CN105956263A - Method for optimizing insulating property of 500kV porcelain knob type circuit breaker for alternating current filter - Google Patents
Method for optimizing insulating property of 500kV porcelain knob type circuit breaker for alternating current filter Download PDFInfo
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Abstract
The invention discloses a method for optimizing the insulation performance of a 500kV porcelain knob type circuit breaker for an alternating current filter, which comprises the following steps: step 1, judging the fault type of a 500kV porcelain knob type circuit breaker, wherein the fault type comprises an external insulation fault and an internal insulation fault; step 2, when the fault type is an external insulation fault, optimizing the dry arc distance; when the fault type is a heavy breakdown fault, the air pressure of the arc extinguish chamber is improved or the phase selection and switching-off function is put into use; when the fault type is that the arc extinguish chamber electric field is distorted due to the fact that metal foreign bodies are sputtered on the contacts, the contact material is improved; when the fault type is that arc contacts of the arc extinguish chamber are in radial breakdown on the inner wall of the porcelain bushing, the arrangement structure of the voltage-sharing capacitor and the arc extinguish chamber is optimized. The invention provides different optimization methods for improving the insulating property of the circuit breaker according to different fault types, and ensures that the circuit breaker does not have insulating faults such as inner re-breakdown and outer insulation flashover of the arc extinguish chamber under the condition of frequently switching the alternating current filter bank and bearing higher transient recovery voltage.
Description
Technical field
The present invention relates to alternating current filter 500kV porcelain knob breaker and be used in insulating properties under alternating current-direct current operating mode
The method that can optimize, it is by analyzing alternating current filter (hereinafter referred to as ACF) exceptional operating conditions to open circuit
The impact of device insulating properties, specific aim proposes the insulating properties optimization method of alternating current filter chopper.
Background technology
ACF is with in 500kV porcelain knob breaker interrupting process, due to systematic parameter and the change of working condition,
The electromagnetic energy between capacitor and inductance can be caused to change, cause internal overvoltage.The most upon opening, disconnected
Needing to bear alternating current-direct current mixing overvoltage between Kou jointly to act on, this is the fortune that common AC system chopper does not has
Row operating mode.Additionally, big for alternating current filter pool-size in DC converter station, switching is frequent, its chopper
During switching operation in addition to should meeting the custom requirements of general AC circuit breaker, contact shoves when needing to bear combined floodgate
Accumulation ablation and the mechanical wear of frequent operation.These are likely to be to affect filter and breaker safety
The factor run.
The difference that alternating current filter chopper and normal circuit breaker are primarily present has 3 points:
(1) ACF chopper need to cut off capacitive load, transient recovery voltage TRV (Transient Recover
Voltage) higher, chopper repeated breakdown may be caused, need to require to exchange for switching at technical specifications
The chopper type approval test TRV of the wave filter verification experimental verification by 1470kV, this numerical requirements all than
GB1984-2014, GB11022-2011 relevant regulations value is harsh.
(2) AC filter and breaker switching is frequent, according to each current conversion station statistical result, the most often organizes ACF
Chopper 200 time/month, and general alternating-current field chopper is often organized the open and close times of a year and is not all reached 60 times, throws
During cutting, contact mechanical wear, the arc erosion of inrush phenomenon and cut-off capacitive load TRV frequently
To the test of dielectric and bear alternating current-direct current mixed-voltage, all make ACF chopper operate in one severe
Operating mode under, insulating Design own to chopper and assembly technology propose higher requirement.
(3) ACF chopper need to use combined floodgate phase selection device, requires non-to the dispersibility of chopper time response
Chang Yange, each producer requires difference, and according to standard, " GB/T 30846-2014 has predetermined interpolar behaviour's not same period
Make high-voltage AC breaker " requirement, chopper must assure that the deviation of single fracture branch wire time is at ± 1ms
Within.
At present state's inner breaker maker is for the insulation characterisitic of ACF chopper and reliable Journal of Sex Research relatively
Few, except according to technical specifications requirement, carrying out chopper TRV 1470kV resistance test and suggestion is installed additional
Outside phase selection closing-opening device, its structure there is no the biggest difference with technical conditions and regular alternating current field circuit breaker.Always
For body, the most current insulation characterisitic research for chopper under alternating current-direct current mixing superposition is few, because of
This insulating Design that insulating properties of the chopper for ACF are still followed conventional lines, causing trouble takes place frequently,
According to statistics between 2014～2015, certain model chopper there occurs 8 internal repeated breakdown of arc-chutes at NZ current conversion station,
1 blast and 3 external insulation flashovers, another model chopper there occurs 1 explosion accident at QX current conversion station.
