CN107179500B - Method for measuring switching-on and switching-off time when two ends of circuit breaker are grounded based on orthogonal pulse - Google Patents
Method for measuring switching-on and switching-off time when two ends of circuit breaker are grounded based on orthogonal pulse Download PDFInfo
- Publication number
- CN107179500B CN107179500B CN201710464264.6A CN201710464264A CN107179500B CN 107179500 B CN107179500 B CN 107179500B CN 201710464264 A CN201710464264 A CN 201710464264A CN 107179500 B CN107179500 B CN 107179500B
- Authority
- CN
- China
- Prior art keywords
- pulse
- circuit breaker
- pulses
- positive
- opening
- 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.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000002707 nanocrystalline material Substances 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims 2
- 229910045601 alloy Inorganic materials 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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)
- Breakers (AREA)
- Magnetic Treatment Devices (AREA)
Abstract
The method for measuring the opening and closing time of the circuit breaker based on orthogonal pulses when two ends of the circuit breaker are grounded is characterized in that the opening and closing time of the circuit breaker is obtained by the number of pulses flowing through a pulse counter during the opening and closing period. When the circuit breaker is opened, opening coil drive signal gives the moment, and positive and negative pulse generator begins output pulse, and pulse counter starts the count, and after the circuit breaker contact disconnection, pulse counter can not receive positive and negative pulse and stops counting, then the time of opening: t is t(fen he)For the number n of pulses multiplied by a single pulse period tp，t(fen he)＝tpX n. By adopting the magnetic shielding method, the measuring signals adopt orthogonal positive and negative polarity pulses, the opening and closing time of the circuit breaker is obtained by the number of pulses flowing through the counter during the opening and closing, and the defect that the voltage conversion moment is misread due to the fact that direct-current voltage is easy to be interfered by the outside is avoided.
Description
Technical Field
The invention discloses a method for measuring opening and closing time when two ends of a circuit breaker are grounded based on orthogonal pulses, and relates to the field of measurement of opening and closing time of the circuit breaker.
Background
The measurement of the opening and closing time of the circuit breaker is generally carried out by monitoring the change of fracture voltage along with the opening and closing state. When the circuit breaker is grounded at both ends, for example: when the grounding knife switches on two sides of the circuit breaker are prevented from being subjected to induced electricity or circuit reverse transmission to forbid breaking, due to the bypass effect of the earth, the fracture levels of the grounding knife switches are clamped at zero potential, and the opening and closing states of the circuit breaker cannot be reflected, so that the measurement cannot be carried out.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for measuring the opening and closing time when two ends of a circuit breaker are grounded based on orthogonal pulses. On one hand, the precaution capacity of the measuring device for external electromagnetic interference is improved; on the other hand, the adopted pulse signal can be shielded by a magnetic core with high non-saturated inductance, so that the pulse signal can be normally used when two ends of a fracture of the circuit breaker are grounded.
The technical scheme adopted by the invention is as follows:
the method for measuring the opening and closing time of the circuit breaker based on orthogonal pulses when two ends of the circuit breaker are grounded comprises the steps that the orthogonal positive and negative polarity pulses are adopted as measuring signals, and the opening and closing time of the circuit breaker is obtained by the number of pulses flowing through a pulse counter during the opening and closing period.
The method for measuring the opening and closing time of the circuit breaker based on orthogonal pulses when two ends of the circuit breaker are grounded is characterized in that the opening and closing time of the circuit breaker is obtained by the number of pulses flowing through a pulse counter during the opening and closing period.
When the circuit breaker is opened, opening coil drive signal gives the moment, and positive and negative pulse generator begins output pulse, and pulse counter starts the count, and after the circuit breaker contact disconnection, pulse counter can not receive positive and negative pulse and stops counting, then the time of opening: t is t(fen he)For the number n of pulses multiplied by a single pulse period tp，t(fen he)＝tp×n；
The measurement of closing time is similar with the separating brake, when the two ends of the circuit breaker are grounded, the two ends of the circuit breaker pass through a loop formed by a grounding wire and the ground, a shielding magnetic core made of an iron-based nanocrystalline material is sleeved on the loop of the ground, the effect of the shielding magnetic core in the circuit is equivalent to a large inductance, the positive and negative pulses are blocked from passing through, and the pulse counter can normally receive pulse signals.
