CN101718851B - Calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle - Google Patents
Calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle Download PDFInfo
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- CN101718851B CN101718851B CN200910213841XA CN200910213841A CN101718851B CN 101718851 B CN101718851 B CN 101718851B CN 200910213841X A CN200910213841X A CN 200910213841XA CN 200910213841 A CN200910213841 A CN 200910213841A CN 101718851 B CN101718851 B CN 101718851B
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Abstract
The invention relates to a calibrating apparatus for an electronic transducer calibrator based on an alternating current bridge, which comprises a frequency and voltage stabilization source, an alternating current bridge, a standard sampling device, a protocol conversion unit and a synchronous signal generator, wherein the frequency and voltage stabilization source provides an alternating current voltage with adjustable frequency and amplitude of 0-100V to be output to a calibrated electronic transducer calibrator (ELTC) and the alternating current bridge; the alternating current bridge can adjust the amplitude ratio, the phase difference and the accuracy between the input voltage and the output voltage of the alternating bridge to reach 0.2 level; the standard sampling device digitally samples the output of the alternating current bridge; the protocol conversion unit carries out data range conversion on the output of the standard sampling device and then forms the output to a data frame which is sent to the EITC through Internet; and the synchronous signal generator generates two paths of square wave signals with completely synchronous pulse porches, one path of square wave signals is sent to the detected EITC and the other path is sent to the standard sampling device to enable an analog-to-digital converter inside the EITC and the standard sampling device to be synchronously started for sampling. The device can effectively obtain errors which are introduced when the EITC measures the errors of the electronic transducer.
Description
Technical field
The present invention relates to a kind of calibrating installation,, be used to examine and determine the measuring error of electronic transducer calibration instrument (EITC) based on alternating current bridge balance principle.
Background technology
Electronic mutual inductor (EIT) is different from traditional mutual inductor, and it is output as digital quantity, adopts the IEC61850-9-1 standard transmission.Electronic mutual inductor has begun to be applied to the digital transformer substation pilot project as novel electric power equipment.
The effect of electronic transducer calibration instrument (EITC) is the measuring error of check electronic mutual inductor, has the technical scheme of comparative maturity at present, and EITC generally has the input of three road signals: the one tunnel is the network signal input port, receives the numeral output from EIT; One the tunnel is the standard signal input port, receives the secondary simulation output from traditional standard mutual inductor (accuracy is than high two grades of EIT), and analog to digital conversion is carried out to it in EITC inside; Also have one the tunnel to be the synchronizing pulse input port, be used to start the analog to digital conversion of standard signal, make it to keep synchronously with the sampling of EIT.EITC compares the amplitude and the phase place of two-way sampled signal then, thereby obtains amplitude error and the phase error of EIT.Because EITC possibly bring error in signals collecting and processing procedure, therefore also must examine and determine the error of EITC.
But until today; Error calibrating to EITC itself is not well solved all the time; Reason is that everybody adopts the digital spc source to produce the alternating voltage that two-way has certain amplitude ratio and phase differential; And the setting value of digital spc source phase differential can't reach the precision of 1 ' (with respect to 1/60 degree of power frequency) all the time, but according to national standard, the phase error of EITC requires in 1 '.This has just caused the phase error of EITC accurately to define.In addition, be digital signal because EITC has one tunnel input, this just requires when calibrating, need provide one tunnel standard digital signals to EITC.
Summary of the invention
The object of the invention; Just be to provide a kind of calibrating installation of the electronic transducer calibration instrument based on alternating current bridge balance principle; This device can accurately be controlled EITC amplitude ratio and phase differential between the two-way input signal when calibrating, thereby can accurately measure the error of seized EITC.
Realize the foregoing invention purpose, the calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle of the present invention is characterized in that comprising:
One frequency-and voltage-stabilizing source provides the alternating voltage of 0～100V of frequency and adjustable amplitude value to export seized EITC and alternating current bridge described below to;
Alternating current bridge; Be traditional mature technology; Adopt resistance, electric capacity and reactance component to constitute, adjust the value size of these elements, can change amplitude between alternating current bridge input voltage and the output voltage than f and phase differential δ; And accuracy can reach 0.2 grade, is far longer than the digital spc source of present employing;
In fact standard sampling device is exactly an analog to digital converter, and the output voltage of alternating current bridge is carried out sampling with high precision, and the power frequency component sampling precision reaches 100ppm;
Conversion unit of protocol is carried out the data range conversion with the numeral output of standard sampling device according to the IEC61850-9-1 standard, forms Frame then, sends to seized EITC through Ethernet; Another function of conversion unit of protocol is to receive the calibrating order, then startup command is issued to synchronous generator through serial ports, begins one time verification process;
Synchronous generator, its effect are to produce two-way porch synchronous square-wave signal fully, and one the tunnel gives seized EITC, and one the tunnel gives standard sampling device, make EITC inner analog to digital converter and standard sampling device start sampling synchronously.