Therefore, patent of the present invention will propose one based on alternating current filter group alternating current-direct current superimposition condition to chopper
Impact can be effectively improved the optimization method of chopper insulating properties.
Summary of the invention
For above-mentioned deficiency, it is an object of the invention to based on alternating current filter group alternating current-direct current superimposition condition disconnected
The impact of road device, proposes to improve the optimization method of chopper insulating properties, it is ensured that chopper is handed at frequent switching
In the case of flowing bank of filters and standing higher transient recovery voltage, the internal bang of arc-chutes will not occur
Wear and the insulation fault such as external insulation flashover.
For achieving the above object, the present invention adopts the technical scheme that:
A kind of alternating current filter 500kV porcelain knob breaker insulating properties optimization method, it includes following step
Rapid:
Step 1, judge 500kV porcelain knob breaker fault type, described fault type include external insulation therefore
Barrier and interior insulation fault, wherein, described interior insulation fault includes that repeated breakdown, contact sputtered metal foreign body cause
Interrupting porcelain insulator inwall is radially punctured by electric field distortion and arc-chutes arcing contact；
Step 2, when 500kV porcelain knob breaker fault type is external insulation fault, dry arcing distance is entered
Row optimizes；When 500kV porcelain knob breaker fault type attaches most importance to breakdown fault, improve arc-chutes SF6Gas
Body pressure or input phase selection separating brake function；When 500kV porcelain knob breaker fault type is contact splash gold
When genus foreign body causes electric field distortion, improve contact material；When 500kV porcelain knob breaker fault type is for going out
When interrupting porcelain insulator inwall is radially punctured by arc chamber arcing contact, optimize equalizing capacitor and arc-chutes arrangement.
The described method being optimized dry arcing distance is to lengthen interrupting porcelain insulator length, and lengthens and institute simultaneously
State the equalizing capacitor insulator length that interrupting porcelain insulator is corresponding, to increase creep age distance.
The described method being optimized dry arcing distance is by single interrupting porcelain insulator at original length up to
Reduce and add 200mm and by equalizing capacitor insulator corresponding for this single interrupting porcelain insulator at original length
The corresponding length of upper increase.
Improve arc-chutes SF6The method of gas pressure intensity is at former arc-chutes SF6Increase on the basis of gas pressure intensity
0.1MPa～0.2MPa.
Optimize the method for equalizing capacitor and arc-chutes arrangement be by equalizing capacitor insulator and arc-chutes by
The arrangement up and down of original vertical direction changes to the left and right arrangement in same level.
The method of described judgement 500kV porcelain knob breaker fault type comprises the following steps:
Step 1, by 500kV porcelain knob breaker failure recovery equipment fault current waveform extract fault
Current Waveform Characteristics data, described fault current waveform characteristic includes after blow-out to the electric current that breaks down
Time t1, fault current duration t2 and fault current waveform feature；
Step 2, according to fault current waveform characteristic failure judgement type:
The first situation: when after blow-out to the electric current that breaks down time t1 not less than 400ms and be not more than
During 2000ms, when sustained breakdown electric current occurs in simultaneous faults current waveform, then fault type is external insulation fault；
The second situation: when after blow-out to the time t1 of the electric current that breaks down not less than 7ms and no more than 9ms,
Fault current duration t2 is less than or equal to 2ms, and high frequency unicast peak, high frequency occurs in simultaneous faults current waveform
Unicast oscillation peaks and the higher-order of oscillation decay in any one time, check interrupting porcelain insulator inwall whether occur burn
Erosion vestige, if ablation vestige does not occur in interrupting porcelain insulator inwall, then fault type is repeated breakdown, otherwise,
Then fault type is that interrupting porcelain insulator inwall is radially punctured by arc-chutes arcing contact；
The third situation: when after blow-out to the electric current that breaks down time t1 not less than 10ms and be not more than
During 100ms, when simultaneous faults current waveform is stable at normal current after there is repeatedly arcing blow-out, then failure classes
Type is that contact sputtered metal foreign body causes electric field distortion (i.e. causing arc-chutes internal electric field to be distorted).
