CN101782638B - Calibration device and method capable of measuring multiple current transformers once - Google Patents
Calibration device and method capable of measuring multiple current transformers once Download PDFInfo
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- CN101782638B CN101782638B CN 200910001251 CN200910001251A CN101782638B CN 101782638 B CN101782638 B CN 101782638B CN 200910001251 CN200910001251 CN 200910001251 CN 200910001251 A CN200910001251 A CN 200910001251A CN 101782638 B CN101782638 B CN 101782638B
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Abstract
The invention provides a calibration device and method capable of measuring multiple current transformers once. The device comprises a current raising device, a transformer calibrator, a microprocessor, a load box, a demagnetizing resistor, a switching control circuit and a plurality of switchgears, wherein the switchgears are connected on the secondary side of each transformer to be measured in parallel and are controlled by the microprocessor to ensure that the rest current transformers are in short-circuit states when a certain current transformer is measured; when the microprocessor controls the current raising device to raise current to the first regulation point, N-numbered transformers are measured in sequence, then after the current raising device raises current to the second regulation point and N-numbered transformers are measured in sequence, the current is pointwise raised to the specified final regulation point and then the current pointwise drops to zero, and N-numbered transformers are measured in the rising and dropping processes of each regulation point. By the device and the working method, the working efficiency is obviously improved, the used time is 1/10 of that in the traditional device and working method and the manpower resources are saved.
Description
Technical field
The present invention relates to a kind of calibration equipment and method of mutual inductor, particularly a kind of calibration equipment and method of once surveying many current transformers.
Background technology
A large amount of current transformers will be produced and use to the power high voltage metering field all every year, mutual-inductor calibration device be for detection of with the exact instrument of measuring transformer error, therefore, the mutual inductor verifying attachment is one of indispensable important support equipment of development electric utility.
patent 02278848.4 test platform for mutual inductor is a kind of test platform for mutual inductor for the electric system transducer check, by special-purpose stage body, from the up-flow standard mutual inductor, primary side A.C. contactor commutation circuit, secondary side relay switch circuit, mutual inductor is measured and the demagnetizing resistance commutation circuit, the switching controls driving circuit, two thread depressing mechanisms, nixie display forms, adopted many groups A.C. contactor and relay and standard mutual inductor and a plurality of tested mutual inductor to connect, but automatic or manual is completed no-load voltage ratio and is switched, tested mutual inductor switches and demagnetizing resistance switches, have and once survey many mutual inductor functions, wiring and measurement procedure are as depicted in figs. 1 and 2, K with tester when surveying First terminates on First, the second short circuit of all the other mutual inductors, then according to a plurality of test points of stipulating in rules, measure after the fixed point one by one, to be connected on the second platform at transfer relay under no-voltage, current conditions when surveying second, all the other mutual inductor short circuits.By that analogy, just the data of many mutual inductors can be read successively, realize the calibrating successively of many mutual inductors.
Probably need 30～60 minutes during 12 of traditional approach calibratings position mutual inductor, although original single surveying work efficient is significantly improved, but for actual verifying work, due to the continuous increase-volume enlarging of electric system, secondary metering device sharply increased in recent years, but the present personnel that are engaged in verifying work are not increased accordingly, and workload is per capita constantly increasing, so the work efficiency of Transformer Calibrator is suddenly treated further raising.
Summary of the invention
Fundamental purpose of the present invention is the defective that overcomes above-mentioned prior art, and a kind of calibration equipment and method of once surveying many current transformers is provided, and it can complete the measurement of many mutual inductors after once fixing a point, work efficiency is significantly improved.
in order to achieve the above object, the invention provides a kind of calibration equipment of once surveying many current transformers, it comprises: current lifting device, mutual-inductor tester, microprocessor, Burden box, demagnetizing resistance, control switching circuit and a plurality of switchgear, wherein, described microprocessor connects described current lifting device, described mutual-inductor tester and described control switching circuit, described mutual-inductor tester connects described Burden box and described control switching circuit, described demagnetizing resistance connects described control switching circuit and described Burden box, described switchgear is connected in parallel on the secondary side of each tested mutual inductor, controlled by described microprocessor, when guaranteeing to measure for a certain current transformer, all the other current transformers are in short-circuit condition.
Wherein, described control switching circuit is two relays, and described switchgear is relay.
Wherein, described Burden box can be simulation load box.
In order to achieve the above object, the present invention also provides a kind of method of calibration of once surveying many current transformers, and the method realizes by following steps:
Step 1: up-flow is to first rules point;
Step 2: measure successively all N mutual inductor, and described mutual inductor is carried out checking treatment;
Step 3: judge whether to test all rules points, if do not have, up-flow is carried out above-mentioned steps 2 to next default rules point; Otherwise carry out following step 4;
Step 4: after having surveyed last rules point, fall successively and flow to described first rules point, in falling the process of stream, each rules point is measured described all N mutual inductor successively;
Step 5: rising value and the drop-out value of each rules point measurement are averaged, obtain last measured value;
Step 6: electric current returns zero;
Step 7: finish;
Wherein, N is more than or equal to 2.
