CN103018525A - Synchronous measurement device and method of short-circuit current distribution in transformer substation - Google Patents
Synchronous measurement device and method of short-circuit current distribution in transformer substation Download PDFInfo
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- CN103018525A CN103018525A CN2012105103043A CN201210510304A CN103018525A CN 103018525 A CN103018525 A CN 103018525A CN 2012105103043 A CN2012105103043 A CN 2012105103043A CN 201210510304 A CN201210510304 A CN 201210510304A CN 103018525 A CN103018525 A CN 103018525A
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Abstract
The invention discloses a synchronous measurement device of short-circuit current distribution in a transformer substation. The synchronous measurement device of the short-circuit current distribution in the transformer substation comprises a plurality of oscilloscopes, wherein an external trigger signal of an oscilloscope serves as trigger source of other oscilloscopes, the other oscilloscopes and the oscilloscope are in parallel connections respectively through coaxial cables to achieve synchronous trigger of all oscilloscopes; the oscilloscope is connected with a current transformer, total fault current can be measured by the current transformer when a short-circuit ground fault occurs; the other oscilloscopes all correspond to and connect with the current transformers, and ground current and transformer neutral point current can be measured by the corresponding current transformers when the short-circuit ground fault occurs. The device is used for synchronously measuring the short-circuit current distribution in the transformer substation when the short-circuit ground fault occurs. The invention simultaneously discloses a synchronous measurement method of the short-circuit current distribution in the transformer substation.
Description
Technical field
The present invention relates to high-voltage variable power station fields of measurement, specifically refer to a kind of apparatus and method of transformer station's internal short-circuit distribution of current being carried out synchro measure.
Background technology
During the earth fault that is short-circuited in the transformer station, the total failare electric current can be divided into earth current part, ground wire splitter section and transformer neutral point backflow part.Total failare electric current, earth current, ground wire shunting and transformer neutral point reflux, the size of these 4 magnitudes of current is called the distribution situation of short-circuit current, be called for short short-circuit current and distribute, as long as and obtained the wherein size of 3 amounts, just can try to achieve by Kirchhoff's law the size of the 4th amount.
The size of earth current directly affects station equipment and personal safety.This part electric current can produce the earth potential liter in transformer station, step voltage is poor and contact potential difference, causes some safety problems.Yet earth current is not to enter ground by single-pathway, but by the loose inflow place of earth mat.This has caused this part electric current directly not measure, and needs to come indirect calculation to obtain by measuring total failare electric current, ground wire partial current and transformer neutral point back flow current.
So the distribution situation of acquisition station internal fault electric current is the precondition that obtains earth current, it is the basis of investigating security feature in the station.
Current, the preparation method for transformer station's internal fault distribution of current mainly contains:
Based on on-the-spot artificial earthing's test
Obtain transformer station's internal fault current distributions, can carry out man-made short-circuit's earth test, then field measurement short trouble total current, ground line current and transformer neutral point electric current calculate earth current.The method basic ideas are: use artificial earthing device to produce the short circuit grounding fault in the station.
Use reometer or current transformer to measure short-circuit current, transformer neutral point electric current and ground line current, and use oscillograph recording.
According to each current measurement result, use short-circuit current to deduct transformer neutral point electric current and ground line current, obtain earth current.
The advantage of said method is that total data obtains by field measurement, and is direct and true.But there is following shortcoming: do not have unified time standard between each measuring amount, oscillograph triggers constantly disunity, the home record Time Inconsistency of each waveform, the measurement result that measures so generally can only be carried out the contrast of amplitude or effective value, can't carry out comparison of wave shape at the same time shaft; When going to calculate the earth current value with the magnitude of current that records like this, can only add and subtract with effective value or the amplitude of each magnitude of current, resultant error is larger.
Measurement and equivalent electrical circuit based on ground wire shunting impedance and substation grounding resistance, obtain transformer station's internal fault current distributions, can set up the divided circuit model of short-circuit current, measure the size of each several part shunting impedance, substitution divided circuit model, and then try to achieve the short-circuit current distribution situation.
Adopt the fall-of-potential method of recommending among standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential are measured the guide rule part 1: routine measurement " to measure substation grounding impedance Z g.
The disconnection ground wire is connected with substation ground network, uses current and voltage method to measure ground wire shunting impedance Zw.
If short-circuit current is I0, power transformation device neutral point current is IN, ground line current is Iw, earth current is Ig, then there is the distribution of current equivalent circuit diagram as follows, if known short-circuit current is that I0 and power transformation device neutral point current are IN, then can calculate ground line current and earth current by equivalent circuit diagram.
