CN202886585U - On-line test device for voltage/current transformer - Google Patents

On-line test device for voltage/current transformer Download PDF

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Publication number
CN202886585U
CN202886585U CN 201220497061 CN201220497061U CN202886585U CN 202886585 U CN202886585 U CN 202886585U CN 201220497061 CN201220497061 CN 201220497061 CN 201220497061 U CN201220497061 U CN 201220497061U CN 202886585 U CN202886585 U CN 202886585U
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China
Prior art keywords
voltage
circuit
mutual inductor
electrically
current transformer
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CN 201220497061
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Chinese (zh)
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朱亚军
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ZHUHAI KEHUI ELECTRIC APPARATUS CO Ltd
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ZHUHAI KEHUI ELECTRIC APPARATUS CO Ltd
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Abstract

The utility model discloses a test device and aims to provide an on-line test device for a voltage/current transformer. Due to the adoption of the device, the test operation can be performed without current interruption, and neither an experimental power supply nor a standard voltage/current transformer is needed. The device comprises a CPU (central processing unit) (8), a signal generator (1), an A/D (analog to digital) converter (7), a display module (9), an input interface circuit (2) and a sampling circuit (6), wherein the signal generator (1), the A/D converter (7) and the display module (9) are electrically connected with the CPU (8). The input interface circuit (2) is electrically connected with the signal generator (1) and is electrically connected with a primary loop (3) on one side of a to-be-tested transformer (4). The sampling circuit (6) is electrically connected with the A/D converter (7) and is electrically connected with a secondary loop (5) on the other side of the to-be-tested transformer (4). Therefore, a loop for the on-line test of the to-be-tested transformer (4) is formed.