The invention discloses a method for measuring switching-on and switching-off time when two ends of a circuit breaker are grounded based on orthogonal pulses, which has the advantages that:
1: the measuring signal adopts orthogonal positive and negative polarity pulses, the opening and closing time of the circuit breaker is obtained by the number of pulses flowing through the counter during the opening and closing period, and the defect that the voltage conversion moment is misread due to the fact that direct-current voltage is easy to be interfered by the outside is avoided.
2: use shielding magnetic core separation ground return circuit, it is convenient to install, safe in utilization.
3: the pulse width of the orthogonal pulse can be manually adjusted, so that waveform fluctuation caused by load change is avoided, and the measurement stability is improved.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
FIG. 2 is a diagram of the waveforms of the orthogonal pulses of the present invention.
Fig. 3 is a schematic diagram of the structure of the shielding magnetic core according to the present invention.
Fig. 4 is a simulation diagram of the magnetic induction intensity on the magnetic ring when the pulse amplitude is maximum.
Fig. 5 is a schematic diagram of manually adjusting the series inductance of the measurement loop.
Detailed Description
According to the method for measuring the opening and closing time when two ends of the circuit breaker are grounded based on orthogonal pulses, as shown in fig. 1, the opening and closing time of the circuit breaker 1 is obtained by the number of pulses flowing through a pulse counter 2 during the opening and closing period. When the circuit breaker 1 is opened, the opening coil driving signal gives the moment, the positive and negative pulse generator 4 starts to output pulses, the pulse counter 2 starts counting, and when the circuit breaker 1 contacts are disconnected, the pulse counter 2 cannot receive the positive and negative pulses to stop counting, so the opening time is as follows: t is t(fen he)For the number n of pulses multiplied by a single pulse period tp，t(fen he)＝tp×n。
The measurement of the closing time is similar to the opening, when the two ends of the circuit breaker 1 are grounded, as shown in fig. 1, a is a loop formed by the two ends of the circuit breaker 1 and the ground through a grounding wire, a shielding magnetic core 3 made of an iron-based nanocrystalline material is selected to be sleeved on the ground loop, the shielding magnetic core 3 acts as a large inductor in the circuit, the positive and negative pulses are prevented from passing through, and the pulse counter 2 can normally receive pulse signals.
The working principle is as follows:
when the magnetic core inductance is not extracted from the grounding loop, the positive and negative pulses are shunted according to the impedance ratio of the ground loop and the wiring loop of the measuring device, so that the time constant of the whole measuring loop is changed, the pulse amplitude obtained on the positive and negative pulse generator 4 is reduced, and the measuring device cannot obtain a correct result. After the magnetic core inductance is extracted, positive and negative pulses flowing through the grounding loop are blocked by the magnetic core inductance, so that the positive and negative pulses can only flow through the loop of the pulse counter 2.
The blocking effect of the shielding core 3 for positive and negative pulses is mainly influenced by two parameters: one is the unsaturated inductance of the magnetic core, and the higher the unsaturated inductance is, the larger the magnetic core inductive reactance is; the second is equivalent pulse frequency, and the higher the pulse frequency is, the larger the magnetic core inductive reactance is. The unsaturated inductance of the shielding magnetic core 3 is determined by the pulse magnetization characteristics of the structure and material of the shielding magnetic core 3, and the equivalent inductance L0 is made to be much larger than the stray inductance of the measuring loop as much as possible.
The choice of the equivalent pulse frequency is limited by two factors: the upper limit of the frequency is the minimum pulse rising edge and the pulse width which can be identified by the pulse counter 2; the lower limit of the frequency is the minimum precision of the opening and closing time required by the measurement standard. According to the relevant metric criteria, the individual pulse shape is determined as follows: the peak value is 20V, 10% -90% rising edge time is 1 mus, falling edge time is 4 mus, pulse waveform parameters of positive and negative polarities are identical, and the interval time t between the two is2: i.e. a duty cycle of 50%, a single pulse period tpAt 10 mus, the minimum resolution of the measured opening and closing time is 10 mus, and the waveform is shown in fig. 2.
