CN105956263B - 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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- CN105956263B CN105956263B CN201610280202.5A CN201610280202A CN105956263B CN 105956263 B CN105956263 B CN 105956263B CN 201610280202 A CN201610280202 A CN 201610280202A CN 105956263 B CN105956263 B CN 105956263B
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- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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
Insulating properties under alternating current-direct current operating mode are used in 500kV porcelain knob breakers the present invention relates to alternating current filter to optimize
Method, it is by analyzing influence of alternating current filter (hereinafter referred to as ACF) exceptional operating conditions to breaker insulating properties, pin
The insulating properties optimization method of alternating current filter breaker is proposed to property.
Background technology
ACF is with 500kV porcelain knob breaker interrupting processes, due to the change of systematic parameter and condition of work, can cause
Electromagnetic energy conversion between capacitor and inductance, causes internal overvoltage.Need to bear alternating current-direct current upon opening, between fracture simultaneously
Mix overvoltage collective effect, this be common AC system breaker without operating condition.In addition, in DC converter station
Alternating current filter pool-size is big, and switching frequently, will except the routine that should meet general AC circuit breaker when its Circuit Breaker Switching is operated
Ask outer, contact needs to bear the mechanical wear of the accumulation ablation and frequent operation shoved when closing a floodgate.These are likely to be shadow
Ring the factor of filter and breaker safe operation.
The difference that alternating current filter is primarily present with breaker and normal circuit breaker has at 3 points：
(1) ACF breakers need to cut off capacitive load, transient recovery voltage TRV (Transient Recover Voltage)
It is higher, breaker repeated breakdown may be caused, it is necessary to be used for the circuit breaker type of switching alternating current filter in technical specifications requirement
Formula tests verification experimental verifications of the TRV by 1470kV, and this numerical requirements is advised than GB1984-2014, GB11022-2011 correlation
Definite value is harsh.
(2) AC filter and breaker switching is frequent, according to the every group of ACF breaker that to each current conversion station statistical result, be averaged
200 times/month, and general exchange every group of open and close times of 1 year of field circuit breaker all do not reach 60 times, during switching, frequently
Contact mechanical wear, the arc erosion of inrush phenomenon and cut-off capacitive load TRV to the test of dielectric and bear hand over
Direct current mixed-voltage, makes ACF breakers operate under a severe operating mode, to breaker insulating Design itself and assembling
Technique proposes higher requirement.
(3) ACF breakers need to use combined floodgate phase selection device, and the dispersiveness to breaker time response requires very strict,
Each producer requires different, according to standard《GB/T 30846-2014 have predetermined interpolar not synchronous operation high-voltage AC breaker》
It is required that, breaker must assure that the deviation of single fracture branch wire time within ± 1ms.
Current inner breaker manufactory of state is less for the insulation characterisitic and reliable Journal of Sex Research of ACF breakers, except
According to technical specifications requirement, carry out breaker TRV 1470kV resistance tests and suggestion installed additional outside phase selection closing-opening device,
Its structure has no too big difference with technical conditions and regular alternating current field circuit breaker.On the whole, both at home and abroad at present for breaker
The insulation characterisitic research mixed in alternating current-direct current under superposition is few, therefore the insulating properties of the breaker for ACF are still continued to use
Conventional insulating Design, causes Frequent Troubles, according to statistics between 2014~2015 years, certain model breaker there occurs in NZ current conversion stations
Repeated breakdown inside 8 arc-chutes, 1 blast and 3 external insulation flashovers, another model breaker there occurs 1 in QX current conversion stations
Secondary explosion accident.
Therefore, patent of the present invention will propose a kind of influence based on alternating current filter group alternating current-direct current superimposition condition to breaker
The optimization method of breaker insulating properties can be effectively improved.
The content 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 to breaker
Influence, proposes to improve the optimization method of breaker insulating properties, it is ensured that breaker is in frequent switching alternating current filter group and passes through
In the case of by higher transient recovery voltage, will not occur the insulation such as repeated breakdown and external insulation flashover event inside arc-chutes
Barrier.
