit breaker S1, isolating switch S0 ＇ has electric current I c to flow through, and makes auxiliary circuit breaker S1 and isolating switch S0 ＇ cut-off, and then produces electric arc, electric arc extinguishes when current over-zero, and recovery voltage is added on isolating switch S0 ＇ automatically.
Described capacity current breaking test comprises the following steps:
Steps A: carry out 120 specified capacity current breaking tests;
Step B: carry out 8 10 ~ 40% specified capacity current breaking tests;
Step C: the test repeating steps A and step C.
In specified capacity current breaking test, amount to 120 breaking and making operations, wherein, 12 breaking and making operations are distributed in the polarity of a step-length 15 °, 42 breaking and makings operate in the shortest arc time in a polarity, 12 breaking and making operations are distributed in the polarity of another step-length 15 °, 42 breaking and makings operate in the shortest arc time in another polarity, the operation of all the other breaking and makings is uniformly distributed, closing operation is all blank operation, electrical apparatus release is ceiling voltage, and arc-chutes are rated pressure, and 6 ° of step-lengths are the shortest arc time.
In described 10 ~ 40% capacity current breaking tests, amount to 48 and close closing operation, wherein, 12 close closing operations and are distributed in the polarity of a step-length 15 °, and 6 close in the shortest arc time of operating in a polarity, 12 close closing operation and are distributed in the polarity of another step-length 15 °, 6 close in the shortest arc time of operating in another polarity, and all the other close closing operations and are uniformly distributed, and electrical apparatus release is ceiling voltage, arc-chutes are minimal function pressure, and 6 ° of step-lengths are the shortest arc time; Closing operation is closed for all Capacitor banks, close and should occur in applied voltage peak value ± 15 °, making current at least should equal back-to-back capacitor bank inrush making current, the expection ratio of damping shoved during back-to-back Capacitor banks switching test, namely second peak value of same polarity and the ratio of first peak value should be equal to or greater than 0.85.
The test current of described opening-closing capacitor bank circuit breaker electrical endurance test should require the back-to-back Capacitor banks electric current that cut-offs to apply specified capacity current respectively according to tested isolating switch, and according to test method applying 10 ~ 40% specified capacity currents; Trial voltage is the product of the specified phase voltage of tested isolating switch and ratio of damping, electric power loop should be able to provide voltage and current respectively according to breaker actuation, wherein, electric power loop provides the change of power-frequency voltage should be less than 2% when carrying out specified capacity current breaking test, should be less than 5% when carrying out 10 ~ 40% specified capacity current breaking test; Electric power loop impedance is not low to moderate makes its short-circuit current exceed isolating switch rated short circuit drop-out current, the electric capacity in loop and the impedance between the electric capacity of mains side and the electric capacity of load-side, should make to reach when 100% specified back-to-back capacitor bank breaking current tests rated capacitors group and close and shove.
Compared with prior art, beneficial effect of the present invention is: the invention provides a kind of extra-high voltage project opening-closing capacitor bank circuit breaker electrical endurance test method, by ATP simulating, verifying, test findings meets the requirements that standard and extra-high voltage project are tested opening-closing capacitor bank, and, utilize synthesis loop and LC oscillation circuit to test, not only reduce testing station and the overload of rig for testing is dropped into, the device security risk that the electrical endurance test also reducing long-time, large quantity brings.
Accompanying drawing explanation
Fig. 1 is that in prior art, MOA mode A schematic diagram installed by lightning arrester;
Fig. 2 is that in prior art, MOA mode B schematic diagram installed by lightning arrester;
Fig. 3 is electric current in isolating switch beginning process and voltage oscillogram;
Fig. 4 is that LC shakes circuit connection schematic diagram;
Fig. 5 is synthetic test loop elementary diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
A kind of extra-high voltage project opening-closing capacitor bank circuit breaker electrical endurance test method is provided, said method comprising the steps of:
Step 1: carry out T60 pilot study;
Step 2: carry out closing test of shoving;
Step 3: carry out capacity current breaking test;
Step 4: adopt synthetic test mode to circulate and carry out closing shove test and capacity current breaking test.
