CN110045273A - A kind of SF6Contact of breaker ablation degree on-line monitoring method - Google Patents
A kind of SF6Contact of breaker ablation degree on-line monitoring method Download PDFInfo
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- CN110045273A CN110045273A CN201910231792.6A CN201910231792A CN110045273A CN 110045273 A CN110045273 A CN 110045273A CN 201910231792 A CN201910231792 A CN 201910231792A CN 110045273 A CN110045273 A CN 110045273A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The present invention relates to a kind of SF6Contact of breaker ablation degree on-line monitoring method.The present invention proposes a kind of monitoring SF from a brand-new angle6The method of contact of breaker ablation degree, this method and existing judgment method are not present with source problem and this method is to SF6What the rigid timesharing of breaker was carved directly monitor rather than indirect detection method.This method has comprehensively considered various factors from many aspects such as device design, installation site, safety, anti-interferences, improves the accuracy, accuracy and anti-interference ability of this method；It selects high-precision CCD measuring instrument and emf sensor as signal pickup assembly, realizes SF6The calibration at breaker rigid timesharing quarter and starting the arc moment.In addition, cost needed for this method is relatively low, practical, it is also convenient at present in operation SF6It is installed on breaker, is suitble to promote the use of.
Description
Technical field
The present invention relates to a kind of SF6Contact of breaker ablation degree on-line monitoring method.
Background technique
High pressure SF6Breaker is the key equipment and the very big primary equipment of usage amount of power grid and substation；High pressure SF6
Breaker should have when closing state can good conductive, the bases such as rated short circuit current can be cut off in a short time when disconnecting
This function；But during breaker cut-offs rated short circuit current, contact can due to electric arc generation and cause ablation, if
The serious scaling loss of contact of breaker just will affect the normal function of breaker, or even the tripping of breaker or drop-out current is caused to lose
The major accidents such as lose, it is more serious to may cause arc-extinguishing chamber of circuit breaker explosion, caused by loss far more than breaker itself valence
Value.Therefore, SF6The ablation degree of contact of breaker judges have great importance in State-Inspect of High-Voltage Circuit.Currently, SF6It is disconnected
The judgment method of the ablation degree of road device contact mainly has: breaker drop-out current weighted cumulative method and dynamic electric resistor --- row
Journey curve method etc.；But these methods have certain limitation, therefore, needing to study one kind being capable of accurate judgement SF6Open circuit
The on-line monitoring method of device contact ablation degree improves monitoring SF6The accuracy of contact of breaker ablation degree judgement, to realize
Electricity net safety stable, coordinated control provide technical guarantee and equipment guarantee.
Currently, SF6The judgment method of the ablation degree of contact of breaker mainly has: drop-out current weighted cumulative method and dynamic
Resistance --- stroke curve method etc..
Breaker drop-out current weighted cumulative method is a kind of method for monitoring breaker ablation degree on-line.This method according to
The electric life curve of breaker calculates the electrical wear amount Q of accumulation to the drop-out current weighted cumulative of breaker, with permission
Electrical wear total amount QgComparison, so only needing to monitor the virtual value of drop-out current.But this method does not account for breaker
Difference when operation between three-phase, when especially cut-offfing failure phase and non-faulting phase, if carried out with faulted phase current tired
If meter, the abrasion loss that non-faulting mutually adds up will be bigger than normal；In addition, this method is a kind of average statistics method, open and close times are more
It is more accurate, but the short circuit current cut-off every time is different, ablation amount is different, will generate bigger difference.Therefore this method can only be made
For a kind of method for substantially estimating ablation degree.
Dynamic electric resistor --- stroke curve method is a kind of method that current application relatively widely carries out contact state assessment.
This method eliminates the error as caused by wiring point contact resistance using four-wire method and then obtains dynamic electric resistor-stroke curve, leads to
It crosses analysis and obtains the size of contact of breaker dynamic electric resistor journey time and differential resistance values and using this result as breaker
The judgment basis of contact ablation degree.But the necessary off-line measurement of this method, the ablation journey of contact of breaker can not be learnt in real time
Degree, can only meet the needs inspected periodically, be unable to satisfy the demand of real time on-line monitoring, and need DC source and high-precision
Voltage measuring apparatus, equipment is huge and expensive, vulnerable to interference.