To achieve the above object, the present invention is adopted the technical scheme that：
A kind of alternating current filter 500kV porcelain knob breaker insulating properties optimization methods, it comprises the following steps：
Step 1, judge 500kV porcelain knob breaker fault types, the fault type include external insulation failure and it is interior absolutely
Reason hinders, wherein, the interior insulation failure, which includes repeated breakdown, contact sputtered metal foreign matter, causes electric field distortion and arc-chutes arc
Contact radially punctures to interrupting porcelain insulator inwall；
Step 2, when 500kV porcelain knob breakers fault type be external insulation failure when, dry arcing distance is optimized；When
500kV porcelain knob breaker fault types attach most importance to breakdown fault when, improve arc-chutes SF6Gas pressure intensity or input phase selection separating brake
Function；When 500kV porcelain knob breakers fault type is that contact sputtered metal foreign matter causes electric field distortion, contact material is improved
Matter；When 500kV porcelain knob breakers fault type is that arc-chutes arcing contact radially punctures to interrupting porcelain insulator inwall, optimization is equal
Piezoelectric capsule and arc-chutes arrangement.
Described is to lengthen interrupting porcelain insulator length to the method that dry arcing distance is optimized, and is lengthened and the arc extinguishing simultaneously
The corresponding equalizing capacitor insulator length of room insulator, to increase creep age distance.
Described is that single interrupting porcelain insulator up to reduces in original length to the method that dry arcing distance is optimized
Plus 200mm and the corresponding equalizing capacitor insulator of the single interrupting porcelain insulator is increased corresponding long on original length
Degree.
Improve arc-chutes SF6The method of gas pressure intensity is in former arc-chutes SF6On the basis of gas pressure intensity increase 0.1MPa~
0.2MPa。
The method for optimizing equalizing capacitor and arc-chutes arrangement is by original by equalizing capacitor insulator and arc-chutes
The arrangement up and down of vertical direction be changed to left and right arrangement in same level.
The method of the judgement 500kV porcelain knob breaker fault types comprises the following steps：
Step 1, pass through in 500kV porcelain knob breaker failure recovery equipment fault current waveform extract fault current waveform
Characteristic, time t1, the fault current that the fault current waveform characteristic includes after blow-out to failure electric current is held
Continuous time t2 and fault current waveform feature；
Step 2, according to fault current waveform characteristic failure judgement type：
The first situation：When the time t1 after blow-out to failure electric current is not less than 400ms and no more than 2000ms,
When sustained breakdown electric current occurs in simultaneous faults current waveform, then fault type is external insulation failure；
Second of situation：Time t1 to failure electric current after blow-out is not less than 7ms and no more than 9ms, failure electricity
Duration t2 is flowed less than or equal to 2ms, and high frequency unicast peak, high frequency unicast oscillation peaks and high frequency occurs in simultaneous faults current waveform
During any of oscillatory extinction, check whether interrupting porcelain insulator inwall ablation vestige occurs, if interrupting porcelain insulator inwall does not have
Ablation vestige is occurred, then fault type is repeated breakdown, conversely, then fault type is arc-chutes arcing contact in interrupting porcelain insulator
Wall radially punctures；
The third situation：When the time t1 after blow-out to failure electric current is not less than 10ms and no more than 100ms, together
When fault current waveform when occurring being stable at normal current after multiple arcing blow-out, then fault type is contact sputtered metal foreign matter
Cause electric field distortion (causing arc-chutes internal electric field to be distorted).
Compared with prior art, its advantage is the present invention：It can be differentiated exactly because of this by the appraisal procedure
Body insulating Design proposes different improve less than the fault type of 500KV porcelain knob double-fracture breakers according to different faults type
Breaker insulating properties optimization method, it is ensured that breaker is in frequent switching alternating current filter group and is subjected to higher transient recovery
In the case of voltage, it is to avoid occur the insulation fault such as repeated breakdown and external insulation flashover inside arc-chutes.
Brief description of the drawings
Fig. 1 is a kind of flow chart of alternating current filter of the invention 500kV porcelain knob breaker insulating properties optimization methods；
Fig. 2 is the flow chart of fault type determination methods；
Fig. 3 is the typical waveform that fault current is breakdown current；
Fig. 4 is the typical waveform that fault current is high frequency unicast peak；
Fig. 5 is the typical waveform that fault current is high frequency unicast oscillation peaks；
Fig. 6 is that fault current is the typical waveform that the higher-order of oscillation is decayed；
Fig. 7 is that fault current is to be stable at the typical waveform of normal current after multiple 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 for Fig. 9 A to structural representation.
