CN107179500A - The method that branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses - Google Patents
The method that branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses Download PDFInfo
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- CN107179500A CN107179500A CN201710464264.6A CN201710464264A CN107179500A CN 107179500 A CN107179500 A CN 107179500A CN 201710464264 A CN201710464264 A CN 201710464264A CN 107179500 A CN107179500 A CN 107179500A
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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
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Abstract
The method that branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses, the branch wire time of breaker is drawn by the pulse number that pulse counter is flowed through during divide-shut brake.During breaker open operation, switching winding drive signal provides the moment, and positive negative pulse stuffing generator starts to export pulse, and pulse counter, which starts, to be counted, after contact of breaker disconnects, and pulse counter does not receive positive negative pulse stuffing and stops counting, then opening time：t(divide, close)Individual pulse cycle t is multiplied by for pulse number np, t(divide, close)=tp×n.Using magnetic screen method of the present invention, measurement signal uses orthogonal positive-negative polarity pulse, the branch wire time of breaker is drawn by the pulse number that counter is flowed through during divide-shut brake, it is to avoid the defect for easily being caused to misread voltage changing moment by external disturbance using DC voltage.
Description
Technical field
The method for measuring branch wire time during a kind of breaker two-terminal-grounding based on orthogonal pulses of the present invention, is related to open circuit
Device branch wire time fields of measurement.
Background technology
The measurement of circuit-breaker switching on-off time is general to be carried out using monitoring fracture voltage with the change of opening and closing state.
In breaker two-terminal-grounding, for example：The grounding switch of breaker both sides is due to preventing induced electricity or preventing the anti-power transmission of circuit from prohibiting
Only during disjunction, because the bypass of the earth is acted on, its fracture level is clamped at zero potential, it is impossible to reflect the divide-shut brake of breaker
State and lead to not measurement.
The content of the invention
In order to solve the above technical problems, measurement point when the present invention provides a kind of breaker two-terminal-grounding based on orthogonal pulses
The method of closing time, this method replaces traditional DC measurement voltage using the alternate orthogonal pulses of positive-negative polarity, changes
The method of fracture voltage variable condition was monitored in the past, but flowed through the pulse number in breaker loop to obtain division by calculating
The lock time.This aspect improves prevention ability of the measurement apparatus to external electromagnetic interference；On the other hand due to the pulse of use
Signal can be shielded with the magnetic core of high unsaturation inductance, therefore can also be normally in breaker fracture two-terminal-grounding
Use.
The technical scheme that the present invention takes is：
The method that branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses, measurement signal is using orthogonal
Positive-negative polarity pulse, the branch wire time of breaker is drawn by the pulse number that pulse counter is flowed through during divide-shut brake.
The method that branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses, the branch wire time of breaker
Drawn by the pulse number that pulse counter is flowed through during divide-shut brake.
During breaker open operation, switching winding drive signal provides the moment, and positive negative pulse stuffing generator starts to export pulse, pulse
Counter, which starts, to be counted, after contact of breaker disconnects, and pulse counter does not receive positive negative pulse stuffing and stops counting, then during separating brake
Between：t(divide, close)Individual pulse cycle t is multiplied by for pulse number np, t(divide, close)=tp×n；
The measurement of closing time is similar with separating brake, when breaker two-terminal-grounding, and breaker two ends are by ground wire and greatly
The loop of ground formation, extracts a shielding magnetic core made by iron based nano crystal material, shielding magnetic core is in electricity in ground return circuit
One big inductance is functioned as in road, positive negative pulse stuffing is hindered and passes through, pulse counter is normally received pulse signal.
The method for measuring branch wire time during a kind of breaker two-terminal-grounding based on orthogonal pulses of the present invention, advantage exists
In：
1：Measurement signal uses orthogonal positive-negative polarity pulse, and the branch wire time of breaker is by flowing through meter during divide-shut brake
The pulse number of number devices is drawn, it is to avoid the defect for easily being caused to misread voltage changing moment by external disturbance using DC voltage.
2：Using shielding magnetic core barrier earth-return circuit, it is convenient to install, and uses safety.
3：The pulsewidth of orthogonal pulses can be manually adjusted, it is to avoid waveform is fluctuated caused by loading change, make measurement stable
Property improve.
Brief description of the drawings
Fig. 1 is theory diagram of the invention.
Fig. 2 is orthogonal pulses oscillogram of the invention.
Fig. 3 is shielding core structure schematic diagram of the invention.
Magnetic induction intensity analogous diagram when Fig. 4 is maximum for the pulse amplitude of the present invention on magnet ring.
Fig. 5 is to manually adjust measuring loop series inductance schematic diagram.