Compared with prior art, it has the beneficial effects that the present invention: can be sentenced exactly by this appraisal procedure
Not because body insulating Design is less than the fault type of 500KV porcelain knob double-fracture chopper, according to different faults
Type proposes difference and improves chopper insulating properties optimization method, it is ensured that chopper is at frequent switching ac filter
Device group and in the case of standing higher transient recovery voltage, it is to avoid occur the internal repeated breakdown of arc-chutes and
The insulation faults such as external insulation flashover.
Accompanying drawing explanation
Fig. 1 is the present invention a kind of alternating current filter 500kV porcelain knob breaker insulating properties optimization method
Flow chart；
Fig. 2 is the flow chart of fault type determination methods；
Fig. 3 be fault current be the typical waveform of breakdown current；
Fig. 4 be fault current be the typical waveform at high frequency unicast peak；
Fig. 5 be fault current be the typical waveform of high frequency unicast oscillation peaks；
Fig. 6 be fault current be the higher-order of oscillation decay typical waveform；
Fig. 7 be fault current be the typical waveform being stable at normal current after repeatedly arcing blow-out；
Fig. 8 is the arrangement figure of existing equalizing capacitor and arc-chutes；
Fig. 9 is the optimized arrangement structure figure of equalizing capacitor of the present invention and arc-chutes；
Figure 10 is that the A of Fig. 9 is to structural representation.
Detailed description of the invention
With detailed description of the invention, present disclosure is described in further details below in conjunction with the accompanying drawings.
Embodiment
One, statistical analysis based on ACF chopper insulation fault type
According to domestic and international ACF chopper insulation fault defect statistics, ACF porcelain knob breaker insulation fault is main
Be divided into 4 classes, respectively: 1) arc-chutes dry arcing distance deficiency cause moist rainy weather generation external insulation dodge
Network；2) there is repeated breakdown after arc-chutes blow-out between arcing contact；3) in arc-chutes, arcing contact sputtered metal is different
Thing causes the distortion of arc-chutes internal electric field thus internal flashover occurs；4) equalizing capacitor is arranged not with arc-chutes
Arcing contact occurs to interrupting porcelain insulator inwall when causing equalizing capacitor to there is bigger voltage difference with arc-chutes
Radially puncture.
The flow process that ACF chopper insulating properties optimize
Refer to shown in Fig. 1, the method for ACF chopper insulating properties optimization includes according to faulty equipment
Signature waveform judges the fault type of chopper, then provides different solution party according to different fault types
Case.Wherein:
Two, the determination methods of fault type
Signature waveform refers to the wave character parameter of fault current when there is flashover, and each class arcing fault is all
There are the waveform that it is special, wave character parameter to be stored in wave character parametric data storehouse, comprise all in data base
The characteristic parameter data of arcing fault.Concrete determination methods refer to shown in Fig. 2, and it comprises the following steps:
(1), fault current waveform characteristic, institute are extracted by fault current waveform in failure recovery equipment
Time t1, the fault current stated after fault current waveform characteristic includes blow-out to the electric current that breaks down are lasting
Time t2, fault current waveform feature, and check whether interrupting porcelain insulator inwall has ablation vestige.
(2), the characteristic parameter of above-mentioned fault current waveform characteristic with wave character parametric data storehouse is entered
Row contrast, it is judged that fault type:
Wherein, wave character parameter includes following four situation:
The first situation: when after blow-out (chopper disconnection) to the time t1 of the electric current that breaks down not less than 400ms
And during no more than 2000ms, there is sustained breakdown electric current in fault current waveform, extracts fault current waveform feature
If data are in this case, then fault type is judged as external insulation fault.
There is the situation of sustained breakdown electric current as it is shown on figure 3, the waveform of sustained breakdown electric current in fault current waveform
Feature is persistent period length (more than 2ms), and Wave crest and wave trough is alternately present repeatedly continuously, and between crest value with
And difference between valley value is the most little.
The second situation: when after blow-out to the time t1 of the electric current that breaks down not less than 7ms and no more than 9ms,
Fault current duration t2 is less than or equal to 2ms, and high frequency unicast peak, high frequency occurs in simultaneous faults current waveform
Unicast oscillation peaks and the higher-order of oscillation decay one of them, and ablation trace does not occur in interrupting porcelain insulator inwall
Mark, fault type in such cases is repeated breakdown.