The advantage of said method has been to reduce the on-the-spot amount of current that needs actual measurement, has reduced the complexity of test.And for same transformer station, its equivalent electrical circuit is general, if provide total short-circuit current value and neutral point backflow value, only need utilize equivalent electrical circuit can try to achieve distribution of current, even remove the trouble of site test from.But there is following shortcoming in said method: each earth point does not access earth mat in same point, but is distributed in earth mat everywhere, so for distribution of current, it is a concentrated impedance that grounded screen has more than, there is error in the model equivalence of the method; The magnetic field that the line phase electric current produces can produce induced voltage at ground wire, and affect ground wire and shunt ability, be the impact that the method for a concentrated shunting impedance has been ignored phase line with the ground wire equivalence, can produce error; These model equivalences can be introduced many errors, and then can affect result's precision, compare with field measurement, and its inferior position is apparent in view.
As fully visible, in the existing transformer station internal fault distribution of current acquisition methods, the field measurement method is with respect to the method for using equivalent model, and is slightly better on result precision.But existing field measurement method has all been ignored the importance of synchro measure basically, and distribution of current is carried out the important guarantee that synchro measure is measurement result accuracy.Particularly further obtain the occasion of earth current waveform at needs, it is particularly important that the synchronism of each current waveform seems, because only have the result after the waveform that uses same start time added and subtracted to be only significant.For the accuracy of measurement result, and satisfy the requirement of further calculating earth current, need a kind of new current distribution measuring method that can guarantee to measure synchronism.
Therefore, instantly need a urgent technical matters that solves to be exactly: how can propose a kind of effective measures, the problem that exists to solve prior art.
Summary of the invention
One of purpose of the present invention provides a kind of device that transformer station's internal short-circuit distribution of current is carried out synchro measure, this device is used for short-circuit current when being short-circuited earth fault in the transformer station and distributes and carry out synchro measure, and simple in structure, easy to operate, reliable results.
Above-mentioned purpose of the present invention realizes by the following technical solutions: the device that transformer station's internal short-circuit distribution of current is carried out synchro measure, it is characterized in that: this device comprises many oscillographs, wherein oscillographic external trigger signal as other each oscillographic trigger source, other each oscillograph links to each other with this oscillograph respectively with parallel way by concentric cable, realize all many oscillographic synchronous triggerings, a described oscillograph links to each other with current transformer, total failare electric current when being short-circuited earth fault by the current transformer measurement, the equal correspondence of described other each oscillograph is connected with current transformer, the ground line current when being short-circuited earth fault by corresponding current transformer measurement and transformer neutral point electric current.
Among the present invention, described other each oscillograph comprises at least one oscillograph of the ground line current when being short-circuited earth fault for measurement and is used for measuring at least one oscillograph of the transformer neutral point electric current when being short-circuited earth fault.
Two of purpose of the present invention provides a kind of method of transformer station's internal short-circuit distribution of current being carried out synchro measure, and the method is used for short-circuit current when being short-circuited earth fault in the transformer station and distributes and carry out synchro measure, easy to operate, reliable results.
Above-mentioned purpose of the present invention realizes by the following technical solutions: transformer station's internal short-circuit distribution of current is carried out the method for synchro measure, the method comprises the steps:
Step S101: utilize an oscillographic external trigger signal as other each oscillographic trigger source, realize all many oscillographic synchronous triggerings, total failare electric current when a described oscillograph is short-circuited earth fault by the current transformer measurement, ground line current and transformer neutral point electric current when described other each oscillograph is short-circuited earth fault by corresponding current transformer measurement, thus transformer station's internal short-circuit distribution of current is carried out synchro measure.
Among the present invention, the method also comprises step S102: the current waveform that utilizes synchro measure to arrive, carry out the waveform plus-minus earth current when obtaining being short-circuited earth fault based on Kirchhoff's law.
Compared with prior art, apparatus and method of transformer station's internal short-circuit distribution of current being carried out synchro measure of the present invention, can be by utilizing oscillographic external trigger signal, the oscillograph of measuring the different magnitudes of current can be triggered simultaneously and begin wave recording, thus accurate, convenient and reliably obtain the synchro measure result of fault current distribution.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the present invention carries out the device of synchro measure to transformer station's internal short-circuit distribution of current connection diagram;
Fig. 2 is the present invention carries out the method for synchro measure to transformer station's internal short-circuit distribution of current process flow diagram.