Embodiment
According to Fig. 1, the method that branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses, breaker
1 branch wire time is drawn by the pulse number that pulse counter 2 is flowed through during divide-shut brake.During 1 separating brake of breaker, switching winding
Drive signal provides the moment, and positive negative pulse stuffing generator 4 starts to export pulse, and pulse counter 2, which starts, to be counted, when breaker 1 is touched
After head disconnects, pulse counter 2 does not receive positive negative pulse stuffing and stops counting, then opening time：t(divide, close)It is multiplied by for pulse number n
Individual pulse cycle tp, t(divide, close)=tp×n。
The measurement of closing time is similar with separating brake, when 1 two-terminal-grounding of breaker, in such as Fig. 1, is breaker 1 shown in A
The loop that two ends are formed by ground wire with the earth, selects to extract here one in ground return circuit by iron based nano crystal material system
The shielding magnetic core 3 of work, shielding magnetic core 3 in circuit function as one big inductance, hinder positive negative pulse stuffing and pass through, make arteries and veins
Pulse signal can be normally received by rushing counter 2.
Operation principle：
When earth-return circuit does not extract core inductance, positive negative pulse stuffing is according to ground return circuit and measurement apparatus connection circuit
Impedance ratio is shunted, and is changed the time constant of whole measuring loop and is reduced the pulse that is obtained on positive negative pulse stuffing generator 4
Amplitude, prevents measurement apparatus from obtaining correct result.Extract after core inductance, flow through the positive negative pulse stuffing of earth-return circuit by magnetic core
Inductance is obstructed so that positive negative pulse stuffing is merely able to flow through the loop of pulse counter 2.
Shielding magnetic core 3 is mainly influenceed for the obstruction effect of positive negative pulse stuffing by two parameters：One is magnetic core is non-
Pulsactor, unsaturation inductance is higher, and magnetic core induction reactance is bigger；Secondly being equivalent pulse frequency, pulse frequency is higher, magnetic core induction reactance
It is bigger.Shielding magnetic core 3 unsaturation inductance determined by the structure and material impulse magnetization characteristic of shielding magnetic core 3, will also be as far as possible
Equivalent inductance L0 is set to be much larger than the stray inductance of measuring loop.
The selection of equivalent pulse frequency is limited by two factors：The minimum that upper frequency limit can recognize for pulse counter 2
Rising edge of a pulse and pulsewidth；Lower-frequency limit is the minimum precision of branch wire time required by measurement standard.Marked according to correlation metering
Standard, determines that individual pulse waveform is as follows：Peak value 20V, 10%-90% rising time are 1 μ s, and the trailing edge time is 4 μ s, positive and negative
The impulse waveform parameter of polarity is identical, both interval time t2：I.e. dutycycle is 50%, individual pulse cycle tpFor 10 μ s, then institute
The branch wire time minimum resolution of measurement is 10 μ s, and its waveform is as shown in Figure 2.
Positive-negative polarity pulse amplitude specular, is zero to time integral within two pulse periods.Therefore add in working
Voltagesecond product of the maximum voltagesecond product no more than a pulse on shielding magnetic core 3, is conducive to avoiding magnetic flux saturation, reduces magnetic core
Volume.According to the matching demand of orthogonal pulses waveform parameter, the impedance of breaker loop stray and working environment, it is determined that shielding magnetic
The unsaturation inductance value of core 3 is 22 μ H.The magnetic induction intensity on designed shielding magnetic core 3 is emulated under operating mode,
As shown in Figure 4.Magnetic induction intensity maximum concentrates on the inwall of shielding magnetic core 3, and its value is：0.17T, the saturation magnetic strength with magnetic core
Answer intensity：1.4T is compared to leaving larger nargin, it is to avoid magnetic core outlet local saturated phenomenon.
In addition, the breaker loop stray impedance of measurement needed for scene is with the difference of breaker model, value is extensive.For
Avoid its influence to impulse waveform parameter, it is necessary to connect in the output loop of positive negative pulse stuffing generator 4 one it is relatively large
Inductance L1, to shield the change of stray parameter.But the inductance value of this series connection is again unsuitable excessive, series inductance is bigger, magnetic core
It is smaller to the shield effectiveness of ground return circuit, according to Simulation results, determine that series inductance value is preferably not more than shielding magnetic core 3 etc.
Imitate 1/10th of inductance L0.In summary, the unsaturation inductance for determining magnetic core is 22 μ H, and series inductance is set using controllable impedance
Meter, as measured breaker loop stray parameter is adjusted, principle is as shown in Figure 4 so that the electricity of whole measuring loop
Inductance value is fixed on 2 μ H.
Claims (8)
1. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses, it is characterised in that：Measurement signal
Using orthogonal positive-negative polarity pulse, the branch wire time of breaker (1) is by flowing through the arteries and veins of pulse counter (2) during divide-shut brake
Number is rushed to draw.
2. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses, it is characterised in that：Based on orthogonal
The method that branch wire time is measured during the breaker two-terminal-grounding of pulse, it is characterised in that：The branch wire time of breaker (1) by
The pulse number that pulse counter (2) is flowed through during divide-shut brake is drawn；
During breaker (1) separating brake, switching winding drive signal provides the moment, and positive negative pulse stuffing generator (4) starts to export pulse, arteries and veins
Rush counter (2) and start counting, after breaker (1) contact disconnects, pulse counter (2) does not receive positive negative pulse stuffing and stops meter
Count, then opening time：t(divide, close)Individual pulse cycle t is multiplied by for pulse number np, t(divide, close)=tp×n；
The measurement of closing time is similar with separating brake, when breaker (1) two-terminal-grounding, breaker (1) two ends by ground wire with
The loop that the earth is formed, extracts a shielding magnetic core (3) made by iron based nano crystal material in ground return circuit, shields magnetic core
(3) in circuit function as one big inductance, hinder positive negative pulse stuffing and pass through, pulse counter (2) is normally connect
Receive pulse signal.
3. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses according to claim 2, its
It is characterised by：The selection of equivalent pulse frequency is limited by two factors：The minimum pulse that upper frequency limit can recognize for counter
Rising edge and pulsewidth；Lower-frequency limit is the minimum precision of branch wire time required by measurement standard；Determine individual pulse waveform such as
Under：Peak value 20V, 10%-90% rising time are 1 μ s, and the trailing edge time is 4 μ s, the impulse waveform parameter phase of positive-negative polarity
Together, both interval time t2, i.e. dutycycle：For 50%, individual pulse cycle tpFor 10 μ s, then measured branch wire time is most
Small resolution ratio is 10 μ s.
4. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses according to claim 2, its
It is characterised by：Positive-negative polarity pulse amplitude specular, is zero to time integral within two pulse periods.
5. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses according to claim 2, its
It is characterised by：It is added in voltagesecond product of the maximum voltagesecond product no more than a pulse on shielding magnetic core (3).
6. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses according to claim 2, its
It is characterised by：The unsaturation inductance value for shielding magnetic core (3) is 22 μ H.
7. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses according to claim 2, its
It is characterised by：Magnetic induction intensity maximum concentrates on the inwall of shielding magnetic core (3), and its value is：0.17T, with shielding magnetic core (3)
Saturation induction density：1.4T is compared, and leaves larger nargin, it is to avoid local saturated phenomenon occurs in shielding magnetic core (3).
8. the method for branch wire time is measured during breaker two-terminal-grounding based on orthogonal pulses according to claim 2, its
It is characterised by：In positive negative pulse stuffing generator (4) output loop, connect a relatively large inductance L1, to shield spuious ginseng
Several changes, series inductance L1 values are not more than 1/10th of shielding magnetic core (3) equivalent inductance L0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710464264.6A CN107179500B (en) | 2017-06-19 | 2017-06-19 | Method for measuring switching-on and switching-off time when two ends of circuit breaker are grounded based on orthogonal pulse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710464264.6A CN107179500B (en) | 2017-06-19 | 2017-06-19 | Method for measuring switching-on and switching-off time when two ends of circuit breaker are grounded based on orthogonal pulse |
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| CN107179500A true CN107179500A (en) | 2017-09-19 |
| CN107179500B CN107179500B (en) | 2020-06-02 |
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| CN201710464264.6A Expired - Fee Related CN107179500B (en) | 2017-06-19 | 2017-06-19 | Method for measuring switching-on and switching-off time when two ends of circuit breaker are grounded based on orthogonal pulse |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861058A (en) * | 2017-11-07 | 2018-03-30 | 山东泰开高压开关有限公司 | A kind of measurement apparatus and measuring method of vacuum circuit breaker divide-shut brake speed |
| CN108089120A (en) * | 2017-11-28 | 2018-05-29 | 中国能源建设集团华东电力试验研究院有限公司 | Improve rapid grounding plug-in strip branch wire time measuring accuracy analysis system |
| CN114062913A (en) * | 2021-11-04 | 2022-02-18 | 国网安徽省电力有限公司检修分公司 | Cylindrical spiral magnetic core, detection device and method |
| CN114217220A (en) * | 2022-02-23 | 2022-03-22 | 深圳市德兰明海科技有限公司 | Switch detection circuit and method and switch detector |
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| JPH05144352A (en) * | 1991-11-22 | 1993-06-11 | Toshiba Corp | Vacuum circuit-breaker |
| CN101261192A (en) * | 2008-04-24 | 2008-09-10 | 南京因泰莱配电自动化设备有限公司 | 24KV high-voltage vacuum breaker mechanical features on-line monitoring method and monitoring device |
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| JPH05144352A (en) * | 1991-11-22 | 1993-06-11 | Toshiba Corp | Vacuum circuit-breaker |
| CN101261192A (en) * | 2008-04-24 | 2008-09-10 | 南京因泰莱配电自动化设备有限公司 | 24KV high-voltage vacuum breaker mechanical features on-line monitoring method and monitoring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861058A (en) * | 2017-11-07 | 2018-03-30 | 山东泰开高压开关有限公司 | A kind of measurement apparatus and measuring method of vacuum circuit breaker divide-shut brake speed |
| CN108089120A (en) * | 2017-11-28 | 2018-05-29 | 中国能源建设集团华东电力试验研究院有限公司 | Improve rapid grounding plug-in strip branch wire time measuring accuracy analysis system |
| CN114062913A (en) * | 2021-11-04 | 2022-02-18 | 国网安徽省电力有限公司检修分公司 | Cylindrical spiral magnetic core, detection device and method |
| CN114217220A (en) * | 2022-02-23 | 2022-03-22 | 深圳市德兰明海科技有限公司 | Switch detection circuit and method and switch detector |
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