Refer to shown in Fig. 4, fault current waveform occurs that the wave character at high frequency unicast peak is that the persistent period is short
, there are the most continuous two crests, inferred-zero electric current between two crests, and two ripples in (no more than 2ms)
Peak value difference is bigger.Refer to shown in Fig. 5, fault current waveform occurs that the waveform of high frequency unicast oscillation peaks is special
Levying is persistent period short (no more than 2ms), a crest occurs, and this crest after current returns to zero point.Please join
According to shown in Fig. 6, fault current waveform occurs that the wave character that the higher-order of oscillation is decayed is that the persistent period is short (little
In 2ms), Wave crest and wave trough is alternately present repeatedly continuously, and crest value and valley value are all gradually reduced.
The third situation: when after blow-out to the time t1 of the electric current that breaks down not less than 7ms and no more than 9ms,
Fault current duration t2 is less than or equal to 2ms, and high frequency unicast peak, high frequency occurs in simultaneous faults current waveform
Unicast oscillation peaks and the higher-order of oscillation decay one of them, and interrupting porcelain insulator inwall has ablation vestige, this
Fault type in the case of Zhong is that interrupting porcelain insulator inwall is radially punctured by arc-chutes arcing contact.
4th kind of situation: when after blow-out to the electric current that breaks down time t1 not less than 10ms and be not more than
During 100ms, simultaneous faults current waveform is stable at normal current after there is repeatedly arcing blow-out.
If extracting fault current waveform characteristic in this case, then fault type is judged as that contact sprays
Base metal foreign body causes electric field distortion.Refer to shown in Fig. 7, there is repeatedly arcing blow-out in fault current waveform
After to be stable at the wave character of normal current be that fault current duration is uncertain, repeatedly arcing blow-out occurs
(Fig. 7 dashed box part).
Above-mentioned determination methods can be by the event of arcing fault Current Waveform Characteristics data base's Quick chopper flashover
Barrier type.
Three, chopper insulating properties optimisation technique scheme
(1) prioritization scheme of external insulation fault, is avoided
External insulation fault generally comprises the rain sudden strain of a muscle because rainwater, ice, filth and water smoke cause respectively, ice dodges,
Pollution flashover and mist dodge.Its Optimized Measures is for optimizing dry arcing distance.
LW15A-550 type is opened in alternating current filter group according to external ABB HPL550 type and domestic west
Ruuning situation, when finding single porcelain knob breaker double-fracture dry arcing distance ＜ 2*2150mm, in moist unnecessary sky
Under the weather that gas or low temperature freeze, after chopper excision alternating current filter capacitive load, repeatedly occur outer exhausted
Edge arcing fault.
Therefore, cause the situation of external insulation performance for ACF chopper due to dry arcing distance deficiency, can adopt
Take lengthen arc-chutes dry arcing distance prioritization scheme, it is ensured that chopper dry arcing distance > 2*2200mm, below with
As a example by NZ current conversion station chopper optimizes case:
Owing to NZ current conversion station humidity is rainy, arc-chutes outer surface resistance declines, and external insulation may be caused to puncture,
So needing External Insulation ability to strengthen.According to product situation, arc-chutes external insulation Optimized Measures is:
1) lengthen interrupting porcelain insulator 200mm, increase creep age distance.
2) lengthen equalizing capacitor insulator 200mm, increase creep age distance.
Design parameter before and after interrupting porcelain insulator and porcelain shell for capacitor improve is shown in Table 1.
Parameter comparison before and after table 1 interrupting porcelain insulator and porcelain shell for capacitor improvement
When ACF chopper is under alternating current-direct current superimposition condition, original product interrupting porcelain insulator surface maximum field intensity
For 1.64kV/mm, after transformation, interrupting porcelain insulator surface maximum field intensity is 1.63kV/mm, substantially keeps
Constant, but after insulator lengthens, insulator creep age distance increases, and corresponding antifouling work ability may be significantly and carries
High.
