CN203422465U - Portable voltage and current detection device for current transformer - Google Patents
Portable voltage and current detection device for current transformer Download PDFInfo
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- CN203422465U CN203422465U CN201320574060.5U CN201320574060U CN203422465U CN 203422465 U CN203422465 U CN 203422465U CN 201320574060 U CN201320574060 U CN 201320574060U CN 203422465 U CN203422465 U CN 203422465U
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- 238000001514 detection method Methods 0.000 title abstract 3
- 238000005259 measurement Methods 0.000 claims description 19
- 238000002955 isolation Methods 0.000 claims description 12
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 11
- 238000004080 punching Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229920006395 saturated elastomer Polymers 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
A portable voltage and current detection device for a current transformer relates to the composite error test technology of the current transformer, so as to solve the problem that on-site test is not conveniently carried out by the existing composite error test device for the current transformer. The portable voltage and current detection device for the current transformer comprises an alternating current/direct current variable frequency power supply (1), a current measuring circuit (2), a voltage measuring circuit (3), a data acquisition circuit (4), two power supply input ends (6), two analog input and variable frequency power supply output terminals (7), an isolated rectification power supply (8), a current output terminal (9) and a voltage output terminal (10). According to the device, a built-in alternating current/direct current variable frequency power supply or an external power supply can be used for providing low-frequency voltage according to the need, a voltage-boosting device or a current-boosting device are not needed to be equipped, the use is convenient, on-site test is facilitated, and the device is suitable for the composite error test for the current transformer with each voltage grade.
Description
Technical field
The utility model relates to methods of composite errors on current transformer measuring technology.
Background technology
The combination misalignment of current transformer directly affects the reliability of relay protection action, in GB/T14285-2006 relay protection and automatic safety device technical regulation, stipulates: under steady short-circuit current, accurately limit coefficient or excitation property (containing saturated flex point) should be able to meet the requirement of connect protective device reliable in action row to current transformer band acturl sencondaryload.
Current transformer is saturated is the major reason that causes at present microcomputer protective relay device incorrect operation.Protection requires under certain short-circuit current, and current transformer error is no more than setting, and error comprises ratio, phase differential and combination misalignment.For cored current transformer, the principal element that forms error is non-linear exciter characteristic and the degree of saturation of iron core.It is saturated saturated with transient state that current transformer saturated is divided into stable state.Stable state is saturated to be caused by large capacity short circuit stable state symmetrical current; mainly because primary current value is too large; having entered the full current transformer of current transformer is the intermediary that the various protective devices of electric system obtain primary system information; along with system is constantly to the development of the large capacity direction of UHV (ultra-high voltage); the problem that transformer iron core is saturated is day by day serious; once the saturated error of current transformer can increase the coverage of the incorrect operation expansion accident that causes relay protection greatly, the combination misalignment of measuring current mutual inductor has become the important process that improves system safety operation.
Although the volt-ampere characteristic of now widely used current transformer tester energy measuring current mutual inductor, need add high voltage, now will separately join stepup transformer, current lifting device, is not easy to carry out at the scene the test of current transformer.Therefore design meet the voltammetric characteristic measuring of current transformer and be suitable for using at the scene, portable proving installation highly significant.
Utility model content
The purpose of this utility model is to survey in order to solve existing methods of composite errors on current transformer the problem that device is not easy to test at the scene, and a kind of portable type current transformer voltage and current sensing means are provided.
A kind of portable type current transformer voltage described in the utility model and current sensing means comprise alternating current-direct current variable-frequency power sources 1, current measurement circuit 2, tension measuring circuit 3, data acquisition circuit 4, two power access ends 6, two analog inputs and variable-frequency power sources lead-out terminal 7, isolation rectification power supply 8, current output terminal 9 and Voltage-output terminal 10, two electric output terminals of described alternating current-direct current variable-frequency power sources 1 connect respectively two power access ends 6, two analog inputs and variable-frequency power sources lead-out terminal 7 are respectively used to connect the two ends of tested current transformer, the electrical input of current measurement circuit 2 and electric output terminal are connected respectively a power access end 6 and analog input and variable-frequency power sources lead-out terminal 7, the current signal input end of the current signal output end connection data Acquisition Circuit 4 of current measurement circuit 2, another power access end 6 connects another analog input and variable-frequency power sources lead-out terminal 7, the two ends of tension measuring circuit 3 connect respectively two analog inputs and variable-frequency power sources lead-out terminal 7, the voltage signal input end of the voltage signal output end connection data Acquisition Circuit 4 of tension measuring circuit 3, the current signal output end of described data acquisition circuit 4 is connected respectively current output terminal 9 and Voltage-output terminal 10 with voltage signal output end, isolation rectification power supply 8 is for to current measurement circuit 2, tension measuring circuit 3 and data acquisition circuit 4 provide working power.
