CN103323655A - 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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- CN103323655A CN103323655A CN2013102270640A CN201310227064A CN103323655A CN 103323655 A CN103323655 A CN 103323655A CN 2013102270640 A CN2013102270640 A CN 2013102270640A CN 201310227064 A CN201310227064 A CN 201310227064A CN 103323655 A CN103323655 A CN 103323655A
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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 that the Non-contact DC/AC crosstalk detects online principle analysis and method and Non-contact DC/AC crosstalk on-line detecting system and makes up.The method and system can be in the situation that do not contact transformer station's live terminal, the detection of conveniently scurrying into straight-flow system for transformer station's interchange.The method and system belong to the power automation technical field.
Background technology
DC power system plays an important role to the safe operation that guarantees full station equipment as the important component part of transformer station.It provides power supply for equipment such as signalling arrangement, protection equipment, circuit-breaker switching on-off operation, emergency lightings, 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, DC earthing often occurs in actual motion, exchanges faults such as scurrying into straight-flow system, and wherein to scurry into the DC Line Fault destructiveness larger in interchange.Because existing alternating current in the screen cabinet has again direct current, power cable is longer again, and the alternating current-direct current terminal is separated by nearer, often can because mis-wired or insulation reduce, cause alternating current to scurry into straight-flow system.DC Line Fault is scurried in interchange can cause device damage when serious, or the protection equipment malfunction, and operation brings and has a strong impact on to substation safety.
Substation field lacks effective monitoring means and fault warning measure to " DC Line Fault is scurried in interchange " at present, a kind of being connected on the positive and negative busbar installed by part transformer station, by measuring positive mother, bearing the device that female voltage-to-ground detects AC compounent in the straight-flow system online.Yet use this device to have the hidden danger of two aspects: 1) device reliability is on the impact of DC power system, because it just is being connected on/is bearing between mother and the ground, plant failure probably directly causes DC earthing; 2) the device mounting process is on the impact of operational outfit, and for the transformer station that puts into operation, owing to DC power system electrical connection being arranged, mounting process missionary society directly has influence on the normal operation of operational outfit.
Alternating current-direct current crosstalk online measuring technique is now not yet ripe, how under the prerequisite that guarantees straight-flow system stable operation, detects exactly to exchange and scurries into DC Line Fault and become problem demanding prompt solution.
Summary of the invention
Technical matters to be solved by this invention is under the prerequisite that guarantees straight-flow system stable operation, detects exactly alternating current 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, be provided with DC loop cable jaws on the contactless voltage clamp, described measurement electric capacity one end is connected to DC loop cable jaws, other end ground connection, measure simultaneously the electric capacity two ends and be connected to respectively data collecting plate card, the data collecting plate card output terminal is connected with Non-contact DC/AC crosstalk detection module input end, forms contactless coupling capacitance C between described DC loop cable jaws and the cable inner conductor
1
Aforesaid Non-contact DC/AC crosstalk on-line measuring device is characterized in that, also comprises the alarm output module, and Non-contact DC/AC crosstalk detection module output terminal is connected with the alarm output module.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device is characterized in that, the 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 installed in contactless voltage clamp inside.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device is characterized in that, described DC loop cable jaws inside surface is the conduction software.
Aforesaid Non-contact DC/AC crosstalk on-line measuring device is characterized in that, measures capacitor C
2Value is known quantity.
The online test method of aforementioned Non-contact DC/AC crosstalk on-line measuring device is characterized in that, may further comprise the steps:
1) to measuring capacitor C
2On get alternating voltage component U
AcCorresponding alternating voltage U
2Measure;
2) according to formula U
2=U
Ac* C
1/ (C
1+ C
2), calculate alternating voltage component U
Ac
3) utilize the voltage detecting analytic system to alternating voltage component U
AcCompare judgement, with U
AcScurry into the alarm voltage U with exchanging of can setting of internal system
ZdCompare, if U
Ac＞U
ZdThen send to exchange by the 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 capacitor C
2Choosing and contactless coupling capacitance C
1The electric capacity of the same order of magnitude.
Beneficial effect that the present invention reaches:
The present invention proposes a kind of contactless alternating current-direct current crosstalk online test method, and made up Non-contact DC/AC crosstalk on-line detecting system, Non-contact DC/AC crosstalk online test method is by dismountable non-contact capacitance of customization, be enclosed within on the transforming plant DC return wire, in addition again by a dividing potential drop electric capacity, be coupled out the voltage in the DC loop, analyze through conversion, can detect and whether contain AC compounent in the DC loop, realize that contactless alternating current-direct current crosstalk detects.
