CN106597271A - Post arc current measurement method based on current transfer characteristics and magnetic blowout - Google Patents
Post arc current measurement method based on current transfer characteristics and magnetic blowout Download PDFInfo
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- CN106597271A CN106597271A CN201611166827.5A CN201611166827A CN106597271A CN 106597271 A CN106597271 A CN 106597271A CN 201611166827 A CN201611166827 A CN 201611166827A CN 106597271 A CN106597271 A CN 106597271A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention relates to a post arc current measurement method without ground interference and with high precision based on current transfer characteristics and magnetic blowout. With the current transfer characteristics as a basis, with magnetic field arc blow as auxiliary, the isolation measurement of a measurement circuit and a main circuit is realized, and a ground interference signal is effectively avoided. At the same time, through transfer branch resistance parameter design and a magnetic blowout effect, the current of a resistance branch can be effectively controlled, thus a vacuum switch is switched off after a main current peak, and thus the control precision requirement of the vacuum switch is low. The method has the advantages of high measurement precision, less interference, and high reliability. In addition, through optical fiber isolation control and data communication, the on-line measurement of the post arc current of a power system can be satisfied.
Description
Technical field
The invention belongs to mesohigh chopper post-arc current fields of measurement, more particularly to one kind disturb without ground, it is high-precision
Based on current transfer characteristic and the post-arc current measuring method of magnetic blow-out.
Background technology
The subsequently construction and the increase of net capacity of country's intelligent grid, the protection switch-high pressure to high-voltage intelligent electrical network
Chopper is put forward higher requirement.Chopper when high current is cut-off, due to residual plasma body between arc gap after current over-zero,
In transient recovery voltage（TRV）In the presence of, there is post-arc current.Post-arc current can be used to judge the break performance of chopper,
It is the Important Parameters of chopper interrupting process.
At present, for one of the measuring method of post-arc current be using coaxial shunt, mechanical switch and portable protective gaps simultaneously
Connection, in the high current stage, due to mechanical switch resistance（Micro-ohm level）Much smaller than coaxial shunt resistance（Milliohm level）, high current master
To be undertaken by mechanical switch；Within 1 ~ 2ms before principal current zero passage, it is desirable to which mechanical switch quick acting switching-off, and then the starting the arc, electric current is opened
Begin from mechanical switch to coaxial shunt to shift, and be completely transferred on coaxial shunt before current over-zero, and then by coaxial
Post-arc current after diverter measurement principal current zero passage.This kind of method is to the thermal capacity of coaxial shunt and the control of mechanical switch
Required precision is high, and signal is weaker and disturbs with having.Also a kind of measuring method is straight using diverter or special Luo-coil
Connect measurement, but due to principal current it is too big with the difference in size of post-arc current（Principal current is typically in tens kilo-amperes, and post-arc current one
As 1 ~ 2 peace）, the current measure device such as diverter or special Luo-coil is difficult to bear high current again can be little with accurate measurement
Electric current, certainty of measurement is low, and the presence that high impedance, low heat capacity diverter are disturbed with also having, and special Luo-coil by
Then integrated signal and accurate absolute time signal cannot be obtained and designed complicated.
The content of the invention
The present invention is to solve the above-mentioned technical problem existing for prior art, there is provided a kind of without ground interference, high accuracy
Based on current transfer characteristic and the post-arc current measuring method of magnetic blow-out.
The present invention technical solution be：It is a kind of based on current transfer characteristic and the post-arc current measuring method of magnetic blow-out,
It is to be measured by the post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out, it is described based on current transfer characteristic and magnetic
The post-arc current measurement apparatus blown are provided with vacuum switch, and with the end of incoming cables of vacuum switch or leading-out terminal primary current sense is in series with
Device, is connected to the vacuum switch current sensor connected with contacts of vacuum switch between the end of incoming cables of vacuum switch and leading-out terminal,
Be parallel with portable protective gaps with the contacts of vacuum switch and vacuum switch current sensor being in series and the transfer resistance that is in series and
Transfer resistance current sensor, is fixed with the pulse transverse magnetic of relative vacuum switch contact in the vacuum extinction room of vacuum switch
Field coil, the output of the primary current sense device, vacuum switch current sensor and transfer resistance current sensor is and master control
Device processed connects, and with the input of master controller tested circuit-breaker status detector unit, the output of the master controller are also connected to
Connect with vacuum switch drive mechanism and pulse transverse magnetic field coil control unit；
The measuring method is carried out in accordance with the following steps：
A. tested chopper is controlled before principal current zero passage to cut-off；
B. the state of tested chopper is monitored；
C. whether cut-off according to the tested chopper of condition adjudgement of the tested chopper monitored；It is no, then it is considered as invalid and terminates
Measurement, is then to measure principal current I, vacuum switch branch current respectivelyI 1 And transfer resistance branch currentI sh ；
D. judge principal current whether through peak value；It is no, then it is considered as invalid and terminates measurement, it is then to control the separating brake of vacuum switch 1,
The 1.5ms starting impulses transverse magnetic field coil before principal current zero passage；
E. vacuum switch electric current is judgedI 1 Whether it is zero；It is no, then it is considered as invalid and terminates measurement, it is to calculateΔt 2 =t 2 -t e ,t 2 It is the moment of principal current zero passage,t e It isI 1 For zero moment；
F. judgeΔt 2 Whether 20 μ s are more than；It is no, then it is considered as invalid and terminates measurement, be, after record principal current I zero passageI sh 's
Reverse current, the post-arc current of as tested chopper；
G. the post-arc current for being detected is uploaded to into master controller, post-arc current measurement terminates.