The data acquisition circuit 4 of a kind of portable type current transformer voltage described in the utility model and current sensing means comprises current acquisition card 11, voltage acquisition card 12 and GPS and Big Dipper plesichronous circuit 13, the current signal input end of described current acquisition card 11 and current signal output end are respectively current signal input end and the current signal output end of data acquisition circuit 4, the voltage signal input end of voltage acquisition card 12 and voltage signal output end are respectively voltage signal input end and the voltage signal output end of data acquisition circuit 4, two sampling pulse control signal output terminals of GPS and Big Dipper plesichronous circuit 13 connect respectively the sampling pulse control signal input end of current acquisition card 11 and the sampling pulse control signal input end of voltage acquisition card 12.
A kind of portable type current transformer voltage described in the utility model and current sensing means also comprise photoelectric isolating circuit 5, the current signal output end of data acquisition circuit 4 connects current output terminal 9 by described photoelectric isolating circuit 5, and the current signal output end of data acquisition circuit 4 is connected Voltage-output terminal 10 with voltage signal output end by described photoelectric isolating circuit 5.
A kind of portable type current transformer voltage described in the utility model and current sensing means are in use, user choice for use carries as required alternating current-direct current variable-frequency power sources 1 or external power source provide low-frequency voltage, do not need to be equipped with stepup transformer and current lifting device, easy to use, be convenient to carry out on-the-spot test; By current measurement circuit 2 and tension measuring circuit 3, measure the voltage and current of current transformer; GPS and Big Dipper plesichronous circuit 13 receives GPS and Big Dipper pps pulse per second signals, guarantees synchronizeing of voltage sample and current sample, improved the accuracy of measurement; The current data recording and voltage data are sent to external data treatment facility by current output terminal 9 and Voltage-output terminal 10 respectively, and external data treatment facility obtains methods of composite errors on current transformer after current data and voltage data are processed.
Accompanying drawing explanation
Fig. 1 is a kind of portable type current transformer voltage described in the utility model and current sensing means theory diagram;
Fig. 2 is the theory diagram of data acquisition circuit.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, a kind of portable type current transformer voltage and current sensing means described in present embodiment comprise alternating current-direct current variable-frequency power sources 1, current measurement circuit 2, tension measuring circuit 3, data acquisition circuit 4, two power access ends 6, two analog inputs and variable-frequency power sources lead-out terminal 7, isolation rectification power supply 8, current output terminal 9 and Voltage-output terminal 10, two electric output terminals of described alternating current-direct current variable-frequency power sources 1 connect respectively two power access ends 6, two analog inputs and variable-frequency power sources lead-out terminal 7 are respectively used to connect the two ends of tested current transformer, the electrical input of current measurement circuit 2 and electric output terminal are connected respectively a power access end 6 and analog input and variable-frequency power sources lead-out terminal 7, the current signal input end of the current signal output end connection data Acquisition Circuit 4 of current measurement circuit 2, another power access end 6 connects another analog input and variable-frequency power sources lead-out terminal 7, the two ends of tension measuring circuit 3 connect respectively two analog inputs and variable-frequency power sources lead-out terminal 7, the voltage signal input end of the voltage signal output end connection data Acquisition Circuit 4 of tension measuring circuit 3, the current signal output end of described data acquisition circuit 4 is connected respectively current output terminal 9 and Voltage-output terminal 10 with voltage signal output end, isolation rectification power supply 8 is for to current measurement circuit 2, tension measuring circuit 3 and data acquisition circuit 4 provide working power.
