CN217060483U - Mutual inductor secondary loop tester for protection device - Google Patents
Mutual inductor secondary loop tester for protection device Download PDFInfo
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- CN217060483U CN217060483U CN202220266659.1U CN202220266659U CN217060483U CN 217060483 U CN217060483 U CN 217060483U CN 202220266659 U CN202220266659 U CN 202220266659U CN 217060483 U CN217060483 U CN 217060483U
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Abstract
The utility model discloses a mutual-inductor secondary circuit tester for protection device, including three single-phase voltage current source and a test terminal, test terminal passes through the different single-phase voltage current source of wireless communication synchronous connection multiple spot. The utility model discloses a test terminal sends broadcast synchronizing signal, and three single-phase voltage current source receives behind the broadcast synchronizing signal according to number synchronous adjustment voltage of itself, electric current, frequency and correspond the phase output, responds measured output amplitude in turn according to the number simultaneously, carries out simultaneously the check of polarity, transformation ratio, phase sequence, the break-make of a plurality of mutual-inductor secondary circuit wiring.
Description
Technical Field
The utility model belongs to the relay protection field, concretely relates to a mutual-inductor secondary circuit tester for protection device.
Background
The correct action of the protection device plays an important role in guaranteeing the safe operation of the power system, and the correctness and the integrity of a secondary circuit must be guaranteed when the protection device of the power equipment of the transformer substation is newly installed; and the polarity, wiring and other tests of the secondary circuit are required after power failure maintenance. Errors in the polarity, wiring and the like of the mutual inductor can cause misoperation of the protection device, and larger power accidents are caused.
When a traditional Current Transformer (CT) secondary circuit detection method is used for inspection, live operation is needed for a period of time, the polarity and phase relation test is usually carried out on a current circuit by using load current in an operation state, and transformation ratio and wiring in a power failure state cannot be measured. In the prior art, the wiring of a secondary loop is required to be ensured to be correct when the transformation ratio is measured, and the wiring checking equipment commonly used for wiring checking is complex in operation, limited by checking conditions and low in human analysis efficiency. The tester checked at present is single in function, difficult to realize multi-loop automatic testing of polarity, phase sequence and transformation ratio of the current transformer, long in distance between field CTs (computed tomography) and up to 20-30 meters, and adopts wire connection for testing, so that the tester outputs overlength wires once, overlarge resistance, small output current and inconvenient use.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a mutual-inductor secondary circuit tester for protection device to the not enough of protection device's current transformer secondary circuit wiring test existence under new dress or the power failure state to solve above-mentioned technical defect, realize the degree of accuracy of remote a plurality of CT synchronous automatic test, assurance test.
Realize the utility model discloses the technical solution of purpose: the utility model provides a mutual-inductor secondary circuit tester for protection device, including three single-phase voltage current source and a test terminal, test terminal passes through the single-phase voltage current source of the three different return circuits of wireless communication synchronous connection, test terminal sends broadcast synchronizing signal, three single-phase voltage current source receives behind the broadcast synchronizing signal according to number synchronous adjustment voltage of itself, current frequency and corresponding phase output, respond measured output amplitude according to the number in turn simultaneously, carry out the polarity of a plurality of mutual-inductor secondary circuit wiring in step, the transformation ratio, the phase sequence, the checking of break-make.
The utility model comprises a lithium battery power circuit, a power conversion circuit, a charging circuit, an inverter circuit, a communication unit, a processor, a single-phase voltage output unit and a single-phase current output unit; the three single-phase voltage current sources generate power frequency alternating voltage and current signals for the mutual inductor test, and the signals are applied to one-time test of different mutual inductors.
Specifically, the utility model single-phase voltage current source lithium battery power circuit is connected with a power conversion circuit for voltage regulation and power supply to other internal units; the inverter circuit is connected with the processor, SPWM wave drive inversion and processor control are carried out, a direct-current power supply output by the direct-current circuit is converted into an alternating-current power supply with the frequency and the voltage capable of being adjusted at will under the control of the processor, the single-phase voltage output unit and the single-phase current output unit are connected, and the tested power frequency alternating-current voltage and alternating-current signals are output.