Embodiment
Present disclosure is described in further details with reference to the accompanying drawings and detailed description.
Embodiment
First, the statistical analysis based on ACF breaker insulation fault types
According to domestic and international ACF breakers insulation fault defect statistics, ACF porcelain knob breaker insulation faults are broadly divided into 4
Class, be respectively：1) arc-chutes dry arcing distance deficiency causes occur external insulation flashover in moist rainy weather；2) after arc-chutes blow-out
Repeated breakdown occurs between arcing contact；3) arcing contact sputtered metal foreign matter causes the distortion of arc-chutes internal electric field to go out in arc-chutes
Existing internal flashover；4) equalizing capacitor and arc-chutes arrangement it is improper cause equalizing capacitor and arc-chutes exist larger voltage difference from
And arcing contact occur and interrupting porcelain insulator inwall is radially punctured.
The flow of ACF breakers insulating properties optimization
It refer to shown in Fig. 1, the method for ACF breakers insulating properties optimization is to include the signature waveform according to faulty equipment
Judge the fault type of breaker, different solutions are then provided according to different fault types.Wherein：
2nd, the determination methods of fault type
Signature waveform refers to the wave character parameter of the fault current when occurring flashover, and each class arcing fault has it special
Different waveform, wave character parameter, which is stored in the feature comprising all arcing faults in wave character parametric data storehouse, database, joins
Measure data.Specific determination methods refer to shown in Fig. 2, and it comprises the following steps：
(1) fault current waveform characteristic, the failure electricity, are extracted by fault current waveform in failure recovery equipment
Flowing waveform feature data includes the time t1, fault current duration t2, fault current ripple after blow-out to failure electric current
Shape feature, and check whether interrupting porcelain insulator inwall has ablation vestige.
(2), the characteristic parameter of above-mentioned fault current waveform characteristic and wave character parametric data storehouse is contrasted,
Failure judgement type：
Wherein, wave character parameter includes following four situation：
The first situation：Time t1 after blow-out (breaker disconnection) to failure electric current is not less than 400ms and not
During more than 2000ms, there is sustained breakdown electric current in fault current waveform, if extracting fault current waveform characteristic such a
In the case of, then fault type is judged as external insulation failure.
Fault current waveform the situation of sustained breakdown electric current occurs as shown in figure 3, the wave character of sustained breakdown electric current is
Duration length (is more than 2ms), and Wave crest and wave trough is continuously alternately present repeatedly, and the difference between crest value and between valley value
It is little.
Second of situation：Time t1 to failure electric current after blow-out is not less than 7ms and no more than 9ms, failure electricity
Duration t2 is flowed less than or equal to 2ms, and high frequency unicast peak, high frequency unicast oscillation peaks and high frequency occurs in simultaneous faults current waveform
One of oscillatory extinction, and there is not ablation vestige in interrupting porcelain insulator inwall, and fault type in such cases is attached most importance to
Puncture.
It refer to shown in Fig. 4, the wave character that high frequency unicast peak occurs in fault current waveform is that the duration is short (no more than
2ms), there is inferred-zero electric current between at least continuous two crests, two crests, and two crest value differences are larger.It refer to
Shown in Fig. 5, the wave character that high frequency unicast oscillation peaks occurs in fault current waveform is that the duration is short (being not more than 2ms), is occurred
Electric current returns to zero point after one crest, the crest.It refer to shown in Fig. 6, the ripple of higher-order of oscillation decay occurs in fault current waveform
Shape is characterized in that the duration is short (being not more than 2ms), and Wave crest and wave trough is continuously alternately present repeatedly, and crest value and valley value are gradually
Reduce.
The third situation：Time t1 to failure electric current after blow-out is not less than 7ms and no more than 9ms, failure electricity
Duration t2 is flowed less than or equal to 2ms, and high frequency unicast peak, high frequency unicast oscillation peaks and high frequency occurs in simultaneous faults current waveform
One of oscillatory extinction, and interrupting porcelain insulator inwall has ablation vestige, and fault type in such cases is arc-chutes arc
Contact radially punctures to interrupting porcelain insulator inwall.
4th kind of situation：When the time t1 after blow-out to failure electric current is not less than 10ms and no more than 100ms, together
When fault current waveform there is multiple arcing blow-out after be stable at normal current.
