CN106771485A - Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out - Google Patents
Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out Download PDFInfo
- Publication number
- CN106771485A CN106771485A CN201611168106.8A CN201611168106A CN106771485A CN 106771485 A CN106771485 A CN 106771485A CN 201611168106 A CN201611168106 A CN 201611168106A CN 106771485 A CN106771485 A CN 106771485A
- Authority
- CN
- China
- Prior art keywords
- current
- vacuum switch
- transfer resistance
- vacuum
- transfer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention discloses a kind of without ground interference,The high-precision post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out,It is provided with vacuum switch,Primary current sense device is in series with the end of incoming cables of vacuum switch or leading-out terminal,The vacuum switch current sensor connected with contacts of vacuum switch is connected between the end of incoming cables of vacuum switch and leading-out terminal,The transfer resistance and transfer resistance current sensor for being parallel with portable protective gaps with the contacts of vacuum switch and vacuum switch current sensor being in series and being in series,Pulse transverse magnetic field coil is fixed with vacuum extinction room,Primary current sense device,The output of vacuum switch current sensor and transfer resistance current sensor connects with master controller,Tested circuit-breaker status detection unit is also connected to the input of master controller,The output of the master controller connects with vacuum switch drive mechanism and pulse transverse magnetic field coil control unit.
Description
Technical field
The invention belongs to mesohigh breaker post-arc current fields of measurement, more particularly to one kind disturbed without ground, it is high-precision
Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out.
Background technology
The then construction and the increase of net capacity of country's intelligent grid, to the protection switch-high pressure of high-voltage intelligent power network
Breaker proposes requirement higher.Breaker 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 breaker,
It is the Important Parameters of breaker 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 are opened
Begin to be shifted from mechanical switch to coaxial shunt, and be completely transferred on coaxial shunt before current over-zero, and then by coaxial
Post-arc current after current divider measurement principal current zero passage.Control of this kind of method to the thermal capacity and mechanical switch of coaxial shunt
Required precision is high, and signal is weaker and disturbs with having.Also a kind of measuring method is straight using current divider or special Rogowski coil
Measurement is connect, but because principal current is too big with the difference in size of post-arc current（Principal current is general in tens kilo-amperes, and post-arc current one
As 1 ~ 2 peace）, the current measure device such as current divider or special Rogowski coil is difficult to bear high current again can be small with accurate measurement
Electric current, certainty of measurement is low, and the presence that high impedance, low heat capacity current divider are disturbed with also having, and special Rogowski coil by
Then integrated signal and accurate absolute time signal cannot be obtained and design is 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
The post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out.
Technical solution of the invention is：A kind of post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out,
Vacuum switch is provided with, primary current sense device is in series with the end of incoming cables of vacuum switch or leading-out terminal, in the end of incoming cables of vacuum switch
The vacuum switch current sensor connected with contacts of vacuum switch is connected between leading-out terminal, with the contacts of vacuum switch being in series
And vacuum switch current sensor is parallel with portable protective gaps and the transfer resistance and transfer resistance current sensor that are in series, true
The pulse transverse magnetic field coil of relative vacuum switch contact, the primary current sense are fixed with the vacuum extinction room that air switch is closed
The output of device, vacuum switch current sensor and transfer resistance current sensor connects with master controller, with master controller
Input is also connected to tested circuit-breaker status detection unit, output and vacuum switch drive mechanism and the arteries and veins of the master controller
Transverse magnetic field coil control unit is rushed to connect.
The pulse transverse magnetic field coil is nurse suddenly hertz coil, and produced pulse transverse magnetic field pulsewidth is 3ms, magnetic field
Intensity is 0 ~ 300mT.
The transfer resistance is linear constantan-made resistances, the resistance of transfer resistance, the protection of portable protective gaps
Voltage, in formula：sIt is the sectional area of transfer resistance,；lIt is transfer resistance
Length,I m It is main current peak,Δt 2 Extinguish the time to principal current zero passage completely for Vacuum switching arc,mIt is transfer resistance
Quality,ΔTIt is the highest operating temperature rise of transfer resistance material therefor,kIt is the resistivity of transfer resistance material therefor,γIt is health
The specific heat capacity of copper 6J20.
The present invention is auxiliary with magnetic field arc blow-out based on current transfer characteristic, realizes measuring loop with major loop
Isolation measurement, can be prevented effectively from ground interference signal；The present invention is acted on by shifting branch resistance parameter designing and magnetic blow-out simultaneously, can
Effectively control the electric current of 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；With certainty of measurement is high, interference is few, high reliability.In addition, by Fiber isolation control
And data communication, the on-line measurement of power system post-arc current can be met.
