CN106771837B - Remote polarity tester for current transformer - Google Patents
Remote polarity tester for current transformer Download PDFInfo
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- CN106771837B CN106771837B CN201611205292.8A CN201611205292A CN106771837B CN 106771837 B CN106771837 B CN 106771837B CN 201611205292 A CN201611205292 A CN 201611205292A CN 106771837 B CN106771837 B CN 106771837B
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- polarity
- rectangular wave
- current transformer
- module
- wave voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention provides a remote polarity tester for a current transformer, which comprises a rectangular wave voltage signal generator connected to the primary side of the current transformer and a polarity test monitor connected to the secondary side. Rectangular wave voltage signal generator outputs low level durationGreater than 3 times high level durationBased on electromagnetic induction principle, the secondary winding induces pulse current, and the polarity test monitor performs digital-to-analog conversion and sampling (sampling period) Then the sampling data is recorded and analyzed by a data analysis and judgment module CPU, and the maximum positive peak time and the maximum negative peak time are recordedData analysis was then performed: if it isThen it is determined to be minus polarity ("homonymous terminal"); if it isThen it is determined to be plus-polarized ("synonym side"). The polarity judgment principle of the tester is simple, the testing accuracy is high, the tester is portable and easy to carry together, the testing efficiency is high, and the tester plays a good role in time and labor saving.
Description
Technical Field
The invention relates to the field of testing of power equipment, in particular to a remote polarity tester for a current transformer.
Background
Aiming at the current transformer after the wiring is newly installed, transformed or changed, the relay protection of the power system and the electric test profession must carry out effective simulation verification. The polarity test is one of the important tests of simulation verification, and can verify the correctness of equipment and loop wiring and ensure the safe operation of electrical equipment. The polarity test method generally adopts a direct current method, a direct current power supply is connected to the primary side of a current transformer, short-time (instantaneous) on-off is realized through a switch, an electromagnetic mutation quantity is generated by a primary side coil, the secondary side induces the electromagnetic mutation quantity, the pointer deflection dynamic scale and direction of a pointer ammeter connected to the secondary side are observed, and finally whether the polarity of the transformer is correct is determined.
Professional polarity test work in the transformer substation needs to work at the same time at two working points, wherein the primary side operation point is an outdoor high-voltage field or a GIS high-voltage room, the secondary side observation point is positioned in a main control room, and the two working points are often far away or have wall shielding. In the traditional test mode, the primary side tests the operation point, manually controls the power on-off switch, and the phenomena of irregular contact and off time, asynchronous outdoor test operation and indoor test observation and the like often occur, so that the test result is unclear and the test is required to be repeated. Therefore, the polarity test work is passive, the efficiency is low, repeated work is sometimes caused by the reasons, and even test conclusion errors occur, so that hidden danger is buried for the safe operation of equipment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a remote polarity tester for a current transformer.
The invention is realized by the following technical scheme:
a remote polarity tester for a current transformer comprises a rectangular wave voltage signal generator and a polarity test monitor. The rectangular wave voltage signal generator comprises a power supply module and a rectangular wave generation module, and is connected with the primary side of the current transformer and used for generating periodic rectangular wave voltage at the primary side. The polarity test monitor comprises a power supply module, a digital-to-analog conversion module, a sampling module, a data analysis processing module and a result display and buzzing module, and is connected with the secondary side of the current transformer for analyzing and displaying the polarity test result.
Further, in the remote current transformer polarity tester, the rectangular wave voltage signal generator is in the shape of an insulating plastic shell cuboid, and the positive end face of the rectangular wave voltage signal generator is provided with a voltage output socket P1/P2, an indicator lamp, a power supply on-off button, an indicator lamp, a charging socket, an indicator lamp and a 5V/10V switching knob; the voltage output sockets P1/P2 are respectively connected to two ports on the primary side of the current transformer through test lines.
In the rectangular wave voltage signal generator, the power supply module comprises a storage battery and a charge-discharge control circuit board, wherein the storage battery is formed by connecting 8 rechargeable 1.5V dry batteries in series, and the charge-discharge control circuit board comprises a DC/DC voltage conversion circuit which can output 5V and 10V voltages so as to realize adjustable output voltage.
In the square wave voltage signal generator, the square wave generating module forms a multivibrator loop through an integrated chip NE555 timer and peripheral resistance and capacitance to realize square wave voltage output, and the resistance and capacitance loop determines the square wave frequency and high level duration timeLow level duration->；
Wherein the high level duration：/>；
Wherein the low level duration：/>；
In the rectangular wave generating module, the low level durationA high level duration of more than three times +.>。
Further, in the remote polarity tester for the current transformer, the polarity test monitor is in the shape of an insulating plastic shell cuboid, the positive end face of the polarity test monitor is provided with a current input socket S1/S2, an indicator lamp, a power-on/off button, an indicator lamp, a charging socket, an indicator lamp, a +/-polarity indicator lamp and a buzzer port, and the current input socket S1/S2 is respectively connected to two ports on the secondary side of the current transformer through test lines.