As seen from Figure 3, before arc extinction, the voltage in arc gap is very low, is mainly the pressure drop in line impedance; Before and after current over-zero, electric current is very little, but the recovery voltage be added in after zero passage in arc gap is very high.Visible break device is in interrupting process. and big current and high voltage do not appear in arc gap simultaneously.
In described step 1, under nominal pressure, carry out 3 T60 breaking test, the electric current of described T60 breaking test is 60% rated short circuit current, and the arc time meets T60 testing requirements in national standard, and does not do requirement for recovery voltage.
In described step 2, LC oscillation circuit is adopted to carry out closing test of shoving at least 120 times.
Close and shove in test, trial voltage is identical with specified capacity current breaking test single-phase straightway testing voltage; Peak value and the frequency of shoving is determined by tested isolating switch requirement, and the expection ratio of damping that shoves is more than or equal to 0.85.
As Fig. 4, described LC shakes loop and comprises the charging capacitor C1, electric discharge inductance L 1 and the isolating switch S0 that connect successively; LC oscillation circuit closes isolating switch S0 after being charged by charging capacitor C1, and charging capacitor C1 discharges through overdischarge inductance L 1, produces high frequency oscillation electric current, selects electric capacity and electric capacity, namely obtains required circuit breaker current.
Tested isolating switch rated voltage: Ur=145kV
Trial voltage:
Specified back-to-back capacitor bank breaking current: I=1600A
Recovery voltage:
Expection is shoved ratio of damping: k >=0.85
High-pressure synthesis loop is a kind of cost-effective test method for primary cut-out breaking capacity test, whole electric current or most of electric current obtain from a power supply (current return), and applied voltage and/or return voltage (transient state with power frequency) are all or part of obtains from another or multiple independently power supply (voltage circuit).Synthetic test method, when carrying out circuit breaker short circuit current breaking test, adopts the power supply that two covers are relatively independent, forms short-circuit current loop, be called for short current source by low-voltage, high-current source; Form voltage circuit by small area analysis high-voltage power supply, be called for short voltage source.Replace independent high voltage, high-current supply with above two power supplys, and synthesized in current over-zero district by sync control device.
The current source of synthesis loop directly can take from electrical network, and can be also surge generator or oscillation circuit, voltage source generally adopts oscillation circuit.Although synthesis loop needs two cover power supplys, the capacity often overlapping power supply is all relatively little, and equipment investment is much less than straightway testing, and the equivalence of synthetic test gains public acceptance, and clearly embodies in relevant IEC standard and national standard.
Synthetic test method is mainly divided into two large types:
(1) voltage introduces loop.Current source provides the big current before current over-zero and the high voltage of electric current shortly past zero time, and voltage source provides high voltage following closely.
(2) electric current introduces loop.Current source provides the big current before current over-zero, and voltage source has acted on tested isolating switch before current over-zero, and voltage source also provides portion of electrical current.During current over-zero, the recovery voltage that voltage source provides immediately automatism on tested isolating switch.
Because arc resistance during current over-zero first few hundred microsecond is large, because the voltage of current source is lower, electric current is difficult to keep sinusoidal shape and occur certain distortion.The interrupting process only just allowing voltage source devote oneself to work in the arc process of the tested isolating switch of guarantee and actual electric network when current over-zero first few hundred microsecond is basically identical, and therefore, the equivalence that electric current introduces loop is better.
In described step 3, introduce loop by electric current and carry out capacity current breaking test.
As Fig. 5, wherein, Ic is current source, and Uv is voltage source, and Lc is current return reactor, and Lv is voltage circuit reactor, and Cc is current return capacitor, and Cv is voltage circuit capacitor S1 is current return auxiliary circuit breaker, and S0 ＇ is isolating switch.Electric current is introduced in loop, and current source provides the big current before current over-zero, and voltage source has acted on isolating switch SO ＇ before current over-zero, and voltage source provides portion of electrical current simultaneously.