Description of drawings
Fig. 1 is Non-contact DC/AC crosstalk detection system schematic diagram;
Fig. 2 is that the Non-contact DC/AC crosstalk detects the loop schematic diagram online;
Fig. 3 is that the Non-contact DC/AC crosstalk detects Equivalent Circuit figure.
Embodiment
Non-contact DC/AC crosstalk on-line detecting system: as shown in Figure 1, whether Non-contact DC/AC crosstalk on-line detecting system utilizes contactless coupling capacitance and measures the existence whether the alternating voltage component is arranged in the capacitance detecting DC loop, have AC signal to scurry into straight-flow system thereby detect.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, be provided with DC loop cable jaws on the contactless voltage clamp, described measurement electric capacity one end is connected to DC loop cable jaws, other end ground connection, measure simultaneously the electric capacity two ends and be connected to respectively data collecting plate card, the data collecting plate card output terminal is connected with Non-contact DC/AC crosstalk detection module input end, forms contactless coupling capacitance C between described DC loop cable jaws and the cable inner conductor
1
Non-contact DC/AC crosstalk detection module is the kernal hardware module of this system, the software that utilization writes is realized contactless loop voltage measurement, program is the voltage data of reading out data analog input card collection automatically, and carry out voltage analysis according to data, detect the AC compounent in its voltage waveform.Judge it is that the direct-current secondary loop is disturbed by calculating the alternating voltage effective value, or having in the straight-flow system to exchange scurries into, and has certain anti-interference, guarantee that straight-flow system has interchange can accurately send alarm signal when scurrying into.
Contactless voltage clamp is used to form contactless coupling capacitance and measures electric capacity, contactless voltage clamp is clipped on the direct current cables loop, DC loop cable jaws 1 forms contactless coupling capacitance with cable, measures electric capacity and also is installed in contactless voltage clamp inside.Can the AC compounent in the straight-flow system of measuring alternating current-direct current crosstalk detection module exactly depend on the manufacture craft of contactless voltage clamp to a great extent.
Data collecting plate card is used for measuring the voltage data collection of electric capacity, and can the stored voltage waveform.The alarm output module can be a relay, exchanges when scurrying into straight-flow system when detection module has detected, and the alarm output module can send alarm signal, and as required the alarm contact is exported.
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 the direct current cables voltage-to-ground, detect to have to exchange and 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 (electric capacity that forms between the conduction software by being rolled in the cable outside surface and the cable inner conductor), measure capacitor C
2, the secondary circuit voltage measuring and analysis system, i.e. Non-contact DC/AC crosstalk detection module is the processing unit that possesses voltage measurement and wave form analysis, C
1And C
2Series connection ground connection, wherein C
1Large I records C
2Size is known.
Online detection concrete steps of the present invention comprise:
1) to measuring capacitor C
2On get alternating voltage component U
AcCorresponding alternating voltage U
2Measure;
2) according to formula U
2=U
Ac* C
1/ (C
1+ C
2), calculate alternating voltage component U
Ac
3) utilize the voltage detecting analytic system to alternating voltage component U
AcThe judgement of comparing is with U
AcScurry into the alarm voltage U with exchanging of can setting of internal system
ZdCompare, if U
Ac＞U
ZdThen send to exchange by the alarm output module and scurry into alarm signal.
As shown in Figure 2, because AC system is earthed system, because Insulation Problems causes exchanging when invading, must in the cable voltage-to-ground, measure AC compounent when secondary circuit cable.The secondary circuit cable voltage-to-ground can be at contactless coupling capacitance C
1With the measurement capacitor C
2Upper formation dividing potential drop, the secondary circuit voltage measuring and analysis system detects the voltage of measuring electric capacity, and then obtains the voltage-to-ground of secondary circuit cable by analytical calculation.
Suppose that the secondary circuit cable voltage-to-ground is U, when having interchange to scurry into straight-flow system, it comprises DC component U
DcWith AC compounent U
Ac, U=U then
Dc+ U
AcIts Equivalent Circuit is as shown in Figure 3:
U
1, U
2Respectively the voltage of getting on contactless coupling capacitance and the measurement electric capacity, according to Circuit theory, the AC compounent U in the secondary circuit cable voltage-to-ground
AcThe voltage U of measuring electric capacity and getting
2=U
Ac* C
1/ (C
1+ C
2).Because electric capacity " is handed over " effect, DC component U every straight-through
DcGet voltage at electric capacity and be zero.
