CN108132455A - Global error check system based on combining unit - Google Patents
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- CN108132455A CN108132455A CN201711376152.1A CN201711376152A CN108132455A CN 108132455 A CN108132455 A CN 108132455A CN 201711376152 A CN201711376152 A CN 201711376152A CN 108132455 A CN108132455 A CN 108132455A
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Abstract
The invention discloses a kind of global error check systems based on combining unit, it includes electronic mutual inductor, combining unit, digitalized electrical energy meter and multifunctional measurement and control device；Electronic mutual inductor is connect with combining unit, by the signal transmission that electronic mutual inductor detects to combining unit；Combining unit is connect with digitalized electrical energy meter to be checked, and is tested to digitalized electrical energy meter to be checked；Combining unit is connect with the error comparing calculation module in standard digital electric energy meter, and combining unit verifies digitalized electrical energy meter to be checked by error comparing calculation module；Combining unit is also connect with multifunctional measurement and control device.The advantageous effect that the present invention obtains is：Electric energy accumulation is carried out based on electronic mutual inductor high sampling rate FT3 messages, is obviously improved digital standard table sampled value rate, subwave, harmonic wave these electric energy can be measured, test result is closer to electric energy true value；Using non-pulse method of calibration, the operational reliability and stability of measuring equipment are improved.
Description
Technical Field
The invention relates to the technical field of measurement and check of digital electric energy meters, in particular to an integral error check system based on a merging unit.
Background
At present, the investment scale of the country for building a digital substation is continuously increased, the demand of an electric energy meter of the digital substation is increased, and the application of an electronic voltage current transformer and intelligent primary equipment enables the digital electric energy meter with voltage and current signals input by Ethernet digital quantity based on IEC61850 protocol to become important equipment for electric energy metering of the digital substation. Although corresponding checking equipment has been developed by some domestic research institutions at present, checking methods and checking devices are various and not unified, and technical indexes of the checking methods and the checking devices are not clear.
In a traditional transformer substation, an electromagnetic transformer outputs an analog voltage and current signal, and an electric energy meter converts analog quantity into digital quantity to calculate electric energy. The principles and interface modes of the electronic transformer and the digital electric energy meter are fundamentally changed.
However, the related calibration regulations for the digital electric energy meter are not available at present, so that the calibration of the digital electric energy meter generally refers to the electronic multifunctional electric energy meter detection load point specified in jjjg 596 "calibration regulations for the electronic multifunctional electric energy meter for precision calibration in specific engineering use.
The existing calibration method has the major disadvantage that during calibration, a voltage and current signal is required to be led out from a merging unit to a reserved calibration interface separately, then a small-sized switch is connected, a signal entering an electric energy meter from the merging unit is extracted and is connected to an optical fiber converter, but during the working period of the converter, the digital electric energy meter loses the signal, the measurement is stopped, and the measurement loss is caused.
Meanwhile, at present, no legal inspection regulation and standard unified system exists for carrying out comprehensive error inspection on the digital electric energy metering device.
Disclosure of Invention
In view of the above defects in the prior art, an object of the present invention is to provide an integral error checking system based on a merging unit, which performs electric energy accumulation based on a high sampling rate FT3 message of an electronic transformer, significantly improves a sampling value rate of a digital standard meter, and fits errors of metering nodes of a digital electric energy meter, so as to ensure that the standard digital electric energy meter can meter electric energy such as sub-waves and harmonics, and a test result is closer to a true electric energy value. A non-pulse checking method is adopted for the integrated secondary equipment, so that the normal operation of the measurement is not influenced during measurement checking, and the operation reliability and stability of the measurement equipment are greatly improved.
The invention is realized by the technical scheme, and the system for checking the integral error based on the merging unit comprises the following components: the system comprises an electronic transformer, a merging unit, a digital electric energy meter and a multifunctional measurement and control device;
the electronic transformer is connected with the merging unit and transmits a primary signal detected by the electronic transformer to the merging unit;
the merging unit is connected with the digital electric energy meter to be detected and is used for detecting the digital electric energy meter to be detected;
the merging unit is connected with an error comparison calculation module in a standard digital electric energy meter, and the merging unit verifies the digital electric energy meter to be detected through the error comparison calculation module;
the merging unit is also connected with the multifunctional measurement and control device.