The utility model discloses test terminal includes lithium battery power supply circuit, power conversion circuit, charging circuit, three phase current input measuring circuit, three phase voltage input measuring circuit, communication unit, treater, display, measures the secondary side electric current size, once surveys data with the signal source that obtains and carries out contrastive analysis, checks whether polarity, transformation ratio, phase sequence, the break-make of whole protection device secondary circuit wiring are correct.
Specifically, the three-phase current input measuring circuit of the utility model is connected with the high-precision current transformer, the three phases are independently connected, a secondary current loop is not required to be opened, and the size of a secondary current signal is directly measured; the display structure selects high resolution, true color and touch display, data such as transformation ratio, polarity and the like are displayed in a table form, the wiring result corresponds to a clear wiring analysis schematic diagram, and the phase relation is visually displayed by adopting a vector diagram.
As a preferred technical scheme: the utility model discloses three single-phase voltage current source and a test terminal communication unit adopt wireless communication to connect, realize the multiple spot synchronous test.
Compared with the prior art, the utility model the effect that is showing that reaches is: (1) the single-phase voltage current source is connected at one time, multi-point broadcasting is synchronous, wireless communication is connected with the test terminal, the polarity, the transformation ratio, the phase sequence and the on-off of the secondary circuit connection of the mutual inductor of the protection device are checked at the same time, and the working efficiency is improved; (2) the remote communication is realized, and the requirement of primary and secondary distance measurement of all protection device mutual inductors is met.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is the schematic diagram of the structure of the tester.
Fig. 2 is the structure schematic diagram of the single-phase voltage current source of the present invention.
Fig. 3 is the structure diagram of the test terminal of the present invention.
Fig. 4 is the structural schematic diagram of the single-phase voltage current source system of the present invention.
Fig. 5 is the structure diagram of the test terminal system of the present invention.
Detailed Description
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The utility model provides a mutual-inductor secondary circuit tester for protection device, refer to fig. 1 and explain the utility model discloses the component structure of tester, including S11 single-phase voltage current source 1, S12 single-phase voltage current source 2, S13 single-phase voltage current source 3 three single-phase voltage current source altogether and S21 a test terminal among the component structure, S11 single-phase voltage current source 1, S12 single-phase voltage current source 12, S13 single-phase voltage current source 3 mutually independent output exchanges (AC) signal, S11 single-phase voltage current source 1, S12 single-phase voltage current source 2, S13 single-phase voltage current source 3 connects S21 test terminal, the connected mode is wireless communication, broadcast synchronous connection, realize a plurality of mutual-inductor synchronous tests.
Referring to fig. 2, the utility model discloses single-phase voltage current source structure includes 101 terminal interfaces, 101 terminal interfaces are as voltage output terminal interface and current output terminal interface, 102 current output return circuit inflow terminal, 103 voltage ground connection output terminal, 104 voltage drop test (I) and transformation ratio test (II) change over switch, 105 work pilot lamp, 106 alternating current signal control output switch, 107 charge pilot lamp, 108 charge interface, 109 communication antenna interface, 110 switch.
Referring to fig. 3, the utility model discloses test terminal structure includes 201A looks voltage input terminal, 202B looks voltage input terminal, 203C looks voltage input terminal, 204N looks voltage input terminal, 205A phase current input terminal, 206B looks current input terminal, 207C looks current input terminal, 208 work pilot lamp, 209 charge pilot lamp, 210 switch, 211 display screen, 212 interface, 213 communication antenna interface.
Referring to fig. 4, the structure of the single-phase voltage and current source system of the utility model comprises a 301 charging circuit, a 302 lithium battery power circuit, a 303 power conversion circuit, a 304 inverter circuit, a 305 processor, a 306 communication unit, a 307 single-phase voltage output unit, and a 308 single-phase current output unit;
referring to fig. 5, the utility model test terminal system structure includes 401 three-phase voltage input measuring circuit, 402 three-phase current input measuring circuit, 403 processor, 404 communication unit, 405 display, 406 charging circuit, 407 lithium battery power supply circuit, 408 power conversion circuit.
