CN101545963A - High-performance current transformer intelligent analyzer - Google Patents
High-performance current transformer intelligent analyzer Download PDFInfo
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- CN101545963A CN101545963A CN200810024473A CN200810024473A CN101545963A CN 101545963 A CN101545963 A CN 101545963A CN 200810024473 A CN200810024473 A CN 200810024473A CN 200810024473 A CN200810024473 A CN 200810024473A CN 101545963 A CN101545963 A CN 101545963A
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- 238000012360 testing method Methods 0.000 claims abstract description 82
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 4
- 241001269238 Data Species 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 abstract description 15
- 230000008859 change Effects 0.000 abstract description 2
- 238000004804 winding Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 238000010998 test method Methods 0.000 description 4
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012353 t test Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 239000012467 final product Substances 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
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Abstract
The invention relates to a high-performance current transformer intelligent analyzer, which is applied to a saturation characteristic test for a transient state current transformer, direct tests for a sleeve current transformer and a current transformer in GIS and all parameter tests for all conventional transformers, and belongs to the technical field of current transformer test instruments. During voltage current characteristic tests for the transient state current transformer and a conventional high saturation characteristic transformer, because only the output frequency needs to be changed during the tests, the intelligent analyzer can perform the test on the transient state current transformer of which the saturation voltage is 15,000 kilovolts when the maximum amplitude value is 120 volts, and change the blank that at present no domestic equipment performs test on a transient sate winding; besides, the instrument output test voltage is low, which cannot cause potential safety hazards to the equipment and the personal safety; and because a booster transformer (generally, the weight of a transformer is tens of kilograms) for boosting is not needed, the weight of equipment to be tested is greatly reduced.
Description
Technical field
The present invention relates to a kind of high-performance current transformer intelligent analyzer, be used for the direct test of the interior current transformer of test, casing current transformer and GIS of transient current transformer saturation characteristic, whole parameter testings of all conventional mutual inductors belong to current transformer testing tool technical field.
Background technology
The main test event of current transformer is the test of current transformer volt-ampere characteristic summation current transformer no-load voltage ratio, for satisfying the technical requirement of above-mentioned test event, existing testing tool mainly is made up of Single-chip Controlling part, voltage amplifier, current amplifier, stepup transformer, current lifting device, measurement loop, man-machine conversation and printer.Single-chip Controlling partly is responsible for the measurement evaluation work of control output voltage electric current and analog quantity; Amplifier output 0-100V alternating voltage and 0-5A alternating current; Stepup transformer boosts to 500V or 800V with 0-100V alternating voltage; Current lifting device with 0-5A alternating current up-flow to 500A or 800A.According to the difference of mutual inductor, when volt-ampere characteristic was tested, after boosting by stepup transformer, maximum output voltage can reach 2000V; When no-load voltage ratio is tested, behind the current lifting device up-flow, maximum output current 1500A.Existing method of testing and equipment have the following disadvantages:
1, built-in stepup transformer of equipment itself and current lifting device equipment heaviness.
2, when volt-ampere characteristic test, there is significant limitation in this test mode: along with the rising of system voltage grade, the saturation voltage of mutual inductor is more and more higher, also needs external step-up transformer during test, required testing apparatus is just heavy more, and whole testing tool weight is greater than 60KG.And for transient current transformer, the saturation voltage of a lot of transient state mutual inductors is up to 15KV, about average saturation voltage 8KV, this method of testing can't be exported so high voltage at all, and the highest 4KV that is no more than of the dielectric voltage withstand of mutual inductor own, even the step-up transformer (this transformation is thought highly of more than the 200KG) of output 15KV is arranged, test the dielectric voltage withstand of understanding the breakdown current mutual inductor with such method of testing, bring fatal damage to mutual inductor.Conventional test products can only be applied to the test of 220KV with lower part current transformer (saturation voltage is less than 2000V).