If extracting fault current waveform characteristic in this case, fault type is judged as contact sputtered metal
Foreign matter causes electric field distortion.It refer to shown in Fig. 7, fault current waveform is stable at normal current after there is multiple arcing blow-out
Wave character is uncertain for fault current duration, multiple arcing blow-out (Fig. 7 dashed boxes part) occurs.
Above-mentioned determination methods can pass through arcing fault Current Waveform Characteristics database Quick breaker arcing fault class
Type.
3rd, breaker insulating properties optimisation technique scheme
(1) prioritization scheme of external insulation failure, is avoided
External insulation failure generally comprises the rain sudden strain of a muscle caused by rainwater, ice, filth and water smoke difference, ice sudden strain of a muscle, pollution flashover and mist
Dodge.Its Optimized Measures is optimization dry arcing distance.
Operation feelings of the LW15A-550 types in alternating current filter group are opened according to external ABB HPL550 types and domestic west
Condition, when finding list porcelain knob breaker double-fracture dry arcing distance ＜ 2*2150mm, freezes in moist unnecessary weather or low temperature
Under weather, after breaker excision alternating current filter capacitive load, repeatedly occurs external insulation flashover failure.
Therefore, for ACF breakers because dry arcing distance deficiency causes the situation of external insulation performance, lengthening can be taken to go out
The prioritization scheme of arc chamber dry arcing distance, it is ensured that breaker dry arcing distance>2*2200mm, below with NZ current conversion station breaker optimization cases
Exemplified by example：
Because NZ current conversion station humidities are rainy, arc extinguishing outdoor face resistance declines, and external insulation may be caused to puncture, so needing
External Insulation ability is strengthened.According to product situation, arc extinguishing outdoor insulation Optimized Measures are：
1) interrupting porcelain insulator 200mm is lengthened, increases creep age distance.
2) equalizing capacitor insulator 200mm is lengthened, increases creep age distance.
Design parameter before and after interrupting porcelain insulator and porcelain shell for capacitor are improved is shown in Table 1.
Parameter comparison before and after the interrupting porcelain insulator of table 1 and porcelain shell for capacitor are improved
When ACF breakers are under alternating current-direct current superimposition condition, original product interrupting porcelain insulator surface maximum field intensity is
Interrupting porcelain insulator surface maximum field intensity is 1.63kV/mm after 1.64kV/mm, transformation, is held essentially constant, but insulator adds
Insulator creep age distance increases after length, and corresponding antifouling work ability may be significantly raising.
Improve after breaker external insulation dry arcing distance, according to the requirement of GB1984~2014, change the original type of breaker
Number structure is, it is necessary to supplement confirmatory type approval test, it is contemplated that be replaced by king-size arc-chutes to existing interrupting porcelain insulator
Insulator, the type approval test project that need to be supplemented is as follows：
1) a full set of type approval test of interrupting porcelain insulator；
2) breaker fracture Insulation Test；
3) temperature rise test；
4) leakage test；
Above-mentioned each experiment and following supplement proving test are the type approval test under being required in GB1984~2014,
Its specific test method is referred to standard execution, repeats no more here.
(2) arc-chutes, are avoided to occur the prioritization scheme of repeated breakdown
1st, (arc-chutes SF is referred in former arc-chutes air pressure6Gas pressure intensity) on the basis of improve 0.1MPa~0.2MPa.
The reason for repeated breakdown occurs for arc-chutes arcing contact mainly under alternating current-direct current mixed flow regime after cut-offfing capacitive load, is gone out
The design of arc chamber insulation margin is relatively low, and arcing contact has just divided time point to there is randomness, and when just, point time point is attached in electric arc zero crossing
When near, arcing contact is due to opening away from too small, and transient recovery voltage is more than contact breakdown voltage between causing contact, repeated breakdown occurs.
Therefore according to the nargin of interrupting porcelain insulator bearing capacity on the basis of former arc-chutes air pressure, it may be selected to improve gas
Pressure 0.1MPa~0.2MPa, can effectively improve the insulation margin of arc-chutes, according to SF6 gas-insulated nargin calculation formula(ρ：Absolute pressure after the raising of arc-chutes gas, ρ0：The absolute pressure of former arc-chutes gas) can calculate insulation it is abundant
It is 1.1~1.2 times or so that degree, which improves ratio,.
Pressure Density Distribution under two kinds of operation pressures is contrasted, parameter is shown in Table 2 and table 3.
