CN108957380B - Development of transformation ratio and polarity test instrument of capacitor voltage transformer - Google Patents
Development of transformation ratio and polarity test instrument of capacitor voltage transformer Download PDFInfo
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- CN108957380B CN108957380B CN201810830300.0A CN201810830300A CN108957380B CN 108957380 B CN108957380 B CN 108957380B CN 201810830300 A CN201810830300 A CN 201810830300A CN 108957380 B CN108957380 B CN 108957380B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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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
Abstract
The invention provides an efficient and safe instrument special for the transformation ratio and polarity test of a capacitor voltage transformer. The instrument comprises a high-voltage output module and a voltage signal acquisition and calculation module; the high-voltage output module comprises a primary side boosting transformer and a high-voltage output divider resistance unit which are connected in parallel; the high-voltage output voltage-dividing resistor unit comprises a high-power high-voltage resistor and three high-precision wire-wound resistors; one end of the high-power high-voltage resistor is connected with the capacitor voltage transformer, and the other end of the high-power high-voltage resistor is connected with the high-precision wire-wound resistor in series; the three high-precision wire-wound resistors are connected in parallel, one end of each high-precision wire-wound resistor is grounded, and the other end of each high-precision wire-wound resistor is connected with a high-power high-voltage resistor in series and leads out a high-voltage-dividing output end. The development of the instrument fills the blank that no special instrument is used for testing the transformation ratio and the polarity of the capacitive voltage transformer, and has the advantages of simple and convenient work, safety, practicability, high working efficiency, strong noise resistance, low cost and the like.
Description
The technical field is as follows:
the invention relates to the field of electric power testing, in particular to a transformation ratio and polarity testing instrument for a capacitor voltage transformer.
Background art:
in recent years, with the continuous reformation and development of the power industry and the power grid technology in China, in order to ensure the fairness, justness and accurate specification of electric energy metering, the metering law in China stipulates that the field verification must be carried out on the mutual inductor regularly, so that the capacitance voltage mutual inductor has an increasingly greater role in gateway metering. At present, the integration level of on-site calibration equipment for a capacitive voltage transformer is not high, a disassembly and assembly type on-site calibration mode is mostly adopted, not only is the test equipment easily damaged, but also huge manpower and material resources are wasted, and in each time of on-site assembly, because the relative positions among complete equipment are different, the uncertainty of distribution parameters is increased, so that additional errors introduced by a measurement system are not fixed, and sometimes, the measurement result is seriously influenced, and even the judgment on the performance of a test article is influenced.
When the transformation ratio and polarity tests are carried out on the capacitor voltage transformer in a construction site, due to the lack of a special test instrument for the test project, the transformation ratio and polarity tests are usually carried out by using the following method: firstly, a dielectric loss instrument is used as an alternating current high-voltage excitation power supply, a high-voltage signal is output, a digital multimeter is used for secondary measurement in a voltage transformer, and the transformation ratio is tested; and then testing the polarity by using a battery pack and a pointer multimeter. When the method is used for carrying out the test, the problems of large error of test results, high danger in the test process, complicated test procedures, low test efficiency and the like exist. Although some domestic dielectric loss instruments have the function of testing the transformation ratio of the capacitor voltage transformer, the dielectric loss instrument can only perform the transformation ratio test of one secondary coil every time the voltage is boosted. The test process consumes more time, has low efficiency, and can not meet the test requirements of site safety and high efficiency. Furthermore, the apparatus cannot perform polarity detection when a transformation ratio test is performed. The utility model CN203287467U discloses a voltage transformer transformation ratio polarity testing device, which comprises an air switch, one end of which is connected between a live wire and a zero wire, and the other end of which is connected with a voltage regulator; one end of the voltage regulator is connected with a wire A630, and the other end of the voltage regulator is connected with a wire N630; connecting a first voltmeter between the line a630 and the line N630; a second voltmeter is connected between line L630 and said line N630. Through observing the magnitude of voltage that first voltmeter and second voltmeter show, can detect out voltage transformer and whether the transformation ratio polarity error problem has appeared, nevertheless this utility model needs further manual calculation, could obtain the transformation ratio result.
In view of the above reasons, on the basis of fully understanding the working principle of the capacitive voltage transformer and combining with the field working experience for many years, the invention provides the instrument which is simple and convenient to work, safe, practical, efficient to work, strong in noise resistance, low in cost and specially used for carrying out the transformation ratio and polarity test of the capacitive voltage transformer. The development of the instrument fills the blank that no special instrument is provided for testing the transformation ratio and the polarity of the capacitor voltage transformer. The research result is leading in China, and once the research result is successfully developed, the application prospect is wide.
The invention content is as follows:
in order to solve the problems of high dangerousness, complex working procedures, low efficiency and the like in the process of transformation ratio and polarity test of the capacitor voltage transformer in the prior art, the invention provides an efficient and safe instrument special for the transformation ratio and polarity test of the capacitor voltage transformer. The specific technical scheme is as follows:
a capacitance voltage transformer transformation ratio and polarity test instrument comprises a high-voltage output module and a voltage signal acquisition and calculation module; the two modules are connected in series; the high-voltage output module comprises a primary side boosting transformer and a high-voltage output voltage-dividing resistance unit which are connected in parallel.