3, when no-load voltage ratio is tested, can't test for the mutual inductor that no-load voltage ratio is bigger, as: the outlet mutual inductor ratio of the genset of at present domestic 60WMVA is 25000/5, test routinely, the electric current that needs input 25000A, there is not testing apparatus can export so big electric current at all, the output of conventionally test instrument is generally 500A-800A, can reach 1500A behind the external current lifting device, do not reach test request at all,, can't test yet for these current transformers even conventional common current transformer also has a lot of no-load voltage ratios greater than 1500/5 (total quantity about 40%), current transformer test for little no-load voltage ratio, need external current lifting device, these current lifting devices are very heavy, and only p-wire weighs tens of kilograms, do not fit into on-the-spot test, be not suitable for transporting and carrying yet.
4, when no-load voltage ratio is tested, because the mutual inductor primary side has only a connection terminal in bushing transformer and the GIS, another terminal is inner and GIS inside at transformer, and therefore this method can't be to directly test of mutual inductor in bushing transformer and the GIS.When being tested, these mutual inductors transformer oil need be found time, casing current transformer is hung out, test then, after finishing, test also to reinstall, the test process of a casing current transformer continues one day time possibly, work efficiency is extremely underground, has extended the time that has a power failure.
Summary of the invention
The objective of the invention is above-mentioned all deficiencies that method of testing and used testing apparatus at existing current transformer exist, the automatic test of satisfying various current transformers is provided, when satisfying conventionally test, according to national standard and international standard, the automatic analytical test result of instrument, reduce the loss that human error causes, help increasing work efficiency a kind of high-performance current transformer intelligent analyzer of increasing economic efficiency.
The objective of the invention is to be achieved through the following technical solutions, a kind of high-performance current transformer intelligent analyzer is characterized in that described analyser is made of control calculating section, the output that is connected with the control calculating section, importation, PC interface, man-machine conversation part and memory device.
Described control calculating section is core with the dsp chip, controls output, measurement, man-machine conversation and memory device etc., and various test datas are calculated and handled, and calculates according to standard analysis automatically.
Described output is made of output control circuit and amplifier, and output control circuit is independent FPGA control, adopts high-resolution D/A converter, and amplifier adopts metering level high precision switching amplifier.
Described input measurement partly adopts high-precision hall measurement device and adopts 16 high-precision A/D chip of sigma-delta technology, and anti-jamming circuit is set.
Described PC interface directly is connected with computing machine, utilizes the computer control test, and computing machine is uploaded in report automatically, generates the report of WORD or EXCEL form.
Super large liquid crystal display, complete Chinese operation interface, man-machine dialog interface close friend are adopted in described man-machine conversation.
Described memory device is with the storage medium of SD card as test data.
The present invention is when the volt-ampere characteristic test of transient current transformer and conventional high saturation characteristic mutual inductor, because only need change the frequency of output during test, the maximum 120V of output amplitude just can test the transient state mutual inductor of saturation voltage 15000KV, changed the blank that does not have home equipment that the transient state winding is tested at present, and instrument output test voltage is low, can not cause potential safety hazard to equipment and personal safety, the step-up transformer of usefulness owing to do not need to boost (the tens of kilograms of general transformer weight) alleviates the testing apparatus weight of knowing clearly greatly.
During to mutual inductor in bushing transformer and the GIS and the test of conventional mutual inductor ratio, because on-the-spot transformer N point ground connection, another input end of instrument needs only ground connection and can test, when testing with this kind method, transformer secondary side resistance (4K Ω-10K Ω) meeting series connection is to instrument input measurement end, but the testing tool internal resistance is 400M Ω, and maximum dividing potential drop is 10K/400M=0.0025%, and such error can be ignored
Utilize this test philosophy, do not need to export big electric current, can get final product with the shared high-accuracy voltage source of test volt-ampere property.Can test 25000/5 current transformer of domestic maximum.During transformer test, can directly test in to bushing transformer and GIS, whole test process only needs several minutes, and conventionally test needs nearly one day time, improved work efficiency greatly, shortened power off time, brought huge economic benefit to electric system.