During current over-zero, the recovery voltage that voltage source provides immediately automatism on isolating switch SO; Detailed process is: before test, auxiliary circuit breaker S1 is in open position, isolating switch S0 ＇ is in closing position, close auxiliary circuit breaker S1, isolating switch S0 ＇ has electric current I c to flow through, and makes auxiliary circuit breaker S1 and isolating switch S0 ＇ cut-off, and then produces electric arc, electric arc extinguishes when current over-zero, and recovery voltage is added on isolating switch S0 ＇ automatically.This loop is that parallel-current is introduced, and very little distortion can occur the electric current that tested isolating switch flows through, very little on the equivalence impact of test.For preventing the waveform too much affecting power current, introduce the frequency of electric current preferably at about 500Hz, lower limit is 250Hz, and the upper limit is 1000Hz.
Isolating switch S0 ＇ rated voltage: Ur=145kV
Trial voltage:
Specified back-to-back capacitor bank breaking current: I=1600A
Voltage circuit supply voltage: Uv=US
Current return introduces electric current: I
c=(1-1/m) I, the current ratio that test current and voltage circuit that wherein m is regulation provide
Current return electric capacity: C
c=(1-1/m) mn × C
v, the voltage ratio that trial voltage and current return that wherein n is regulation provide
Voltage circuit inductance:
Current return inductance: L
c=1/mn ω
2c
v
Described capacity current breaking test comprises the following steps:
Steps A: carry out 120 specified capacity current breaking tests;
Step B: carry out 8 10 ~ 40% specified capacity current breaking tests;
Step C: the test repeating steps A and step C.
In specified capacity current breaking test, amount to 120 breaking and making operations, wherein, 12 breaking and making operations are distributed in the polarity of a step-length 15 °, 42 breaking and makings operate in the shortest arc time in a polarity, 12 breaking and making operations are distributed in the polarity of another step-length 15 °, 42 breaking and makings operate in the shortest arc time in another polarity, the operation of all the other breaking and makings is uniformly distributed, closing operation is all blank operation, electrical apparatus release is ceiling voltage, and arc-chutes are rated pressure, and 6 ° of step-lengths are the shortest arc time.
In described 10 ~ 40% capacity current breaking tests, amount to 48 and close closing operation, wherein, 12 close closing operations and are distributed in the polarity of a step-length 15 °, and 6 close in the shortest arc time of operating in a polarity, 12 close closing operation and are distributed in the polarity of another step-length 15 °, 6 close in the shortest arc time of operating in another polarity, and all the other close closing operations and are uniformly distributed, and electrical apparatus release is ceiling voltage, arc-chutes are minimal function pressure, and 6 ° of step-lengths are the shortest arc time; Closing operation is closed for all Capacitor banks, close and should occur in applied voltage peak value ± 15 °, making current at least should equal back-to-back capacitor bank inrush making current, the expection ratio of damping shoved during back-to-back Capacitor banks switching test, namely second peak value of same polarity and the ratio of first peak value should be equal to or greater than 0.85.
Recovery voltage
According to 6.111.3 and 6.111.10 regulation in IEC 62271-100:2001, the change of test loop power-frequency voltage during folding, to test method 1(BC1) should 2% be less than, to test method 2(BC2) should 5% be less than.If change in voltage exceedes setting, switching test can meet in the loop of following requirement and carries out in expection recovery voltage (TRV):
u
c′≥u
c
t
2′≤t
2
Wherein, u
cfor recovery voltage peak value, u
c' be recovery voltage peak value transient value, t
2for the recovery voltage time, t
2' be recovery voltage peak value transient state time.
U
1, t
1, u
cand t
2setting is as shown in table 3.
Table 3
Wherein, t
1should with reference to rated voltage 145kV earthed system and the isolated neutral system regulation by transient recovery voltage (TRV) standard value of four Parametric Representations, as shown in table 4.
