CN102435827A - Rogowski coil-based method and Rogowski coil-based device for detecting direct-current short-circuit current fault - Google Patents
Rogowski coil-based method and Rogowski coil-based device for detecting direct-current short-circuit current fault Download PDFInfo
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- CN102435827A CN102435827A CN2011102717087A CN201110271708A CN102435827A CN 102435827 A CN102435827 A CN 102435827A CN 2011102717087 A CN2011102717087 A CN 2011102717087A CN 201110271708 A CN201110271708 A CN 201110271708A CN 102435827 A CN102435827 A CN 102435827A
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Abstract
The invention relates to a Rogowski coil-based method and a Rogowski coil-based device for detecting a direct-current short-circuit current fault. The device comprises a Rogowski coil. A Rogowski coil measurement differential output signal is divided into two paths, wherein one path of the signal is communicated with a high-pass filtering unit, a first voltage comparison unit, a logic gate circuit and a circuit time delay unit in sequence; the other path of the signal is communicated with a low-pass filtering unit and a second voltage comparison unit in sequence; and a Rogowski coil measurement integration output signal is communicated with a third voltage comparison unit. The Rogowski coil-based method and the Rogowski coil-based device for detecting the direct-current short-circuit current fault are based on a protecting strategy of combining two criterions of a short-circuit current amplitude and a short-circuit current rate of rise, and under such a manner, the action reliability of a protecting device is improved, good electromagnetic compatibility can still be kept under the condition of stronger electromagnetic interference, the false tripping possibility of a tripper is reduced to a maximum degree, and simultaneously, the device can be ensured to still accurately and normally work under the condition of stronger electromagnetic interference. Simultaneously, the Rogowski coil-based method and the Rogowski coil-based device for detecting the direct-current short-circuit current fault are capable of well reducing the impact on a system under the short-circuit condition and relieving the load of a break.
Description
Technical field
The present invention relates to a kind of dc high-current measuring technology, belong to the electrical measuring instrument instrument.Be specifically related to a kind of method and device that detects based on Luo-coil direct-current short circuit current failure.
Background technology
Along with power system development, electric system just develops towards the direction of high capacity, high-voltage great-current in recent years.The harm of its short-circuit current is also more and more serious.This just has higher requirement to short circuit current protection.
Must be when failed because at the initial stage that short trouble takes place, promptly short-circuit current just can detect fault current and protect action between the rising stage, otherwise can produce harm greatly to system.Traditional current measuring method has been difficult to satisfy the demand of protective device, based on the current transformer of Luo-coil owing to the rate of change that can directly obtain short-circuit current receives increasing concern.Yet also there is not the easy method of a kind of maturation to realize quick protection based on the Luo-coil current transformer.
Summary of the invention
The object of the present invention is to provide and a kind ofly can improve detection speed; Fault detect is based on current-rising-rate and two kinds of protections of current amplitude incompatible realization that matches; Greatly degree has reduced the possibility of trip gear malfunction; Simultaneously can assurance device under condition than strong electromagnetic, still accurately the method and the device based on the detection of Luo-coil direct-current short circuit current failure of operate as normal.
For achieving the above object; The inventive system comprises: comprise the Rogowski coil, this Rogowski coil is measured differential output signal and is divided into two-way: the one tunnel is connected with high pass filter unit, first voltage comparison unit, logic gates and circuit delay unit successively;
Another road signal is connected with low-pass filter unit, second voltage comparison unit successively;
The Rogowski coil is measured integral output signal and is connected with the tertiary voltage comparing unit.
Described delay unit adopts the CMOS integrated counter.
Detection method of the present invention is following:
The Rogowski coil is measured differential output signal and is divided into two-way: one road signal at first passes through high pass filter unit; Signal after high-pass filtering is compared with the first voltage setting valve through first voltage comparison unit; If surpass the voltage setting valve; Then trigger the delay unit 100 μ s that delay time through logic gates, output high level in time-delay back does not then start time-delay if be no more than the voltage setting valve;
Another road signal at first passes through low-pass filter unit; Signal behind LPF is compared with the second voltage setting valve through second voltage comparison unit, if surpass the voltage setting valve, then starts time-delay; The signal of delaying time behind the 100 μ s still surpasses the second voltage setting valve, then exports high level; Then do not start time-delay if be no more than the voltage setting valve;
The Rogowski coil is measured integral output signal and is compared with the tertiary voltage setting valve through the tertiary voltage comparing unit, if the signal behind the time-delay 100 μ s still surpasses the tertiary voltage setting valve, then exports high level, does not then start time-delay if be no more than the voltage setting valve;
If three road signals are exported high level simultaneously and then relay sent action command, after the actuating of relay, then counter is carried out zero clearing.
If the Rogowski coil is measured differential output and the signal after time-delay surpasses short-circuit current differential value peak value, then relay is sent action command, after the actuating of relay, then counter is carried out zero clearing.