Summary of the invention
The present invention is using high-precision CCD measuring instrument, high-precision magnetic field sensor as signal pickup assembly.High-precision CCD
The distinctive gallium nitride green LED of measuring instrument measuring head provides short wavelength and reliable operation, be conducive to carry out accurately to detect and
Control.And high-precision magnetic field sensor can accurately capture the high frequency electromagnetic radiation generated by electric arc, and then accurately sentence
Disconnected SF out6The starting the arc moment of breaker.It may be generated due to collision effect during closing in view of moving contact fingertip larger dry
It disturbs, so only selection separating brake process carries out ablation degree diagnostic monitoring.In addition, sensor of the present invention not with breaker
Live part contact, stability, high reliablity and do not interfere with each other, be independent of each other with breaker high-pressure conductive part.
The content of present invention is mainly made of following steps:
Step 1: obtaining SF6Contact of breaker travel-time curve and dynamic resistance curve, calibration SF6Breaker main contact
Initially rigid quartile is set with arcing contact.
The present invention measures contact travel time graph using high-precision CCD tester；Main touching is determined using dynamic resistance method
T is carved in head just timesharing1T is carved with the rigid timesharing of arcing contact0；According to t1And t0It is rigid to demarcate main contact respectively on contact travel time graph
Quartile sets L1L is set with the rigid quartile of arcing contact0。
Calibration Circuit, will not be in open circuit as shown in Figure 1, additional DC current source size selected in Calibration Circuit is suitable
Device generates electric arc when acting.It tests power supply and selects direct current, the voltage that electric current generates on contact during measurement divide-shut brake, foundation
Ohm's law is handled to obtain the change curve of contact resistance between dynamic/static contact.
The installation method of high-precision CCD tester and thin insulating light barrier in the present invention is as shown in Fig. 2, high-precision CCD
Tester is arranged close to the position of drive rod, and thin insulating light barrier is fixed on insulating pull rod for breaker end, when breaker is dynamic
When making separating brake, thin insulating light barrier is moved by graphic arrow direction, and monitors fracture voltage and high-precision CCD simultaneously at this moment
The signal of tester.The dynamic resistance curve measured is as shown in figure 3, can be rigid as contact of breaker using fracture voltage jump signal
The mark that quartile is set.When fracture voltage monitors signal as shown in Figure 3, illustrate t0Moment is the rigid timesharing of breaker arcing contact
It carves, high-precision CCD tester records t0The light-blocking Board position at moment is as SF6The initial rigid quartile of contact of breaker is set (i.e. high-precision
Degree CCD tester record breaker arcing contact initially set by rigid quartile).In addition, light barrier can shielding light during breaker actuation
Line causes high-precision CCD tester receiving end light acceptance amount to change, so the variation of receiving end light acceptance amount can be passed through
Draw out the stroke curve of breaker as shown in Figure 3；It is bent at the same time it can also obtain contact of breaker speed according to stroke curve
Line.
Step 2: obtaining SF6Contact of breaker in the breaker course of work in real time set by rigid quartile.
Electric arc can be generated during breaker actuation, and then causes contact of breaker that ablation occurs, with breaker actuation
Number increases, and contact ablation degree is increasingly severe, and overtravel shortens, and breaker rigid timesharing quarter changes.So needing
It is a kind of being capable of the method set of the rigid quartile of real time on-line monitoring contact of breaker.Due to the breakdown process after contact separation, space is high
The electromagnetic radiation of frequency will be stronger, thus the judgement that can be carved by monitoring the electromagnetic radiation as the rigid timesharing of contact of breaker according to
According to.The present invention acquires the electromagnetic field signal of the electric arc generated at contact of breaker using high-precision magnetic field sensor, and breaker is dynamic
The collected magnetic field signal of sensor is as shown in Figure 3 when making.Test of many times shows t at the time of signal starts mutationmIt is as breaking
Device contact in real time carve by rigid timesharing, so can be using this method as the contact of breaker on-line monitoring side that rigid quartile is set in real time
Method.And tmThe rigid quartile of arcing contact corresponding to moment sets LmL should be set in the rigid quartile of main contact0It is set with the rigid quartile of arcing contact
L1Between.
