CN103424589B - A kind of voltage transformer calibration microvolt level low level signal amplification device - Google Patents
A kind of voltage transformer calibration microvolt level low level signal amplification device Download PDFInfo
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- CN103424589B CN103424589B CN201310324263.3A CN201310324263A CN103424589B CN 103424589 B CN103424589 B CN 103424589B CN 201310324263 A CN201310324263 A CN 201310324263A CN 103424589 B CN103424589 B CN 103424589B
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Abstract
A kind of voltage transformer calibration microvolt level low level signal amplification device, including: analogue signal input block, first order signal filtering and amplifying unit, second level signal filtering and amplifying unit, signal conversion unit, power conversion and administrative unit, after the differential pressure signal of standard potential transformer and tested voltage transformer is accessed by analogue signal input block, after completing prime signal condition, sequentially enter first order signal filtering and amplifying unit and second level signal filtering and amplifying unit is filtered and amplifies 1000 times, output signal delivers to electronic transducer calibration instrument measurement and display after signal conversion unit is nursed one's health, draw final result.This device adopts the improved belt pass filter amplifying circuit that two-stage is identical, microvolt level signal is amplified and is filtered, microvolt level signal is amplified to millivolt level, improves certainty of measurement and the measurement scope of electronic type tester.
Description
Technical field
The present invention relates to a kind of voltage transformer verification microvolt level low level signal amplification device, be applied to high-accuracy voltage transformer electronic type tester, belong to high-voltage great-current and measure and metering field.
Background technology
Measurement and metering field at high-voltage large current, it is necessary to use voltage transformer summation current transformer to be converted to measured in the range ability of double measurement equipment according to certain ratio.In order to ensure above-mentioned measurement result accurately and reliably, transformer all must carry out periodic check according to the regulation of relevant code, namely carrying out multimetering under different operating currents or voltage, load and no-load voltage ratio, not only test job amount is heavy, and requires there is higher accuracy of measurement.Therefore one of the automaticity of Transformer Calibrator, accuracy and degree of stability important topic becoming electrical measurement field is improved.
Country's power-frequency voltage and current ratio standard accuracy have reached 1 × 10-6Level, metering institute of each province, DianKeYuan, the power-frequency voltage of measurement centre and current ratio standard have also met or exceeded 1 × 10-5Level, current electronic transducer calibration instrument cannot complete the verification of this accuracy class transformer, traditional electrician's formula mutual-inductor tester then exists that complex operation, workload be big, personnel expend the shortcomings such as many, therefore develops a kind of high accuracy, automaticity multifunctional mutual-inductor tester high, stable performance has a wide range of applications.Each province, city metering institute, DianKeYuan, measurement centre etc. carry out the department of power-frequency voltage transmission of quantity value all outfit demand.
Currently used mutual-inductor tester generally adopts differential balance relative method or non-equilibrium variate principle, and the advantage of this tester is that the accuracy requirement to itself is not high, because this tester error in reading is the error of tested transformer error.Adopt the resolving power of HEJ type mutual-inductor tester of differential balance relative method up to 1 × 10-8, accuracy is 2%, may be used to verification 0.0001 grade and following transformer, but this tester needs to regulate manually, zero-detection balance difficulties, uses inconvenience.Adopt the non-equilibrium differential type tester of microcomputer technology, by the test to the differential wave of tested transformer secondary circuit and standard mutual inductor secondary circuit and standard mutual inductor secondary circuit working signal, the error obtaining transformer is calculated according to error defined formula, in order to ensure the accuracy measured, this type of tester have employed a set of extremely complex sampling pulses such as multistage amplification, filtering, phase demodulation, waveform conversion, phase-locked and shaping and forms circuit.The more traditional electrician's formula tester of work efficiency of this type of tester increases, its shortcoming is that circuit is complicated, debugging difficulty is big, when differential wave is less, accuracy of measurement and stability are not good enough, and the concordance of repeated measure is poor, are normally only applicable to the transformer of inspection less than 0.01 grade.Country's power-frequency voltage and current ratio standard accuracy have reached 1 × 10 at present-6Level, metering institute of each province, DianKeYuan, the power-frequency voltage of measurement centre and current ratio standard have also met or exceeded 1 × 10-5Level, a kind of practicality and high efficiency high-precision automatization of exploitation mutual-inductor tester is significant with the needs that power-frequency voltage metering is traced to the source to adapt to Automation of Electric Systems development.
