CN204789972U - Direct current instrument trans former check gauge of compatible analog quantity and digital quantity check -up function - Google Patents
Direct current instrument trans former check gauge of compatible analog quantity and digital quantity check -up function Download PDFInfo
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- CN204789972U CN204789972U CN201520342904.2U CN201520342904U CN204789972U CN 204789972 U CN204789972 U CN 204789972U CN 201520342904 U CN201520342904 U CN 201520342904U CN 204789972 U CN204789972 U CN 204789972U
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Abstract
The utility model provides a direct current instrument trans former check gauge of compatible analog quantity and digital quantity check -up function includes host system, analog input sampling module, digital quantity are inputed analytic module, clock synchronization module, man -machine interaction module and are the power module of corresponding module power supply, the check gauge is still including installing the interface as follows: clock synchronization interface, two at least analog input interfaces, at least one digital quantity input reticle mouth, the analog input interface links to each other with analog input sampling module, and analog input sampling module links to each other with host system, and digital quantity input reticle mouth links to each other with the analytic module of digital quantity input, and the clock synchronization module links to each other with the clock synchronization interface, and analog input sampling module, the analytic module of digital quantity input, clock synchronization module and man -machine interaction module link to each other with host system respectively. The utility model discloses the check gauge not only can but also can carry out the check -up to digital output type direct current instrument trans former to the analog output type.
Description
Technical field
The utility model relates to a kind of DC mutual inductor verification device, belongs to HVDC (High Voltage Direct Current) transmission system fields of measurement, can verify the direct current instrument transformer exported as analog quantity or digital quantity.
Background technology
In electric system, D.C. high voltage transmission is mainly used in remote bulk power transmission, contact etc. between subsea cable power transmission and the AC system of asynchronous operation.Direct current instrument transformer is measuring equipment important in DC transmission system, and the control and protection for system provides required measuring-signal.The stability of the accuracy that direct current instrument transformer is measured and operation has important impact to the monitoring of DC transmission system, protection and stable operation.Calibration test before installing direct current instrument transformer and period regulation ensure the indispensable work of DC transmission system safe operation.
At present, domestic conventional DC mutual inductor verification method is the error between the output of more tested direct current instrument transformer and the output of standard straight current transformer.Tested direct current instrument transformer has analog output type and two kinds, digital output type, standard straight current transformer generally is analog output type, interface for being connected with tested direct current instrument transformer on existing DC mutual inductor verification instrument generally only has digital-quantity input interface or analog input interface, can not take into account the verifying function of analog output type and digital output type direct current instrument transformer.Fig. 1 is only can the structured flowchart of tester of the tested direct current instrument transformer of calibration mode analog quantity output type, and Fig. 2 is only can the structured flowchart of tester of the tested direct current instrument transformer of check digit amount output type.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of DC mutual inductor verification instrument having analog input interface and digital-quantity input interface concurrently, it is as a kind of calibration measurement system, not only to analog output type but also can verify digital quantity output type direct current instrument transformer.
The utility model solves the problems of the technologies described above adopted technical scheme: the DC mutual inductor verification instrument of a kind of compatible analog amount and digital quantity verifying function, it is characterized in that, the power module that described tester comprises main control module, analog input sampling module, digital quantity input parsing module, clock synchronization module, human-computer interaction module and powers for corresponding module, described tester also comprises following device interface: clock synchronous interface, at least two analog input interfaces, at least one digital quantity input light network interfaces;
Described analog input interface is connected with described analog input sampling module, the analog signals that standard and the tested direct current instrument transformer of analog output type export is input to described analog input sampling module, described analog input sampling module is connected with described main control module, described main control module is sent to after the analog signals of input is converted to digital signal, described digital quantity input light network interface inputs parsing module with described digital quantity and is connected, the digital information that tested for digital output type direct current instrument transformer exports is input to described digital quantity input parsing module, described digital quantity input parsing module is connected with described main control module, the digital information of input is resolved, and the data after resolving are sent to described main control module, described clock synchronization module is connected with described clock synchronous interface, to be connected with the tested direct current instrument transformer of digital output type by described clock synchronous interface, described clock synchronization module is connected with described main control module, so that by the sampling clock of analog input sampling module described in described master control module controls, and then make the tested direct current instrument transformer of digital output type, the sampling clock of standard or analog output type direct current instrument transformer is synchronous, described main control module calculates the ratio of standard straight current transformer and the output of tested direct current instrument transformer according to the data that described analog input sampling module and described digital quantity input parsing module send, and result is sent to the display of described human-computer interaction module.
Described analog input interface comprises standard DC voltage transformer analog input interface, standard DC current transformer analog input interface, tested DC voltage transformer analog input interface and tested DC current transformer analog input interface.
