CN103323655B - Non-contact alternating current and direct current crosstalk online detecting device and non-contact alternating current and direct current crosstalk online detecting method - Google Patents
Non-contact alternating current and direct current crosstalk online detecting device and non-contact alternating current and direct current crosstalk online detecting method Download PDFInfo
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- CN103323655B CN103323655B CN201310227064.0A CN201310227064A CN103323655B CN 103323655 B CN103323655 B CN 103323655B CN 201310227064 A CN201310227064 A CN 201310227064A CN 103323655 B CN103323655 B CN 103323655B
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Abstract
The invention discloses a non-contact alternating current and direct current crosstalk online detecting device. The non-contact alternating current and direct current crosstalk online detecting device is characterized by comprising a non-contact voltage acquisition device, a data acquisition plate card and a non-contact alternating current and direct current crosstalk detecting module. The non-contact voltage acquisition device comprises a non-contact voltage clamp, a direct current return cable clamp mouth is formed in the non-contact voltage clamp, one end of a measuring capacitor is connected to the direct current return cable clamp mouth, the other end of the measuring capacitor is connected to the ground, the two ends of the measuring capacitor are connected to the data acquisition plate card respectively, the output end of the data acquisition plate card is connected with the input end of the non-contact alternating current and direct current crosstalk detecting module, and a non-contact coupling capacitor is formed between the direct current return cable clamp mouth and a cable inner conductor. The non-contact alternating current and direct current crosstalk online detecting device and a non-contact alternating current and direct current crosstalk online detecting method can accurately detect the failure caused by the situation that an alternating current flows into a direct current system.
Description
Technical field
The present invention relates to the method for testing of transformer station direct current system Non-contact DC/AC crosstalk, comprise Non-contact DC/AC crosstalk on-line checkingi principle analysis and method and Non-contact DC/AC crosstalk on-line detecting system and build.The method and system can when not contacting transformer station's live terminal, and the convenient transformer station that is used for exchanges the detection of scurrying into straight-flow system.The method and system belong to technical field of electric power automation.
Background technology
DC power system, as the important component part of transformer station, plays an important role to the safe operation of the full station equipment of guarantee.The equipment such as it is signalling arrangement, the operation of proterctive equipment, circuit-breaker switching on-off, emergency lighting provide power supply, and its safe and reliable operation is most important for the safe and reliable operation of transformer station.But because DC power supply equipment is many, power cable is long, in actual motion, often there is DC earthing, exchange and scurry into the faults such as straight-flow system, wherein exchange that to scurry into DC Line Fault destructiveness larger.Due to existing alternating current in a screen cabinet, have direct current again, power cable is longer again, and alternating current-direct current terminal is separated by comparatively near, often can, because mis-wired or insulation reduce, cause alternating current to scurry into straight-flow system.Interchange scurry into DC Line Fault serious time can cause device damage, or proterctive equipment malfunction, run to bring to substation safety and have a strong impact on.
Current substation field lacks effective monitoring means and fault warning measure to " DC Line Fault is scurried in interchange ", part transformer station has installed one and has been connected on positive and negative busbar, by measuring the device of AC compounent in positive mother, negative female voltage-to-ground on-line checkingi straight-flow system.But use this device to deposit hidden danger both ways: 1) device reliability is on the impact of DC power system, and because it is connected between positive/negative mother and ground, plant failure probably directly causes DC earthing; 2) device mounting process is on the impact of operational outfit, and for the transformer station that puts into operation, owing to having electrical connection with DC power system, mounting process missionary society directly has influence on the normal work of operational outfit.
Alternating current-direct current crosstalk online measuring technique is now not yet ripe, how under the prerequisite ensureing straight-flow system stable operation, detects interchange exactly and scurries into DC Line Fault and become problem demanding prompt solution.
Summary of the invention
Technical problem to be solved by this invention is under the prerequisite ensureing straight-flow system stable operation, detects alternating current exactly and scurries into DC system fault.