Summary of the invention
It is an object of the invention to: for the defect of prior art, the present invention provides a kind of voltage transformer verification microvolt level low level signal amplification device, it is applied to high-accuracy voltage transformer electronic type tester, the differential pressure signal of standard potential transformer with the output of tested voltage transformer is amplified, microvolt level signal is amplified to millivolt level, improves certainty of measurement and the scope of measurement of electronic type tester.
nullThe technical solution adopted in the present invention is: a kind of voltage transformer calibration microvolt level low level signal amplification device，Including: analogue signal input block、First order signal filtering and amplifying unit、Second level signal filtering and amplifying unit、Signal conversion unit、Power conversion and administrative unit，It is characterized in that，After the differential pressure signal of standard potential transformer and tested voltage transformer is accessed by analogue signal input block，After completing prime signal condition，Sequentially enter first order signal filtering and amplifying unit and second level signal filtering and amplifying unit is filtered and amplifies 1000 times，Output signal delivers to electronic transducer calibration instrument measurement and display after signal conversion unit is nursed one's health，Draw final result，Wherein power conversion and administrative unit and analogue signal input block、First order signal filtering and amplifying unit、Second level signal filtering and amplifying unit、Signal conversion unit is connected and is respectively connected with，Low-voltage protection is provided、Negative pressure produces and voltage stabilizing function.
Voltage transformer calibration microvolt level low level signal amplification device as above, it is characterized in that, first order signal filtering and amplifying unit, second level signal filtering and amplifying unit all adopt the improved belt pass filter amplifying circuit that two-stage is identical, and microvolt level signal is amplified and is filtered.
Voltage transformer calibration microvolt level low level signal amplification device as above, it is characterised in that bandpass filtering amplifying circuit adopts AD8629 precision operational-amplifier.
Voltage transformer calibration microvolt level low level signal amplification device as above, it is characterised in that power conversion and the power supply in administrative unit adopt battery to power.
The invention has the beneficial effects as follows: the voltage transformer verification microvolt level low level signal amplification device of the present invention, it is applied to high-accuracy voltage transformer electronic type tester, the differential pressure signal of standard potential transformer with the output of tested voltage transformer is amplified, adopt the improved belt pass filter amplifying circuit that two-stage is identical, microvolt level signal is amplified and filters, microvolt level signal is amplified to millivolt level, improves certainty of measurement and the measurement scope of electronic type tester.
Accompanying drawing explanation
Fig. 1 is present example operation principle block diagram.
Detailed description of the invention
In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not limited solely to the following examples.The present invention can be made various changes or modifications by those skilled in the art, and these equivalent form of values are equally within claims restriction scope listed by the application.
Description of symbols in accompanying drawing: 1 analogue signal input block, 2 first order signal filtering and amplifying units, 3 second level signal filtering and amplifying units, 4 signal conversion units, 5 power conversions and administrative unit.
As shown in Figure 1, after the differential pressure signal of standard potential transformer and tested voltage transformer is accessed by analogue signal input block 1, after completing prime signal condition, enter first order signal filtering and amplifying unit 2 and second level signal filtering and amplifying unit 3 filters and amplifies 1000 times, output signal delivers to electronic transducer calibration instrument measurement and display after signal conversion unit 4 is nursed one's health, and draws final result.Wherein power conversion and administrative unit 5 provide the functions such as low-voltage protection, negative pressure generation and voltage stabilizing.
This device adopts the improved belt pass filter amplifying circuit that two-stage is identical, and microvolt level signal is amplified and is filtered.Power supply adopts battery to power, and power management section includes the functions such as power conversion, voltage instruction and under-voltage protection.