Description of reference numerals
1,1# oscillograph; 2,2# oscillograph; 3,3# oscillograph; N, N# oscillograph;
Embodiment
As shown in Figure 1, a kind of device that transformer station's internal short-circuit distribution of current is carried out synchro measure, this device comprises many oscillograph 1# oscillographs 1,2 # oscillograph 2,3# oscillograph 3, N# oscillograph N, wherein the external trigger signal of an oscillograph 1# oscillograph 1 as other each oscillographic trigger source, other each oscillograph 2 # oscillograph 2,3# oscillograph 3, N# oscillograph N links to each other with this oscillograph respectively with parallel way by concentric cable, realize all many oscillographic synchronous triggerings, a described oscillograph 1# oscillograph 1 links to each other with the current transformer (not shown), total failare electric current when being short-circuited earth fault by the current transformer measurement, described other each oscillograph 2 # oscillograph 2,3# oscillograph 3, the equal correspondence of N# oscillograph N is connected with the current transformer (not shown), the ground line current when being short-circuited earth fault by corresponding current transformer measurement and transformer neutral point electric current.
Described other each oscillograph 2 # oscillograph 2,3# oscillograph 3 ..., N# oscillograph N comprises at least one oscillograph of the ground line current when being short-circuited earth fault for measurement and is used for measuring at least one oscillograph of the transformer neutral point electric current when being short-circuited earth fault, it is fixed that the oscillographic quantity of the ground line current when being short-circuited earth fault for measurement is come according to practical measurement requirement, and the oscillographic quantity of the transformer neutral point electric current when being short-circuited earth fault for measurement also is to decide according to practical measurement requirement.
An oscillograph 1# oscillograph 1 among the present invention is used for measuring the total failare electric current when being short-circuited earth fault, and uses a passage as the short circuit current measurement passage, and other oscillograph is then all vacated a passage, accesses measuring-signal since two passages.2 # oscillograph 2,3# oscillograph 3 ..., N# oscillograph N is used for respectively measuring ground line current and transformer neutral point electric current when being short-circuited earth fault, wherein, the oscillograph that is used for measuring the ground line current when being short-circuited earth fault can be one or more, and the oscillograph that is used for measuring the transformer neutral point electric current when being short-circuited earth fault also can be one or more.
The triggering mode of 1# oscillograph 1 is set to edging trigger, and trigger source is a passage, and single triggers.Use concentric cable with the external trigger signal of 1# oscillograph 1 be connected to other 2 # oscillograph 2,3# oscillograph 3 ..., N# oscillograph N a passage, other 2 # oscillograph 2,3# oscillograph 3 ..., N# oscillograph N the triggering mode setting be edging trigger, trigger source is a passage, and single triggers.
After short trouble occured, 1# oscillograph 1 was triggered and begins wave recording, send simultaneously the external trigger signal to other oscillograph 2 # oscillograph 2,3# oscillograph 3 ..., N# oscillograph N a passage, other oscillograph is triggered, and the beginning wave recording.
Consider the velocity of propagation of electric signal near the light velocity, and the short-circuit current dominant frequency is power frequency, so the travel-time of external trigger signal on stube cable is negligible with respect to each current waveform.Each oscillograph can be thought to trigger simultaneously like this, and the current waveform phase place of acquisition is identical, is analyzed on the axle at one time, and can obtains by the waveform plus-minus waveform of earth current.
As shown in Figure 2, a kind of method of transformer station's internal short-circuit distribution of current being carried out synchro measure, the method comprises the steps:
Step S101: utilize an oscillographic external trigger signal as other each oscillographic trigger source, realize all many oscillographic synchronous triggerings, total failare electric current when a described oscillograph is short-circuited earth fault by the current transformer measurement, ground line current and transformer neutral point electric current when described other each oscillograph is short-circuited earth fault by corresponding current transformer measurement, thus transformer station's internal short-circuit distribution of current is carried out synchro measure;
Step S102: the current waveform that utilizes synchro measure to arrive, carry out the waveform plus-minus earth current when obtaining being short-circuited earth fault based on Kirchhoff's law.
The method is utilized an oscillographic external trigger port, realizes measuring other each oscillographic synchronous triggering of each magnitude of current, thereby makes the current waveform of acquisition have identical phase relation.
Apparatus and method of the present invention are applicable to measure the short-circuit current that is short-circuited in the transformer station of all kinds of electric pressures after the earth fault and distribute, and can realize the synchro measure of each magnitude of current, and this is that general measurement mechanism and method institute is inaccessible.And by each current waveform that synchro measure obtains, its home record point is consistent, compares on the axle at one time, also can obtain by the waveform plus-minus waveform of earth current, and this also is that other measuring method is not accomplished.Simultaneously, field measurement has guaranteed result's accuracy, and test connection is simple.Measuring method is accurate, convenient, reliable.