After improving chopper external insulation dry arcing distance, according to the requirement of GB1984～2014, change chopper
Original model structure, requires supplementation with confirmatory type approval test, it is contemplated that change existing interrupting porcelain insulator
For king-size interrupting porcelain insulator, the type approval test project that need to supplement is as follows:
1) interrupting porcelain insulator complete set type approval test；
2) breaker fracture Insulation Test；
3) temperature rise test；
4) leakage test；
Above-mentioned each test and following supplementary proving test are the pattern under GB1984～2014 requires
Test, its concrete test method is referred to standard and performs, repeats no more here.
(2) prioritization scheme of arc-chutes generation repeated breakdown, is avoided
1, (arc-chutes SF is referred at former arc-chutes air pressure6Gas pressure intensity) on the basis of improve 0.1MPa～0.2MPa.
The reason of arc-chutes arcing contact generation repeated breakdown is mainly alternating current-direct current mixed flow regime after cut-offfing capacitive load
Under, the design of arc-chutes insulation margin is relatively low, and arcing contact has just divided time point to there is randomness, when between firm timesharing
Point is when electric arc near zero-crossing point, and arcing contact, owing to opening away from too small, causes transient recovery voltage between contact to be more than
, there is repeated breakdown in contact breakdown voltage.
Therefore nargin according to interrupting porcelain insulator bearing capacity on the basis of former arc-chutes air pressure, optional carries
High gas pressure intensity 0.1MPa～0.2MPa, can be effectively improved the insulation margin of arc-chutes, according to SF6 gas
Insulation margin computing formula(absolute pressure after the raising of ρ: arc-chutes gas, ρ0: former arc-chutes gas
The absolute pressure of body) can calculate insulation margin improve ratio be about 1.1～1.2 times.
Contrasting pressure Density Distribution under two kinds of operation pressures, parameter is shown in Table 2 and table 3.
Table 2 pressure intensity parameter is distributed
Table 3 density parameter is distributed
It can be seen that being gradually increased along with operation pressure, in plenum chamber, pressure is gradually increased, and air-flow passes through
Between contact, gap flows to pull bar direction, and the air pressure in pull bar also presents the trend increased and increase with operation pressure,
The gap location pressure of spout and static contact also presents the trend of overall increase.But on the whole, along with operation pressure
The change of power, the trend of pressure distribution is identical.
After arc-chutes gas pressure intensity improves, the Electric Field Simulation result of calculation of arc-chutes is as shown in following table 4-6:
The criterion of power frequency electric field critical breakdown strength under the different air pressure of table 4
The criterion of thunder and lightning electric field critical breakdown strength under the different air pressure of table 5
The criterion of thunder and lightning electric field critical breakdown strength under the different air pressure of table 6
By the electric field before and after improving product gas and airflow field analysis, improved structure, due to specified
Pressure improves, and SF6 gas pressure intensity and density improve, and is conducive to improving arc-chutes built-in electrical insulation and break performance.
In raising arc-chutes air pressure improvement chopper after insulation margin, according to the requirement of GB1984～2014, need
Supplement confirmatory type approval test project as follows:
1) breaker fracture Insulation Test；
2) short circuit current cut-offs and making test；
3) leakage test；
4) fitting with capacitor group BC1, BC2 test.
2, chopper is put into phase selection separating brake and control function
ACF chopper generation repeated breakdown is relevant to the arc time, when the border that sound arcing contact has just divided, current wave
Shape is close to zero crossing, and current amplitude the least (200-300A), the air-flow that at this moment air cylinder is powerful is by spray
Electric current can be put out by mouth, and 7ms-9ms after blow-out, it is extensive that the medium recovery strength between arcing contact is likely lower than transient state
Complex voltage amplitude (1-coswt) Um, thus there is repeated breakdown.
Put into phase selection separating brake to control after function, make the border that arcing contact has just divided, current waveform delayed more than 90 ° (i.e.
Just point time point advance current zero crossing 5ms), now sound arcing contact relative motion arcing 5ms, work as electricity
When flowing through zero point, arcing contact is opened away from enough distances, and the breakdown voltage between contact improves accordingly.
When arc-extinguishing chamber of circuit breaker built-in electrical insulation margin design deficiency, arcing contact in the difference of just point time point,
Determine electric arc zero crossing when extinguishing, arcing contact open away from size, and open and exist away from the breakdown voltage with arcing contact
SF6Direct proportionality in the case of air pressure is certain.Therefore, put into phase selection separating brake and control function, can be effective
Control arc-chutes arcing contact arcing time, it is ensured that current zero-crossing point blow-out when, arcing contact open away from
Distance will not be by over-voltage breakdown.