Table 4
Can be drawn by table 3 and table 4:
● test method 1:
t
1≥89μs
t
2＝8.7ms
● test method 2:
t
1≥89μs
t
2＝8.7ms
Require the rated voltage 145kV of opening-closing capacitor bank isolating switch for extra-high voltage project, the relevant regulations that IEC 62271-100:2001 has the folding of 145kV circuit-breaker capacitor group electric current should be followed.Comprehensive IEC standard and extra-high voltage project particular/special requirement, capacitor group switching test should meet isolating switch 145kV rated voltage, 1600A rated capacitors group dropout current, and 20kA/4250Hz rated capacitors group closes shoves, 3000 electric lifes, and the requirement such as the recovery voltage of interrupting process.
At present, high power laboratory room uses straightway testing method mostly when carrying out isolating switch folding current testing, namely applied voltage, electric current and transient state and power frequency return voltage all have the test that a single supply loop obtains, this power supply can be electric system or the generator special being used in circuit-breaker testing station, or both combinations; In certain usable range, it also can be the LC single-frequency oscillation circuit of the couple capacitors reactor electric discharge of charging.The voltage of the applied voltage of test loop and power frequency recovery voltage and this power supply is suitable.But, opening-closing capacitor bank is tested, capacity current is large, frequency is high, recovery voltage is high, all brings certain threat to laboratory test loop and testing equipment, and domestic high power laboratory station ability level is uneven, the test of ultra-high voltage transformer station Capacitor banks circuit breaker electrical endurance is carried out by the mode of straightway testing, invest huge, run, maintenance workload is large, complicated operation, and capacity limits to some extent, System recover voltage not easily meets the demands.
The test current of described opening-closing capacitor bank circuit breaker electrical endurance test should require the back-to-back Capacitor banks electric current that cut-offs to apply specified capacity current respectively according to tested isolating switch, and according to test method applying 10 ~ 40% specified capacity currents; Trial voltage is the product of the specified phase voltage of tested isolating switch and ratio of damping, electric power loop should be able to provide voltage and current respectively according to breaker actuation, wherein, electric power loop provides the change of power-frequency voltage should be less than 2% when carrying out specified capacity current breaking test, should be less than 5% when carrying out 10 ~ 40% specified capacity current breaking test; Electric power loop impedance is not low to moderate makes its short-circuit current exceed isolating switch rated short circuit drop-out current, the electric capacity in loop and the impedance between the electric capacity of mains side and the electric capacity of load-side, should make to reach when 100% specified back-to-back capacitor bank breaking current tests rated capacitors group and close and shove.
Test current
Ultra-high voltage transformer station opening-closing capacitor bank circuit-breaker capacitor group dropout current required value 1600A, has exceeded the preferred value 400A in the remittance of IEC standard; Close and shove and shove frequency then according to the regulation in table 5, select 20kA and 4250Hz.
Table 5
Trial voltage
Adopt the single-phase test of testing laboratory, the trial voltage recorded in isolating switch place place before breaker open operation should be not less than
with following capacitive voltage coefficient k
cproduct:
1) 1.0 normal running (operation) conditions being applicable to earth neutral system;
2) 1.4 following situation is applicable to:
---cut-offfing under the system normal running (operation) conditions beyond earth neutral system;
---cut-offfing of the Capacitor banks of neutral point insulation:
UHVAC demonstration project 110kV side reactive power compensator adopts earth-free mode, and therefore, trial voltage (effective value) should be elected as
and the industrial frequency experiment voltage on loop and the DC voltage produced by residual charge should keep at least 0.3s after cut-offfing.
As table 6, ultra-high voltage transformer station opening-closing capacitor bank isolating switch is C1 level isolating switch, i.e. low repeated breakdown probability isolating switch.Test method is as follows:
The test method of each experimental series should carried out without on a sample of any maintenance, adopts following abbreviation:
Back-to-back Capacitor banks switching test such as table 6 specifies, does not need to carry out preparation property test.