The invention solves the domestic situation that can't carry out the transient current transformer of 500KV and above network system at present, by adopting new test philosophy, can carry out comprehensively projects such as the volt-ampere characteristic of transient current transformer, direct current resistance, no-load voltage ratios, test automatically, satisfied the needs of electric power netting safe running.And can whether have defective by automatic analysis equipment, when having reduced artificial judgement because the erroneous judgement that people's subjective reason causes is disconnected.
Can carry out analytical calculation to the current transformer transient characterisitics according to test result, for the fault analysis of electric system with adjust to calculate theoretical foundation is provided.
Can directly test the specific current mutual inductor.Automatic test as the conventional mutual inductor of casing current transformer and generalized information system.Test to these mutual inductors does not need dismounting.Originally the test event that need test the time only reduced to need can all test in five minutes finish, improved work efficiency, reduce power off time, bring very big economic benefit.
Can satisfy the automatic test of all conventional current mutual inductor all items.Automatic analytical test result.Reduce the loss that human error causes.
Utilize advanced measuring technology, be relieved to weight and below 10KG, made things convenient for the transportation of equipment and carry originally only testing just need the weigh equipment of 60KG of conventional current mutual inductor.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention.
Embodiment
Further specify the present invention in conjunction with the accompanying drawings and embodiments, the present invention is made of control calculating section, the output that is connected with the control calculating section, importation, PC interface, man-machine conversation part and memory device.
1, the volt-ampere characteristic of transient current transformer and conventional high saturation characteristic mutual inductor test is according to formula Es=(N
2* 2 π fBAc)/, Ac, N2 are constant, and magnetic flux is constant when supposing that B is saturated, changes the size of f so, and Es is also linear thereupon to be changed.When f diminished so, the voltage of tester input also can diminish.After the test, by the inverse relation of electromotive force and magnetic flux, in the time of can calculating f=50Hz (being power-frequency voltage), for the needed electromotive force that reaches capacity.
It more than is the situation under the perfect condition, test philosophy is also uncomplicated, but it is actual in transformer iron core, not every energy can be converted into exciting current, some is an iron core eddy current loss, this part eddy current loss and frequency then are not linear relationships, and the corresponding more complicated that concerns is difficult to accurately convert.This also is the technological core of native system.Through a large amount of site test and theoretical validation, also there is certain relation in the part of loss with frequency, if do not consider this nonlinear relation, can produce huge error so in conversion, even mistake.We have then made correct conversion to the relation of this existence by the high-performance current transformer intelligent analyzer of research and development, have guaranteed measuring accuracy.(concrete formula slightly), and according to the result, can carry out transient analysis to mutual inductor is for the fault analysis of electric system and the calculating of adjusting provide theoretical foundation.
2, mutual inductor and conventional mutual inductor ratio test in bushing transformer and the GIS
In the secondary side making alive amount of mutual inductor, once surveying induced voltage:
Then: no-load voltage ratio N=Us/Up---------Us is the secondary input voltage, and Up is a primary induction voltage.
For in bushing transformer and the GIS during transformer test, because on-the-spot transformer N point ground connection, another input end of instrument needs only ground connection and can test, when testing with this kind method, transformer secondary side resistance (4K Ω-10K Ω) meeting series connection is to instrument input measurement end, but the testing tool internal resistance is 400M Ω, and maximum dividing potential drop is 10K/400M=0.0025%, and such error can be ignored
3, infer nameplate function and automatic analytical test function as a result automatically:
On the basis of test,, can calculate saturation point current/voltage value automatically according to the IEC standard.And can extrapolate the nameplate parameter (formula slightly) of mutual inductor.Comprise instrument safety coefficient FS, accurate limit value coefficient ALF, specified symmetrical short-circuit current coefficient Kssc, secondary circuit time constant Ts, remanent magnetism COEFFICIENT K r, pulsactor Ls.Parameters such as unsaturated inductance L u. infer the nameplate parameter of mutual inductor automatically, prevent from the process that mutual inductor is installed, setup error to occur.