Step 3: SF6The assessment of breaker arcing contact electric life.
According to contact of breaker, just quartile sets the moment and obtains contact ablation journey from breaker trip curve initially and in real time
Degree.It is bent that high-precision CCD tester, high-precision magnetic field sensor signal and breaker trip are acquired when each breaker actuation simultaneously
Line, and three road signals are plotted in same reference axis, as shown in Figure 3.The touching of breaker arc can be clearly obtained from Fig. 3
Just quartile has set the row with the breaker arcing contact time difference △ t and the two that initially rigid quartile is set on stroke curve to head in real time
Path difference △ L, the trip difference can characterize the ablation degree of contact of breaker.
In general, SF6The overtravel length of breaker is D, the ratio of the present invention progressive error △ L and the overtravel D of breaker
Judgment basis of the value k as breaker ablation degree.As k≤0.3, then determine that contact of breaker is good；When k=0.3~
When 0.5, then determines contact of breaker moderate ablation, provide caution signal；When k >=0.7 when, then determine contact of breaker ablation
Seriously, it needs to overhaul in time.
Detailed description of the invention
1. Fig. 1 is that rigid timesharing blaze determines circuit diagram, the applying direct current potential source in the circuit.
2. Fig. 2 schematic device, wherein each section it is entitled [1: 0 graduation position 2 of high-precision CCD measuring instrument receiving end:
Initially calibrated scale 3: high-precision CCD measuring instrument receiving end 4: thin insulating gear is carved in rigid timesharing for high-precision CCD measuring instrument receiving end
Tabula rasa 5: high-precision CCD measuring instrument transmitting terminal 6: moving contact of breaker drive rod 7: drive rod movement side when breaker open operation
To].
3. Fig. 3 is high-precision CCD measuring instrument and the waveform that high-precision magnetic field sensor monitors simultaneously, the two is drawn on together
In one reference axis, wherein each parameter is [t0: t is carved in the rigid timesharing of the contact of breaker of on-line monitoring1: contact of breaker initially rigid timesharing
Carve △ t: the time difference is carved in the rigid timesharing of contact of breaker].
Specific embodiment
The content of present invention is mainly made of following steps:
Step 1: installing sensor according to Fig. 2 mode.
Step 2: obtaining SF6Contact of breaker travel-time curve and dynamic resistance curve, calibration SF6Breaker main contact
Initially rigid quartile is set with arcing contact.
Step 3: obtaining SF6Contact of breaker in the breaker course of work in real time set by rigid quartile.
Step 4: SF6The assessment of breaker arcing contact electric life.
The key point of the application motion and point to be protected
Key point: the present invention is using a kind of SF based on the calibration of CCD measuring instrument6Contact of breaker initially set and magnetic by rigid quartile
The SF that field sensor is monitored on-line6The contact of breaker progressive error that rigid quartile is set in real time is as ablation degree judgment basis, sheet
Invention is using high-precision CCD measuring instrument as new installation SF6Breaker initially just divided location position sensor, the present invention in it is thin
Insulate light barrier when to guarantee that the lower edge of baffle is within the measurement range of high-precision CCD measuring instrument and the height of light barrier
It is greater than sensor measurement width, on-line measurement may be implemented in the present invention, the installation method of each module of the present invention and position.