For solving the problems of the technologies described above, the invention provides a kind of Non-contact DC/AC crosstalk on-line measuring device, it is characterized in that, comprise contactless voltage collecting device, data collecting plate card and Non-contact DC/AC crosstalk detection module, described contactless voltage collecting device comprises contactless voltage clamp, contactless voltage clamp is provided with DC loop cable jaws, described measurement electric capacity one end is connected to DC loop cable jaws, other end ground connection, measure electric capacity two ends simultaneously and be connected to data collecting plate card respectively, data collecting plate card output is connected with Non-contact DC/AC crosstalk detection module input, contactless coupling capacitance C is formed between described DC loop cable jaws and cable inner conductor
1.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device, is characterized in that, also comprise alarm output module, and Non-contact DC/AC crosstalk detection module output is connected with alarm output module.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device, is characterized in that, alarm output module is a relay.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device, is characterized in that, measures electric capacity and is arranged on contactless voltage clamp inside.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device, is characterized in that, described DC loop cable jaws inner surface is conduction software.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device, is characterized in that, measures electric capacity C
2value is known quantity.
The online test method of aforementioned Non-contact DC/AC crosstalk on-line measuring device, is characterized in that, comprise the following steps:
1) to measurement electric capacity C
2on get alternating current voltage component U
accorresponding alternating voltage U
2measure;
2) according to formula U
2=U
ac* C
1/ (C
1+ C
2), calculate alternating current voltage component U
ac;
3) utilize voltage detecting analytical system to alternating current voltage component U
accompare judgement, by U
acalarm voltage U is scurried into exchanging of can setting of internal system
zdcompare, if U
ac> U
zdthen send interchange by alarm output module and scurry into alarm signal.
The online test method of aforesaid Non-contact DC/AC crosstalk on-line measuring device, is characterized in that, measures electric capacity C
2choosing and contactless coupling capacitance C
1the electric capacity of the same order of magnitude.
The present invention reaches beneficial effect:
The present invention proposes a kind of contactless alternating current-direct current crosstalk online test method, and construct Non-contact DC/AC crosstalk on-line detecting system, Non-contact DC/AC crosstalk online test method is by customization dismountable non-contact capacitance, be enclosed within transforming plant DC return wire, in addition again by a derided capacitors, be coupled out the voltage in DC loop, analyze through conversion, can detect in DC loop and whether contain AC compounent, achieve contactless alternating current-direct current crosstalk and detect.
Accompanying drawing explanation
Fig. 1 is Non-contact DC/AC crosstalk detection system schematic diagram;
Fig. 2 is Non-contact DC/AC crosstalk on-line checkingi circuit diagram;
Fig. 3 is that Non-contact DC/AC crosstalk detects Equivalent Circuit figure.
Detailed description of the invention
Non-contact DC/AC crosstalk on-line detecting system: as shown in Figure 1, Non-contact DC/AC crosstalk on-line detecting system utilizes contactless coupling capacitance and measures the existence whether having alternating current voltage component in capacitance detecting DC loop, thus whether detection has AC signal to scurry into straight-flow system.Non-contact DC/AC crosstalk on-line detecting system comprises: contactless voltage collecting device, data collecting plate card and Non-contact DC/AC crosstalk detection module, described contactless voltage collecting device comprises contactless voltage clamp, contactless voltage clamp is provided with DC loop cable jaws, described measurement electric capacity one end is connected to DC loop cable jaws, other end ground connection, measure electric capacity two ends simultaneously and be connected to data collecting plate card respectively, data collecting plate card output is connected with Non-contact DC/AC crosstalk detection module input, contactless coupling capacitance C is formed between described DC loop cable jaws and cable inner conductor
1.
Non-contact DC/AC crosstalk detection module is the hard core module of this system, the contactless loop voltage of the software simulating of write is utilized to measure, program can read the voltage data that data collecting plate card gathers automatically, and carry out voltage analysis according to data, detect the AC compounent in its voltage waveform.Judge it is that direct-current secondary loop is disturbed by calculating alternating voltage virtual value, or in straight-flow system, have interchange to scurry into, there is certain anti-interference, when ensureing that straight-flow system has interchange to scurry into, accurately can send alarm signal.
Contactless voltage clamp is for the formation of contactless coupling capacitance and measure electric capacity, contactless voltage clamp is clipped on direct current cables loop, DC loop cable jaws 1 and cable form contactless coupling capacitance, measure electric capacity and are also arranged on contactless voltage clamp inside.Can the alternating current-direct current crosstalk detection module AC compounent measured exactly in straight-flow system depend on the manufacture craft of contactless voltage clamp to a great extent.