The output range of the primary voltage of the test instrument is 1000-10000V, the secondary measurement voltage is 0-100V, and the design precision is 0.2 grade.
The high-voltage output voltage-dividing resistor unit comprises a high-power high-voltage resistor and three high-precision wire-wound resistors; one end of the high-power high-voltage resistor is connected to a capacitor voltage transformer to be tested, and the other end of the high-power high-voltage resistor is connected with the high-precision wire-wound resistor in series and leads out a high-voltage-dividing output end; the high-voltage-dividing output end is connected with a voltage signal acquisition and calculation module; the other end of the high-precision wire-wound resistor is grounded, and the three high-precision wire-wound resistors are connected in parallel.
Preferably, the high-power high-voltage resistor is 100M omega/25W, and the high-precision wire winding resistor is 200K omega/2W.
The voltage signal acquisition and calculation module adopts a high-precision ADC chip LTC1856, and the ADIN _ CH0 in the chip acquires a high-voltage side voltage division signal output by a high-voltage division output end; the ADIN _ CH1, the ADIN _ CH2, the ADIN _ CH3 and the ADIN _ CH4 collect low-voltage side signals output by the to-be-detected capacitor voltage transformer.
The high-precision ADC chip LTC1856 is 16-bit, has positive and negative 10V input, has a theoretical resolution of 302Uv, supports 8-channel ADC signal sampling, has a sampling rate of 100kbps, can achieve real-time acquisition and processing for 50Hz alternating current signal sampling, and has an input end capable of bearing high-voltage input protection of up to 30V.
The high-precision ADC chip LTC1856 performs division operation on the sampled signals through the microprocessor, the positive and negative of an operation result are the polarities of the collected signals, and the size of the operation result is a transformation ratio.
The working process of the instrument is as follows: when the point source is connected, the microprocessor can detect the state of an I/O port of the singlechip firstly, when the limit switch is not pressed down, the I/O can output a high level, the microprocessor detects the high level at the moment, the high level indicates that the high voltage output by the boosting transformer is not at a zero position, and the driving circuit can drive the transformer, so that the high voltage output of the instrument reaches the zero position after the limit switch is pressed down; at the moment, the high-voltage-dividing output end and four low-voltage-measuring output ends of the capacitor voltage transformer are connected into an instrument; the microprocessor carries out division operation on the sampled signals, and the operation result is displayed on a display screen of the instrument, wherein the positive and negative of the operation result are the polarities of the collected signals, and the size of the operation result is a transformation ratio; and finally, storing and printing the operation result record.
The invention has the following beneficial effects:
firstly, the instrument has high automation degree, humanized software design, friendly human-computer interface and simple operation. During the test, the voltage is automatically boosted, the precision of the output voltage is controllable, and the test of the transformation ratio and the polarity of all secondary coils of various capacitor voltage transformers of 500kV and below can be automatically completed only by once wiring.
Second, make full use of current dielectric loss appearance's high voltage test line, the experimental process of reasonable arrangement, after the test has accomplished transformation ratio polarity, do not need the second time wiring, just can carry out follow-up dielectric loss test, shorten test time greatly, improve efficiency of software testing, really accomplish the effect of doing the best of effort doubly.
And thirdly, the arrangement of the high-voltage output voltage-dividing resistance unit improves the voltage-dividing precision and the temperature stability, and the subsequent ADC acquisition precision is ensured due to reliable voltage-dividing precision and reasonable parameters. At present, a non-special instrument can only measure the transformation ratio of the capacitor voltage transformer, the measurement precision can only reach about +/-5%, and the instrument can improve the transformation ratio measurement precision to 0.2%.
And fourthly, the sampling rate of the adopted high-precision ADC chip LTC1856 can reach 100kbps, and the sampling of 50Hz alternating current signals can be collected and processed in real time, so that the authenticity and the reliability of field measurement data are further ensured.
And fifthly, the limit switch is adopted for detection, the safety coefficient in the use process is high, and the protection function is perfect, so that the personal safety of the testing personnel is ensured.
Description of the drawings:
FIG. 1 is a schematic diagram of the operation of the instrument
FIG. 2 is a schematic diagram of a high voltage output module
FIG. 3 shows an ADC acquisition module
The specific embodiment is as follows:
a transformation ratio and polarity test instrument for a capacitance voltage transformer comprises a high-voltage output module and a voltage signal acquisition and calculation module. The high-voltage output module comprises a primary side boosting transformer and a high-voltage output voltage-dividing resistance unit which are connected in parallel.
The high-voltage output voltage-dividing resistor unit comprises a high-power high-voltage resistor R1(100M omega/25W) and three high-precision wire-wound resistors R2-R4(200K omega/2W); one end of the R1 is connected with the capacitor voltage transformer to be tested, and the other end is connected with the R2-R4 in series and led out of a high-voltage-dividing output end; the high-voltage-dividing output end is connected with a voltage signal acquisition and calculation module; the other ends of R2-R4 are grounded, and R2, R3 and R4 are connected in parallel. The voltage signal acquisition and calculation module adopts a high-precision ADC chip LTC1856, and the ADIN _ CH0 in the chip acquires a high-voltage side voltage division signal output by a high-voltage division output end;
the ADIN _ CH1, the ADIN _ CH2, the ADIN _ CH3 and the ADIN _ CH4 collect low-voltage side signals output by the to-be-detected capacitor voltage transformer.