In the above-mentioned polarity test monitor, the power module is formed by connecting 8 rechargeable 1.5V dry batteries in series, the D/A conversion module converts analog data of pulse current signals induced in the test loop into digital data, the sampling loop collects the current data, and the sampling time is the same as that of the sampling loopThe data analysis processing module obtains a plurality of continuous maximum positive peak time and maximum negative peak time, namely +.>Or->；
Wherein if itThen determine to be polarity-reduced ("homonymousEnd ");
if it isThen it is determined to be plus-polarized ("synonym side").
Further, in the above-mentioned polarity test monitor, if it is determined that the polarity is reduced, the "-" polarity indicator light is normally on, and the buzzer sounds at high frequency; if the polarity is judged to be added, the "+" polarity indicator lamp is always on, and the buzzer sounds at a low frequency.
The invention has the beneficial effects that: the device is portable and easy to carry, the judging principle is simplified, the polarity test of the current transformer can be accurately carried out, and the working efficiency is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating the use of the present invention.
FIG. 2 is a schematic diagram of the structure of the present invention.
Fig. 3 is a schematic diagram of a rectangular wave voltage signal generator according to the present invention.
Fig. 4 is a waveform diagram of output voltage and induced current of a primary winding and a secondary winding of the current transformer according to the present invention.
In the figure, a rectangular wave voltage signal generator 1, a polarity test monitor 2, a current transformer 3, a voltage output socket P1/P2 4, a voltage output indicator lamp 5, a voltage gear knob 6, a charging hole I7, a working indicator lamp I8, a charging indicator lamp I9, a double-throw working switch button I10, a polarity indicator lamp 11"+/-", a buzzer 12, a current input socket S1/S2 13, a current input indicator lamp 14, a working indicator lamp II15, a charging indicator lamp II 16, a double-throw working switch button II17, a charging hole II 18, a test connecting wire 19 and a protection resistor 20.
Detailed Description
The figure shows an embodiment of the invention, which comprises a rectangular wave voltage signal generator 1, a polarity test monitor 2, a current transformer 3 and four test connection wires 19, as shown in fig. 1. Two test connection lines 19 are connected to the rectangular wave voltage signal generator 1 through the voltage output socket (P1/P2) 4, and two test connection lines 19 are connected to the polarity test monitor 2 through the current input socket (S1/S2) 13. The rectangular wave voltage signal generator 1 is powered on through the double-throw working switch button I10, the working indicator lamp I8 is on at the moment, and the voltage value (5V/10V) is selected by rotating the voltage gear knob 6. The polarity test monitor 2 is turned on by the double throw operation switch button II17, at which time the operation indicator lamp II15 is turned on, and the "+/-" polarity indicator lamp 11 is observed, and the beeping of the buzzer 12 is noted.
As shown in fig. 2, the rectangular wave voltage signal generator comprises a storage battery, a management module and a rectangular wave generation module; the polarity test monitor comprises a storage battery and management module, a display and buzzing module, a CPU data processing and analysis judging module, a sampling module and an A/D conversion module.
As shown in FIG. 3, the rectangular wave generating module consists of an NE555 timer and a resistor、/>And capacitance->、/>The components form a multivibrator circuit, and rectangular wave voltage is output: high level duration +.>Low level duration +.>And->。
The output period of the rectangular wave voltage signal generator 1 isRectangular wave voltage is connected to a wiring port of a primary winding of the current transformer 3, the current transformer 3 generates electromagnetic induction, a secondary winding induces positive and negative pulse current signals, a polarity test monitor 2 is connected to a wiring terminal of the secondary winding of the current transformer 3 through a test wiring 19, digital-to-analog conversion is carried out on the current signals through an A/D conversion module, and then sampling (sampling period->) Then the CPU data processing analysis and judgment module records and analyzes the sampled data, and records continuous maximum positive peak time and maximum negative peak timeOr->Data analysis was then performed: if it isThen it is determined to be minus polarity ("homonymous terminal"); if->Then it is determined to be plus-polarized ("synonym side"). The waveforms of the output voltage and the induced current of the primary winding and the secondary winding of the current transformer are shown in fig. 4.
The method for measuring the polarity of the current transformer by using the remote polarity tester of the current transformer comprises the following steps:
firstly, dividing testers into two groups, wherein one group carries a square wave voltage signal generator to go to a primary side test end of a current transformer, and the other group carries a polarity test monitor to go to a main control room;
then, connecting a voltage output socket P1/P2 of the square wave voltage signal generator to a primary side winding outgoing line of the current transformer through a test wire;
then, connecting the current input socket S1/S2 of the polarity test monitor to the outgoing line path of the secondary side winding of the current transformer through a test wire, namely, the output terminal of the current transformer in the protection screen of the main control room;
and finally, two groups of wiring are completed, a working power supply of the square wave voltage signal generator is turned on, a voltage value (5V/10V) is selected, a polarity test monitor is turned on, and a polarity indicator lamp is watched.