Further, embedding the merging unit into a standard digital electric energy meter to form a standard digital electric energy meter for checking and then checking;
the method comprises the steps that a calibration standard digital electric energy meter collects primary signals output by an alternating current conversion module in an electronic transformer;
and the calibration standard digital electric energy meter simultaneously receives FT3 messages output by other merging units, and outputs the acquired primary signals and the received FT3 messages to the digital electric energy meter to be detected or a multifunctional measurement and control device in a message frame mode.
Further, the electronic transformer comprises an electronic current transformer and an electronic voltage transformer;
an A/D conversion module is arranged in the electronic transformer, and the conversion principle of the A/D conversion module is as follows:
after the analog quantity signal is input into the electronic transformer, the analog quantity signal is transmitted to a CPU system through a low-pass filtering and analog-to-digital conversion module;
the optical fiber loop 1 transmits the power supply loop and the sampling interruption extraction loop to the CPU system; the CPU system feeds back to the fiber loop 2.
Further, the system also comprises a check on the overall error in the following way:
a current and voltage sampling device in the merging unit collects primary signals of the electronic transformer and transmits the collected primary signals to an optical fiber transceiver in a standard digital electric energy meter in a standby mode;
the optical fiber transceiver transmits the received signals to a main control unit in a standard digital electric energy meter through a metering optical fiber for analysis, and the main control unit meters the analyzed signals.
Further, the system checks the error of the digital electric energy meter to be checked in the following manner:
in the formula: gamma is the relative error; wXRecording the electric energy of the digital electric energy meter to be detected; wNIs a theoretical electric energy value.
Further, when the digital signal source outputs a sampling value data frame conforming to a DL/T860.91 or DL/T860.92 protocol, the system corrects the error of the digital electric energy meter to be detected in the following way:
in the formula: t1-t 1'<1s，t2-t2’<1 s; gamma is the relative error; wN1The electric energy value at the time t 1; wN2The electric energy value at the time t 2; wX1Metering the electric energy recorded at the moment of the node t 1' for the digital electric energy meter to be detected; wX2The electric energy recorded at the moment of the node t 2' is measured for the digital electric energy meter to be checked.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) the method comprises the steps that electric energy accumulation is carried out on the basis of an electronic transformer high sampling rate FT3 message, the sampling value rate of a digital standard meter is remarkably improved, meanwhile, the error of a metering node of the digital electric energy meter is fitted, the standard digital electric energy meter can be guaranteed to meter electric energy such as secondary waves and harmonic waves, and the test result is closer to the true value of the electric energy;
(2) a non-pulse checking method is adopted for the integrated secondary equipment, so that the normal operation of the measurement is not influenced during the measurement checking, and the operation reliability and stability of the measurement equipment are greatly improved;
(3) the standard digital electric energy meter can adopt a high-digit AD chip and an oversampling technology, so that the bandwidth is high, and the metering accuracy of the standard digital electric energy meter is high;
(4) the standard digital electric energy meter asynchronous algorithm can adopt 6 orders or more, and the error of the asynchronous algorithm approaches zero;
(5) the standard digital electric energy meter can adopt technologies such as multi-gear automatic switching and FIR filter, etc., and has large measurement dynamic range and low signal-to-noise ratio;
(6) the standard digital electric energy meter can independently accumulate multiple harmonics based on a high sampling rate, and can carry out fundamental wave electric energy accumulation and harmonic wave electric energy accumulation verification on the analog electric energy meter.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
The drawings of the invention are illustrated as follows:
fig. 1 is a system diagram of an integrated merging unit-based error checking system.
FIG. 2 is a diagram illustrating merging unit verification of a merging unit-based global error checking system.
Fig. 3 is a schematic diagram of a built-in a/D conversion module of an electronic transformer of the integrated error checking system based on the merging unit.
Fig. 4 is a schematic diagram of a calibration standard digital electric energy meter of the integrated error checking system based on the merging unit.