Brief 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 in series with the end of incoming cables 2 of vacuum switch 1 or contact leading-out terminal 3
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 and transfer resistance that are in series
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 8 is preferably linear constantan-made resistances, its resistance, the guarantor of portable protective gaps 7
Shield voltage set value, in formula：sIt is the sectional area of transfer resistance 5,；l
It is the length of transfer resistance 8,I m It is main current peak,Δt 2 Extinguish the time to principal current zero passage completely for Vacuum switching arc,mIt is the quality of transfer resistance 8,ΔTIt is the highest operating temperature rise of the material therefor 6J20 of transfer resistance 8,kUsed by transfer resistance 8
The resistivity of material 6J20,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 h high 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 mounting hole set 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, the input with master controller 12 also connects
There are tested circuit-breaker status detection 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 detection unit 13 is by the distance between tested contact of breaker of monitoring
Judge that whether tested breaker 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 circuit such as storage capacitor and IGCT to the unit of field coil.
The measuring method flow of embodiment of the present invention master controller is as shown in Figure 4：
Primary current sense device 4 is connected in the breaker such as high-pressure vacuum breaker or SF6 breakers loop.
Tested breaker is controlled to cut-off before principal current zero passage（This order can be assigned by main control, also can be by craft
Control or the control of other control devices）；The state of tested breaker is monitored by being tested circuit-breaker status detection unit 13；According to institute
Whether the tested breaker of the condition adjudgement of the tested breaker 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 by 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, produce pulse horizontal in vacuum interrupter 10
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 It is zero moment；JudgeΔt 2 It is no whether more than 20 μ s, then be considered as it is invalid and
Terminate measurement, be, after record principal current I zero passagesI sh Reverse current, as be tested breaker post-arc current, then 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 after to 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,TRVFor test product breaker is opened
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 is general, and in milliohm level, contact resistance is general 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, in additional transverse direction
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 to principal current I zero passages completely, 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 after the arc of vacuum switch, in order to subtract
The influence of vacuum switch stray capacitance parameter is, it is necessary to control in small post-arc current measurement apparatusΔt 2 Stage is far longer than 20 μ s.
Self-supplying power source design can be carried out by 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, for the repair based on condition of component of power system provides reliable data.
Claims (3)
1. a kind of post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out, it is characterised in that：It 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）'s
End of incoming cables（2）With leading-out terminal（3）Between be connected to and contacts of vacuum switch（5）The vacuum switch current sensor of series connection（6）, with phase
The contacts of vacuum switch of series connection（5）And vacuum switch current sensor（6）It is parallel with portable protective gaps（7）And the transfer electricity being in series
Resistance（8）With transfer resistance current sensor（9）, in vacuum switch（1）Vacuum interrupter（10）Relative vacuum is inside fixed with to open
Close contact（5）Pulse transverse magnetic field coil（11）, the primary current sense device（4）, vacuum switch current sensor（6）And turn
Move resistive current sensor（9）Output and master controller（12）Connect, with master controller（12）Input be also connected to
Tested circuit-breaker status detection unit（13）, the master controller（12）Output and vacuum switch drive mechanism（14）And pulse
Transverse magnetic field coil control unit（15）Connect.
2. post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out according to claim 1, it is characterised in that：
The pulse transverse magnetic field coil（11）It is nurse suddenly hertz coil, produced pulse transverse magnetic field pulsewidth is 3ms, magnetic field intensity
It is 0 ~ 300mT.