In input phase selection separating brake function improvement chopper after insulation margin, according to the requirement of GB1984～2014,
Require supplementation with confirmatory type approval test project as follows:
1) chopper double-fracture time synchronism test；
2) chopper double-fracture branch wire time dispersivity test
3) phase selection switching-off device and chopper united test, including: atmospheric environment test, mechanical test, electricity
Gas Insulation Test and EMC test.
(3) prioritization scheme of arcing contact in arc-chutes (in interrupting process) sputtered metal foreign body is avoided
If the arcing contact contact material that arc-chutes cut-off electric arc controls the best or does not meets maker control
Standard, can cause arcing contact after repeatedly folding alternating current filter group capacitive load, and arcing contact surface is by huge
Big ablation, and at interrupting process sputtered metal foreign body, and metallic foreign body is to the electricity after arc-chutes drop-out current
Field produces impact and causes internal field densely distributed, arc-chutes internal flashover fault finally occurs.
Therefore the prioritization scheme of arcing contact is: static arc contact ablation is serious, mixes with the stirring of contact copper tungsten material
The uniformity is relevant with sintering process, finds that arcing contact ablation is serious, it should take more after disintegrating arc-chutes
Changing the measure of switch internal arcing contact, copper tungsten contact uses W skeleton pre-sintering process under vacuum condition, copper tungsten
The proportioning of contact in strict accordance with this type product by type approval test time used parameter (CuW70 or
CuW80)。
In improvement arcing contact technique raising chopper after insulation margin, according to the requirement of GB1984～2014, need
Supplement confirmatory type approval test project as follows:
1) breaker fracture Insulation Test；
2) short circuit current cut-offs and making test；
3) fitting with capacitor group BC1, BC2 test.
(4) prioritization scheme that interrupting porcelain insulator inwall is radially punctured by arc-chutes arcing contact is avoided
Avoid the solution that interrupting porcelain insulator inwall is radially punctured by arc-chutes arcing contact for equalizing capacitor
It is optimized with arc-chutes arrangement.The equalizing capacitor of existing chopper is same vertical with arc-chutes
Plane is arranged up and down, and its structure refer to shown in Fig. 8, and it includes the T-shaped body 2, this T-shaped body 2
The left and right sides is respectively fixedly connected with the first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 12, in the T-shaped body 2
The heart is provided with a circular hole, and the support for arranging with vertical direction is fixed and is connected.First interrupting porcelain insulator 11 He
Second interrupting porcelain insulator 12 is internal is provided with SF6Arc-chutes, the first interrupting porcelain insulator 11 and the second arc-chutes
The upside (can also be downside) of insulator 12 is respectively equipped with the first of identical with its length and parallel distribution and all presses
Porcelain shell for capacitor 41 and the second equalizing capacitor insulator 42, the first interrupting porcelain insulator 11 and the second arc-chutes porcelain
The distal end of set 12 is respectively arranged with outside first grading ring 32 outside grading ring 31 and second；First goes out
The proximal end of arc chamber insulator 11 and the second interrupting porcelain insulator 12 is respectively arranged with the first shading ring 51 and second
Shading ring 52.In this structure, interrupting porcelain insulator vertical plane same with equalizing capacitor insulator is arranged up and down,
Under chopper operates in moist rainy weather, upper and lower vertically arranged equalizing capacitor and arc-chutes can because
Its insulator surface water droplet drippage, reduces the atmospherical discharges gap between equalizing capacitor and arc-chutes, works as water droplet
Time frequently, under extreme conditions can be bridged by rainwater between equalizing capacitor insulator and arc-chutes, cause arc extinguishing
Room arcing contact forms voltage difference with equalizing capacitor insulator, thus occurs arcing contact to interrupting porcelain insulator inwall footpath
To puncturing.
Prioritization scheme: by equalizing capacitor insulator using arc-chutes axis as rotating shaft, half-twist, it is ensured that all
Piezoelectric capsule belongs to the left and right arrangement of horizontal plane with arc-chutes after transforming.