Described short-circuit current differential and integrated signal are based on that the measurement of outer integral form flexible hollow Rogowski coil current mutual inductor obtains.
The present invention is based on the protection strategy that amplitude of short circuit and two kinds of criterions of short-circuit current escalating rate combine; Under this mode; Improved the reliability of protective device action, under than the condition of strong electromagnetic, still can keep good Electro Magnetic Compatibility, greatly degree has reduced the possibility of trip gear malfunction; Simultaneously can assurance device under condition than strong electromagnetic, accurate operate as normal still.Simultaneously, the present invention can also detect current failure fast in the microsecond magnitude, can well reduce under short-circuit conditions the impact to system, and has alleviated the burden of isolating switch, is the apparatus and method of a kind of effective straight-flow system short-circuit current fault detect.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Referring to Fig. 1, the present invention includes the Rogowski coil, this Rogowski coil is measured differential output signal and is divided into two-way: the one tunnel successively with high pass filter unit 1, first voltage comparison unit 2, logic gates 3 and trigger delay unit 4 and be connected; Another road signal is connected with low-pass filter unit 5, second voltage comparison unit 6 successively; The Rogowski coil is measured integral output signal and is connected with tertiary voltage comparing unit 7; Wherein delay unit 4 adopts counter to replace complicated delay circuit, adopts the CMOS integrated circuit to improve circuit antijamming capability and job stability and improved delay precision.
Referring to Fig. 1; Detection method of the present invention is following: short-circuit current differential and integrated signal are based on that the measurement of outer integral form flexible hollow Rogowski coil current mutual inductor obtains; The Rogowski coil is measured differential output signal and is divided into two-way: one road signal at first passes through high pass filter unit 1; Signal after high-pass filtering is compared with the first voltage setting valve through first voltage comparison unit 2, if surpass the voltage setting valve, then triggers delay unit 4 time-delays 100 μ s through logic gates 3; Output high level in time-delay back does not then start time-delay if be no more than the voltage setting valve;
Another road signal at first passes through low-pass filter unit 5; Signal behind LPF is compared with the second voltage setting valve through second voltage comparison unit 6, if surpass the voltage setting valve, then starts time-delay; The signal of delaying time behind the 100 μ s surpasses the second voltage setting valve, then exports high level; Then do not start time-delay if be no more than the voltage setting valve;
The Rogowski coil is measured integral output signal and is compared with the tertiary voltage setting valve through tertiary voltage comparing unit 7, if the signal behind the time-delay 100 μ s surpasses the tertiary voltage setting valve, then exports high level, does not then start time-delay if be no more than the voltage setting valve;
If three road signals are exported high level simultaneously and then relay sent action command, after the actuating of relay, then counter is carried out zero clearing.
If Rogowski coil measurement differential output and the signal after time-delay surpass short-circuit current differential value peak value and are as the criterion much larger than neighbourhood noise voltage, then relay is sent action command, after the actuating of relay, then counter is carried out zero clearing.
The protection that the present invention is based on current-rising-rate with Rogowski coil differential through the output after relatively of the signal of high-pass filtering and voltage setting valve as enabling signal; Trigger circuit time-delay, delay circuit are adopted counter to replace complicated delay circuit and have been improved delay precision; And with the output of Rogowski coil differential after the signal of LPF and voltage setting valve are relatively delayed time 100 μ s as criterion 1, Rogowski coil integrated signal and voltage setting valve are relatively delayed time output behind the 100 μ s as criterion 2.The signal of the Rogowski differential being exported after high-pass filtering based on the protection of current-rising-rate has greatly reduced the influence that is caused of low-frequency disturbance and side-play amount as enabling signal.
Claims (5)
1. one kind based on Luo-coil direct-current short circuit current failure pick-up unit; It is characterized in that: comprise the Rogowski coil, this Rogowski coil is measured differential output signal and is divided into two-way: the one tunnel is connected with high pass filter unit (1), first voltage comparison unit (2), logic gates (3) and circuit delay unit (4) successively;
Another road signal is connected with low-pass filter unit (5), second voltage comparison unit (6) successively;
The Rogowski coil is measured integral output signal and is connected with tertiary voltage comparing unit (7).
2. according to claim 1 based on Luo-coil direct-current short circuit current failure pick-up unit, it is characterized in that: described delay unit (4) adopts the CMOS integrated counter.
