CN201514474U - Parameter test instrument of current transformer - Google Patents
Parameter test instrument of current transformer Download PDFInfo
- Publication number
- CN201514474U CN201514474U CN200920086983XU CN200920086983U CN201514474U CN 201514474 U CN201514474 U CN 201514474U CN 200920086983X U CN200920086983X U CN 200920086983XU CN 200920086983 U CN200920086983 U CN 200920086983U CN 201514474 U CN201514474 U CN 201514474U
- Authority
- CN
- China
- Prior art keywords
- circuit
- variable
- control circuit
- power supply
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000012360 testing method Methods 0.000 title abstract description 29
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 9
- 238000002955 isolation Methods 0.000 abstract 4
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 230000001681 protective effect Effects 0.000 description 9
- 230000001052 transient effect Effects 0.000 description 8
- 210000003127 knee Anatomy 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model relates to a parameter test instrument of a current transformer, which belongs to an electric power test instrument. The utility model is characterized in that a work power supply and a variable-frequency power supply are connected with the commercial power through a switch and a fuse, the variable-frequency power supply is output to an S1 and an S2 through a wave filter, the current output to the S2 by the wave filter is sampled by an isolation circuit 1, the variable-frequency power supply is controlled by a power supply control circuit, a U1 and a U2 carry out secondary side voltage sampling through an isolation circuit 2, signals of a P1 and a P2 are extracted by an isolation circuit 3, signals obtained by three isolation circuits are output to a signal regulating and signal collecting circuit, a mouse and the signal regulating and signal collecting circuit input the signals into a digital signal processor, and signals of the digital signal processor are output to the power supply control circuit, a clock control circuit, a communication control circuit a display module and a printer. The utility model solves the problems that the existing test instrument can not be used for testing a TP grade current transformer, and the equipment is heavy. The utility model reduces the size and the weight of the test instrument, and improves the automation degree.
Description
Technical field
The utility model relates to a kind of current mutual-inductor parameter tester, is used for the parameter testing of TP level protective current transformer,, belongs to the power test instrument.
Background technology
Expansion along with the electrical network scale; system short circuit capacity increases; in order accurately to reflect the more feature of great dynamic range short-circuit current; the use of TP level protective current transformer, is more and more general; adhere to specification so guarantee the characteristic parameter of the TP level current transformer of rig-site utilization, safe operation of power system is had crucial effects.
Various features for the bigger short-circuit current (having various transient characterisitics) of correct reflection primary side; the saturation point unshakable in one's determination of TP level winding improves greatly than the saturation point unshakable in one's determination of P level winding; make the knee voltage of TP level current transformer protection winding improve greatly; scope is from 4kV～20kV; maximum near 30kV; keen current is at several amperes, and the test capacity of calculating is near 150kVA.If adopt traditional test method, be difficult to obtain so big power supply capacity in the testing ground, Secondary Winding insulation simultaneously can not be born high voltage at all, can not finish the routine test of its excitation property parameter at the scene.
According to " JBT/5356-2002 current transformer test guide rule "; " GB1208-2006 current transformer " 14.3 sections; the requirement of " requirement of GB16847-1997 protective current transformer, transient characterisitics "; the current error of protective current transformer; phase error and combination misalignment (the peak value transient error of TP level) can not surpass the limit value of regulation; wherein combination misalignment requires to be not more than: 5% (5P); whether qualified 10% (the peak value transient error of 10P and TP level) be the on-the-spot index of differentiating protective current transformer, more important (with respect to knee voltage and keen current).The straightway testing method need be raised to primary side current tens of kilo-amperes (P level) to hundreds of kilo-amperes (TP level), requirement according to " GB1208-2006 current transformer " appendix C .4 and " JBT/5356-2002 current transformer test guide rule " 22.3, combination misalignment (perhaps peak value transient error) is measured needs oscillograph or transient state registering instrument, the experiment power supply capacity is big, test record device quantity is many, wiring is loaded down with trivial details, and site test is difficult to finish.
The limitation of existing tester
Existing pilot system is to apply industrial frequency experiment voltage at tested winding two ends to the test of excitation property, rises to rated current, retouches out exciting characteristic curve; To error measure, adopt the method for straightway testing, promptly apply big electric current at primary side, utilize combination misalignment standard mutual inductor, load box and transient state registering instrument, carry out according to the requirement of " JBT/5356-2002 current transformer test guide rule " 22.2.The limitation of classic method has:
1. need jumbo site test power supply
On-the-spot high capacity industrial frequency experiment power supply obtains comparatively difficulty, and it is heavy that equipment also seems.Even P level current transformer test, traditional Testing Instrument for Volt-ampere Characteristic weight also will reach 30-40kg, also need to add pressure regulator and current lifting device under a lot of situations, operate loaded down with trivial details, inefficiency.