Compared with prior art beneficial effect of the present invention is: this kind device significantly improves work efficiency, and the used time is that tradition is consuming time 1/10, and in addition, this device ensures under electric current pilot relay and switches and can not cause current transformer to damage because of second open circuit.
Description of drawings
Fig. 1 is that prior art is measured external line chart;
Fig. 2 is the measurement procedure figure that prior art is once surveyed many mutual inductors;
Fig. 3 is external line chart of the present invention;
Fig. 4 is the measurement procedure figure that the present invention once surveys many mutual inductors;
Fig. 5 is the charged handover measurement transformer circuit of the present invention constitutional diagram A;
Fig. 6 is the charged handover measurement transformer circuit of the present invention constitutional diagram B;
Fig. 7 is the charged handover measurement transformer circuit of the present invention constitutional diagram C.
Embodiment
Below in conjunction with accompanying drawing, technical characterictic and the advantage above-mentioned and other to the present invention are described in more detail.
see also Fig. 3, external line chart for the present invention's measurement, it comprises current lifting device, mutual-inductor tester, microprocessor, Burden box, demagnetizing resistance and control switching circuit, at each tested mutual inductor secondary side also and connect a switchgear, described switchgear can be a relay, described control switching circuit is comprised of two relays, described microprocessor is controlled current lifting device, can make current lifting device be raised to a default fixed point, microprocessor is also controlled control switching circuit and the switchgear that is connected with secondary terminals, tested mutual inductor is connected with standard mutual inductor respectively, described mutual-inductor tester connects microprocessor, standard mutual inductor, one end of control switching circuit and Burden box, the other end of Burden box connects an end of tested mutual inductor and an end of demagnetizing resistance, the other end of described demagnetizing resistance connects control switching circuit.
Above-mentioned control switching circuit is by relay J 11, J12 ..., JN1, JN2 form, and the relay that is connected with tested mutual inductor is J13......JN3.Above-mentioned Burden box can be simulation load box.
Then, see also Fig. 4, once survey the measurement procedure figure of many transducer check methods for the present invention, the invention provides a kind of method of calibration of once surveying many current transformers, the method realizes by following steps:
Step 1: up-flow is to first rules point;
Step 2: measure successively all N mutual inductor, and described mutual inductor is carried out checking treatment;
Step 3: judge whether to test all rules points, if do not have, up-flow is carried out above-mentioned steps 2 to next default rules point; Otherwise carry out following step 4;
Step 4: after having surveyed last rules point, fall successively and flow to described first rules point, in falling the process of stream, each rules point is measured described all N mutual inductor successively;
Step 5: rising value and the drop-out value of each rules point measurement are averaged, obtain last measured value;
Step 6: electric current returns zero;
Step 7: finish;
Wherein, N is more than or equal to 2.
Then, see also Fig. 5, be the charged handover measurement transformer circuit of the present invention constitutional diagram A, microprocessor is controlled current lifting device and is raised to first rules point, described first rules point is 5% of the specified output valve of mutual inductor secondary current, after one termination of the common port of relay J 11 and standard mutual inductor was logical, the contact of relay J 13 disconnected, and mutual-inductor tester begins tested mutual inductor 1 is carried out the error measure of 5% rules point.
See also Fig. 5 and Fig. 6, be the charged handover measurement transformer circuit of the present invention constitutional diagram B, C, after 5% rules point measurement is complete, at first with the closing of contact of J13, then, the common port of relay J 11 is communicated with the common port of J12, and the common port of the J21 of relay is communicated with an end of standard mutual inductor, the contact of pilot relay J23 disconnects again, the error measure process that then enters 5% rules point of tested mutual inductor 2.Same said process circulation N time has namely been surveyed at 5% rules N the transformer error of naming a person for a particular job.
name a person for a particular job after N transformer error surveyed when 5% rules, microprocessor is controlled the current lifting device up-flow to second rules point of mutual inductor, and described second rules point is 20% of mutual inductor secondary current ratings, second rules point at mutual inductor is complete N mutual inductor measuring, then, the pointwise up-flow, until up-flow is to mutual inductor secondary current ratings 100% and 120%, each above-mentioned rules point all repeats the rising value process of an above-mentioned measurement N mutual inductor, fall from 120% of mutual inductor secondary current ratings again and flow to 5% of mutual inductor secondary current ratings, in the decline process, repeat the drop-out value process of an above-mentioned measurement N mutual inductor in the equal pointwise of each rules point, mutual-inductor tester averages rising value and the drop-out value of each rules point, obtain last measured value, then electric current returns zero, measure and finish.
The device of many mutual inductors of this charged primary side is after once fixing a point, can complete the measurement of many mutual inductors, if measure 12 mutual inductors, whole Measuring Time is 10 seconds, 7 fixed point time adds that 7 Measuring Time after fixed point complete 12 mutual inductor rules and measure required times and be less than 3 minutes, the used time be tradition consuming time 1/10.In addition, this device ensures under current conditions, and the pilot relay switching can not cause current transformer to damage because of second open circuit.
