CN103018525B - Transformer station's internal short-circuit distribution of current is carried out to the apparatus and method of synchro measure - Google Patents
Transformer station's internal short-circuit distribution of current is carried out to the apparatus and method of synchro measure Download PDFInfo
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- CN103018525B CN103018525B CN201210510304.3A CN201210510304A CN103018525B CN 103018525 B CN103018525 B CN 103018525B CN 201210510304 A CN201210510304 A CN 201210510304A CN 103018525 B CN103018525 B CN 103018525B
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Abstract
The invention discloses the apparatus and method of transformer station's internal short-circuit distribution of current being carried out to synchro measure, this device comprises multiple stage oscillograph, wherein an oscillographic external trigger signal is as other each oscillographic trigger source, other each oscillograph is connected with this oscillograph with parallel way respectively by concentric cable, realize the oscillographic synchronous triggering of all multiple stage, a described oscillograph is connected with current transformer, total failare electric current when being short-circuited earth fault is measured by current transformer, other described each equal correspondence of oscillograph is connected with current transformer, ground line current when being short-circuited earth fault and transformer neutral point electric current is measured by corresponding current transformer.This device be used for be short-circuited in transformer station earth fault time short-circuit current distribution carry out synchro measure.The present invention discloses the method for transformer station's internal short-circuit distribution of current being carried out to synchro measure.
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 to synchro measure.
Background technology
During the earth fault that is short-circuited in transformer station, total failare electric current can be divided into earth current part, ground wire splitter section and transformer neutral point refluxing portion.The shunting of total failare electric current, earth current, ground wire and transformer neutral point backflow, the size of these 4 magnitudes of current is called the distribution situation of short-circuit current, be called for short short-circuit current distribution, as long as and obtain wherein 3 amount sizes, just by Kirchhoff's law try to achieve the 4th amount size.
The size of earth current, directly affects station equipment and personal safety.This portion of electrical current can produce earth potential liter, step potential difference and contact potential difference in transformer station, causes some safety problems.But earth current is not enter ground by single-pathway, but enters ground by earth mat diffusing.Which results in this part electric current directly to measure and obtain, and indirect calculation need be carried out 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 obtaining earth current, it is the basis investigating security feature in station.
Current, for the preparation method of transformer station's internal fault distribution of current, mainly contain:
Test based on on-the-spot artificial earthing
Obtain transformer station's internal fault current distributions, can carry out man-made short-circuit's earth test, field measurement short trouble total current, ground line current and transformer neutral point electric current, then calculate earth current.The method basic ideas are: use artificial earthing device to produce short circuit grounding fault in 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, direct and true.But there is following shortcoming: between each measuring amount, there is no unified time standard, oscillograph trigger instants disunity, the home record Time Inconsistency of each waveform, the measurement result that such measurement obtains generally can only carry out amplitude or effective value contrast, cannot carry out comparison of wave shape on same time shaft; When going to calculate earth current value with the magnitude of current recorded like this, can only add and subtract with the effective value of each magnitude of current or amplitude, resultant error is larger.
Based on measurement and the equivalent electrical circuit of ground wire shunting impedance and substation grounding resistance, obtain transformer station's internal fault current distributions, the divided circuit model of short-circuit current can be set up, measure the size obtaining each several part shunting impedance, substitute into divided circuit model, and then try to achieve short-circuit current distribution situation.
The fall-of-potential method recommended in standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential measure directive/guide part 1: routine measurement " is adopted to measure substation grounding impedance Z g.
Disconnect the connection of ground wire and substation ground network, use 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 distribution of current equivalent circuit diagram as follows, if known short-circuit current is I0 and power transformation device neutral point current is IN, then can calculate ground line current and earth current by equivalent circuit diagram.
The advantage of said method resides in reduced the on-the-spot amount of current needing actual measurement, reduces 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 equivalent electrical circuit need be utilized to try to achieve distribution of current, even eliminate the trouble of site test.But there is following shortcoming in said method: each earth point not at same point access earth mat, but is distributed in earth mat everywhere, so for distribution of current, it is a concentrated impedance that grounded screen has more than, and the model equivalence of the method exists error; The magnetic field that line phase electric current produces can produce induced voltage on ground wire, and affect ground wire separation capacity, method ground wire being equivalent to a concentrated shunting impedance have ignored the impact of phase line, can produce error; These model equivalences can introduce many errors, and then can affect the precision of result, and compared with field measurement, its inferior position is obvious.
As fully visible, in existing transformer station internal fault distribution of current acquisition methods, field measurement method is relative to the method using equivalent model, slightly better on result precision.But existing field measurement method all have ignored the importance of synchro measure substantially, and carries out to distribution of current the important guarantee that synchro measure is measurement result accuracy.Particularly needing the occasion obtaining earth current waveform further, the synchronism of each current waveform seems particularly important, because only have the result after adding and subtracting the waveform of the same start time of use to be only significant.In order to the accuracy of measurement result, and meet the requirement calculating earth current further, need a kind of current distribution measuring method that can ensure to measure synchronism newly.