3. the post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out according to claim 1 and 2, its feature
It is：The transfer resistance（8）It is linear constantan-made resistances, transfer resistance（8）Resistance, portable protective gaps（7）
Protection voltage, in formula：sIt is transfer resistance（5）Sectional area,；l
It is transfer resistance（8）Length,I m It is main current peak,Δt 2 Extinguish completely for Vacuum switching arc to principal current zero passage when
Between,mIt is transfer resistance（8）Quality,ΔTIt is transfer resistance（8）The highest operating temperature rise of material therefor,kIt is transfer resistance（8）
The resistivity of material therefor,γIt is the specific heat capacity of constantan 6J20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611168106.8A CN106771485A (en) | 2016-12-16 | 2016-12-16 | Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611168106.8A CN106771485A (en) | 2016-12-16 | 2016-12-16 | Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106771485A true CN106771485A (en) | 2017-05-31 |
Family
ID=58892165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611168106.8A Pending CN106771485A (en) | 2016-12-16 | 2016-12-16 | Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106771485A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104340A (en) * | 1985-06-05 | 1986-12-03 | 西安高压电器研究所 | The bridge-type measuring of circuit of current after arc in area of null current |
| CN85104487A (en) * | 1985-06-10 | 1987-03-11 | 西安高压电器研究所 | Limit the testing method of isolating switch arc time |
| CN2105690U (en) * | 1991-08-05 | 1992-05-27 | 西安交通大学 | Wideband pulse current measurer |
| JP2000510679A (en) * | 1997-03-26 | 2000-08-15 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for selective network monitoring in switchgear |
| CN103824736A (en) * | 2014-03-02 | 2014-05-28 | 西安交通大学 | Direct current breaker with magnetic quenching device |
-
2016
- 2016-12-16 CN CN201611168106.8A patent/CN106771485A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104340A (en) * | 1985-06-05 | 1986-12-03 | 西安高压电器研究所 | The bridge-type measuring of circuit of current after arc in area of null current |
| CN85104487A (en) * | 1985-06-10 | 1987-03-11 | 西安高压电器研究所 | Limit the testing method of isolating switch arc time |
| CN2105690U (en) * | 1991-08-05 | 1992-05-27 | 西安交通大学 | Wideband pulse current measurer |
| JP2000510679A (en) * | 1997-03-26 | 2000-08-15 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for selective network monitoring in switchgear |
| CN103824736A (en) * | 2014-03-02 | 2014-05-28 | 西安交通大学 | Direct current breaker with magnetic quenching device |
Non-Patent Citations (2)
| Title |
|---|
| 葛国伟等: "双断口真空断路器配合特性仿真与试验", 《电工技术学报》 * |
| 葛国伟等: "基于电流转移的断路器弧后电流测量方法", 《高电压技术》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11879927B2 (en) | Triggered vacuum gap fault detection methods and devices | |
| CN106597271A (en) | Post arc current measurement method based on current transfer characteristics and magnetic blowout | |
| CA2596192C (en) | Method and apparatus for determining a switching time for an electrical switching device | |
| CN103490403B (en) | For discharging the method and system of the energy from electric fault | |
| Ghafourian et al. | General analysis of vacuum circuit breaker switching overvoltages in offshore wind farms | |
| CN203732254U (en) | Circuit breaker mechanical characteristic online monitoring device | |
| CN103744018A (en) | On-line monitoring system aiming at high-voltage circuit breaker | |
| CN108226771A (en) | Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring method | |
| CN103823179A (en) | Non-contact spatial high-frequency high-voltage circuit breaker operation characteristics measurement method | |
| CN110346688A (en) | A kind of high pressure complexity cable fault quick segmentation differentiates and localization method | |
| Kong et al. | High-voltage circuit-breaker insulation fault diagnosis in synthetic test based on noninvasive switching electric-field pulses measurement | |
| CN107607847A (en) | 110kV high-tension cable detection methods based on polarization depolarization current method | |
| US11508539B2 (en) | Voltage readings using high voltage resistor across vacuum interrupter | |
| CN102879710B (en) | System and method for detecting single-phase ground fault point of power distribution line | |
| CN207440180U (en) | A kind of high-voltage circuitbreaker comprehensive tester | |
| CN102800523A (en) | Solid-sealed polar pole realizing on-line monitoring of vacuum degree | |
| CN106771485A (en) | Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out | |
| CN112670971B (en) | Single-phase earth fault comprehensive treatment system | |
| KR101854212B1 (en) | Method and system for testing a switching installation for power transmission installations | |
| CN103560047A (en) | Vacuum arc-extinguishing chamber vacuum degree on-line detecting device | |
| WO2022125256A1 (en) | Method for fast-detection of peak fault current | |
| CN108320988B (en) | 10kV pole-mounted circuit breaker | |
| Zhang et al. | Interrupting characteristics of a DC combined apparatus for rail transit systems | |
| CN209881407U (en) | Differential amplifying line selection and arc light management device | |
| CA2467106A1 (en) | Method for dectection of a ground fault, which occurs in the vicinity of a neutral point in an electrical device, as well as an apparatus for carrying out the method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170531 |
|
| RJ01 | Rejection of invention patent application after publication |