The present invention, with magnetic field arc blow-out as auxiliary, realizes measuring loop with major loop based on current transfer characteristic
Isolation measurement, can be prevented effectively from ground interference signal；Simultaneously the present invention, can by transfer branch resistance parameter designing and magnetic blow-out effect
The electric current of effective control transfer resistance branch road so that vacuum switch separating brake after principal current peak value, therefore vacuum is opened
Close control accuracy requirement relatively low；Few, the high reliability with certainty of measurement height, interference.In addition, by Fiber isolation control
And data communication, the on-line measurement of power system post-arc current can be met.
Description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the pulse transverse magnetic field loop construction schematic diagram of the embodiment of the present invention.
Fig. 3 is the schematic block circuit diagram of the embodiment of the present invention.
Fig. 4 is the measuring method flow chart of the embodiment of the present invention.
Fig. 5 is the operation principle schematic diagram of the embodiment of the present invention.
Specific embodiment
The structure of the embodiment of the present invention is as shown in figure 1, be provided with vacuum switch 1, vacuum switch 1 is prior art, preferably
The vacuum switch that rapid repulsion mechanism drives.The structure of the vacuum switch that rapid repulsion mechanism drives is that have what is connected with contact to enter
Line end, leading-out terminal, vacuum interrupter, insulated tension pole, excess of stroke connector, rapid repulsion mechanism, displacement transducer, driving and intelligence
Control system and light communication end etc..The embodiment of the present invention is that the end of incoming cables 2 with vacuum switch 1 or contact leading-out terminal 3 are in series with
Primary current sense device 4, for detecting principal current I, be connected between the contact end of incoming cables 2 of vacuum switch 1 and contact leading-out terminal 3 with
The vacuum switch current sensor 6 of the series connection of contacts of vacuum switch 5, for detecting vacuum switch branch currentI 1,It is true with what is be in series
Empty switch contact 5 and vacuum switch current sensor 6 are parallel with portable protective gaps 7 and the transfer resistance 8 that is in series and transfer resistance
Current sensor 9, transfer resistance current sensor 9 is used to detect transfer resistance branch currentI sh .Each current sensor is using safe
Gram current sensor TCP303, its pulsed maximum current 500A, bandwidth 15MHz, certainty of measurement 5mA.Transfer resistance 8 is in high current
The electric current that stage bears will be much smaller than the maximum current after transfer, i.e. the resistance value of transfer resistance 8 is typically vacuum switch contact
20 ~ 1000 times of resistance.
Transfer resistance is preferably orthoscopic constantan-made resistances, the resistance of transfer resistance, the protection of portable protective gaps
Voltage, in formula：sFor the sectional area of transfer resistance,；lFor transfer electricity
The length of resistance,I m Based on current peak,Δt 2 Extinguish the time to principal current zero passage completely for Vacuum switching arc,mFor transfer electricity
The quality of resistance,ΔTIt is the highest operating temperature rise of transfer resistance material therefor,kFor the resistivity of transfer resistance material therefor,γIt is
The specific heat capacity of constantan 6J20.
The pulse transverse magnetic field coil 11 of opposing contact is fixed with the vacuum interrupter 10 of vacuum switch 1, it is produced
Pulse transverse magnetic field pulsewidth be 3ms, magnetic field intensity be 0 ~ 300Mt it is adjustable.Pulse transverse magnetic field coil 11 can be as shown in Figure 2
Nurse hertz coil suddenly, the internal diameter r1 of upper lower coil is 140mm, and external diameter r2 is 160mm, and high h is 150mm, the skeleton of upper lower coil
The circle of copper cash winding technique 600 can be met respectively, and finally upper and lower copper cash windings in series is got up and the electricity in two coils is caused
Stream direction is consistent.The skeleton of upper and lower two coils is fixed and horizontal by the installing hole arranged on coil rack by insulating supporting
To the centre position for being installed on vacuum interrupter 10.