The utility model discloses a 301 charging circuit of single-phase voltage current source connects 302 lithium cell power supply circuit, 302 lithium cell power supply circuit connects 303 power conversion circuit, 303 power conversion circuit connects 304 inverter circuit, 303 power conversion circuit connects 305 the treater, 305 the treater connects 301 charging circuit, 306 communication unit, 307 single-phase voltage output unit, 308 single-phase current output unit are connected to the treater 305, 304 inverter circuit connects 307 single-phase voltage output unit and 308 single-phase current output unit; the charging interface 108 is connected with a charging circuit 301, the power switch 110 is connected with a lithium battery power circuit 302, the single-phase voltage output unit 307 is connected with the terminal interface 101 and the voltage grounding output terminal 103, the single-phase current output unit 308 is connected with the terminal interface 101 and the current output loop inflow terminal 102, and the communication unit 306 is connected with the communication antenna interface 109. The 110 power switch controls the power supply to start, and the voltage inside the system is regulated through the 303 power conversion circuit to supply power to other unit circuits; 302 lithium battery power supply current controls 303 power supply conversion circuit through 305 processor, 303 power supply conversion circuit in step-up/step-down circuit processing, send the direct current voltage signal outputted into 304 inverter circuit, 304 inverter circuit through drive circuit output SPWM wave to H bridge, H bridge invert direct current signal into alternating current signal outputted, connect to 307 single-phase voltage output unit and 308 single-phase current output unit, output power frequency alternating voltage signal and alternating current signal tested; the 106 alternating current signal control output switch is connected with an output signal and used for carrying out output control on the output signal, and the three single-phase voltage current sources generate signals for testing the mutual inductor and then apply the signals to one-time testing of different mutual inductors; the processor 305 controls 306 the communication unit to wirelessly transmit data with the test terminal of S21, and the connection 105 works to indicate the lamp to flash when the single-phase voltage current source works.
The utility model discloses test terminal voltage input is connected through 201A looks voltage input terminal, 202B looks voltage input terminal, 203C looks voltage input terminal and 204N looks voltage input terminal, and 401 three-phase voltage input measuring circuit is connected to 201A looks voltage input terminal, 202B looks voltage input terminal, 203C looks voltage input terminal and 204N looks voltage input terminal; the high-precision current transformer is connected with a current input, three phases are independently connected through a phase 205A current input terminal, a phase 206B current input terminal and a phase 207C current input terminal, and the phase 205A current input terminal, the phase 206B current input terminal and the phase 207C current input terminal are connected with a three-phase current input measuring circuit 402; the 401 three-phase voltage input measuring circuit and the 402 three-phase current input measuring circuit are connected with the 403 processor to measure the secondary side voltage and current, and the size of a secondary current signal is directly measured without opening a secondary current loop; the 403 processor is connected with the 404 communication unit, the 404 communication unit is connected with the 213 communication antenna interface, data transmission is carried out through wireless and single-phase voltage current sources to obtain primary side data of three single-phase voltage current sources, multi-loop synchronous test is carried out, comparison analysis is carried out on the primary side data and the secondary side data, whether the polarity, the transformation ratio, the phase sequence and the wiring of a secondary loop of the whole protection device are correct or not is checked, and the voltage drop test and the transformation ratio test correspond to 104 voltage drop test (I) and transformation ratio test (II) change-over switches connected with the single-phase voltage current sources for test switching; the 403 processor is connected with the 405 display, the 405 display is connected with the 211 display screen, the display structure uses the high resolution, true color and touch control display screen, the data of transformation ratio, polarity and the like are displayed in the form of a table, the wiring result corresponds to a clear analysis schematic diagram of the wiring, and the phase relationship is visually displayed by adopting a vector diagram; the 403 processor is connected with 406 a charging circuit, the 406 charging circuit is connected with 407 a lithium battery power supply circuit, the 407 lithium battery power supply circuit is connected with 408 a power supply conversion circuit, the 212 charging interface is connected with the 406 charging circuit, after the 210 power supply is started, power is supplied to each unit system through the 408 power supply conversion circuit, when the voltage of the power supply circuit is detected to be too low, the S21 test terminal starts charging, and the 209 charging indicator lamp is correspondingly lightened; and when the S21 test terminal works normally, the 208 work indicator lamp flickers.