Therefore, the urgent technical matters solved instantly is needed exactly: how can propose a kind of effective measures, to solve prior art Problems existing.
Summary of the invention
An object of the present invention is to provide a kind of device transformer station's internal short-circuit distribution of current being carried out to synchro measure, this device be used for be short-circuited in transformer station earth fault time short-circuit current distribution carry out synchro measure, and structure is simple, easy to operate, reliable results.
Above-mentioned purpose of the present invention realizes by the following technical solutions: device transformer station's internal short-circuit distribution of current being carried out to synchro measure, it is characterized in that: this device comprises multiple stage oscillograph, wherein an oscillographic external trigger signal is as other each oscillographic trigger source, other each oscillograph is connected with this oscillograph with parallel way respectively by concentric cable, realize the oscillographic synchronous triggering of all multiple stage, a described oscillograph is connected with current transformer, total failare electric current when being short-circuited earth fault is measured by current transformer, other described each equal correspondence of oscillograph is connected with current transformer, ground line current when being short-circuited earth fault and transformer neutral point electric current is measured by corresponding current transformer.
In the present invention, other described each oscillograph comprises at least one the oscillograph for measuring ground line current when being short-circuited earth fault and at least one the oscillograph for measuring transformer neutral point electric current when being short-circuited earth fault.
Two of object of the present invention is to provide a kind of method of transformer station's internal short-circuit distribution of current being carried out to synchro measure, the method be used for be short-circuited in transformer station earth fault time short-circuit current distribution carry out synchro measure, easy to operate, reliable results.
Above-mentioned purpose of the present invention realizes by the following technical solutions: the method for transformer station's internal short-circuit distribution of current being carried out to synchro measure, the method comprises the steps:
Step S101: utilize an oscillographic external trigger signal as other each oscillographic trigger source, realize the oscillographic synchronous triggering of all multiple stage, a described oscillograph measures total failare electric current when being short-circuited earth fault by current transformer, other described each oscillograph measures ground line current when being short-circuited earth fault and transformer neutral point electric current by corresponding current transformer, thus carries out synchro measure to transformer station's internal short-circuit distribution of current.
In the present invention, the method also comprises step S102: utilize the current waveform that synchro measure arrives, and carries out waveform add and subtract the earth current obtained when 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 to synchro measure of the present invention, can by utilizing oscillographic external trigger signal, make the oscillograph of the different magnitude of current of measurement trigger simultaneously and to start wave recording, thus accurately, the synchro measure result of convenient and reliable acquisition fault current distribution.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is that the present invention carries out the connection diagram of the device of synchro measure to transformer station's internal short-circuit distribution of current;
Fig. 2 is that the present invention carries out the process flow diagram of the method for synchro measure to transformer station's internal short-circuit distribution of current.
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 transformer station's internal short-circuit distribution of current being carried out to synchro measure, this device comprises multiple stage oscillograph 1# oscillograph 1, 2# oscillograph 2, 3# oscillograph 3, N# oscillograph N, wherein the external trigger signal of an oscillograph 1# oscillograph 1 is as other each oscillographic trigger source, other each oscillograph 2# oscillograph 2, 3# oscillograph 3, N# oscillograph N is connected with this oscillograph with parallel way respectively by concentric cable, realize the oscillographic synchronous triggering of all multiple stage, a described oscillograph 1# oscillograph 1 is connected with current transformer (not shown), total failare electric current when being short-circuited earth fault is measured by current transformer, other described each oscillograph 2# oscillograph 2, 3# oscillograph 3, the equal correspondence of N# oscillograph N is connected with current transformer (not shown), ground line current when being short-circuited earth fault and transformer neutral point electric current is measured by corresponding current transformer.
Other described each oscillograph 2# oscillograph 2,3# oscillograph 3 ..., N# oscillograph N comprises at least one the oscillograph for measuring ground line current when being short-circuited earth fault and at least one the oscillograph for measuring transformer neutral point electric current when being short-circuited earth fault, oscillographic quantity for measuring ground line current when being short-circuited earth fault is determined according to practical measurement requirement, is also determine according to practical measurement requirement for measuring the oscillographic quantity of transformer neutral point electric current when being short-circuited earth fault.
An oscillograph 1# oscillograph 1 in the present invention is used for the total failare electric current measured when being short-circuited earth fault, and uses a passage as short circuit current measurement passage, and a passage is then all vacated by other oscillograph, from two passages, access measuring-signal.2# oscillograph 2,3# oscillograph 3 ..., N# oscillograph N is used for measuring ground line current when being short-circuited earth fault and transformer neutral point electric current respectively, wherein, be used for the ground line current measured when being short-circuited earth fault oscillograph can for one or more, be used for the transformer neutral point electric current measured when being short-circuited earth fault oscillograph also can for 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 the external trigger signal of 1# oscillograph 1 is connected to other 2# oscillograph 2,3# oscillograph 3 ..., N# oscillograph N a passage, other 2# oscillograph 2,3# oscillograph 3 ..., N# oscillograph N triggering mode arrange be edging trigger, trigger source is a passage, and single triggers.