For closing-contact of breaking test isolating switch should not be separated before transient current disappears, and should adjust the time interval between combined floodgate and sub-switching operation for this reason.
Before closing closing operation, obvious electric charge that capacitive loop does not have exists.
Close closing operation for all Capacitor banks, close and should occur in applied voltage peak value ± 15 °, making current at least should equal back-to-back capacitor bank inrush making current.
Table 6
The expection ratio of damping shoved during back-to-back Capacitor banks switching test, namely second peak value of same polarity and the ratio of first peak value should be equal to or greater than 0.85.
In sub-switching operation process, by changing the moment that contact is separated, being followed successively by about 6 °, determining the shortest arc time.Adopt the method, must test several times thus verify the shortest arc time and the longest arc time.
If do not obtain the shortest arc time of expecting, but an arc time the longest, test is still effective, and accrued in total number of times.In this case, be necessary:
---dropout pulse in advance 6 °, repeat this test, new setting valve can be used as other test of the shortest arc time;
---do a sub-switching operation less to ensure total test number (TN).
Even if exceed total number of operations of regulation, the number of operations requirement under the shortest arc time must be reached.
A rear current zero cut-offs restriking of rear appearance and cut-offs operation when should be regarded as the long arc time.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. an extra-high voltage project opening-closing capacitor bank circuit breaker electrical endurance test method, is characterized in that: said method comprising the steps of:
Step 1: carry out T60 pilot study;
Step 2: carry out closing test of shoving;
Step 3: carry out capacity current breaking test;
Step 4: adopt synthetic test mode to circulate and carry out closing shove test and capacity current breaking test;
In described step 1, under nominal pressure, carry out 3 T60 breaking test, the electric current of described T60 breaking test is 60% rated short circuit current, and the arc time meets T60 testing requirements in national standard, and does not do requirement for recovery voltage;
In described step 2, LC oscillation circuit is adopted to carry out closing test of shoving at least 120 times;
Close and shove in test, trial voltage is identical with specified capacity current breaking test single-phase straightway testing voltage; Peak value and the frequency of shoving is determined by tested isolating switch requirement, and the expection ratio of damping that shoves is more than or equal to 0.85;
In described step 3, introduce loop by electric current and carry out capacity current breaking test;
Described electric current is introduced in loop, and current source provides the big current before current over-zero, and voltage source has acted on isolating switch S0 ＇ before current over-zero, and voltage source provides portion of electrical current simultaneously;
During current over-zero, the recovery voltage that voltage source provides immediately automatism on isolating switch S0 ＇; Detailed process is: before test, auxiliary circuit breaker S1 is in open position, isolating switch S0 ＇ is in closing position, close auxiliary circuit breaker S1, isolating switch S0 ＇ has electric current I c to flow through, and makes auxiliary circuit breaker S1 and isolating switch S0 ＇ cut-off, and then produces electric arc, electric arc extinguishes when current over-zero, and recovery voltage is added on isolating switch S0 ＇ automatically;
Described capacity current breaking test comprises the following steps:
Steps A: carry out 120 specified capacity current breaking tests;
Step B: carry out 8 10 ~ 40% specified capacity current breaking tests;
Step C: the test repeating steps A and step B;
Described LC oscillation circuit comprises the charging capacitor C1, electric discharge inductance L 1 and the isolating switch S0 that connect successively; LC oscillation circuit closes isolating switch S0 after being charged by charging capacitor C1, and charging capacitor C1 discharges through overdischarge inductance L 1, produces high frequency oscillation electric current, selects electric capacity and inductance, namely obtains required circuit breaker current;