A kind of portable type current transformer voltage described in present embodiment and current sensing means in use, are connected current output terminal 9 and Voltage-output terminal 10 respectively current signal input end and the voltage signal input end of external data treatment facility.Device is provided with power access end 10, and alternating current-direct current variable-frequency power sources 1 or external power source that user can optionally access device carries as required provide low-frequency voltage, do not need to be equipped with stepup transformer and current lifting device, are convenient to execute-in-place.The volume of alternating current-direct current variable-frequency power sources 1 is small and exquisite, and output voltage and frequency adjustable extent are larger.For meeting different current transformer test needs, alternating current-direct current variable-frequency power sources 1 can also be exported direct current.Described device has 1 road analog input and variable-frequency power sources lead-out terminal 11, can realize the measurement of voltage, electric current and frequency, and the voltage of device output, current signal are inputted from the secondary side of current transformer.Adopt isolation rectification power supply 9 for whole device provides power supply, whole device and externally fed power supply are carried out to electromagnetic isolation, avoid the noise jamming of power supply.Low-frequency power and current measurement circuit 2 and tension measuring circuit 3 can guarantee measuring accuracy, can be widely used in the methods of composite errors on current transformer test of each electric pressure.
Embodiment two: present embodiment is described in conjunction with Fig. 1 and Fig. 2, a kind of portable type current transformer voltage described in present embodiment and embodiment one and the difference of current sensing means are: described data acquisition circuit 4 comprises current acquisition card 11, voltage acquisition card 12 and GPS and Big Dipper plesichronous circuit 13, the current signal input end of described current acquisition card 11 and current signal output end are respectively current signal input end and the current signal output end of data acquisition circuit 4, the voltage signal input end of voltage acquisition card 12 and voltage signal output end are respectively voltage signal input end and the voltage signal output end of data acquisition circuit 4, two sampling pulse control signal output terminals of GPS and Big Dipper plesichronous circuit 13 connect respectively the sampling pulse control signal input end of current acquisition card 11 and the sampling pulse control signal input end of voltage acquisition card 12.
In order to realize the synchronized sampling of current acquisition card in data acquisition circuit 4 12 and voltage acquisition card 13; the built-in GPS of data acquisition circuit 4 and Big Dipper plesichronous circuit 13; this module can receive the pps pulse per second signal of GPS and the Big Dipper; the sampling pulse signal that guarantees data acquisition circuit 4 is per second interior by synchronous 1 time of the pps pulse per second signal of GPS and Big Dipper plesichronous circuit 13; this is conducive to system stability analysis and protection action characteristic analysis, also can guarantee the degree of accuracy of test result.
Embodiment three: present embodiment is described in conjunction with Fig. 1, a kind of portable type current transformer voltage described in present embodiment and embodiment one or two and the difference of current sensing means are: it also comprises photoelectric isolating circuit 5, the current signal output end of data acquisition circuit 4 connects current output terminal 9 by described photoelectric isolating circuit 5, and the current signal output end of data acquisition circuit 4 is connected Voltage-output terminal 10 with voltage signal output end by described photoelectric isolating circuit 5.
Photoelectric isolating circuit 5 carries out electricity by image data and turns light and light and turn electricity operation, for realizing the isolated from power of electric signal.The present embodiment photoelectric isolating circuit 5 of connecting between data acquisition circuit 4 and external data treatment facility, the signal transmitting is realized to isolation, effectively the powerful devices such as the weak electric signal of external data treatment facility and data acquisition circuit 4, tested current transformer are realized and being isolated, the impact that the work that prevents high-power parts is transmitted weak electric signal, has ensured the safe operation of external data treatment facility.
Embodiment four: in conjunction with Fig. 1, present embodiment is described, a kind of portable type current transformer voltage described in present embodiment and embodiment one or two and the difference of current sensing means are: described current measurement circuit 2 adopts SFI-4 punching current transformers to realize.
Embodiment five: in conjunction with Fig. 1, present embodiment is described, a kind of portable type current transformer voltage described in present embodiment and embodiment one or two and the difference of current sensing means are: described tension measuring circuit 3 adopts S type alternating voltage isolation sensors to realize.