The pressure intensity parameter of table 2 is distributed
The density parameter of table 3 is distributed
As can be seen that with the gradually increase of operating pressure, intraventricular pressure of calming the anger gradually increases by force, air-flow is by between contact
Clearance flow is to pull bar direction, and the increased trend with operating pressure increase is also presented in the air pressure in pull bar, between spout and static contact
Overall increased trend is also presented in pressure at gap.But on the whole, with the change of operating pressure, the trend of pressure distribution is phase
With.
After arc-chutes gas pressure intensity is improved, 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
Electric field and air-flow field analysis before and after by being improved to product gas, improved structure, because specified pressure is carried
Height, SF6 gas pressure intensities and density are improved, and are conducive to improving arc-chutes built-in electrical insulation and break performance.
Improve arc-chutes air pressure to improve after breaker interior insulation nargin, according to the requirement of GB1984~2014, it is necessary to supplement
Confirmatory type approval test project is as follows：
1) breaker fracture Insulation Test；
2) short circuit current flow is cut-off and making test；
3) leakage test；
4) fitting with capacitor group BC1, BC2 is tested.
2nd, phase selection separating brake control function is put into breaker
ACF breakers generation repeated breakdown is related to the arc time, and when the border that sound arcing contact has just divided, current waveform has been approached
Zero crossing, and current amplitude very little (200-300A), at this moment the powerful air-flow of air cylinder electric current can be put out by spout, putting out
Medium recovery strength between 7ms-9ms after arc, arcing contact is likely lower than transient recovery voltage amplitude (1-coswt) Um, so as to send out
Raw repeated breakdown.
Put into after phase selection separating brake control function, the border for making arcing contact just divide, delayed more than 90 ° (i.e. firm timesharing of current waveform
Between point advance current zero crossing 5ms), now sound arcing contact relative motion and arcing 5ms, when current zero-crossing point, arcing contact
Open away from enough distances, the breakdown voltage between contact is accordingly improved.
When arc-extinguishing chamber of circuit breaker built-in electrical insulation margin design is not enough, arcing contact is determined in the difference at just point time point
When electric arc zero crossing extinguishes, arcing contact open away from size, and open away from the breakdown voltage with arcing contact in SF6The certain situation of air pressure
Lower direct proportionality.Therefore, phase selection separating brake control function is put into, the time of arc-chutes arcing contact arcing can be effectively controlled,
Ensure when current zero-crossing point blow-out, arcing contact open away from distance will not be by over-voltage breakdown.
Put into phase selection separating brake function to improve after breaker interior insulation nargin, according to the requirement of GB1984~2014, it is necessary to mend
Fill confirmatory type approval test project as follows：
1) breaker double-fracture time synchronism is tested；
2) breaker double-fracture branch wire time dispersivity test
3) phase selection switching-off device and breaker united test, including：Atmospheric environment test, mechanical test, electric insulation examination
Test and EMC test.
(3) prioritization scheme of arcing contact in arc-chutes (in interrupting process) sputtered metal foreign matter is avoided
If the arcing contact contact material that arc-chutes cut-off electric arc controls not good or does not meet manufactory's control standard,
It can cause arcing contact after multiple folding alternating current filter group capacitive load, arcing contact surface is being opened by huge ablation
Disconnected process sputtered metal foreign matter, and metallic foreign body produces influence to the electric field after arc-chutes drop-out current and causes internal field to be distributed
It is intensive, finally there is arc-chutes internal flashover failure.
Therefore the prioritization scheme of arcing contact is：Static arc contact ablation is serious, with contact copper tungsten material degree of being uniformly mixed
It is relevant with sintering process, serious to discovery arcing contact ablation after arc-chutes disintegration, it should take replacing switch internal arcing contact
Measure, copper tungsten contact uses W skeleton pre-sintering process under vacuum condition, and the proportioning of copper tungsten contact is produced in strict accordance with the model
The parameter (CuW70 or CuW80) used when product are by type approval test.
Improve arcing contact technique to improve after breaker interior insulation nargin, according to the requirement of GB1984~2014, it is necessary to supplement
Confirmatory type approval test project is as follows：
1) breaker fracture Insulation Test；
2) short circuit current flow is cut-off and making test；
3) fitting with capacitor group BC1, BC2 is tested.