The above embodiment of the present invention is not the restriction to protection domain of the present invention; embodiments of the present invention are not limited to this; all this kind is according to foregoing of the present invention; ordinary skill knowledge and customary means according to this area; do not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite; modification, replacement or the change of other various ways that said structure of the present invention is made all should drop within protection scope of the present invention.
Claims (4)
1. transformer station's internal short-circuit distribution of current is carried out the device of synchro measure, it is characterized in that: this device comprises many oscillographs, wherein oscillographic external trigger signal as other each oscillographic trigger source, other each oscillograph links to each other with this oscillograph respectively with parallel way by concentric cable, realize all many oscillographic synchronous triggerings, a described oscillograph links to each other with current transformer, total failare electric current when being short-circuited earth fault by the current transformer measurement, the equal correspondence of described other each oscillograph is connected with current transformer, the ground line current when being short-circuited earth fault by corresponding current transformer measurement and transformer neutral point electric current.
2. the device that transformer station's internal short-circuit distribution of current is carried out synchro measure according to claim 1 is characterized in that: described other each oscillograph comprises at least one oscillograph of the ground line current when being short-circuited earth fault for measurement and is used for measuring at least one oscillograph of the transformer neutral point electric current when being short-circuited earth fault.
3. transformer station's internal short-circuit distribution of current is carried out the method for synchro measure, the method comprises the steps:
Step S101: utilize an oscillographic external trigger signal as other each oscillographic trigger source, realize all many oscillographic synchronous triggerings, total failare electric current when a described oscillograph is short-circuited earth fault by the current transformer measurement, ground line current and transformer neutral point electric current when described other each oscillograph is short-circuited earth fault by corresponding current transformer measurement, thus transformer station's internal short-circuit distribution of current is carried out synchro measure.
4. method of transformer station's internal short-circuit distribution of current being carried out synchro measure according to claim 3, it is characterized in that: the method also comprises step S102: the current waveform that utilizes synchro measure to arrive, carry out the waveform plus-minus earth current when obtaining being short-circuited earth fault based on Kirchhoff's law.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104600657A (en) * | 2015-01-30 | 2015-05-06 | 国网北京经济技术研究院 | Power system fault calculation result calibration method |
| CN105277773A (en) * | 2015-10-08 | 2016-01-27 | 国网天津市电力公司 | Method for completely calculating grounding short-circuit current of transformation station |
| CN105699788A (en) * | 2016-04-27 | 2016-06-22 | 浪潮电子信息产业股份有限公司 | Power supply time sequence measurement method, oscilloscope and system thereof |
| CN106950456A (en) * | 2017-05-26 | 2017-07-14 | 云南电网有限责任公司电力科学研究院 | A kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit |
| CN107132455A (en) * | 2017-05-26 | 2017-09-05 | 云南电网有限责任公司电力科学研究院 | A kind of grounding net of transformer substation performance estimating method injected based on ground line current |
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| CN203025236U (en) * | 2012-11-29 | 2013-06-26 | 广东电网公司电力科学研究院 | Device for synchronously measuring short circuit current distribution in transformer station |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600657A (en) * | 2015-01-30 | 2015-05-06 | 国网北京经济技术研究院 | Power system fault calculation result calibration method |
| CN105277773A (en) * | 2015-10-08 | 2016-01-27 | 国网天津市电力公司 | Method for completely calculating grounding short-circuit current of transformation station |
| CN105699788A (en) * | 2016-04-27 | 2016-06-22 | 浪潮电子信息产业股份有限公司 | Power supply time sequence measurement method, oscilloscope and system thereof |
| CN106950456A (en) * | 2017-05-26 | 2017-07-14 | 云南电网有限责任公司电力科学研究院 | A kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit |
| CN107132455A (en) * | 2017-05-26 | 2017-09-05 | 云南电网有限责任公司电力科学研究院 | A kind of grounding net of transformer substation performance estimating method injected based on ground line current |
| CN107132455B (en) * | 2017-05-26 | 2019-07-05 | 云南电网有限责任公司电力科学研究院 | A kind of grounding net of transformer substation performance estimating method based on ground line current injection |
| CN106950456B (en) * | 2017-05-26 | 2019-07-26 | 云南电网有限责任公司电力科学研究院 | A kind of grounding net of transformer substation performance estimating method based on man-made short-circuit's experiment |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Patentee after: Tsinghua University Address before: 510080 Dongfeng East Road, Guangdong, Guangzhou, water, Kong Kong, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation Patentee before: Tsinghua University |
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Effective date of registration: 20200715 Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee before: TSINGHUA University Patentee before: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. |