Described S type alternating voltage isolation sensor utilizes electromagnetic induction principle, induction type input, and precision is high, low in energy consumption, it is little to drift about, and good stability, is particularly suitable for the measurement of power frequency tremendously low frequency voltage parameter.
Claims (5)
1. a portable type current transformer voltage and current sensing means, it is characterized in that: it comprises alternating current-direct current variable-frequency power sources (1), current measurement circuit (2), tension measuring circuit (3), data acquisition circuit (4), two power access ends (6), two analog inputs and variable-frequency power sources lead-out terminal (7), isolation rectification power supply (8), current output terminal (9) and Voltage-output terminal (10), two electric output terminals of described alternating current-direct current variable-frequency power sources (1) connect respectively two power access ends (6), two analog inputs and variable-frequency power sources lead-out terminal (7) are respectively used to connect the two ends of tested current transformer, the electrical input of current measurement circuit (2) and electric output terminal are connected respectively a power access end (6) and analog input and variable-frequency power sources lead-out terminal (7), the current signal input end of the current signal output end connection data Acquisition Circuit (4) of current measurement circuit (2), another power access end (6) connects another analog input and variable-frequency power sources lead-out terminal (7), the two ends of tension measuring circuit (3) connect respectively two analog inputs and variable-frequency power sources lead-out terminal (7), the voltage signal input end of the voltage signal output end connection data Acquisition Circuit (4) of tension measuring circuit (3), the current signal output end of described data acquisition circuit (4) is connected respectively current output terminal (9) and Voltage-output terminal (10) with voltage signal output end, isolation rectification power supply (8) is for to current measurement circuit (2), tension measuring circuit (3) and data acquisition circuit (4)) working power is provided.
2. a kind of portable type current transformer voltage according to claim 1 and current sensing means, it is characterized in that: described data acquisition circuit (4) comprises current acquisition card (11), voltage acquisition card (12) and GPS and Big Dipper plesichronous circuit (13), the current signal input end of described current acquisition card (11) and current signal output end are respectively current signal input end and the current signal output end of data acquisition circuit (4), the voltage signal input end of voltage acquisition card (12) and voltage signal output end are respectively voltage signal input end and the voltage signal output end of data acquisition circuit (4), two sampling pulse control signal output terminals of GPS and Big Dipper plesichronous circuit (13) connect respectively the sampling pulse control signal input end of current acquisition card (11) and the sampling pulse control signal input end of voltage acquisition card (12).
3. a kind of portable type current transformer voltage according to claim 1 and 2 and current sensing means, it is characterized in that: it also comprises photoelectric isolating circuit (5), the current signal output end of data acquisition circuit (4) connects current output terminal (9) by described photoelectric isolating circuit (5), and the current signal output end of data acquisition circuit (4) is connected Voltage-output terminal (10) with voltage signal output end by described photoelectric isolating circuit (5).
4. a kind of portable type current transformer voltage according to claim 1 and 2 and current sensing means, is characterized in that: described current measurement circuit (2) adopts SFI-4 punching current transformer to realize.
5. a kind of portable type current transformer voltage according to claim 1 and 2 and current sensing means, is characterized in that: described tension measuring circuit (3) adopts S type alternating voltage isolation sensor to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320574060.5U CN203422465U (en) | 2013-09-16 | 2013-09-16 | Portable voltage and current detection device for current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320574060.5U CN203422465U (en) | 2013-09-16 | 2013-09-16 | Portable voltage and current detection device for current transformer |
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| CN203422465U true CN203422465U (en) | 2014-02-05 |
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| CN201320574060.5U Expired - Fee Related CN203422465U (en) | 2013-09-16 | 2013-09-16 | Portable voltage and current detection device for current transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11210776B2 (en) | 2015-10-23 | 2021-12-28 | Fluke Corporation | Imaging tool for vibration and/or misalignment analysis |
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2013
- 2013-09-16 CN CN201320574060.5U patent/CN203422465U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11210776B2 (en) | 2015-10-23 | 2021-12-28 | Fluke Corporation | Imaging tool for vibration and/or misalignment analysis |
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| CF01 | Termination of patent right due to non-payment of annual fee |