Protect point: 1. using a kind of SF based on the calibration of CCD measuring instrument6Contact of breaker initially set and magnetic field biography by rigid quartile
The SF that sensor is monitored on-line6The contact of breaker progressive error that rigid quartile is set in real time is as ablation degree judgment basis；
2. the present invention is using high-precision CCD measuring instrument as new installation SF6Breaker has initially just divided the sensing of location position
Device；
3. to guarantee that the lower edge of baffle is in the measurement range of high-precision CCD measuring instrument in the present invention when thin insulating light barrier
Within and the height of light barrier be greater than sensor measurement width；
4. on-line measurement may be implemented in the present invention；
5. installation method and the position of each module of sensor.
Claims (4)
1. the present invention is a kind of SF6Contact of breaker ablation degree on-line monitoring method；High-precision CCD measuring instrument, high-precision magnetic field
Sensor, thin insulating light barrier, single-chip microcontroller and power module have been collectively constituted based on CCD measuring instrument and magnetic field sensor
SF6Contact of breaker ablation degree on-line monitoring method.
2. the present invention is using high-precision CCD measuring instrument as monitoring SF6The biography at contact of breaker initially rigid timesharing quarter and contact speed
Sensor, the transducer sensitivity and precision are high, and measurement accuracy reaches 0.3mm, can measure small displacement, accurately demarcate
SF6Contact of breaker initially set by rigid quartile；And high-precision magnetic field sensor can be realized SF6Contact of breaker in real time set by rigid quartile
Precise measurement.
3. the present invention proposes a kind of monitoring SF from a brand-new angle6The method of contact of breaker ablation degree, will high-precision
The SF that magnetic field sensor obtains6Rigid quartile sets the SF with the calibration of high-precision CCD measuring instrument to contact of breaker in real time6Contact of breaker
Judgment basis of the progressive error that quartile is set initial just as ablation degree；To guarantee to keep off when thin insulating light barrier is installed in the present invention
The lower edge of plate be within the measurement range of high-precision CCD measuring instrument and the height of light barrier to be greater than sensor measurement wide
Degree, such installation method are convenient for obtaining the contact speed and stroke curve of breaker.
4. the power module in the present invention is used to provide stable, suitable power supply to single-chip microcontroller and sensor, single-chip microcontroller is for locating
The collected signal of sensor institute is managed, power module and single-chip microcontroller are remotely from SF6The place of breaker electrification in high voltage part,
Both it will not influence the normal operation of breaker, and will not have been guaranteed the accurate of monitoring result by the interference of electromagnetic radiation at contact
Property.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910231792.6A CN110045273B (en) | 2019-03-26 | 2019-03-26 | SF (sulfur hexafluoride)6Online monitoring method for ablation degree of breaker contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910231792.6A CN110045273B (en) | 2019-03-26 | 2019-03-26 | SF (sulfur hexafluoride)6Online monitoring method for ablation degree of breaker contact |
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| CN110045273A true CN110045273A (en) | 2019-07-23 |
| CN110045273B CN110045273B (en) | 2021-04-30 |
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Cited By (3)
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| CN110571070A (en) * | 2019-08-22 | 2019-12-13 | 南方电网科学研究院有限责任公司 | method for evaluating breaking performance of circuit breaker |
| CN113311321A (en) * | 2021-05-27 | 2021-08-27 | 云南电网有限责任公司电力科学研究院 | Method for detecting three-phase arc extinguishing performance of circuit breaker based on separation algorithm |
| CN114252765A (en) * | 2021-12-14 | 2022-03-29 | 广西电网有限责任公司桂林供电局 | SF based on switching-on pre-breakdown6Method for evaluating ablation state of breaker contact |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110571070A (en) * | 2019-08-22 | 2019-12-13 | 南方电网科学研究院有限责任公司 | method for evaluating breaking performance of circuit breaker |
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| CN113311321A (en) * | 2021-05-27 | 2021-08-27 | 云南电网有限责任公司电力科学研究院 | Method for detecting three-phase arc extinguishing performance of circuit breaker based on separation algorithm |
| CN114252765A (en) * | 2021-12-14 | 2022-03-29 | 广西电网有限责任公司桂林供电局 | SF based on switching-on pre-breakdown6Method for evaluating ablation state of breaker contact |
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| CN110045273B (en) | 2021-04-30 |
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