Above explanation is just illustrative for the purpose of the present invention, and nonrestrictive, and those of ordinary skills understand; in the situation that do not break away from the spirit and scope that following claims limit, can make many modifications, change; or equivalence, but all will fall within the scope of protection of the present invention.
Claims (1)
1. method of calibration of once surveying the calibration equipment of many current transformers, described calibration equipment comprises: current lifting device, mutual-inductor tester, microprocessor, Burden box, demagnetizing resistance, control switching circuit and a plurality of switchgear, wherein, described microprocessor connects described current lifting device, described mutual-inductor tester and described control switching circuit, described mutual-inductor tester connects described Burden box and described control switching circuit, described demagnetizing resistance connects described control switching circuit and described Burden box, described switchgear is connected in parallel on the secondary side of each tested mutual inductor, controlled by described microprocessor, when guaranteeing to measure for a certain current transformer, all the other current transformers are in short-circuit condition, described control switching circuit is comprised of two relays, described switchgear is a relay, described Burden box is simulation load box,
It is characterized in that, this method of calibration realizes by following steps:
Step 1: up-flow is to first rules point;
Step 2: measure successively all N mutual inductor, and described mutual inductor is carried out checking treatment;
Step 3: judge whether to test all rules points, if do not have, up-flow is carried out above-mentioned steps 2 to next default rules point; Otherwise carry out following step 4;
Step 4: after having surveyed last rules point, fall successively and flow to described first rules point, in falling the process of stream, each rules point is measured described all N mutual inductor successively;
Step 5: rising value and the drop-out value of each rules point measurement are averaged, obtain last measured value;
Step 6: electric current returns zero;
Step 7: finish;
Wherein, N is more than or equal to 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910001251 CN101782638B (en) | 2009-01-16 | 2009-01-16 | Calibration device and method capable of measuring multiple current transformers once |
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| CN 200910001251 CN101782638B (en) | 2009-01-16 | 2009-01-16 | Calibration device and method capable of measuring multiple current transformers once |
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| CN101782638A CN101782638A (en) | 2010-07-21 |
| CN101782638B true CN101782638B (en) | 2013-06-26 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305919B (en) * | 2011-05-25 | 2013-11-06 | 国网电力科学研究院武汉南瑞有限责任公司 | Calibration device and method capable of synchronously measuring multiple voltage transformers at one time |
| CN102253356A (en) * | 2011-06-24 | 2011-11-23 | 四川省电力公司绵阳电业局 | Measuring method of current transformer transformation ratio |
| CN102901848A (en) * | 2012-10-23 | 2013-01-30 | 四川省电力公司攀枝花电业局 | Terminal box for connecting secondary winding of current transformer and test instrument |
| CN103293508B (en) * | 2013-05-30 | 2016-05-18 | 国家电网公司 | Current transformer calibration equipment |
| CN108896950B (en) * | 2018-07-18 | 2020-01-07 | 国网四川省电力公司电力科学研究院 | Automatic switching device for verifying secondary wiring of program-controlled three-phase combined transformer |
| US10958062B2 (en) * | 2018-11-13 | 2021-03-23 | Rockwell Automation Technologies, Inc. | Systems and methods for dynamically switching a load of a current transformer circuit |
| CN109407036B (en) * | 2018-12-29 | 2023-12-15 | 太原山互科技有限公司 | Full-automatic calibrating device of batch current transformer based on PLC control |
| CN111487576B (en) * | 2020-04-30 | 2022-12-30 | 浙江省计量科学研究院 | Miniature current transformer measuring device based on direct measurement method |
| CN111722172A (en) * | 2020-06-16 | 2020-09-29 | 浙江工业职业技术学院 | Novel alternating current transformer online detection device and method |
| CN111693925B (en) * | 2020-07-20 | 2023-01-03 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
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| CN2572416Y (en) * | 2002-08-20 | 2003-09-10 | 武汉华电国电高压科技发展有限公司 | Test platform for mutual inductor |
| CN2574066Y (en) * | 2002-09-28 | 2003-09-17 | 武汉华电国电高压科技发展有限公司 | In-situ mutual inductor checking device |
| CN201045626Y (en) * | 2007-07-27 | 2008-04-09 | 宁波三维电测设备有限公司 | Full electronic source type mutual inductor rapid testing apparatus |
| CN201145737Y (en) * | 2008-01-04 | 2008-11-05 | 宁波三维电测设备有限公司 | Apparatus for measuring error of current transformer based on parameter measurement |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2572416Y (en) * | 2002-08-20 | 2003-09-10 | 武汉华电国电高压科技发展有限公司 | Test platform for mutual inductor |
| CN2574066Y (en) * | 2002-09-28 | 2003-09-17 | 武汉华电国电高压科技发展有限公司 | In-situ mutual inductor checking device |
| CN201045626Y (en) * | 2007-07-27 | 2008-04-09 | 宁波三维电测设备有限公司 | Full electronic source type mutual inductor rapid testing apparatus |
| CN201145737Y (en) * | 2008-01-04 | 2008-11-05 | 宁波三维电测设备有限公司 | Apparatus for measuring error of current transformer based on parameter measurement |
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