Data collecting plate card is for measuring the voltage data collection of electric capacity, and energy stored voltage waveform.Alarm output module can be a relay, and when detection module has detected that straight-flow system is scurried in interchange, alarm output module can send alarm signal, and is exported by alarm contact as required.
Based on above hardware and software module construction Non-contact DC/AC crosstalk on-line detecting system, as shown below.Whether this system can carry out in-service monitoring to direct current cables voltage-to-ground, detect and have interchange to scurry into straight-flow system.
Non-contact DC/AC crosstalk online test method:
Non-contact DC/AC crosstalk online test method as shown in Figure 2, C
1for contactless coupling capacitance (by being rolled in the electric capacity formed between the conduction software of cable outer surface and cable inner conductor), measure electric capacity C
2, secondary circuit voltage measuring and analysis system, namely Non-contact DC/AC crosstalk detection module is the processing unit possessing voltage measurement and waveform analysis, C
1and C
2series connection ground connection, wherein C
1large I records, C
2size is known.
On-line checkingi concrete steps of the present invention comprise:
1) to measurement electric capacity C
2on get alternating current voltage component U
accorresponding alternating voltage U
2measure;
2) according to formula U
2=U
ac* C
1/ (C
1+ C
2), calculate alternating current voltage component U
ac;
3) utilize voltage detecting analytical system to alternating current voltage component U
acto compare judgement, by U
acalarm voltage U is scurried into exchanging of can setting of internal system
zdcompare, if U
ac> U
zdthen send interchange by alarm output module and scurry into alarm signal.
As shown in Figure 2, because AC system is earthed system, when secondary circuit cable causes exchanging invasion due to Insulation Problems, AC compounent must be measured in cable voltage-to-ground.Secondary circuit cable voltage-to-ground can at contactless coupling capacitance C
1with measurement electric capacity C
2upper formation dividing potential drop, secondary circuit voltage measuring and analysis system detects the voltage measuring electric capacity, and then is obtained the voltage-to-ground of secondary circuit cable by analytical calculation.
Suppose that secondary circuit cable voltage-to-ground is U, when there being interchange to scurry into straight-flow system, it comprises DC component U
dcwith AC compounent U
ac, then U=U
dc+ U
ac.Its Equivalent Circuit is as shown in Figure 3:
U
1, U
2be contactless coupling capacitance respectively and measure the voltage that electric capacity is got, according to Circuit theory, the AC compounent U in secondary circuit cable voltage-to-ground
acmeasuring the voltage U that electric capacity is got
2=U
ac* C
1/ (C
1+ C
2).Due to electric capacity " every straight-through friendship " effect, DC component U
dcelectric capacity is got voltage and is zero.
Above-mentioned analysis is known, when only having secondary circuit cable to scurry into AC compounent, measures on electric capacity and just can record alternating voltage U
2.Due to contactless coupling capacitance C
1cannot accurately measure, and not identical for its capacitance of different system, but the general order of magnitude can be recorded.In order to obtain the voltage measuring electric capacity as far as possible exactly, select should select the electric capacity with the same order of magnitude of contactless coupling capacitance when measuring electric capacity.
By secondary circuit voltage measuring and analysis system, in-service monitoring is carried out to loop voltage, and the voltage waveform gathered is analyzed, alternating current voltage component in loop can be calculated, and then judge in DC loop, whether have interchange to scurry into.
The Non-contact DC/AC crosstalk online test method proposed in the present invention and the on-line detecting system of structure carry out verification experimental verification in laboratory.By the method for injected AC source in straight-flow system, make to have in straight-flow system to exchange and invade, assess the validity of alternating current-direct current crosstalk online test method and the practicality of detection system in this invention.Testing result shows, whether utilize this detection system can reflect fast and accurately in straight-flow system has interchange to scurry into.
Below disclose the present invention with preferred embodiment, so it is not intended to limiting the invention, and all employings are equal to replacement or the technical scheme that obtains of equivalent transformation mode, all drop within protection scope of the present invention.