(4) prioritization scheme for avoiding arc-chutes arcing contact from radially puncturing interrupting porcelain insulator inwall
It is with going out to equalizing capacitor to the solution that interrupting porcelain insulator inwall radially punctures to avoid arc-chutes arcing contact
Arc chamber arrangement is optimized.The equalizing capacitor of existing breaker is to be arranged above and below same vertical plane with arc-chutes,
Its structure refer to shown in Fig. 8, and it includes the T-shaped body 2, and the left and right sides of the T-shaped body 2 is respectively fixedly connected with the first arc-chutes
The interrupting porcelain insulator 12 of insulator 11 and second, the T-shaped center of the body 2 is provided with a circular hole, for consolidating with the support that vertical direction is set
Fixed connection.SF is provided with inside first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 126Arc-chutes, the first interrupting porcelain insulator
11 and second the upside (can also be downside) of interrupting porcelain insulator 12 be respectively equipped with the first of identical with its length and parallel distribution
The equalizing capacitor insulator 42 of equalizing capacitor insulator 41 and second, the first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 12 it is remote
End end is respectively arranged with the first outside grading ring 31 and the second outside grading ring 32；First interrupting porcelain insulator 11 and the second arc extinguishing
The proximal end of room insulator 12 is respectively arranged with the first shading ring 51 and secondary shielding ring 52.In the structure, interrupting porcelain insulator with
Arranged above and below the same vertical plane of equalizing capacitor insulator, when breaker is operated under moist rainy weather, vertical cloth up and down
The equalizing capacitor put can be because its insulator surface water droplet be dripped with arc-chutes, the sky reduced between equalizing capacitor and arc-chutes
Gas discharging gap, when water droplet is frequent, can be bridged by rainwater between equalizing capacitor insulator and arc-chutes, lead under extreme conditions
Arc-chutes arcing contact and equalizing capacitor insulator formation voltage difference are caused, interrupting porcelain insulator inwall is radially hit so as to occur arcing contact
Wear.
Prioritization scheme：By equalizing capacitor insulator using arc-chutes axis as rotating shaft, it is rotated by 90 °, it is ensured that equalizing capacitance
Device belongs to the left and right arrangement of horizontal plane after being transformed with arc-chutes.
Refer to shown in Fig. 9 and Figure 10 after optimization, it includes the T-shaped body 2, and the left and right sides of the T-shaped body 2 is fixed respectively
Connection one carries SF6The first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 12 of arc-chutes, the He of the first interrupting porcelain insulator 11
Second interrupting porcelain insulator 12 is located on same straight line (being also at certainly in same level), and the centre position of the T-shaped body 2 is provided with
The circular hole being fixedly connected with the support of vertical direction.Horizontal plane where first interrupting porcelain insulator 11 and the second interrupting porcelain insulator 12
On be respectively arranged with one first equalizing capacitor insulator 41 and the first equalizing capacitor insulator 42, wherein, the first equalizing capacitor
The equalizing capacitor insulator 42 of insulator 41 and first can be located at the first interrupting porcelain insulator 11 and the place straight line of the second interrupting porcelain insulator 12
Heteropleural, naturally it is also possible to be homonymy.
First interrupting porcelain insulator 11 and the length of the first equalizing capacitor insulator 41 is of substantially equal and parallel distribution, and first goes out
The corresponding two ends of the equalizing capacitor insulator 41 of arc chamber insulator 11 and first are fixed together by installing plate, wherein, the two
The installing plate of one end of the close T-shaped body 2 is simultaneously fixed on the T-shaped body 2.In the first interrupting porcelain insulator 11 and the first equalizing capacitance
Device insulator 41 is provided with the first shading ring 51 on one end of the T-shaped body 2, is provided with the two one end away from the T-shaped body 2
First outside grading ring 31.Likewise, the equal length of the second interrupting porcelain insulator 12 and the second equalizing capacitor insulator 42 and flat
Row distribution, the second interrupting porcelain insulator 12 and the corresponding two ends of the second equalizing capacitor insulator 42 are fixed on one by installing plate
Rise, wherein, the two close to one end of the T-shaped body 2 installing plate and be fixed on the T-shaped body 2.In the He of the second interrupting porcelain insulator 12
Second equalizing capacitor insulator 42 is provided with secondary shielding ring 52 on one end of the T-shaped body 2, at the two away from the T-shaped body 2
One end the second outside grading ring 32 is installed.