Claims (3)
1. The utility model provides a long-range polarity tester of current transformer which characterized in that: the device comprises a rectangular wave voltage signal generator and a polarity test monitor; the rectangular wave voltage signal generator is connected with the primary side of the current transformer and is used for generating periodic rectangular wave voltage at the primary side; the polarity test monitor is connected with the secondary side of the current transformer and is used for analyzing and displaying a polarity test result; wherein the rectangular wave voltage signal generator generates a low level with duration t 2 The duration of the high level is t 1 And t is 2 ＞3t 1 The rectangular wave voltage signal generator comprises a power supply module and a rectangular wave generation module, wherein the rectangular wave generation module comprises an integrated chip NE555 timer, peripheral resistors R1, R2 and R3 and a capacitor C to form a multivibrator circuit, so that rectangular wave voltage output is realized, and the resistor-capacitor circuit determines rectangular wave frequency and high level duration t 1 And low level duration t 2 ，t 1 ＝(R 1 +R' 2 )Cln2，t 1 ＝(R 3 +R" 2 ) Cln2; the polarity test monitor comprises a power supply module, a digital-to-analog conversion module, a sampling module, a data analysis processing module, a +/-polarity indicator lamp and a buzzer module; the digital-to-analog conversion module converts analog data of pulse current signals induced in the test loop into digital quantity, the sampling module acquires the current data, and the sampling time t is less than t 1 The data analysis processing module obtains a plurality of continuous maximum positive peak time and maximum negative peak time through data sampling, namelyIf->The polarity is judged to be reduced, and at the moment, the polarity indicator lamp is always on, and the buzzer module sounds at high frequency; if->The polarity is judged to be added, and the "+" polarity indicator lamp is always on at the moment, and the buzzer module sounds at a low frequency.
2. The current transformer remote polarity tester of claim 1, wherein: the positive end face of the rectangular wave voltage signal generator is provided with a voltage output socket P1/P2, an indicator lamp, a power supply on-off button, an indicator lamp, a charging socket, an indicator lamp and a 5V/10V switching knob, wherein the voltage output socket P1/P2 is respectively connected to two ports on the primary side of the current transformer through a test circuit.
3. The current transformer remote polarity tester of claim 1, wherein: the positive terminal surface of polarity test monitor is provided with electric current input socket S1/S2 and pilot lamp, power off button and pilot lamp, charging socket and pilot lamp, +/-polarity pilot lamp, buzzer, electric current input socket S1/S2 connects to current transformer secondary side both ends mouth respectively through test line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205292.8A CN106771837B (en) | 2016-12-23 | 2016-12-23 | Remote polarity tester for current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205292.8A CN106771837B (en) | 2016-12-23 | 2016-12-23 | Remote polarity tester for current transformer |
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| Publication Number | Publication Date |
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| CN106771837A CN106771837A (en) | 2017-05-31 |
| CN106771837B true CN106771837B (en) | 2023-07-18 |
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| CN201611205292.8A Active CN106771837B (en) | 2016-12-23 | 2016-12-23 | Remote polarity tester for current transformer |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643505A (en) * | 2017-10-11 | 2018-01-30 | 国网宁夏电力公司吴忠供电公司 | 110kV current transformer integrated form polarity test devices |
| CN108181545B (en) * | 2017-12-29 | 2020-10-27 | 国家电网公司 | Polarity test circuit for current transformer |
| CN108732459A (en) * | 2018-03-23 | 2018-11-02 | 国网上海市电力公司 | A kind of current transformer polarity testing method |
| CN110244177A (en) * | 2019-07-30 | 2019-09-17 | 广东电网有限责任公司 | A kind of CT polarity tester and test method based on waveform differentiation |
| CN110579676A (en) * | 2019-09-19 | 2019-12-17 | 国网辽宁省电力有限公司营口供电公司 | Automatic polarity detection device |
| CN112147549A (en) * | 2020-09-28 | 2020-12-29 | 广东电网有限责任公司肇庆供电局 | Transformer substation current transformer polarity testing device based on single chip microcomputer |
| CN112327215A (en) * | 2020-10-31 | 2021-02-05 | 贵州电网有限责任公司 | Portable current transformer polarity calibration equipment |
| CN114814658B (en) * | 2022-05-07 | 2024-02-06 | 山东送变电工程有限公司 | Timing polarity tester |
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| CN101504448A (en) * | 2009-03-13 | 2009-08-12 | 江苏省电力公司常州供电公司 | Integral polarity test method for current mutual inductor |
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| WO2016026231A1 (en) * | 2014-08-22 | 2016-02-25 | 江苏省电力公司常州供电公司 | Intelligent polarity detection apparatus and method for four-star type voltage transformer |
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2016
- 2016-12-23 CN CN201611205292.8A patent/CN106771837B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101504448A (en) * | 2009-03-13 | 2009-08-12 | 江苏省电力公司常州供电公司 | Integral polarity test method for current mutual inductor |
| CN202548269U (en) * | 2012-02-16 | 2012-11-21 | 尚庆功 | Polarity discriminating gear for electromagnetic induction coil |
| CN103454554A (en) * | 2013-08-30 | 2013-12-18 | 广东威恒输变电工程有限公司 | Polarity tester for current transformer |
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