Conventional band filter gain is less, and gain is generally less than 3 times, and inputs signal from the backward end of amplifier, and the input impedance of signal is very low, and the phase place of synchronous signal is also reverse 180 degree, limits the application in the apparatus of this custom circuit.This bandpass filtering amplifying circuit adopts AD8629 precision operational amplification circuit, and the differential pressure signal of microvolt level, after one-stage low-pass filter, is directly entered the normal phase input end of AD8629, it is thus achieved that higher input impedance.The reversely termination second-order filter network of AD8629, by regulating the RC parameter of second-order filter network, change voltage gain and the mid frequency of filter circuit, emulate, by Theoretical Calculation and mutism, the parameter obtaining each resistance capacitance, final gain is defined as 31.6 times, and mid frequency is 50Hz.Differential pressure signal is after this filter amplifier, and the useful signal of 50Hz is exaggerated and filters, and phase place and primary signal do not have phase shift.Microvolt level signal, after two stage filter amplifier amplifies 1000 times, becomes millivolt level signal, after late-class circuit processes, enters conventional electronic transducer calibration instrument.
In order to reach higher precision, the element of high accuracy and high stability all selected by the electronic component of this device, and operational amplifier adopts AD8629, and resistance adopts 0.01% precision, temperature coefficient 10ppm/ DEG C.The impact that error in order to make up electric capacity causes, have employed high accuracy multi-turn adjustable potentiometer and coordinates capacitor, regulate mid frequency and the gain of filter amplifier in this device, make the mid frequency of this device keep 50Hz, and signal amplifies without phase shift.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (2)
- null1. a voltage transformer calibration microvolt level low level signal amplification device，Including: analogue signal input block、First order signal filtering and amplifying unit、Second level signal filtering and amplifying unit、Signal conversion unit、Power conversion and administrative unit，It is characterized in that，After the differential pressure signal of standard potential transformer and tested voltage transformer is accessed by analogue signal input block，After completing prime signal condition，Sequentially enter first order signal filtering and amplifying unit and second level signal filtering and amplifying unit is filtered and amplifies 1000 times，Output signal delivers to electronic transducer calibration instrument measurement and display after signal conversion unit is nursed one's health，Draw final result，Wherein power conversion and administrative unit and analogue signal input block、First order signal filtering and amplifying unit、Second level signal filtering and amplifying unit、Signal conversion unit is respectively connected with，Low-voltage protection is provided、Negative pressure produces and voltage stabilizing function；First order signal filtering and amplifying unit, second level signal filtering and amplifying unit all adopt identical improved belt pass filter amplifying circuit, microvolt level signal is amplified and filters, improved belt pass filter amplifying circuit adopts AD8629 precision operational amplification circuit, the differential pressure signal of microvolt level is after one-stage low-pass filter, it is directly entered the normal phase input end of AD8629, the reversely termination second-order filter network of AD8629；Improved belt pass filter amplifying circuit gain is 31.6 times, mid frequency is 50Hz, adopts high accuracy multi-turn adjustable potentiometer to coordinate capacitor, regulates mid frequency and the gain of filter amplification circuit, the mid frequency making this filter amplification circuit keeps 50Hz, and signal amplifies without phase shift.
- 2. voltage transformer calibration microvolt level low level signal amplification device according to claim 1, it is characterised in that power conversion and the power supply in administrative unit adopt battery to power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1005653B (en) * | 1986-12-18 | 1989-11-01 | 中国船舶工业总公司第七研究院第七一五研究所 | Automatic mutual-inductor calibrating instrument |
| US7642788B2 (en) * | 2006-12-04 | 2010-01-05 | Fluke Corporation | Voltage measurement instrument and method having improved automatic mode operation |
| CN201438327U (en) * | 2009-04-04 | 2010-04-14 | 广州中沙桥汽车用品有限公司 | Anti-theft alarm device |
| CN201589856U (en) * | 2009-12-11 | 2010-09-22 | 南京南瑞继保电气有限公司 | Precision checking instrument for electronic transformer |
| CN201757765U (en) * | 2010-07-08 | 2011-03-09 | 山东大学 | Micro galvanometer for photocurrent detection |
| CN203465331U (en) * | 2013-07-30 | 2014-03-05 | 国家电网公司 | Microvolt-level small signal amplifying device for calibrating voltage transformer |
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Effective date of registration: 20160607 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China Electric Power Research Institute Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: China Electric Power Research Institute Patentee before: State Grid Corporation of China |