Described conversion unit of protocol has on the common computer of 100M ethernet nic one and realizes; Described computing machine is connected with synchronous generator through serial ports, and is connected reception sampled data in real time with standard sampling device through the USB-GPIB card of prior art.
Described synchronous generator comprises flush bonding processor and signal converter; Be installed on the PCI slot of described computing machine; The square-wave signal that is used for flush bonding processor is sent requires to carry out the voltage amplitude conversion according to the level of EITC or standard sampling device, and synchronous generator is connected through the RS232 serial ports with conversion unit of protocol.
When being compared with the standard error of alternating current bridge, just can draw the error that seized EITC introduces when measuring the EIT error by the output error of checking device EITC.
Beneficial effect: owing to adopt accuracy to reach 0.2 grade alternating current bridge, the amplitude relative error scope of two-way voltage can reach 7*10
-7～2*10
-3The relative error scope of phase place is: 0.0001; Be higher than the accuracy that the digital spc source can reach far away, and adopt existing 8 half word multimeter Aglient 3458A as standard sampling device, near the AC sampling precision power frequency can reach 100ppm; And can trace to the source to national standard, make this device can obtain the error that EITC introduces effectively when measuring the EIT error.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description.
Fig. 1 electronic transducer calibration instrument calibrating schematic diagram;
The electrical schematic diagram one of Fig. 2 synchronous generator;
The electrical schematic diagram two of Fig. 3 synchronous generator.
Among Fig. 1: 1-electronic transducer calibration instrument, 2-alternating current bridge, 3-standard sampling device, 4-conversion unit of protocol, 5-frequency-and voltage-stabilizing source, 6-synchronous generator, 7-calibrating apparatus for electronic transducer calibration instrument.
Embodiment
Can see that from Fig. 1 to Fig. 3 the calibrating apparatus for electronic transducer calibration instrument 7 based on alternating current bridge balance principle of the present invention is characterized in that comprising:
The XL803 power source of Shenzhen star dragon company is adopted in frequency-and voltage-stabilizing source 5, and it provides the alternating voltage output of 0～100V, frequency and adjustable amplitude value, and degree of stability is not less than 0.01%.
Alternating current bridge 2, it adopts resistance, electric capacity and reactance component to constitute, and adjusts the value size of these elements, can change amplitude between electric bridge input voltage and the output voltage than f and phase differential δ, and the accuracy of f, δ can reach 0.2 grade.The calibrating of tradition mutual-inductor tester also is the method that adopts alternating current bridge, and ripe product has been arranged, and is called the mutual inductor tester whole health check-up and decides device.
Alternating current bridge of the present invention 2 adopts is that device (abbreviation BHE) decide in the BHE type mutual inductor tester whole health check-up of Shanxi mutual inductor Research Institute; Its amplitude is than between the setting district being: 0.01%～100%; Be 0.05 '～500 ' between the phase differential setting district; The accuracy of setting value is 0.2 grade, is the error of error because the accuracy of BHE representes, so the amplitude relative error scope of the two-way voltage of alternating current bridge is: 7*10
-7～2*10
-3, the relative error scope of phase place is: 0.0001 '～1 ', be far longer than the highest standard (amplitude relative error 0.02%, phase place relative error 3 ') in present digital spc source.
Conversion unit of protocol 4, its effect are that the numeral output of standard sampling device is carried out the data range conversion according to the IEC61850-9-1 standard, form Frame then, send to EITC through Ethernet.The function of conversion unit of protocol realizes the Labview too development of the calibrating The software adopted NI company of computer run at a Daepori all on the computing machine.Computing machine is connected with synchronous generator through serial ports, will examine and determine order and be handed down to synchronous generator.Computing machine is connected with standard sampling device through a USB-GPIB card (matured product); Receive sampled data in real time, and carry out the data range conversion, form the network Frame then according to the IEC61850-9-1 standard; The time tag that starts first data that receive after the calibrating is made as 0; The data of back increase by 1 successively, perhaps restart calibrating up to reaching 65535, again since 0 counting.The network data frame sends to EITC through Ethernet, and computing machine has the 100M ethernet nic.
The 5V power supply of synchronous generator is taken from the 5V power supply in the computer PCI groove, adopts power conversion chip LM1117-3.3V to produce the 3.3V direct supply, adopts power conversion chip LM1117-1.8V to produce 1.8V direct supply (accompanying drawing 3).LPC2214 needs a reset signal in the time of electrifying startup, so adopt reset device SP708S (accompanying drawing 3) to produce power-on reset signal, SP708S connects a reset key, is used at verification process synchronous generator being restarted (generally not needing).