According to IEC standard definition mutual inductor grade, judge the mutual inductor measuring test result automatically.Whether automatic analysis equipment exists defective, when having reduced artificial judgement because the erroneous judgement that people's subjective reason causes is disconnected.
Claims (7)
1, a kind of high-performance current transformer intelligent analyzer is characterized in that described analyser is made of control calculating section, the output that is connected with the control calculating section, importation, PC interface, man-machine conversation part and memory device.
2, high-performance current transformer intelligent analyzer according to claim 1, it is characterized in that described control calculating section is core with the dsp chip, control output, measurement, man-machine conversation and memory device etc., and various test datas are calculated and handle, and calculate according to standard analysis automatically.
3, high-performance current transformer intelligent analyzer according to claim 1, it is characterized in that described output is made of output control circuit and amplifier, output control circuit is independent FPGA control, adopt high-resolution D/A converter, amplifier adopts metering level high precision switching amplifier.
4, high-performance current transformer intelligent analyzer according to claim 1 is characterized in that described input measurement partly adopts 16 high-precision A/D chip of high-precision hall measurement device and employing sigma-delta technology, and anti-jamming circuit is set.
5, high-performance current transformer intelligent analyzer according to claim 1 is characterized in that described PC interface directly is connected with computing machine, utilizes the computer control test, and computing machine is uploaded in report automatically, generates the report of WORD or EXCEL form.
6, high-performance current transformer intelligent analyzer according to claim 1 is characterized in that the liquid crystal display of described man-machine conversation employing super large, complete Chinese operation interface, man-machine dialog interface close friend.
7, high-performance current transformer intelligent analyzer according to claim 1 is characterized in that described memory device is with the storage medium of SD card as test data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810024473A CN101545963A (en) | 2008-03-25 | 2008-03-25 | High-performance current transformer intelligent analyzer |
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| CN200810024473A CN101545963A (en) | 2008-03-25 | 2008-03-25 | High-performance current transformer intelligent analyzer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087347A (en) * | 2009-12-08 | 2011-06-08 | 张建 | Charged test method for current transformer and application thereof |
| CN102654571A (en) * | 2011-03-02 | 2012-09-05 | 深圳市凯弦电气自动化有限公司 | Comprehensive tester of current transformer |
| CN103761895A (en) * | 2014-01-09 | 2014-04-30 | 广西电网公司电力科学研究院 | Current transformer simulation examination system and working method |
| CN112630494A (en) * | 2020-12-11 | 2021-04-09 | 国网重庆市电力公司营销服务中心 | Automatic measuring equipment for security coefficient of anti-direct-current low-voltage current transformer instrument |
-
2008
- 2008-03-25 CN CN200810024473A patent/CN101545963A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087347A (en) * | 2009-12-08 | 2011-06-08 | 张建 | Charged test method for current transformer and application thereof |
| CN102654571A (en) * | 2011-03-02 | 2012-09-05 | 深圳市凯弦电气自动化有限公司 | Comprehensive tester of current transformer |
| CN102654571B (en) * | 2011-03-02 | 2014-11-05 | 深圳市凯弦电气自动化有限公司 | Comprehensive tester of current transformer |
| CN103761895A (en) * | 2014-01-09 | 2014-04-30 | 广西电网公司电力科学研究院 | Current transformer simulation examination system and working method |
| CN112630494A (en) * | 2020-12-11 | 2021-04-09 | 国网重庆市电力公司营销服务中心 | Automatic measuring equipment for security coefficient of anti-direct-current low-voltage current transformer instrument |
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Open date: 20090930 |