The high-precision ADC chip LTC1856 is 16-bit, has positive and negative 10V input, has a theoretical resolution of 302Uv, supports 8-channel ADC signal sampling, has a sampling rate of 100kbps, can achieve real-time acquisition and processing for 50Hz alternating current signal sampling, and has an input end capable of bearing high-voltage input protection of up to 30V.
The high-precision ADC chip LTC1856 performs division operation on the sampled signals through the microprocessor, the positive and negative of an operation result are the polarities of the collected signals, and the size of the operation result is a transformation ratio.
The working process of the instrument is as follows: when the point source is connected, the microprocessor can detect the state of an I/O port of the singlechip firstly, when the limit switch is not pressed down, the I/O can output a high level, the microprocessor detects the high level at the moment, the high level indicates that the high voltage output by the boosting transformer is not at a zero position, and the driving circuit can drive the transformer, so that the high voltage output of the instrument reaches the zero position after the limit switch is pressed down; at the moment, the high-voltage-dividing output end and four low-voltage-measuring output ends of the capacitor voltage transformer are connected into an instrument; the microprocessor carries out division operation on the sampled signals, and the operation result is displayed on a display screen of the instrument, wherein the positive and negative of the operation result are the polarities of the collected signals, and the size of the operation result is a transformation ratio; and finally, storing and printing the operation result record.
Claims (1)
1. A capacitance voltage transformer transformation ratio and polarity test instrument is characterized by comprising a high-voltage output module and a voltage signal acquisition and calculation module; the two modules are connected in series; the high-voltage output module comprises a primary side boosting transformer and a high-voltage output divider resistance unit which are connected in parallel; the high-voltage output voltage-dividing resistor unit comprises a high-power high-voltage resistor and three high-precision wire-wound resistors; one end of the high-power high-voltage resistor is connected to a capacitor voltage transformer to be tested, and the other end of the high-power high-voltage resistor is connected with the high-precision wire-wound resistor in series and leads out a high-voltage-dividing output end; the high-voltage-dividing output end is connected with a voltage signal acquisition and calculation module; the other end of the high-precision wire-wound resistor is grounded, and the three high-precision wire-wound resistors are connected in parallel;
the voltage signal acquisition and calculation module adopts a high-precision ADC chip LTC 1856; the high-precision ADC chip LTC1856 performs division operation on the sampled signals through a microprocessor, the positive and negative of an operation result are the polarities of the collected signals, and the size of the operation result is a transformation ratio;
the output range of the primary voltage of the test instrument is 1000-10000V, the secondary measurement voltage is 0-100V, and the design precision is 0.2 grade; the high-power high-voltage resistor is 100 MOmega/25W; the high-precision wire-wound resistor is 200K omega/2W;
the ADIN _ CH0 in the high-precision ADC chip LTC1856 collects a high-voltage side voltage division signal output by a high-voltage division output end; acquiring low-voltage side signals output by the to-be-tested capacitor voltage transformer by the ADIN _ CH1, the ADIN _ CH2, the ADIN _ CH3 and the ADIN _ CH 4; the high-precision ADC chip LTC1856 is 16-bit, has positive and negative 10V input, has a theoretical resolution of 302Uv, supports 8-channel ADC signal sampling, has a sampling rate of 100kbps, can achieve real-time acquisition and processing for 50Hz alternating current signal sampling, and has an input end capable of bearing high-voltage input protection of up to 30V.
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| CN110244110A (en) * | 2019-07-10 | 2019-09-17 | 无锡应达工业有限公司 | A kind of voltage sensor control module that more ratios are adjusted |
| 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 |
| CN112730970B (en) * | 2020-12-18 | 2023-07-18 | 扬州大学 | Isolated high-precision wide-range voltage measurement system and measurement method |
| CN114252674B (en) * | 2021-12-15 | 2023-09-22 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
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| CN101324657B (en) * | 2008-07-15 | 2012-07-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Mutual inductor on-line monitoring method for transforming plant high pressure measurement |
| CN101625403B (en) * | 2009-07-28 | 2012-02-01 | 山西省电力公司电力科学研究院 | Testing device for high-voltage three-phase combination transformer |
| CN202563077U (en) * | 2012-04-27 | 2012-11-28 | 江苏省电力公司宿迁供电公司 | Detector for electric energy metering apparatus |
| CN202948129U (en) * | 2012-12-12 | 2013-05-22 | 湖南省电力公司科学研究院 | Tester for voltage withstanding test apparatus of electric energy meter |
| CN206757021U (en) * | 2017-05-23 | 2017-12-15 | 福建瑞能博尔电力设备有限公司 | High voltage ac/dc voltmeter calibration detection means |
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