Schematic block circuit diagram is as shown in Figure 3：Primary current sense device 4, vacuum switch current sensor 6 and transfer resistance electric current
The output of sensor 9 with master controller 12（Single-chip microcomputer, microprocessor etc.）Connect, also connect with the input of master controller 12
There are tested circuit-breaker status detector unit 13, output and vacuum switch drive mechanism 14 and the pulse transverse magnetic field of master controller 12
Coil control unit 15 connects.Tested circuit-breaker status detector unit 13 is by monitoring the distance between tested contact of breaker
Judge that tested chopper whether in state is cut-off, can realize that vacuum switch drives by displacement transducer and travel switch etc.
Motivation structure 14 can be the rapid repulsion mechanism of vacuum switch 1, and pulse transverse magnetic field coil control unit 15 is that control pulse is horizontal
Can be the control circuits such as storage capacitor and IGCT to the unit of field coil.
The measuring method flow process of embodiment of the present invention master controller is as shown in Figure 4：
Primary current sense device 4 is connected in the chopper such as high-pressure vacuum breaker or SF6 choppers loop.
Control tested chopper before principal current zero passage to cut-off（This order can be assigned by main control, also can be by manual
Control or other control device controls）；The state of tested chopper is monitored by tested circuit-breaker status detector unit 13；According to institute
Whether the tested chopper of condition adjudgement of the tested chopper of monitoring cut-offs；It is no, then it is considered as invalid and terminates measurement, it is then to lead to
Cross primary current sense device 4, vacuum switch current sensor 6 and transfer resistance current sensor 9 and measure principal current I, vacuum respectively
Switching branches electric currentI 1 And transfer resistance branch currentI sh ；Judge principal current whether through peak value；It is no, then it is considered as invalid and terminates
Measurement, is that then output signal controls the separating brake of vacuum switch 1, the 1.5ms before principal current zero passage by vacuum switch drive mechanism 14
By the starting impulse transverse magnetic field coil 11 of pulse transverse magnetic field coil control unit 15, pulse is produced in vacuum interrupter 10 horizontal
To magnetic field（Magnetic blow-out）；Judge vacuum switch electric currentI 1 Whether it is zero；It is no, then it is considered as invalid and terminates measurement, it is to calculateΔt 2 =t 2 -t e , t 2 It is the moment of principal current zero passage,t e It isI 1 For zero moment；JudgeΔt 2 Whether be more than 20 μ s, it is no, then be considered as it is invalid and
Terminate measurement, be, after record principal current I zero passageI sh Reverse current, then the post-arc current of as tested chopper will be examined
The post-arc current of survey uploads to master controller, and post-arc current measurement terminates.Master controller can be by integrating to post-arc current
Charge characteristic and post-arc current characteristic is analyzed to after arc, for judging that test product is switchedVI t Insulation characterisitic and electric INTERRUPTION LIFE.
The operation principle of the embodiment of the present invention is as shown in Figure 5：As described above,I、I 1 WithI sh It is respectively principal current（Main circuit
Electric current）, vacuum switch branch current and transfer resistance branch current.I B It is pulsed magnetic field electric current,TRVOpen for test product chopper
Transient recovery voltage during disconnected,I shm It is maximum that transfer resistance bears electric current,t 0 Witht e It is respectively the contact of vacuum switch 1
Separate the moment and vacuum arc extinguishes the moment（That is electric current transfer completes the momentI 1 =0）,t 2 It is the moment of principal current zero passage.In transfer
ProcessΔt 0 Stage：It is that the divided relation stage is met between transfer resistance 8 and the contact resistance of vacuum switch 1, transfer electricity
Resistance 8 it is general in milliohm level and contact resistance typically in micro-ohm level, so stage principal current I is mainly undertaken by vacuum switch.
In transfer processΔt 1 Stage：After the contact of vacuum switch 1 is separated, vacuum arc is produced, and principal current I starts by vacuum switch
1 is transferred on transfer resistance 8, and with the reduction of main circuit power current I, vacuum arc electric current is gradually reduced, additional horizontal
In the presence of pulsed magnetic field magnetic blow-out, vacuum arc is extinguished completely, and principal current I is completely transferred on transfer resistance branch road.In transfer
ProcessΔt 2 Stage：Vacuum arc is extinguished completely to principal current I zero passage, and the reverse current on transfer resistance branch road is electricity after arc
Stream.According to medium recovery speed after vacuum switch arc, the sheaths stage typically continues more than 20 μ s, in order to subtract after the arc of vacuum switch
The impact of vacuum switch stray capacitance parameter in little post-arc current measurement apparatus, needs controlΔt 2 Stage is far longer than 20 μ s.