Fig. 5 is a schematic diagram of an overall error test of the integrated error checking system based on the merging unit.
Fig. 6 is a schematic block diagram of a merging unit-based overall error checking system for checking metering nodes of a digital electric energy meter to be checked.
FIG. 7 is a system diagram for calibrating the metering nodes of the digital electric energy meter to be calibrated based on the integrated error calibration system of the merging unit.
Fig. 8 is a schematic diagram of the synchronization signal input of the integrated error checking system based on the merging unit.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example (b): as shown in fig. 1-8; an integrated error checking system based on merging unit, comprising: the system comprises an electronic transformer, a merging unit, a digital electric energy meter and a multifunctional measurement and control device;
the electronic transformer is connected with the merging unit and transmits a primary signal detected by the electronic transformer to the merging unit;
the merging unit is connected with the digital electric energy meter to be detected and is used for detecting the digital electric energy meter to be detected;
the merging unit is connected with an error comparison calculation module in a standard digital electric energy meter, and the merging unit verifies the digital electric energy meter to be detected through the error comparison calculation module;
the merging unit is also connected with the multifunctional measurement and control device.
The electronic transformer comprises an electronic current transformer and an electronic voltage transformer;
an A/D conversion module is arranged in the electronic transformer, and the conversion principle of the A/D conversion module is as follows:
after the analog quantity signal is input into the electronic transformer, the analog quantity signal is transmitted to a CPU system through a low-pass filtering and analog-to-digital conversion module;
the optical fiber loop 1 transmits the power supply loop and the sampling interruption extraction loop to the CPU system; the CPU system feeds back to the fiber loop 2.
Embedding the merging unit into a standard digital electric energy meter to form a standard digital electric energy meter for checking and then checking;
the method comprises the steps that a calibration standard digital electric energy meter collects primary signals output by an alternating current conversion module in an electronic transformer;
and the calibration standard digital electric energy meter simultaneously receives FT3 messages output by other merging units, and outputs the acquired primary signals and the received FT3 messages to the digital electric energy meter to be detected or a multifunctional measurement and control device in a message frame mode.
After the merging unit is embedded into the digital standard meter, the merging unit is mainly used for receiving digital signals of the collector and analog signals from the electromagnetic mutual inductor and directly accumulating electric energy, and IEC 61850-9-2LE protocols after the signals are merged and processed are transmitted to the digital meter or a multifunctional measurement and control device. The function of the device is as follows:
(1) and receiving and processing data transmitted by up to 12-way collectors. The A/D sampling part of the merging unit can sample at most 6 paths of analog signals output by the AC conversion module
(2) And receiving the station end synchronous signals and synchronizing the A/D sampling of each path.
(3) And receiving FT3 messages output by other merging units.
(4) Receiving the power state of the isolation collector, and adjusting the output of the laser power supply according to the requirement
After the collected data are combined and processed, 3 paths of data collection signals are provided in a 100BASE-FX or 10BASE-FL mode conforming to IEEE802.3, and messages in a format specified by IEC60044-8 can also be transmitted in an FT3 format.
The system also comprises a check on the overall error in the following way:
a current and voltage sampling device in the merging unit collects primary signals of the electronic transformer and transmits the collected primary signals to an optical fiber transceiver in a standard digital electric energy meter in a standby mode;
the optical fiber transceiver transmits the received signals to a main control unit in a standard digital electric energy meter through a metering optical fiber for analysis, and the main control unit meters the analyzed signals.
Currently, the overall error is mainly composed of several aspects: the error of the digital electric energy meter and the error of the electronic transformer have no extra loop error due to the adoption of optical fiber transmission. The error of the electronic transformer consists of 2 parts, one part is a front end AD conversion error, and the other part is a merging unit rectification error. Consider now the direct embedding of the digital standard table into the merge unit device. The three-phase load is balanced theoretically, actually, the primary system load flow, namely a three-phase current and three-phase voltage value are not standard sine curves, the standard table directly adopts FT3 data, generally 200 points per cycle, and compared with a digital table received by a sampling value of 80 points per cycle, the precision of the standard table can be improved by one precision level, and the system overall error can be checked.