2. can not finish TP level protective current mutual inductor excitation characteristic test
Because the knee voltage of TP level protective current mutual inductor is higher than the insulation withstand voltage of Secondary Winding far away, make traditional tester can not realize detection to TP level current transformer.
Summary of the invention
The purpose of this utility model is to overcome drawback of the prior art and deficiency, and a kind of current mutual-inductor parameter tester is provided, and is used for the parameter testing of TP level protective current transformer.
The technical solution adopted in the utility model is: working power and variable-frequency power sources are electrically connected with the city by switch and fusing, variable-frequency power sources comprises wave filter, variable-frequency power sources outputs to secondary terminal S1, the S2 of mutual inductor through wave filter, and wave filter outputs to the electric current of secondary terminal S2 of mutual inductor by through buffer circuit 1 sampling; The amplitude of variable-frequency power sources and output frequency are subjected to the control of power control circuit; Voltage tester terminal U1, U2 carry out the voltage sampling of secondary side by buffer circuit 2, and a terminals P 1 that is connected with mutual inductor, P2 are extracted behind the signals voltage sampling as a winding by buffer circuit 3; The signal that buffer circuit 1, buffer circuit 2 and buffer circuit 3 obtain is input to signal condition and signal acquisition circuit; Input/Output Device comprises mouse, display module and printer; Mouse and signal condition and signal acquisition circuit are input to digital signal processor with signal; The signal of digital signal processor outputs to power control circuit, clock control circuit, communication control circuit, display module and printer.
The beneficial effects of the utility model:
1. solve the actual techniques problem that TP level mutual inductor parameter can not be tested in the power test scene.
2. for the existing apparatus of test common current mutual inductor, also reduce volume and quality, improved automaticity.
The chip model of digital signal processor of the present utility model is TMS320F2812, thereby inner generation is stable, adjustable, frequency conversion (frequency reducing) sine wave signal of standard, further significantly reduces device volume and quality.Can finish functions such as control, data acquisition control, digital signal processing and Communication Control, man-machine interaction to the test variable-frequency power sources.
The minimum 0.1Hz that reaches of test frequency of the present utility model, 1/500 when the equivalent test capacity during 0.1Hz is 50Hz.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Embodiment:
Describe below in conjunction with accompanying drawing.
In Fig. 1, working power and variable-frequency power sources are electrically connected with the city by switch and fusing, variable-frequency power sources comprises wave filter, variable-frequency power sources outputs to secondary terminal S1, the S2 of mutual inductor through wave filter, and the electric current that wave filter outputs to the secondary terminal S2 of mutual inductor is carried out the sampling of secondary side exciting current through buffer circuit 1; The amplitude of variable-frequency power sources and output frequency are subjected to the control of power control circuit; Voltage tester terminal U1, U2 carry out the voltage sampling of secondary side by buffer circuit 2, and a terminals P 1 that is connected with mutual inductor, P2 are extracted behind the signals voltage sampling as a winding by buffer circuit 3; The signal that buffer circuit 1, buffer circuit 2 and buffer circuit 3 obtain is input to signal condition and signal acquisition circuit; Input/Output Device comprises mouse, display module and printer; Mouse and signal condition and signal acquisition circuit are input to digital signal processor with signal; The signal of digital signal processor output to power control circuit, clock control circuit,, communication control circuit, display module and printer.
The utility model can be finished the combination misalignment of TP level protective current transformer,, accurately limit value coefficient, instrument safety coefficient, symmetrical short-circuit electric current multiple, secondary time constant, transient state area coefficient, remanent magnetism coefficient, knee voltage and electric current, unsaturated inductance, ratio and angular difference, the isoparametric test of 10% (5%) graph of errors.
Claims (2)
1. current mutual-inductor parameter tester, it is characterized in that: working power and variable-frequency power sources are electrically connected with the city by switch and fusing, variable-frequency power sources comprises wave filter, variable-frequency power sources outputs to secondary terminal S1, the S2 of mutual inductor through wave filter, and wave filter outputs to the electric current of secondary terminal S2 of mutual inductor by through buffer circuit 1 sampling; The amplitude of variable-frequency power sources and output frequency are subjected to the control of power control circuit; Voltage tester terminal U1, U2 carry out the voltage sampling of secondary side by buffer circuit 2, and a terminals P 1 that is connected with mutual inductor, P2 are extracted behind the signals voltage sampling as a winding by buffer circuit 3; The signal that buffer circuit 1, buffer circuit 2 and buffer circuit 3 obtain is input to signal condition and signal acquisition circuit; Input/Output Device comprises mouse, display module and printer; Mouse and signal condition and signal acquisition circuit are input to digital signal processor with signal; The signal of digital signal processor outputs to power control circuit, clock control circuit, communication control circuit, display module and printer.