Because the trigger pulse level of standard sampling device is 5V; The sampling triggering level of some ETIC also is 5V; So adopting level transferring chip SN74LVC4245A is the 5V signal with the 3.3V conversion of signals of LPC2214 output bus, the output pin P0.9 of LPC2214 and P0.10 are used for the output of level square-wave pulse.
Synchronous generator receives the startup command from conversion unit of protocol, sends two-way sampling synchronization pulse signal then, and synchronous generator is connected through the RS232 serial ports with conversion unit of protocol, and synchronous generator adopts RS232 controller SP3232E.
When being compared with the standard error of alternating current bridge, just can draw the error that seized EITC introduces when measuring the EIT error by the output error of checking device EITC.
Claims (3)
1. calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle, its characteristic comprises:
The frequency-and voltage-stabilizing source provides the alternating voltage of 0～100V of frequency and adjustable amplitude value to export seized electronic transducer calibration instrument and alternating current bridge described below to;
Amplitude between scalable alternating current bridge input voltage and the output voltage can reach 0.2 grade alternating current bridge than f and phase differential δ, accuracy;
Standard sampling device is carried out digital sample to the output of alternating current bridge;
Conversion unit of protocol is carried out the data range conversion with the numeral output of standard sampling device according to the IEC61850-9-1 standard, forms Frame then, sends to electronic transducer calibration instrument through Ethernet;
Synchronous generator; Produce two-way porch synchronous square-wave signal fully; One the tunnel gives seized electronic transducer calibration instrument, and one the tunnel gives standard sampling device, makes electronic transducer calibration instrument inner analog to digital converter and standard sampling device start sampling synchronously.
2. the calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle according to claim 1; It is characterized in that: described conversion unit of protocol has on the common computer of 100M ethernet nic one and realizes; Described computing machine is connected with synchronous generator through serial ports, and is connected reception sampled data in real time with standard sampling device through the USB-GPIB card of prior art.
3. the calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle according to claim 2; It is characterized in that: described synchronous generator comprises flush bonding processor and signal converter; Be installed on the PCI slot of described computing machine; The square-wave signal that is used for flush bonding processor is sent requires to carry out the voltage amplitude conversion according to the level of EITC or standard sampling device; Synchronous generator is connected through the RS232 serial ports with conversion unit of protocol, and synchronous generator adopts RS232 controller SP3232E.
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| CN200910213841XA CN101718851B (en) | 2009-12-15 | 2009-12-15 | Calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle |
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| CN200910213841XA CN101718851B (en) | 2009-12-15 | 2009-12-15 | Calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle |
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| CN101718851B true CN101718851B (en) | 2012-01-25 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102944861B (en) * | 2012-11-06 | 2015-05-06 | 国家电网公司 | Electronic transformer calibrator calibration device and method based on digital source |
| CN103197273A (en) * | 2013-03-28 | 2013-07-10 | 国家电网公司 | Source tracing device used for electronic mutual inductor output calibration instrument |
| CN105954702B (en) * | 2016-07-18 | 2018-11-30 | 国家电网公司 | The phase error detection system and method for electronic transducer calibration instrument |
| CN106483489B (en) * | 2016-11-17 | 2023-09-29 | 云南电网有限责任公司电力科学研究院 | Calibrating device of mutual-inductor check gauge based on detection feedback |
| CN106950420A (en) * | 2017-05-11 | 2017-07-14 | 国家电网公司 | The zero-acrross ing moment detecting system and its method of power frequency simple alternating current electric signal |
| CN107390157A (en) * | 2017-06-20 | 2017-11-24 | 中国电力科学研究院 | A kind of apparatus and method for verifying direct current instrument transformer square-wave response |
| CN108776245B (en) * | 2018-04-09 | 2024-01-23 | 国网四川省电力公司电力科学研究院 | Calibrating device capable of automatically calibrating transformer calibrator with multiple principles |
| CN113311373A (en) * | 2021-06-24 | 2021-08-27 | 广东电网有限责任公司 | Calibration method and calibration device for direct-current voltage transformer calibrator |
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| CN2132193Y (en) * | 1992-08-05 | 1993-05-05 | 杨传旺 | Electronic type parity checker for mutual-inductor |
| CN101231332A (en) * | 2008-02-29 | 2008-07-30 | 武汉华瑞测控科技有限公司 | Full-automatic mutual inductor tester whole checking system |
| CN201548680U (en) * | 2009-12-16 | 2010-08-11 | 广东电网公司电力科学研究院 | Electronic type mutual inductor calibrator calibrating apparatus based on alternating current electric bridge balancing principle |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510600 No. 73 Meihua Road, Guangzhou, Guangdong, Yuexiu District Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |
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