Principle based on merging cells check gauge: and the main processor is used for reading the data of the collector provided by the FPGA and organizing and processing the data according to the configuration information of the merging unit. The host processor provides 4 out of the 100BASE-FX or 10BASE-FL interfaces in accordance with IEEE802.3 specifications.
The auxiliary processor is an FPGA and is used for controlling A/D conversion, receiving data of up to 12-path collector modules, receiving synchronous signals, receiving and sending FT3 messages, and exchanging data with the main processor through an internal double-port RAM.
The A/D sampling part can sample 6 paths of analog signals output by the AC conversion module. And sending out the signals after being merged with the input signals of the collector.
The data processing analog provides a device alarm signal to the power module that shares a set of open relay contacts with the power alarm.
If a secondary device receives data output by a plurality of merging units at the same time, the merging units need to work synchronously, and when a synchronous signal is lost, the merging units inform the secondary device through a flag bit in a message.
The synchronization signal input is an optical fiber interface, and the shape of the optical signal is shown in fig. 8. Wherein,
(1) the synchronous time is the signal rising edge, and the triggering optical power is 50% of the maximum optical power;
(2) clock frequency: 1 Hz;
(3) the merging unit checks the rationality of the signals;
(4) duration t of pulseh>10μs；
(5) Pulse interval tl>500ms。
The whole system adopts an integrated secondary equipment non-pulse verification method:
the integrated secondary equipment device integrates functions of a combiner, protection, measurement and control, measurement and the like, belongs to an all-in-one device, and is mainly considered not to influence normal operation of measurement and protection during measurement and verification.
The integrated secondary equipment is provided with an analog small signal acquisition interface, supports millivolt output of a protection coil and volt output of a measuring coil of a low-voltage-level electronic transformer, has the capacity of receiving or transmitting IEC60044-8/FT3 protocol data, and provides an inter-bay synchronous input interface. The 100M optical fiber Ethernet port capable of receiving or transmitting the IEC61850-9-1 protocol can be seamlessly connected with a digital electric energy meter and the like, is integrated with an intelligent terminal function, and can be connected to a GOOSE network in a process layer. The device can communicate with the station control layer in the IEC61850 standard mode,
in terms of metering, its main functions are as follows:
1) the method realizes full electric quantity measurement and can measure various three-phase power parameters. The measured value can be displayed on the MMI in real time and can also be remotely transmitted to the electric energy acquisition device.
2) Has the function of remote communication. The DL/T645-2007 or DL/T645-1997 communication is carried out through the RS-485 communication interface, the measurement information and the parameter setting can be uploaded to the background monitoring host, remote centralized management and monitoring are realized, and a user can conveniently utilize the communication to program the system parameters. 3) And the 61850MMTR logical node is supported, and the communication with the 61850 main station can be realized through a communication port for protecting the CPU.
The digital electric energy metering node generally updates the electric energy data in the acquisition terminal by periodically uploading a report subscribed by a user, wherein the report generally comprises: active electric energy, reactive electric energy and data updating time, wherein the data updating time is accurate to 2-24 times of second and far exceeds the time accuracy of equipment; therefore, the measurement verification can be carried out by acquiring IEC61850-8-1 standard report data by referring to the digital power source method verification method of the digital electric energy meter standard.
The digital signal source outputs sampled data frame in DL/T860.91 or DL/T860.92 protocol, and the amplitude and phase of the voltage and current signals may be set based on practical requirement to obtain theoretical electric energy value W based on the configured parametersNObtaining a measured value of electric energy W from the detected electric energyX(ii) a The system has the following error checking modes for the digital electric energy meter to be checked:
in the formula: gamma is the relative error; wXRecording the electric energy of the digital electric energy meter to be detected; wNIs a theoretical electric energy value.