2. current mutual-inductor parameter tester according to claim 1 is characterized in that: the chip model of digital signal processor is TMS320F2812.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920086983XU CN201514474U (en) | 2009-07-03 | 2009-07-03 | Parameter test instrument of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920086983XU CN201514474U (en) | 2009-07-03 | 2009-07-03 | Parameter test instrument of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201514474U true CN201514474U (en) | 2010-06-23 |
Family
ID=42485887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920086983XU Expired - Lifetime CN201514474U (en) | 2009-07-03 | 2009-07-03 | Parameter test instrument of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201514474U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103424730A (en) * | 2013-08-13 | 2013-12-04 | 国家电网公司 | Current transformer field calibration system |
| CN106501749A (en) * | 2016-11-03 | 2017-03-15 | 国网山西省电力公司检修分公司 | A kind of CT transient characterisitics and actual remanent magnetism detecting system |
| CN107271757A (en) * | 2017-04-28 | 2017-10-20 | 国家电网公司 | Low Voltage Cable Current Test Recorder |
| 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 |
| CN112924920A (en) * | 2021-02-02 | 2021-06-08 | 中国南方电网有限责任公司超高压输电公司柳州局 | Portable measuring device and parameter measuring method for high-voltage electromagnetic voltage transformer |
-
2009
- 2009-07-03 CN CN200920086983XU patent/CN201514474U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103424730A (en) * | 2013-08-13 | 2013-12-04 | 国家电网公司 | Current transformer field calibration system |
| CN106501749A (en) * | 2016-11-03 | 2017-03-15 | 国网山西省电力公司检修分公司 | A kind of CT transient characterisitics and actual remanent magnetism detecting system |
| CN107271757A (en) * | 2017-04-28 | 2017-10-20 | 国家电网公司 | Low Voltage Cable Current Test Recorder |
| 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 |
| CN112924920A (en) * | 2021-02-02 | 2021-06-08 | 中国南方电网有限责任公司超高压输电公司柳州局 | Portable measuring device and parameter measuring method for high-voltage electromagnetic voltage transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102654571B (en) | Comprehensive tester of current transformer | |
| CN201514474U (en) | Parameter test instrument of current transformer | |
| CN205080251U (en) | Through -flow calibration system of current transformer secondary circuit | |
| CN105699818A (en) | Error measurement apparatus and measurement method for current transformer | |
| CN108020804A (en) | A kind of system and method for being used to carry out capacitance type potential transformer site error on-line checking | |
| CN103278790A (en) | Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof | |
| CN109541516B (en) | Voltage transformer broadband error measurement method | |
| CN101770006A (en) | Novel method for checking electronic transducer | |
| CN208818818U (en) | A kind of low-power consumption program control type current mutual inductor field detecting device | |
| CN106483397B (en) | A kind of electric energy quality detection device and measurement method of high-precision high bandwidth | |
| CN106054102A (en) | Current-transformer harmonic wave error measurement system | |
| CN205038273U (en) | Measurement device for earthing device power frequency and impact characteristic parameter | |
| CN204945357U (en) | A kind of electronic mutual inductor steady state error measuring means | |
| CN203658453U (en) | Wireless secondary voltage-drop and load tester provided with wireless synchronous communication function | |
| CN101614798B (en) | Electronic Transformer Polarity Detection System | |
| CN205656294U (en) | Current transformer error measuring apparatu | |
| CN104391264B (en) | Multi-function electronic transformer checking system and method for calibration | |
| CN116106659B (en) | Distribution transformer energy efficiency high-precision test system and application | |
| Zhiwu et al. | Enhanced on-site testing of DC current transformers using improved EMD filtering and high-precision synchronization | |
| CN104407240A (en) | Loss online detecting system for three-winding transformer and loss calculating method | |
| CN202330691U (en) | Field calibrating equipment for voltage transformer | |
| CN104880686A (en) | Device and method for checking portable electronic current transformer | |
| CN105866592B (en) | Dynamic passive compensation response wave shape acquisition system and acquisition method | |
| CN103439682A (en) | Portable current transformer composite error testing device and method for testing composite error of current transformer by utilizing portable current transformer composite error testing device | |
| CN107589330B (en) | Live detection system and method for loss of power transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: WUHAN DAYANG YITIAN TECHNOLOGY CO., LTD. Free format text: FORMER NAME: WUHAN YITIAN SCIENCE AND TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Two 1 block 1505, Optics Valley Pioneer Street, East Lake Development Zone, Hubei, Wuhan 430079, China, 1 Patentee after: WUHAN DAYANG YITIAN TECHNOLOGY CO., LTD. Address before: 430070 Hubei city of Wuhan province East Lake Dongxin Road Development Zone SBI Venture Street No. 1-801 Patentee before: Wuhan Yitian Science and Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100623 |
|
| CX01 | Expiry of patent term |