Refer to shown in Fig. 9 and Figure 10 after optimization, it includes the T-shaped body 2, the left and right of the T-shaped body 2
Both sides are respectively fixedly connected with one with SF6First interrupting porcelain insulator 11 and the second interrupting porcelain insulator of arc-chutes
12, this first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 12 are positioned at same straight line and (are certainly also at same
On one horizontal plane) on, the centre position of the T-shaped body 2 is provided with the support with vertical direction and fixes the circular hole being connected.
It is respectively arranged with one first equal on the horizontal plane at the first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 12 place
Piezoelectric capsule insulator 41 and the first equalizing capacitor insulator 42, wherein, the first equalizing capacitor insulator 41 He
First equalizing capacitor insulator 42 can be located at the first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 12 place is straight
The heteropleural of line, naturally it is also possible to be homonymy.
The distribution of substantially equal and parallel with the length of the first equalizing capacitor insulator 41 of first interrupting porcelain insulator 11,
First interrupting porcelain insulator 11 and the corresponding two ends of the first equalizing capacitor insulator 41 are all fixed by installing plate
Together, wherein, the two installing plate near one end of the T-shaped body 2 being fixed on the T-shaped body 2.
Install on one end of the T-shaped body 2 at the first interrupting porcelain insulator 11 and the first equalizing capacitor insulator 41
There is the first shading ring 51, away from one end of the T-shaped body 2, grading ring 31 outside first are installed at the two.With
Sample, the second interrupting porcelain insulator 12 is equal with the length of the second equalizing capacitor insulator 42 and parallel distribution,
Second interrupting porcelain insulator 12 and the corresponding two ends of the second equalizing capacitor insulator 42 are all fixed by installing plate
Together, wherein, the two installing plate near one end of the T-shaped body 2 being fixed on the T-shaped body 2.
Install on one end of the T-shaped body 2 at the second interrupting porcelain insulator 12 and the second equalizing capacitor insulator 42
There is secondary shielding ring 52, away from one end of the T-shaped body 2, grading ring 32 outside second are installed at the two.
After improving arc-extinguishing chamber of circuit breaker and equalizing capacitor insulator arrangement, wanting according to GB1984～2014
Ask, require supplementation with confirmatory type approval test project as follows:
(1) chopper entirety shock test.
Although the present invention is illustrated by specific embodiment, it will be appreciated by those skilled in the art that,
Without departing from the present invention, it is also possible to the present invention is carried out various conversion and equivalent substitutes.It addition,
For particular condition or application, the present invention can be made various amendment, without deviating from the scope of the present invention.Cause
This, the present invention is not limited to disclosed specific embodiment, and should include falling into the claims in the present invention model
Enclose interior whole embodiments.
Claims (6)
1. an alternating current filter 500kV porcelain knob breaker insulating properties optimization method, it is characterised in that
It comprises the following steps:
Step 1, judge 500kV porcelain knob breaker fault type, described fault type include external insulation therefore
Barrier and interior insulation fault, wherein, described interior insulation fault includes that repeated breakdown, contact sputtered metal foreign body cause
Interrupting porcelain insulator inwall is radially punctured by electric field distortion and arc-chutes arcing contact；
Step 2, when 500kV porcelain knob breaker fault type is external insulation fault, dry arcing distance is entered
Row optimizes；When 500kV porcelain knob breaker fault type attaches most importance to breakdown fault, improve arc-chutes SF6Gas
Body pressure or input phase selection separating brake function；When 500kV porcelain knob breaker fault type is contact splash gold
When genus foreign body causes electric field distortion, improve contact material；When 500kV porcelain knob breaker fault type is for going out
When interrupting porcelain insulator inwall is radially punctured by arc chamber arcing contact, optimize equalizing capacitor and arc-chutes arrangement.
Alternating current filter 500kV porcelain knob breaker insulating properties the most according to claim 1 optimize
Method, it is characterised in that the described method being optimized dry arcing distance is to lengthen interrupting porcelain insulator length,
And lengthen the equalizing capacitor insulator length corresponding with described interrupting porcelain insulator, to increase creep age distance simultaneously.
Alternating current filter 500kV porcelain knob breaker insulating properties the most according to claim 2 optimize
Method, it is characterised in that the described method being optimized dry arcing distance is former by single interrupting porcelain insulator
There is length up to reduce and add 200mm and by equalizing capacitor insulator corresponding for this single interrupting porcelain insulator
Original length increases corresponding length.