The positive and negative pulse amplitudes are mirror symmetric and have zero time integral in two pulse periods. Therefore, the maximum volt-second product applied to the shielding magnetic core 3 in the work does not exceed the volt-second product of one pulse, which is beneficial to avoiding magnetic flux saturation and reducing the volume of the magnetic core. According to the orthogonal pulse waveform parameters, the stray impedance of the circuit breaker loop and the matching requirements of the working environment, the unsaturated inductance value of the shielding magnetic core 3 is determined to be 22 muH. The magnetic induction intensity on the designed shielding magnetic core 3 is simulated under the working condition, as shown in fig. 4. The magnetic induction intensity maximum is concentrated on the inner wall of the shielding magnetic core 3, and has the value: 0.17T, saturation induction with magnetic core: and a larger margin is reserved in comparison with 1.4T, so that the phenomenon of local saturation of the outgoing line of the magnetic core is avoided.
In addition, the stray impedance of the circuit breaker loop required to be measured on site has a wide value with different types of circuit breakers. In order to avoid the influence on the pulse waveform parameters, a relatively large inductor L1 needs to be connected in series in the output loop of the positive and negative pulse generator 4 to shield the change of the stray parameters. However, the inductance value of the series connection is not suitable to be too large, the larger the series inductance is, the smaller the shielding effect of the magnetic core on the ground loop is, and according to the circuit simulation result, the value of the series inductance is determined to be not more than one tenth of the equivalent inductance L0 of the shielding magnetic core 3. In summary, it is determined that the unsaturated inductance of the magnetic core is 22 μ H, the series inductance is designed to be an adjustable inductance, and the principle is shown in fig. 4 as the measured stray parameters of the circuit breaker loop are adjusted, so that the inductance of the whole measuring loop is fixed at 2 μ H.
Claims (1)
1. The method for measuring the switching-on and switching-off time when two ends of the circuit breaker are grounded based on orthogonal pulses is characterized in that: the measuring signal adopts orthogonal positive and negative polarity pulses, and the opening and closing time of the circuit breaker (1) is obtained by the number of pulses flowing through the pulse counter (2) during the opening and closing period;
when circuit breaker (1) separating brake, separating brake coil drive signal gives the moment, and positive and negative pulse generator (4) begin output pulse, and pulse counter (2) start-up count, and after circuit breaker (1) contact disconnection, pulse counter (2) can not receive positive and negative pulse and stop counting, then the separating brake time: t is t(minute)For the number n of pulses multiplied by a single pulse period tp，t(minute)＝tp×n；
The measurement of the closing time is similar to opening,
when circuit breaker (1) is closed a floodgate, switching-off coil drive signal gives the moment, and positive and negative pulse generator (4) begin output pulse, and pulse counter (2) start-up count, and after circuit breaker (1) contact was closed, pulse counter (2) normally received positive and negative pulse and began to count, then switching-off time: t is t(alloy)For the number n of pulses multiplied by a single pulse period tp，t(alloy)＝tp×n；
When the two ends of the circuit breaker (1) are grounded, the two ends of the circuit breaker (1) form a loop with the ground through a grounding wire, a shielding magnetic core (3) made of an iron-based nanocrystalline material is sleeved on the loop of the ground, and the shielding magnetic core (3) acts as a large inductor in the circuit, so that positive and negative pulses are blocked from passing through, and the pulse counter (2) can normally receive pulse signals;
the positive and negative pulse amplitudes are in mirror symmetry and have zero time integral in two pulse periods;
after the magnetic core inductance is extracted, positive and negative pulses flowing through the grounding loop are blocked by the magnetic core inductance, so that the positive and negative pulses can only flow through the loop of the pulse counter (2).