In specified capacity current breaking test, amount to 120 breaking and making operations, wherein, 12 breaking and making operations are distributed in the polarity of a step-length 15 °, 42 breaking and makings operate in the shortest arc time in a polarity, 12 breaking and making operations are distributed in the polarity of another step-length 15 °, 42 breaking and makings operate in the shortest arc time in another polarity, the operation of all the other breaking and makings is uniformly distributed, closing operation is all blank operation, electrical apparatus release is ceiling voltage, and arc-chutes are rated pressure, and 6 ° of step-lengths are the shortest arc time;
In described 10 ~ 40% capacity current breaking tests, amount to 48 and close closing operation, wherein, 12 close closing operations and are distributed in the polarity of a step-length 15 °, and 6 close in the shortest arc time of operating in a polarity, 12 close closing operation and are distributed in the polarity of another step-length 15 °, 6 close in the shortest arc time of operating in another polarity, and all the other close closing operations and are uniformly distributed, and electrical apparatus release is ceiling voltage, arc-chutes are minimal function pressure, and 6 ° of step-lengths are the shortest arc time; Closing operation is closed for all Capacitor banks, close and should occur in applied voltage peak value ± 15 °, making current at least should equal back-to-back capacitor bank inrush making current, the expection ratio of damping shoved during back-to-back Capacitor banks switching test, namely second peak value of same polarity and the ratio of first peak value should be equal to or greater than 0.85;
The test current of described opening-closing capacitor bank circuit breaker electrical endurance test should require the back-to-back Capacitor banks electric current that cut-offs to apply specified capacity current respectively according to tested isolating switch, and according to test method applying 10 ~ 40% specified capacity currents; Trial voltage is the product of the specified phase voltage of tested isolating switch and ratio of damping, electric power loop should be able to provide voltage and current respectively according to breaker actuation, wherein, electric power loop provides the change of power-frequency voltage should be less than 2% when carrying out specified capacity current breaking test, should be less than 5% when carrying out 10 ~ 40% specified capacity current breaking test; Electric power loop impedance is not low to moderate makes its short-circuit current exceed isolating switch rated short circuit drop-out current, the electric capacity in loop and the impedance between the electric capacity of mains side and the electric capacity of load-side, should make to reach when 100% specified back-to-back capacitor bank breaking current tests rated capacitors group and close and shove.
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| CN104793136B (en) * | 2015-05-07 | 2017-10-20 | 西安交通大学 | A kind of high pressure SF6Circuit breaker electrical endurance monitoring apparatus |
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| CN111579976B (en) * | 2020-05-12 | 2022-05-10 | 南瑞集团有限公司 | Loop parameter calculation method and system for high-voltage capacitive direct test |
| CN111737866A (en) * | 2020-06-12 | 2020-10-02 | 国家电网公司华北分部 | Extra-high voltage main transformer tap selection method and device based on optimal combination weight |
| CN112162163A (en) * | 2020-09-24 | 2021-01-01 | 南京璞骏新能源技术有限公司 | Novel high-voltage direct-current capacitor large-current testing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201528205U (en) * | 2009-09-16 | 2010-07-14 | 无锡市华戈电力电容器有限公司 | Low-voltage intelligent reactive power compensation device |
| CN102253333A (en) * | 2011-06-08 | 2011-11-23 | 河北工业大学 | Life tester for alternating-current contactor and control method thereof |
-
2012
- 2012-11-05 CN CN201210435428.XA patent/CN102967826B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201528205U (en) * | 2009-09-16 | 2010-07-14 | 无锡市华戈电力电容器有限公司 | Low-voltage intelligent reactive power compensation device |
| CN102253333A (en) * | 2011-06-08 | 2011-11-23 | 河北工业大学 | Life tester for alternating-current contactor and control method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 一种新的特高压断路器合成试验回路;裴振江 等;《中国电机工程学报》;20071130;第27卷(第33期);全文 * |
| 特高压断路器容性电流开合试验方法研究;黄实 等;《高压电器》;20070228;第43卷(第1期);全文 * |
| 高压交流断路器的合成试验;中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会;《中华人民共和国国家标准》;20080618;第7-15，48-58，79页 * |
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