Alternating current filter 500kV porcelain knob breaker insulating properties the most according to claim 1 optimize
Method, it is characterised in that improve arc-chutes SF6The method of gas pressure intensity is at former arc-chutes SF6Gas pressure intensity
On the basis of increase 0.1MPa～0.2MPa.
Alternating current filter 500kV porcelain knob breaker insulating properties the most according to claim 1 optimize
Method, it is characterised in that the method optimizing equalizing capacitor and arc-chutes arrangement is by equalizing capacitor
Insulator and arc-chutes are changed to the left and right cloth in same level by the arrangement up and down of original vertical direction
Put structure.
Alternating current filter 500kV porcelain knob breaker insulating properties the most according to claim 1 optimize
Method, it is characterised in that the method for described judgement 500kV porcelain knob breaker fault type includes following step
Rapid:
Step 1, by 500kV porcelain knob breaker failure recovery equipment fault current waveform extract fault
Current Waveform Characteristics data, described fault current waveform characteristic includes after blow-out to the electric current that breaks down
Time t1, fault current duration t2 and fault current waveform feature；
Step 2, according to fault current waveform characteristic failure judgement type:
The first situation: when after blow-out to the electric current that breaks down time t1 not less than 400ms and be not more than
During 2000ms, when sustained breakdown electric current occurs in simultaneous faults current waveform, then fault type is external insulation fault；
The second situation: when after blow-out to the time t1 of the electric current that breaks down not less than 7ms and no more than 9ms,
Fault current duration t2 is less than or equal to 2ms, and high frequency unicast peak, high frequency occurs in simultaneous faults current waveform
Unicast oscillation peaks and the higher-order of oscillation decay in any one time, check interrupting porcelain insulator inwall whether occur burn
Erosion vestige, if ablation vestige does not occur in interrupting porcelain insulator inwall, then fault type is repeated breakdown, otherwise,
Then fault type is that interrupting porcelain insulator inwall is radially punctured by arc-chutes arcing contact；
The third situation: when after blow-out to the electric current that breaks down time t1 not less than 10ms and be not more than
During 100ms, when simultaneous faults current waveform is stable at normal current after there is repeatedly arcing blow-out, then failure classes
Type is that contact sputtered metal foreign body causes electric field distortion.
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| CN106529084A (en) * | 2016-12-05 | 2017-03-22 | 华南理工大学 | Construction method for vacuum circuit breaker switch-on transient state simulation model |
| CN106951579A (en) * | 2016-12-28 | 2017-07-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | The appraisal procedure of the single-phase repeated breakdown risk of alternating current filter group breaker |
| WO2017152634A1 (en) * | 2016-03-11 | 2017-09-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for evaluating flashover fault of ceramic column type circuit breaker of 220kv and above |
| CN109325314A (en) * | 2018-11-12 | 2019-02-12 | 西北工业大学 | A kind of low-voltage circuit breaker break performance optimization method based on grid voltage tester |
| CN110376515A (en) * | 2019-07-10 | 2019-10-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of DC high-speed switch direct current sky fills current breaking test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017152634A1 (en) * | 2016-03-11 | 2017-09-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for evaluating flashover fault of ceramic column type circuit breaker of 220kv and above |
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| CN106951579A (en) * | 2016-12-28 | 2017-07-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | The appraisal procedure of the single-phase repeated breakdown risk of alternating current filter group breaker |
| CN106951579B (en) * | 2016-12-28 | 2020-09-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for evaluating single-phase re-breakdown risk of circuit breaker in alternating-current filter group |
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| CN109325314B (en) * | 2018-11-12 | 2022-06-21 | 西北工业大学 | Low-voltage circuit breaker switching-on and switching-off performance optimization method based on grid plate voltage test |
| CN110376515A (en) * | 2019-07-10 | 2019-10-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of DC high-speed switch direct current sky fills current breaking test method |
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Effective date of registration: 20220518 Address after: No. 223, Kexue Avenue, Huangpu District, Guangzhou, Guangdong 510700 Patentee after: MAINTENANCE & TEST CENTRE, CSG EHV POWER TRANSMISSION Co. Patentee after: Dali Bureau of China Southern Power Grid Co., Ltd. EHV transmission company Address before: 510663 maintenance and test center, building 2, 223 science Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee before: MAINTENANCE & TEST CENTRE, CSG EHV POWER TRANSMISSION Co. |