Arc-extinguishing chamber of circuit breaker is improved with after equalizing capacitor insulator arrangement, according to the requirement of GB1984~2014, needing
Supplement confirmatory type approval test project as follows：
(1) the overall shock test of breaker.
Although the present invention is illustrated by specific embodiment, it will be appreciated by those skilled in the art that, do not departing from
In the case of the scope of the invention, various conversion and equivalent substitute can also be carried out to the present invention.In addition, for particular condition or answering
With various modifications can be made to the present invention, without departing from the scope of the present invention.Therefore, the present invention is not limited to disclosed tool
Body embodiment, and whole embodiments for falling within the scope of the appended claims should be included.
Claims (3)
1. a kind of alternating current filter 500kV porcelain knob breaker insulating properties optimization methods, it is characterised in that it includes following
Step：
Step 1, judge 500kV porcelain knob breaker fault types, the fault type include external insulation failure and interior insulation therefore
Barrier, wherein, the interior insulation failure, which includes repeated breakdown, contact sputtered metal foreign matter, causes electric field distortion and arc-chutes arcing contact
Interrupting porcelain insulator inwall is radially punctured；
Step 2, when 500kV porcelain knob breakers fault type be external insulation failure when, dry arcing distance is optimized；When
500kV porcelain knob breaker fault types attach most importance to breakdown fault when, improve arc-chutes SF6Gas pressure intensity or input phase selection separating brake
Function；When 500kV porcelain knob breakers fault type is that contact sputtered metal foreign matter causes electric field distortion, contact material is improved
Matter；When 500kV porcelain knob breakers fault type is that arc-chutes arcing contact radially punctures to interrupting porcelain insulator inwall, optimization is equal
Piezoelectric capsule and arc-chutes arrangement,
Described is to lengthen interrupting porcelain insulator length to the method that dry arcing distance is optimized, and is lengthened and the arc-chutes porcelain simultaneously
Corresponding equalizing capacitor insulator length is covered, to increase creep age distance；
The method of optimization equalizing capacitor and arc-chutes arrangement is that equalizing capacitor insulator and arc-chutes are hung down by original
Nogata to arrangement up and down be changed to left and right arrangement in same level；
The method of the judgement 500kV porcelain knob breaker fault types comprises the following steps：
Step 1, pass through in 500kV porcelain knob breaker failure recovery equipment fault current waveform extract fault current waveform feature
Data, when the fault current waveform characteristic continues including the time t1 after blow-out to failure electric current, fault current
Between t2 and fault current waveform feature；
Step 2, according to fault current waveform characteristic failure judgement type：
The first situation：When the time t1 after blow-out to failure electric current is not less than 400ms and no more than 2000ms, simultaneously
When sustained breakdown electric current occurs in fault current waveform, then fault type is external insulation failure；
Second of situation：Time t1 to failure electric current after blow-out is not less than 7ms and no more than 9ms, and fault current is held
Continuous time t2 is less than or equal to 2ms, and high frequency unicast peak, high frequency unicast oscillation peaks and the higher-order of oscillation occurs in simultaneous faults current waveform
During any of decay, check whether interrupting porcelain insulator inwall ablation vestige occurs, if interrupting porcelain insulator inwall does not go out
Existing ablation vestige, then fault type is repeated breakdown, conversely, then fault type is arc-chutes arcing contact to interrupting porcelain insulator inwall footpath
To puncturing；
The third situation：When the time t1 after blow-out to failure electric current is not less than 10ms and no more than 100ms, while therefore
When barrier current waveform occurs being stable at normal current after multiple arcing blow-out, then fault type is that contact sputtered metal foreign matter causes
Electric field distortion.
2. alternating current filter according to claim 1 500kV porcelain knob breaker insulating properties optimization methods, its feature
It is, described is that single interrupting porcelain insulator up to reduces in original length to add to the method that dry arcing distance is optimized
The corresponding equalizing capacitor insulator of the single interrupting porcelain insulator is simultaneously increased corresponding length by 200mm on original length.
3. alternating current filter according to claim 1 500kV porcelain knob breaker insulating properties optimization methods, its feature
It is, improves arc-chutes SF6The method of gas pressure intensity is in former arc-chutes SF6On the basis of gas pressure intensity increase 0.1MPa~
0.2Mpa。
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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 |
| 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 |
| 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 |
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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. |