Claims (7)
1. a Non-contact DC/AC crosstalk on-line measuring device, it is characterized in that, comprise contactless voltage collecting device, data collecting plate card and Non-contact DC/AC crosstalk detection module, described contactless voltage collecting device comprises contactless voltage clamp, contactless voltage clamp is provided with DC loop cable jaws, measures electric capacity C
2one end is connected to DC loop cable jaws, other end ground connection, measures electric capacity C simultaneously
2two ends are connected to data collecting plate card respectively, and data collecting plate card output is connected with Non-contact DC/AC crosstalk detection module input, forms contactless coupling capacitance C between described DC loop cable jaws and cable inner conductor
1; Also comprise alarm output module, Non-contact DC/AC crosstalk detection module output is connected with alarm output module.
2. Non-contact DC/AC crosstalk on-line measuring device according to claim 1, is characterized in that, alarm output module is a relay.
3. Non-contact DC/AC crosstalk on-line measuring device according to claim 1, is characterized in that, measures electric capacity C
2be arranged on contactless voltage clamp inner.
4. Non-contact DC/AC crosstalk on-line measuring device according to claim 1, is characterized in that, described DC loop cable jaws inner surface is conduction software.
5. Non-contact DC/AC crosstalk on-line measuring device according to claim 2, is characterized in that, measures electric capacity C
2value is known quantity.
6. use an online test method for Non-contact DC/AC crosstalk on-line measuring device described in claim 1, it is characterized in that, comprise the following steps:
1) to measurement electric capacity C
2on get alternating current voltage component U
accorresponding alternating voltage U
2measure;
2) according to formula U
2=U
ac* C
1/ (C
1+ C
2), calculate alternating current voltage component U
ac;
3) utilize Non-contact DC/AC crosstalk detection module to alternating current voltage component U
acto compare judgement, by U
acalarm voltage U is scurried into exchanging of can setting of internal system
zdcompare, if U
ac> U
zdthen send interchange by alarm output module and scurry into alarm signal.
7. the online test method of Non-contact DC/AC crosstalk on-line measuring device according to claim 6, is characterized in that, measures electric capacity C
2choosing and contactless coupling capacitance C
1the electric capacity of the same order of magnitude.
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|---|---|---|---|
| CN201310227064.0A CN103323655B (en) | 2013-06-08 | 2013-06-08 | Non-contact alternating current and direct current crosstalk online detecting device and non-contact alternating current and direct current crosstalk online detecting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310227064.0A CN103323655B (en) | 2013-06-08 | 2013-06-08 | Non-contact alternating current and direct current crosstalk online detecting device and non-contact alternating current and direct current crosstalk online detecting method |
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| CN103323655B true CN103323655B (en) | 2015-04-29 |
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| CN105116352B (en) * | 2015-09-01 | 2018-06-26 | 国网辽宁省电力有限公司鞍山供电公司 | The double set DC power system string electro-detection methods of substation |
| US10359494B2 (en) * | 2016-11-11 | 2019-07-23 | Fluke Corporation | Proving unit for non-contact voltage measurement systems |
| CN110940928A (en) * | 2019-12-13 | 2020-03-31 | 上海华电电力发展有限公司望亭发电分公司 | AC fleeing positioning detection device for power plant DC system |
| CN113238089B (en) * | 2021-06-11 | 2022-07-01 | 广西电网有限责任公司电力科学研究院 | Non-contact voltage measuring method, non-contact voltage measuring device, computer equipment and storage medium |
| CN113176441B (en) * | 2021-06-11 | 2022-07-01 | 广西电网有限责任公司电力科学研究院 | Non-contact voltage measuring device and method |
| CN113721071A (en) * | 2021-07-16 | 2021-11-30 | 中国电力科学研究院有限公司 | System and method for measuring non-intrusive voltage to ground |
| CN113608013A (en) * | 2021-08-05 | 2021-11-05 | 珠海市科荟电器有限公司 | Non-contact electricity utilization detection device and detection method thereof |
| CN115267301B (en) * | 2022-09-30 | 2023-01-20 | 南方电网数字电网研究院有限公司 | Voltage measuring method, voltage measuring device, computer equipment and storage medium |
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