Short trouble occur after, 1# oscillograph 1 is triggered and starts wave recording, send simultaneously external trigger signal to other oscillograph 2# oscillograph 2,3# oscillograph 3 ..., N# oscillograph N a passage, other oscillograph is triggered, and starts wave recording.
Consider that the velocity of propagation of electric signal is close to the light velocity, and short-circuit current dominant frequency is power frequency, so the travel-time of external trigger signal on stube cable is negligible relative to each current waveform.Each like this oscillograph can be thought to trigger simultaneously, and the current waveform phase place of acquisition is identical, at one time axle can be analyzed, and obtain the waveform of earth current by waveform plus-minus.
As shown in Figure 2, a kind of method of transformer station's internal short-circuit distribution of current being carried out to synchro measure, the method comprises the steps:
Step S101: utilize an oscillographic external trigger signal as other each oscillographic trigger source, realize the oscillographic synchronous triggering of all multiple stage, a described oscillograph measures total failare electric current when being short-circuited earth fault by current transformer, other described each oscillograph measures ground line current when being short-circuited earth fault and transformer neutral point electric current by corresponding current transformer, thus carries out synchro measure to transformer station's internal short-circuit distribution of current;
Step S102: utilize the current waveform that synchro measure arrives, carries out waveform based on Kirchhoff's law and adds and subtracts the earth current obtained when being short-circuited earth fault.
The method utilizes an oscillographic external trigger port, realizes other each the oscillographic synchronous triggering of measuring each magnitude of current, thus makes the current waveform of acquisition have identical phase relation.
Apparatus and method of the present invention, the short-circuit current distribution after the earth fault that is short-circuited in the transformer station being applicable to measure all kinds of electric pressure, can realize the synchro measure of each magnitude of current, this is that general measurement mechanism and method do not reach.And each current waveform obtained by synchro measure, its home record point is consistent, and can at one time axle contrast, also obtain the waveform of earth current by waveform plus-minus, this is also that other measuring method is not accomplished.Meanwhile, field measurement ensure that the accuracy of result, and test connection is simple.Measuring method is accurate, convenient, reliable.
The above embodiment of the present invention is not limiting the scope of the present invention; embodiments of the present invention are not limited thereto; all this kind is according to foregoing of the present invention; according to ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; to the amendment of other various ways that said structure of the present invention is made, replacement or change, all should drop within protection scope of the present invention.
Claims (2)
1. pair transformer station's internal short-circuit distribution of current carries out the device of synchro measure, it is characterized in that: this device comprises multiple stage oscillograph, wherein an oscillographic external trigger signal is as other each oscillographic trigger source, other each oscillograph is connected with this oscillograph with parallel way respectively by concentric cable, realize the oscillographic synchronous triggering of all multiple stage, a described oscillograph is connected with current transformer, total failare electric current when being short-circuited earth fault is measured by current transformer, other described each equal correspondence of oscillograph is connected with current transformer, ground line current when being short-circuited earth fault and transformer neutral point electric current is measured by corresponding current transformer, other described each oscillograph comprises at least one the oscillograph for measuring ground line current when being short-circuited earth fault and at least one the oscillograph for measuring transformer neutral point electric current when being short-circuited earth fault.
2. pair transformer station's internal short-circuit distribution of current carries out the method for synchro measure, and the method comprises the steps:
Step S101: utilize an oscillographic external trigger signal as other each oscillographic trigger source, realize the oscillographic synchronous triggering of all multiple stage, a described oscillograph measures total failare electric current when being short-circuited earth fault by current transformer, other described each oscillograph measures ground line current when being short-circuited earth fault and transformer neutral point electric current by corresponding current transformer, thus carries out synchro measure to transformer station's internal short-circuit distribution of current;
Step S102: utilize the current waveform that synchro measure arrives, carries out waveform based on Kirchhoff's law and adds and subtracts the earth current obtained when being short-circuited earth fault.
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| CN104600657B (en) * | 2015-01-30 | 2018-03-06 | 国网北京经济技术研究院 | A kind of method of calibration of electric power system fault result of calculation |
| 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 |
| 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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| JP2002354655A (en) * | 2001-05-23 | 2002-12-06 | Hitachi Ltd | Ground fault detecting method and apparatus therefor |
| CN102221644A (en) * | 2011-03-15 | 2011-10-19 | 珠海威瀚科技发展有限公司 | System and method for online monitoring grounding networks of power stations and substations |
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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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Patent Citations (4)
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| JP2002354655A (en) * | 2001-05-23 | 2002-12-06 | Hitachi Ltd | Ground fault detecting method and apparatus therefor |
| CN102221644A (en) * | 2011-03-15 | 2011-10-19 | 珠海威瀚科技发展有限公司 | System and method for online monitoring grounding networks of power stations and substations |
| CN202548225U (en) * | 2012-02-13 | 2012-11-21 | 西安爱邦电子系统有限公司 | Four-channel oscillographic alternating current component recorder |
| 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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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. |
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