The utility model discloses three single-phase voltage current source of S11, S12, S13 and S21 test terminal, install three single-phase voltage current source on-the-spot protection device' S different CT, be located different return circuits, guarantee output current amplitude and stability, make the single-phase voltage current source of S21 test terminal wireless communication synchronous connection multiple spot. The S21 test terminal sends out broadcast synchronizing signals, the three single-phase voltage current sources S11, S12 and S13 adjust voltage, current, frequency and corresponding phase output according to numbers after receiving the broadcast synchronizing signals, the measured output amplitude is responded in turn according to the numbers, and the S21 test terminal simultaneously checks the polarity, the transformation ratio, the phase sequence and the on-off of the wiring of the secondary circuits of the transformers according to the single-phase voltage current source data obtained by wireless communication.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A mutual-inductor secondary circuit tester for protection device which characterized in that includes: the testing terminal is synchronously connected with the single-phase voltage current sources of three different loops through wireless communication, and simultaneously checks the polarity, the transformation ratio, the phase sequence and the wiring of the secondary loops of the transformers;
the single-phase voltage current source comprises a lithium battery power supply circuit, a power supply conversion circuit, a charging circuit, an inverter circuit, a communication unit, a processor, a single-phase voltage output unit and a single-phase current output unit; the testing terminal comprises a lithium battery power supply circuit, a power supply conversion circuit, a charging circuit, a three-phase current input measuring circuit, a three-phase voltage input measuring circuit, a communication unit, a processor and a display.
2. The instrument transformer secondary circuit tester for the protection device as claimed in claim 1, wherein the single-phase voltage current source and the test terminal include a communication unit for wireless communication, the test terminal communication unit sends out a broadcast synchronization signal, the three single-phase voltage current sources receive the broadcast synchronization signal and then synchronously adjust voltage, current, frequency and corresponding phase output according to their numbers, and simultaneously check the polarity, transformation ratio, phase sequence and on-off of the wiring of the secondary circuits of the plurality of instrument transformers according to the numbers in turn in response to the measured output amplitude.
3. The instrument transformer secondary circuit tester for the protection device as claimed in claim 1, wherein three single-phase voltage current sources generate power frequency alternating current voltage and current signals for the instrument transformer test, and the signals are applied to the primary sides of the instrument transformers in different circuits.
4. The instrument transformer secondary circuit tester for the protection device as claimed in claim 1, wherein the test terminal three-phase current input measurement circuit is connected with a high-precision current transformer, the three phases are connected independently, the secondary current signal is directly measured without opening the secondary current circuit, and meanwhile, the secondary side voltage signal is directly connected to and measured to be compared with the obtained single-phase voltage current source primary measurement data for analysis, so that the polarity, transformation ratio, phase sequence and on-off of the protection device transformer secondary circuit connection are checked at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220266659.1U CN217060483U (en) | 2022-02-09 | 2022-02-09 | Mutual inductor secondary loop tester for protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220266659.1U CN217060483U (en) | 2022-02-09 | 2022-02-09 | Mutual inductor secondary loop tester for protection device |
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| CN217060483U true CN217060483U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220266659.1U Active CN217060483U (en) | 2022-02-09 | 2022-02-09 | Mutual inductor secondary loop tester for protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116482581A (en) * | 2023-06-20 | 2023-07-25 | 广东电网有限责任公司佛山供电局 | Transformer substation voltage transformer opening triangle voltage secondary circuit tester |
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2022
- 2022-02-09 CN CN202220266659.1U patent/CN217060483U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116482581A (en) * | 2023-06-20 | 2023-07-25 | 广东电网有限责任公司佛山供电局 | Transformer substation voltage transformer opening triangle voltage secondary circuit tester |
| CN116482581B (en) * | 2023-06-20 | 2023-11-14 | 广东电网有限责任公司佛山供电局 | Transformer substation voltage transformer opening triangle voltage secondary circuit tester |
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