Description

A kind of voltage or current transformer online testing device
Technical field
The utility model relates to a kind of voltage or current transformer online testing device.
Background technology
Voltage or current transformer Main Function are voltage transformation and current transformation, are widely used in reaching in the various application circuits in the power distribution networks.Voltage or current transformer need to carry out periodic technical test and test in daily use procedure, meet the requirements to guarantee its precision.According to the relevant vertification regulation of country, voltage or current transformer generally all are that the test that it is main and calibrating project are exactly error testing in the situation that outage is tested or examined and determine.Under the prior art, people adopt device as shown in Figure 1 to carry out error testing usually, it mainly is made of several parts such as experiment power supply, normal voltage or current transformer, tested mutual inductor, error measuring means and voltage or current capacity casees, and this proving installation and method then have following some deficiency:
The circuit at tested mutual inductor place must cut off the power supply when (1) testing, and outage is not worked and then can be affected and pin down the work efficiency of interlock circuit;
(2) normal voltage or current transformer must be arranged, in case itself there are error in normal voltage or current transformer, can cause very large error to final test result;
(3) must be equipped with experiment power supply and electric current and voltage Burden box, not only waste energy, also improve testing cost;
(4) will obtain more accurate error testing and just must repeatedly test, test process is complicated, the cycle is long, tests dumbly, can't test by real-time on-site.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of electric current outage that do not need is provided, and need not provide experiment power supply, need not voltage or the current transformer online testing device of normal voltage or current transformer.
The technical scheme that the utility model adopts is: be a kind of voltage or current transformer online testing device with the utility model, it and tested mutual inductor are connected in parallel, and the two ends of described voltage or current transformer online testing device are electrically connected with the primary circuit of described tested mutual inductor both sides and secondary circuit respectively and consist of one to the loop of described tested mutual inductor on-line testing.
Preferably, described voltage or current transformer online testing device comprise CPU, the signal generator, A/D converter and the display module that are electrically connected with described CPU, the input interface circuit that is electrically connected with described signal generator, the sample circuit that is electrically connected with described A/D converter, described input interface circuit is electrically connected on the primary circuit of described tested mutual inductor one side, described sample circuit is electrically connected on the secondary circuit of described tested mutual inductor opposite side, consists of the loop to described tested mutual inductor on-line testing.
Preferably, described signal generator is for generation of the calibration alternating voltage or the current signal that are different from the electrical network AC signal; The primary circuit that described input interface circuit is directly coupled to described tested mutual inductor one side for calibration voltage or current signal with described signal generator generation; Described sample circuit is used for extracting actual measurement alternating voltage or current signal from the secondary circuit of described tested mutual inductor opposite side; Described A/D converter is used for carrying out analog to digital conversion after the described actual measurement alternating voltage that will extract or the current signal shaping; Described CPU is used for actual measurement alternating voltage or current signal after the conversion are carried out digital processing and computing, then compares and computing with every electrical quantity of described calibration alternating voltage or current signal; Described display module is used for operation result and conclusion are shown.
The beneficial effects of the utility model are: the utility model is as a kind of online testing device, it and tested mutual inductor are connected in parallel and consist of an on-line testing loop, in test process, do not need the down circuitry to the mutual inductor place, mutual inductor still can be carried out voltage or current transformation work, simultaneously do not need to provide experiment power supply and normal voltage or current transformer yet, effectively reduce testing cost.
Further, the utility model is by signal generator, input interface circuit, sample circuit, A/D converter, CPU and the display module online testing device that is electrically connected to form, and be electrically connected with primary circuit and the secondary circuit of described tested mutual inductor both sides respectively, and consist of one to the loop of described tested mutual inductor on-line testing, in the whole test process, the test operation method is simple, test period is short, the test dirigibility is high, described signal generator can produce at any time calibration alternating voltage or a current signal that is different from the electrical network AC signal and also test at once, in time obtain test result, meet especially the requirement of voltage or current transformer needs periodic verification and test in daily use procedure, guaranteed the service precision of voltage or current transformer.
Description of drawings
Fig. 1 is the test philosophy block diagram of voltage or current transformer under the prior art;
Fig. 2 is test philosophy block diagram of the present utility model.
Embodiment
As shown in Figure 2, the utility model relates to a kind of voltage or current transformer online testing device, described voltage or current transformer online testing device and tested mutual inductor are connected in parallel, and the two ends of described voltage or current transformer online testing device are electrically connected with the primary circuit of described tested mutual inductor both sides and secondary circuit respectively and consist of an on-line testing loop.Particularly, described voltage or current transformer online testing device comprise CPU8, the signal generator 1 that is electrically connected with described CPU8, A/D converter 7 and display module 9, the input interface circuit 2 that is electrically connected with described signal generator 1, the sample circuit 6 that is electrically connected with described A/D converter 7, described input interface circuit 2 is electrically connected on the primary circuit 3 of described tested mutual inductor 4 one sides, described sample circuit 6 is electrically connected on the secondary circuit 5 of described tested mutual inductor 4 opposite sides, thereby consists of one to the loop of described tested mutual inductor 4 on-line testings.
Under the control of described CPU8, described signal generator 1 is for generation of the calibration alternating voltage or the current signal that are different from the electrical network AC signal, and the calibration alternating voltage that produces of described signal generator 1 or the voltage of current signal, electric current, the electrical quantity of frequency and phase place all can artificially be set, the electrical quantity that needs only setting signal when test is different from the electrical network AC signal, for example our frequency of electrical network AC signal commonly used is 50hz, and when test, the frequency that we can artificially set calibration alternating voltage or current signal is not equal to 50hz, just can test.The primary circuit 3 that described input interface circuit 2 is directly coupled to described tested mutual inductor 4 one sides for calibration voltage or current signal with described signal generator 1 generation.
In test process, have electrical network AC signal and calibration alternating voltage or these two kinds of signals of current signal by described tested mutual inductor 4, thereafter every electrical quantity of these two kinds of signals all can change, the change amount depends on the error component size of described tested mutual inductor 4, described calibration alternating voltage or current signal just become actual measurement alternating voltage or current signal after by described tested mutual inductor 4, and described sample circuit 6 is used for from the secondary circuit 5 of described tested mutual inductor 4 opposite sides extracting described actual measurement alternating voltage or current signal, and described actual measurement alternating voltage or current signal are exactly signal to be tested.
Under the control of described CPU8, described A/D converter 7 is used for carrying out analog to digital conversion after the described actual measurement alternating voltage that will extract or the current signal shaping, returns to described CPU8 again; Described CPU8 is used for actual measurement alternating voltage or current signal after the conversion are carried out digital processing and computing, then compare and computing with the calibration alternating voltage of described signal generator 1 generation or every electrical quantity of current signal, finally draw the actual error of described tested mutual inductor 4, and described display module 9 is used for operation result and conclusion are shown, the tester can obtain the error of work at present very intuitively.
The method of utilizing the utility model to test mainly may further comprise the steps:
(1) controls described signal generator 1 by described CPU8 and produce known and calibration alternating voltage or a current signal that be different from the electrical network AC signal, then by described input interface circuit 2 described calibration alternating voltage or current signal are coupled on primary circuit 3 circuit of described tested mutual inductor 4 one sides;
(2) on secondary circuit 5 circuit of described tested mutual inductor 4 opposite sides, control 6 pairs of described sample circuits by described CPU8 and carry out discrete sampling by the signal on the circuit, therefrom extract actual measurement alternating voltage or current signal, by described A/D converter 7 described actual measurement alternating voltage or current signal are carried out analog to digital conversion again, and transformation result is back to described CPU8;
(3) described CPU8 processes transformation result obtained above and computing, and compare and computing with every electrical quantity of described calibration alternating voltage or current signal, finally obtain the actual error of described tested mutual inductor 4 and show with described display module 9.
Use this method of testing, test operation is simple, and the test dirigibility is strong, can described tested mutual inductor 4 be carried out error testing and obtain fast test result real-time on-site.
The utility model is widely used in voltage or current transformer field tests.