The digital signal source outputs sampled data frame in DL/T860.91 or DL/T860.92 protocol, the amplitude and phase of the voltage and current signals represented by the data frame may be set based on practical requirement, and the error calculator has stable time counter to obtain the electric energy value W at T1 time based on the sampled data frameN1And electric energy value W at time t2N2Go to and froThe over-receiving message obtains a power measurement value W at the time t 1' from the detected digital power metering nodeX1The measured value of the electric energy W at the time t2X2The times t1 and t1 ', t2 and t 2' do not need to be exactly the same, as long as they remain comparable: t1-t 1'<1s，t2-t2’<1 s; the system checks the error of the digital electric energy meter to be checked in the following way:
in the formula: t1-t 1'<1s，t2-t2’<1 s; gamma is the relative error; wN1The electric energy value at the time t 1; wN2The electric energy value at the time t 2; wX1Metering the electric energy recorded at the moment of the node t 1' for the digital electric energy meter to be detected; wX2The electric energy recorded at the moment of the node t 2' is measured for the digital electric energy meter to be checked.
As shown in fig. 7, the digitalized electric energy metering node is verified according to the integrated secondary device non-pulse verification method, when field verification is performed, an error calculator (or similar devices) can receive a report of the digitalized metering node to be tested as long as the error calculator (or similar devices) is accessed to a station control layer switch (MMS message) for metering in a transformer substation nearby, and is accessed to a bay layer switch (SMV message) in the transformer substation nearby, so that a sampling value message can be received without opening a closed device cabinet body to access electric energy pulses and the sampling value message, batch verification can be performed, and convenience and rapidness are achieved; during the experiment, two switch networks can be established: and the station control layer switch (MMS message) and the interval layer switch (SMV message) can also carry out batch verification.
And (3) overall checking error analysis:
according to the shannon sampling theorem, in the process of converting analog/digital signals, when the sampling frequency is greater than 2 times of the highest frequency in the signals, the sampled digital signals completely retain the information in the original signals, actually at least greater than 2 times and generally more than 4 times, otherwise, due to the quantization error of A/D, the calculation precision of a computer, the initial phase of sampling points and other reasons, the signals are difficult to restore in the 2 times, for example, two points of sampling just fall to the zero crossings of 0 degree and 180 degrees, so that the sampling value of A/D is 0, and the signals cannot be restored completely.
During real load verification, due to the fact that signals are possibly as low as 1Hz in the transient process or distortion load of a power grid, generally, only a few fundamental wave periodic signals are used for integration, so that low-frequency signals have truncation errors, and different sampling rates show different accuracies. The accuracy of different sampling rates is the same when the signal period of the fundamental is 50Hz and only integer multiples of harmonics (1/2 less than the sampling rate) are present. If the check meter still adopts the sampling of 80 points per cycle of the merging unit, the dot product and the error are 1.3337%, if the FT3 data is directly adopted, if the data is assumed to be 256 points, the data is-0.142%.
Active power errors at different sampling rates are shown in table 1 below by Matlab simulation errors.
TABLE 1 simulation error
| Number of sampling points | 40 | 80 | 256 |
| Dot product and error (%) | -5.8156 | 1.3337 | -0.142 |
| Simpson error (%) | 0.09058 | -0.01819 | 0.00016128 |
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. An integral error calibration system based on a merging unit comprises an electronic transformer, the merging unit, a digital electric energy meter and a multifunctional measurement and control device; the method is characterized in that:
the electronic transformer is connected with the merging unit and transmits a primary signal detected by the electronic transformer to the merging unit;
the merging unit is connected with the digital electric energy meter to be detected and is used for detecting the digital electric energy meter to be detected;
the merging unit is connected with an error comparison calculation module in a standard digital electric energy meter, and the merging unit verifies the digital electric energy meter to be detected through the error comparison calculation module;
the merging unit is also connected with the multifunctional measurement and control device.
2. The merging-unit-based overall error checking system according to claim 1, wherein the merging unit is embedded into a standard digital electric energy meter to form a checking standard digital electric energy meter for checking;
the method comprises the steps that a calibration standard digital electric energy meter collects primary signals output by an alternating current conversion module in an electronic transformer;
and the calibration standard digital electric energy meter simultaneously receives FT3 messages output by other merging units, and outputs the acquired primary signals and the received FT3 messages to the digital electric energy meter to be detected or a multifunctional measurement and control device in a message frame mode.