Can be by carrying out self-supplying power source design to the embodiment of the present invention（I.e. bus current power taking and batteries to store energy set
Meter）, you can the post-arc current of on-line monitoring primary cut-out is realized, for the break performance for judging primary cut-out and electric longevity
Life, the repair based on condition of component for power system provides reliable data.
Claims (1)
1. it is a kind of based on current transfer characteristic and the post-arc current measuring method of magnetic blow-out, it is characterised in that to be by being shifted based on electric current
Characteristic and the post-arc current measurement apparatus of magnetic blow-out are measured, described to be measured based on current transfer characteristic and the post-arc current of magnetic blow-out
Device is provided with vacuum switch（1）, with vacuum switch（1）End of incoming cables（2）Or leading-out terminal（3）It is in series with primary current sense device
（4）, in vacuum switch（1）End of incoming cables（2）With leading-out terminal（3）Between be connected to and contacts of vacuum switch（5）The vacuum of series connection is opened
Powered-down flow sensor（6）, with the contacts of vacuum switch being in series（5）And vacuum switch current sensor（6）It is parallel between protection
Gap（7）And the transfer resistance being in series（8）With transfer resistance current sensor（9）, in vacuum switch（1）Vacuum interrupter
（10）Inside it is fixed with relative vacuum switch contact（5）Pulse transverse magnetic field coil（11）, the primary current sense device（4）, it is true
The powered-down flow sensor of air switch（6）And transfer resistance current sensor（9）Output and master controller（12）Connect, with main control
Device（12）Input be also connected to tested circuit-breaker status detector unit（13）, the master controller（12）Output and vacuum
Driving mechanism for switches（14）And pulse transverse magnetic field coil control unit（15）Connect；
The measuring method is carried out in accordance with the following steps：
A. tested chopper is controlled before principal current zero passage to cut-off；
B. the state of tested chopper is monitored；
C. whether cut-off according to the tested chopper of condition adjudgement of the tested chopper monitored；It is no, then it is considered as invalid and terminates
Measurement, is then to measure principal current I, vacuum switch branch current respectivelyI 1 And transfer resistance branch currentI sh ；
D. judge principal current whether through peak value；It is no, then it is considered as invalid and terminates measurement, it is then to control the separating brake of vacuum switch 1,
The 1.5ms starting impulses transverse magnetic field coil before principal current zero passage；
E. vacuum switch electric current is judgedI 1 Whether it is zero；It is no, then it is considered as invalid and terminates measurement, it is to calculateΔt 2 =t 2 -t e , t 2
It is the moment of principal current zero passage,t e It isI 1 For zero moment；
F. judgeΔt 2 Whether 20 μ s are more than；It is no, then it is considered as invalid and terminates measurement, be, after record principal current I zero passageI sh 's
Reverse current, the post-arc current of as tested chopper；
G. the post-arc current for being detected is uploaded to into master controller, post-arc current measurement terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611166827.5A CN106597271A (en) | 2016-12-16 | 2016-12-16 | Post arc current measurement method based on current transfer characteristics and magnetic blowout |
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| CN201611166827.5A CN106597271A (en) | 2016-12-16 | 2016-12-16 | Post arc current measurement method based on current transfer characteristics and magnetic blowout |
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| CN106597271A true CN106597271A (en) | 2017-04-26 |
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| CN201611166827.5A Pending CN106597271A (en) | 2016-12-16 | 2016-12-16 | Post arc current measurement method based on current transfer characteristics and magnetic blowout |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545617A (en) * | 2018-12-18 | 2019-03-29 | 中国电建集团河南省电力勘测设计院有限公司 | Vertical magnetic vacuum arc-chutes arc region remanent magnetism autocompensation installation |
| CN110133493A (en) * | 2019-06-03 | 2019-08-16 | 浙江零壹智能电器研究院有限公司 | Residual current test system after breaker arc |
| CN112180145A (en) * | 2020-09-29 | 2021-01-05 | 广东电网有限责任公司佛山供电局 | Post-arc field emission current measurement compensation system for arc extinguish chamber |
| CN116908675A (en) * | 2023-09-08 | 2023-10-20 | 清华四川能源互联网研究院 | Circuit breaker post-arc current measurement system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112180145A (en) * | 2020-09-29 | 2021-01-05 | 广东电网有限责任公司佛山供电局 | Post-arc field emission current measurement compensation system for arc extinguish chamber |
| CN112180145B (en) * | 2020-09-29 | 2021-05-28 | 广东电网有限责任公司佛山供电局 | Post-arc field emission current measurement compensation system for arc extinguish chamber |
| CN116908675A (en) * | 2023-09-08 | 2023-10-20 | 清华四川能源互联网研究院 | Circuit breaker post-arc current measurement system and method |
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