Claims (3)

1. a voltage or current transformer online testing device, it is characterized in that: described voltage or current transformer online testing device and tested mutual inductor are connected in parallel, and the two ends of described voltage or current transformer online testing device are electrically connected with the primary circuit of described tested mutual inductor both sides and secondary circuit respectively and consist of one to the loop of described tested mutual inductor on-line testing.
2. a kind of voltage according to claim 1 or current transformer online testing device, it is characterized in that: described voltage or current transformer online testing device comprise CPU, the signal generator that is electrically connected with described CPU, A/D converter and display module, the input interface circuit that is electrically connected with described signal generator, the sample circuit that is electrically connected with described A/D converter, described input interface circuit is electrically connected on the primary circuit of described tested mutual inductor one side, described sample circuit is electrically connected on the secondary circuit of described tested mutual inductor opposite side, consists of the loop to described tested mutual inductor on-line testing.
3. a kind of voltage according to claim 2 or current transformer online testing device is characterized in that:
Described signal generator is for generation of the calibration alternating voltage or the current signal that are different from the electrical network AC signal;
The primary circuit that described input interface circuit is directly coupled to described tested mutual inductor one side for calibration voltage or current signal with described signal generator generation;
Described sample circuit is used for extracting actual measurement alternating voltage or current signal from the secondary circuit of described tested mutual inductor opposite side;
Described A/D converter is used for carrying out analog to digital conversion after the described actual measurement alternating voltage that will extract or the current signal shaping;
Described CPU is used for actual measurement alternating voltage or current signal after the conversion are carried out digital processing and computing, then compares and computing with every electrical quantity of described calibration alternating voltage or current signal;
Described display module is used for operation result and conclusion are shown.
CN 201220497061 2012-09-26 2012-09-26 On-line test device for voltage/current transformer Active CN202886585U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220497061 CN202886585U (en) 2012-09-26 2012-09-26 On-line test device for voltage/current transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220497061 CN202886585U (en) 2012-09-26 2012-09-26 On-line test device for voltage/current transformer

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CN202886585U true CN202886585U (en) 2013-04-17

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102866378A (en) * 2012-09-26 2013-01-09 珠海市科荟电器有限公司 Voltage or current transformer on-line test device and voltage or current transformer on-line test method
CN105259530B (en) * 2015-11-04 2018-11-13 国网山东昌乐县供电公司 A kind of mutual inductor check device
US10345419B2 (en) 2015-12-21 2019-07-09 General Electric Company On-line calibration and compensation of a current transformer
CN111090072A (en) * 2020-03-24 2020-05-01 北京锐创新智科技有限公司 CT loop wireless automatic checking device and checking method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102866378A (en) * 2012-09-26 2013-01-09 珠海市科荟电器有限公司 Voltage or current transformer on-line test device and voltage or current transformer on-line test method
CN102866378B (en) * 2012-09-26 2015-06-24 珠海市科荟电器有限公司 Voltage or current transformer on-line test device and voltage or current transformer on-line test method
CN105259530B (en) * 2015-11-04 2018-11-13 国网山东昌乐县供电公司 A kind of mutual inductor check device
US10345419B2 (en) 2015-12-21 2019-07-09 General Electric Company On-line calibration and compensation of a current transformer
CN111090072A (en) * 2020-03-24 2020-05-01 北京锐创新智科技有限公司 CT loop wireless automatic checking device and checking method
CN111090072B (en) * 2020-03-24 2020-07-31 北京锐创新智科技有限公司 CT loop wireless automatic checking device and checking method

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