3. The merging unit-based overall error checking system of claim 1, wherein the electronic transformer comprises an electronic current transformer, an electronic voltage transformer;
an A/D conversion module is arranged in the electronic transformer, and the conversion principle of the A/D conversion module is as follows:
after the analog quantity signal is input into the electronic transformer, the analog quantity signal is transmitted to a CPU system through a low-pass filtering and analog-to-digital conversion module;
the optical fiber loop 1 transmits the power supply loop and the sampling interruption extraction loop to the CPU system; the CPU system feeds back to the fiber loop 2.
4. The merging-unit-based overall error checking system of claim 1, further comprising checking the overall error in the following manner:
a current and voltage sampling device in the merging unit collects primary signals of the electronic transformer and transmits the collected primary signals to an optical fiber transceiver in a standard digital electric energy meter in a standby mode;
the optical fiber transceiver transmits the received signals to a main control unit in a standard digital electric energy meter through a metering optical fiber for analysis, and the main control unit meters the analyzed signals.
5. The merging unit-based overall error checking system according to claim 1, wherein the system checks the errors of the digital electric energy meter to be checked in the following manner:
in the formula: gamma is the relative error; wXRecording the electric energy of the digital electric energy meter to be detected; wNIs a theoretical electric energy value.
6. The merging-unit-based overall error checking system according to claim 5, wherein when the digital signal source outputs the sampled value data frame conforming to the DL/T860.91 or DL/T860.92 protocol, the system checks the error of the digital electric energy meter to be checked in the following way:
in the formula: t1-t 1'<1s，t2-t2’<1 s; gamma is the relative error; wN1The electric energy value at the time t 1; wN2The electric energy value at the time t 2; wX1Metering the electric energy recorded at the moment of the node t 1' for the digital electric energy meter to be detected; wX2The electric energy recorded at the moment of the node t 2' is measured for the digital electric energy meter to be checked.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110764045A (en) * | 2019-11-26 | 2020-02-07 | 国网四川省电力公司电力科学研究院 | Verification system and verification method for digital metering of intelligent substation |
| CN110967663A (en) * | 2018-09-29 | 2020-04-07 | 武汉格蓝若智能技术有限公司 | Digital electric energy meter rapid calibration method suitable for field working conditions |
| CN111521315A (en) * | 2020-04-27 | 2020-08-11 | 国网福建省电力有限公司 | Method and system for detecting real load error of secondary part of digital metering device |
| CN112068061A (en) * | 2020-08-26 | 2020-12-11 | 中国电力科学研究院有限公司 | Electronic transformer error measuring device and method |
| CN114252695A (en) * | 2021-12-24 | 2022-03-29 | 国网甘肃省电力公司营销服务中心 | Integral calibration method and system for electric energy metering device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608450A (en) * | 2012-02-24 | 2012-07-25 | 江苏凌创电气自动化股份有限公司 | Testing and verifying system appropriate for intelligent transformer substation and verifying method |
| CN103792508A (en) * | 2014-01-27 | 2014-05-14 | 国家电网公司 | Error test system and method for digitized metering device |
| CN104062625A (en) * | 2014-06-27 | 2014-09-24 | 国家电网公司 | Digital electric energy metering device calibration equipment and method thereof |
| US20150141064A1 (en) * | 2004-11-18 | 2015-05-21 | Powersense A/S | Compensation of simple fiber optic faraday effect sensors |
| CN204694837U (en) * | 2015-06-26 | 2015-10-07 | 国家电网公司 | Pick-up unit |
-
2017
- 2017-12-19 CN CN201711376152.1A patent/CN108132455A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150141064A1 (en) * | 2004-11-18 | 2015-05-21 | Powersense A/S | Compensation of simple fiber optic faraday effect sensors |
| CN102608450A (en) * | 2012-02-24 | 2012-07-25 | 江苏凌创电气自动化股份有限公司 | Testing and verifying system appropriate for intelligent transformer substation and verifying method |
| CN103792508A (en) * | 2014-01-27 | 2014-05-14 | 国家电网公司 | Error test system and method for digitized metering device |
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Application publication date: 20180608 |