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107179500A CN107179500A (en) | 2017-09-19 |
| CN107179500B true CN107179500B (en) | 2020-06-02 |
Family
ID=59835408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107179500B (en) |
Families Citing this family (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 |
| CN114062913B (en) * | 2021-11-04 | 2023-07-07 | 国网安徽省电力有限公司超高压分公司 | Detection device and method for opening and closing time points of double-end grounding circuit breaker |
| CN114217220B (en) * | 2022-02-23 | 2022-05-17 | 深圳市德兰明海科技有限公司 | Switch detection circuit and method and switch detector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102259948A (en) * | 2011-05-20 | 2011-11-30 | 上海理工大学 | Novel blue green algae treatment device |
| CN102435942A (en) * | 2011-09-06 | 2012-05-02 | 武汉义天科技有限公司 | Electromagnetic induction system of high-tension switch fracture and test method thereof |
| CN102590739A (en) * | 2012-02-18 | 2012-07-18 | 山西省电力公司晋城供电分公司 | On-line detecting device and detecting method for switch-on and switch-off period of power switch cabinet circuit breaker |
| CN206557343U (en) * | 2017-02-28 | 2017-10-13 | 国家电网公司 | A kind of device that the circuit-breaker switching on-off time is measured based on orthogonal pulses |
-
2017
- 2017-06-19 CN CN201710464264.6A patent/CN107179500B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102259948A (en) * | 2011-05-20 | 2011-11-30 | 上海理工大学 | Novel blue green algae treatment device |
| CN102435942A (en) * | 2011-09-06 | 2012-05-02 | 武汉义天科技有限公司 | Electromagnetic induction system of high-tension switch fracture and test method thereof |
| CN102590739A (en) * | 2012-02-18 | 2012-07-18 | 山西省电力公司晋城供电分公司 | On-line detecting device and detecting method for switch-on and switch-off period of power switch cabinet circuit breaker |
| CN206557343U (en) * | 2017-02-28 | 2017-10-13 | 国家电网公司 | A kind of device that the circuit-breaker switching on-off time is measured based on orthogonal pulses |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107179500A (en) | 2017-09-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107179500B (en) | Method for measuring switching-on and switching-off time when two ends of circuit breaker are grounded based on orthogonal pulse | |
| CN106463253B (en) | For improving the switch controller with verifying circuit of noise immunity | |
| CN104931758A (en) | Direct-current residual current detection apparatus | |
| CN104300494B (en) | The consistent A type earth leakage protective devices of drop-away current value of leaking electricity | |
| CN102510210A (en) | Multifunctional anti-electromagnetic interference (EMI) filter | |
| CN109360708B (en) | Three-phase full-wave rectification ultralow frequency demagnetizer | |
| CN204188673U (en) | A kind of Ground Network of Transmission Line with Renovation detects dedicated power supply apparatus | |
| CN102411135A (en) | Device and method for testing electrical fast transient/burst (EFT/B) immunity of electric energy meter | |
| US20210318359A1 (en) | Electric circuit arrangement and a method for a galvanically insulated, ac/dc sensitive differential-current measurement having high resolution | |
| Shimizu et al. | Loss evaluation of AC filter inductor core on a PWM converter | |
| EP4049051B1 (en) | Fluxgate current transducer | |
| JPH08122387A (en) | Method and apparatus for testing polarity of current transformer | |
| CN104155507A (en) | Leakage current detection circuit and method | |
| CN202759376U (en) | Novel RCD absorbing circuit | |
| GB666574A (en) | Improvements in the use of saturable magnetic chokes as discharge devices | |
| CN104410081B (en) | Based on the high pressure TSC driving means that efficient coupling takes energy | |
| CN204044236U (en) | A kind of leakage current detection circuit | |
| CN102554440B (en) | For moving the method and apparatus of electric resistance welder | |
| CN203423618U (en) | Power supply having function of absorbing micro pulse waves | |
| WO2012055914A1 (en) | Inductive proximity sensor | |
| CN114724798A (en) | Alternating-current zero-crossing magnetic core demagnetization and demagnetization circuit and method | |
| Wu et al. | Bipolar Marx circuit based on double transformers | |
| CN203054206U (en) | Pulse magnetization curve measurement circuit | |
| DE102010043010C5 (en) | Inductive proximity switch | |
| SU660139A2 (en) | Arrangement for detecting the mode of connection of transformer or short-circuiting in primary circuit by current second harmonic |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200602 Termination date: 20210619 |