Above-mentioned analysis when only having secondary circuit cable to scurry into AC compounent, is measured on the electric capacity and just can be recorded alternating voltage U as can be known
2Because contactless coupling capacitance C
1Can't accurately measure, and not identical for its capacitance of different system, but can record the general order of magnitude.In order to obtain to measure as far as possible exactly the voltage of electric capacity, should select the electric capacity with the same order of magnitude of contactless coupling capacitance during State selective measurements electric capacity.
By the secondary circuit voltage measuring and analysis system loop voltage is carried out in-service monitoring, and the voltage waveform that gathers is analyzed, can calculate alternating voltage component in the loop, and then judge whether to have in the DC loop to exchange and scurry into.
The Non-contact DC/AC crosstalk online test method that proposes among the present invention and the on-line detecting system of structure carry out verification experimental verification in the laboratory.By the method for injected AC source in straight-flow system, so that the invasion of interchange is arranged in the straight-flow system, assess the validity of alternating current-direct current crosstalk online test method in this invention and the practicality of detection system.Whether testing result shows, utilize this detection system to reflect fast and accurately to have in the straight-flow system to exchange 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 replaces or technical scheme that the equivalent transformation mode obtains, all drops within protection scope of the present invention.
Claims (8)
1. 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, be provided with DC loop cable jaws on the contactless voltage clamp, described measurement electric capacity one end is connected to DC loop cable jaws, other end ground connection, measure simultaneously the electric capacity two ends and be connected to respectively data collecting plate card, the data collecting plate card output terminal is connected with Non-contact DC/AC crosstalk detection module input end, forms contactless coupling capacitance C between described DC loop cable jaws and the cable inner conductor
1
2. Non-contact DC/AC crosstalk on-line measuring device according to claim 1 is characterized in that, also comprises the alarm output module, and Non-contact DC/AC crosstalk detection module output terminal is connected with the alarm output module.
3. Non-contact DC/AC crosstalk on-line measuring device according to claim 2 is characterized in that, the alarm output module is a relay.
4. Non-contact DC/AC crosstalk on-line measuring device according to claim 1 is characterized in that, measures electric capacity and is installed in contactless voltage clamp inside.
5. Non-contact DC/AC crosstalk on-line measuring device according to claim 1 is characterized in that, described DC loop cable jaws inside surface is the conduction software.
6. Non-contact DC/AC crosstalk on-line measuring device according to claim 3 is characterized in that, measures capacitor C
2Value is known quantity.
7. a right to use requires the online test method of 1 described Non-contact DC/AC crosstalk on-line measuring device, it is characterized in that, may further comprise the steps:
1) to measuring capacitor C
2On get alternating voltage component U
AcCorresponding alternating voltage U
2Measure;
2) according to formula U
2=U
Ac* C
1/ (C
1+ C
2), calculate alternating voltage component U
Ac
3) utilize the voltage detecting analytic system to alternating voltage component U
AcThe judgement of comparing is with U
AcScurry into the alarm voltage U with exchanging of can setting of internal system
ZdCompare, if U
Ac＞U
ZdThen send to exchange by the alarm output module and scurry into alarm signal.
8. the online test method of Non-contact DC/AC crosstalk on-line measuring device according to claim 7 is characterized in that, measures capacitor 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 CN103323655B (en) | 2015-04-29 |
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| CN105116352A (en) * | 2015-09-01 | 2015-12-02 | 国网辽宁省电力有限公司鞍山供电公司 | Mixed connection detection method of two sets of direct-current power supply systems of transformer substation |
| CN108072856A (en) * | 2016-11-11 | 2018-05-25 | 弗兰克公司 | The verification unit of contactless voltage measurement system |
| CN113176441A (en) * | 2021-06-11 | 2021-07-27 | 广西电网有限责任公司电力科学研究院 | Non-contact voltage measuring device and method |
| CN113238089A (en) * | 2021-06-11 | 2021-08-10 | 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 |
| 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 |
| 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 |
| CN115267301A (en) * | 2022-09-30 | 2022-11-01 | 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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