3. detection method based on Luo-coil direct-current short circuit current failure pick-up unit as claimed in claim 1; It is characterized in that: the Rogowski coil is measured differential output signal and is divided into two-way: one road signal at first passes through high pass filter unit (1); Signal after high-pass filtering is compared with the first voltage setting valve through first voltage comparison unit (2); If surpass the voltage setting valve; Then pass through logic gates (3) and trigger delay unit (4) time-delay 100 μ s, output high level in time-delay back does not then start time-delay if be no more than the voltage setting valve;
Another road signal at first passes through low-pass filter unit (5); Signal behind LPF is compared with the second voltage setting valve through second voltage comparison unit (6), if surpass the voltage setting valve, then starts time-delay; The signal of delaying time behind the 100 μ s still surpasses the second voltage setting valve, then exports high level; Then do not start time-delay if be no more than the voltage setting valve;
The Rogowski coil is measured integral output signal and is compared with the tertiary voltage setting valve through tertiary voltage comparing unit (7); If the signal behind the time-delay 100 μ s still surpasses the tertiary voltage setting valve; Then export high level, then do not start time-delay if be no more than the voltage setting valve;
If three road signals are exported high level simultaneously and then relay sent action command, after the actuating of relay, then counter is carried out zero clearing.
4. according to claim 3 based on Luo-coil direct-current short circuit current failure detection method; It is characterized in that: if the Rogowski coil is measured differential output and the signal after time-delay surpasses short-circuit current differential value peak value; Then relay is sent action command; After the actuating of relay, then counter is carried out zero clearing.
5. according to claim 3 based on Luo-coil direct-current short circuit current failure detection method, it is characterized in that: described short-circuit current differential and integrated signal are based on that the measurement of outer integral form flexible hollow Rogowski coil current mutual inductor obtains.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102717087A CN102435827A (en) | 2011-09-15 | 2011-09-15 | Rogowski coil-based method and Rogowski coil-based device for detecting direct-current short-circuit current fault |
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| CN2011102717087A CN102435827A (en) | 2011-09-15 | 2011-09-15 | Rogowski coil-based method and Rogowski coil-based device for detecting direct-current short-circuit current fault |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616549A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | Broadband low-current measurement device based on isolated PCB-type Rogowski coil |
| CN106786430A (en) * | 2017-01-19 | 2017-05-31 | 上海电气集团股份有限公司 | A kind of discriminating conduct of short circuit malfunction |
| CN107132390A (en) * | 2016-02-26 | 2017-09-05 | Ls 产电株式会社 | For the equipment for the defect for detecting electic power system |
| CN107576880A (en) * | 2017-09-21 | 2018-01-12 | 哈尔滨理工大学 | A kind of Power System Shortcuts current detecting identifier |
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| GB2119935A (en) * | 1982-05-05 | 1983-11-23 | Dorman Smith Switchgear Ltd | Short circuit current protection |
| CN101477167A (en) * | 2008-01-01 | 2009-07-08 | 浙江广天变压器有限公司 | Voltage differential transformer turn-to-turn short circuit detection apparatus |
| US7638999B2 (en) * | 2006-04-07 | 2009-12-29 | Cooper Technologies Company | Protective relay device, system and methods for Rogowski coil sensors |
| CN201886112U (en) * | 2010-12-09 | 2011-06-29 | 中国舰船研究设计中心 | Automatic wave-recording device of short current in DC amplitude voltage electric grid of ship |
| CN102128966A (en) * | 2011-01-11 | 2011-07-20 | 沈阳互感器有限责任公司 | Rogowski coil-based integrator circuit for electronic current transformer |
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2011
- 2011-09-15 CN CN2011102717087A patent/CN102435827A/en active Pending
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| GB2119935A (en) * | 1982-05-05 | 1983-11-23 | Dorman Smith Switchgear Ltd | Short circuit current protection |
| US7638999B2 (en) * | 2006-04-07 | 2009-12-29 | Cooper Technologies Company | Protective relay device, system and methods for Rogowski coil sensors |
| CN101477167A (en) * | 2008-01-01 | 2009-07-08 | 浙江广天变压器有限公司 | Voltage differential transformer turn-to-turn short circuit detection apparatus |
| CN201886112U (en) * | 2010-12-09 | 2011-06-29 | 中国舰船研究设计中心 | Automatic wave-recording device of short current in DC amplitude voltage electric grid of ship |
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Non-Patent Citations (2)
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| 王书礼: "《限流开断技术的研究》", 31 December 2009 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616549A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | Broadband low-current measurement device based on isolated PCB-type Rogowski coil |
| CN107132390A (en) * | 2016-02-26 | 2017-09-05 | Ls 产电株式会社 | For the equipment for the defect for detecting electic power system |
| CN106786430A (en) * | 2017-01-19 | 2017-05-31 | 上海电气集团股份有限公司 | A kind of discriminating conduct of short circuit malfunction |
| CN106786430B (en) * | 2017-01-19 | 2018-12-18 | 上海电气集团股份有限公司 | A kind of discriminating conduct of short circuit malfunction |
| CN107576880A (en) * | 2017-09-21 | 2018-01-12 | 哈尔滨理工大学 | A kind of Power System Shortcuts current detecting identifier |
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Application publication date: 20120502 |