Described analog input sampling module comprises several input sample passages, the input end of each input sample passage is connected with each analog input interface one_to_one corresponding, described input sample passage is made up of signal conditioning circuit and double A/D sample circuit, the analog voltage of input or current signal are with high fidelity converted into voltage small-signal for described double A/D sampling circuit samples by described signal conditioning circuit, described double A/D sample circuit is made up of the A/D converter that two have different frequency characteristic, two A/D converters are connected with described main control module with described signal conditioning circuit respectively, synchronized sampling under the control of the clock sync signal that two A/D converters transmit at described main control module, the low-frequency range of the voltage small-signal that described signal conditioning circuit of sampling respectively exports and Mid Frequency, and the digital signal obtained of sampling is sent to described main control module.The utility model utilizes the AD converter of two different frequency characteristics, the collection of AC and DC (low frequency) is separated, thus realizes the high precision of signal, wide region sampling.
Corresponding to each analog input interface, described signal conditioning circuit has following Four types:
The signal conditioning circuit corresponding with described standard DC voltage transformer analog input interface, the precision resistance division module adjustable by intrinsic standoff ratio and two voltage followers a, b are formed, the input end of described precision resistance division module is connected with described standard DC voltage transformer analog input interface by described voltage follower a, and output terminal is connected with the double A/D sample circuit of its place input sample passage by described voltage follower b;
The signal conditioning circuit corresponding with described standard DC current transformer analog input interface, be made up of Zero flux mutual inductor and high-accuracy resistance and voltage follower c, the input end of described Zero flux mutual inductor is connected with described standard DC current transformer analog input interface, the output terminal of described Zero flux mutual inductor is connected with the input end of described high-accuracy resistance, and the output terminal of described high-accuracy resistance is connected with the double A/D sample circuit of its place input sample passage by voltage follower c;
The signal conditioning circuit corresponding with described tested DC voltage transformer analog input interface, be made up of high-accuracy resistor voltage divider circuit a and voltage follower d, the input end of described high-accuracy resistor voltage divider circuit a is connected with described tested DC voltage transformer analog input interface, and output terminal is connected with the double A/D sample circuit of its place input sample passage by voltage follower d;
The signal conditioning circuit corresponding with described tested DC current transformer analog input interface, be made up of high-accuracy resistor voltage divider circuit b and voltage follower e, the input end of described high-accuracy resistor voltage divider circuit b is connected with described tested DC current transformer analog input interface, and output terminal is connected with the double A/D sample circuit of its place input sample passage by voltage follower e.
In above-mentioned signal conditioning circuit, the signal conditioning circuit structure of tested DC voltage, current transformer is substantially identical, this is because tested DC voltage transformer and tested DC current transformer all export analog voltage signal.And the difference between the signal conditioning circuit of standard DC voltage transformer and tested DC voltage, current transformer, because compared to tested DC voltage, current transformer, the output voltage range of standard DC voltage transformer is larger, and output impedance is higher.
Described power module comprises switch and increases income and precision voltage source module, described precision voltage source module is made up of insulating power supply and efficient linear stabilized voltage supply, described efficient linear stabilized voltage supply to be increased income with described switch by described insulating power supply and is connected, and described efficient linear stabilized voltage supply is connected with described analog input sampling module.Insulating power supply ensure that and the independence that analog input sampling module is powered prevents other power supply disturbance, and efficient linear stabilized voltage supply decreases the ripple of power supply, guarantees as analog input sampling module provides high-quality power supply.
Described clock synchronous interface comprises for providing the output clock sync cap of clock sync signal and the input clock sync cap for receiving external synchronization clock signal for the tested direct current instrument transformer of digital output type.As adopted merge cells etc., some have instrument or the equipment of clock synchronous output function, by clock synchronization module of the present utility model for tester of the present utility model and digital output type direct current instrument transformer provide synchronizing clock signals, thus the sampling clock realized inside and outside tester is synchronous.
The device interface of described tester also comprises Man Machine Interface, and described human-computer interaction module is connected with described main control module by described Man Machine Interface, and described human-computer interaction module have employed embedded system scheme.Described digital quantity input parsing module is by message, protocol analysis Algorithm constitution.
Described main control module is dsp processor.
Described clock synchronization module is made up of FPGA and field programmable gate array.
Compared with prior art, the utility model has following beneficial effect: 1) the utility model tester can the verification of compatible analog amount output type and digital output type direct current instrument transformer;
2) the utility model tester is by double A/D sample circuit, block sampling is carried out by frequency, not only can realize the sampling with high precision to direct current and low frequency signal, the part useful signal of Mid Frequency can also be taken into account, the utility model tester is made to realize, to the high precision of signal, wide region sampling, being conducive to the measuring accuracy improving tester;
3) the utility model tester realizes man-machine interaction by embedded system scheme, makes the utility model tester also have the advantages such as volume is little, portable.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is only can the structured flowchart of tester of the tested direct current instrument transformer of calibration mode analog quantity output type;
Fig. 2 is only can the structured flowchart of tester of the tested direct current instrument transformer of check digit amount output type;
Fig. 3 is the general frame of the present utility model;
Fig. 4 is the interface framework of tester;
Fig. 5 is analog input sampling module part composition frame chart;
Fig. 6 is precision voltage source modular structure schematic block diagram.
Embodiment
As shown in Figure 4, the device interface of the DC mutual inductor verification instrument of compatible analog amount of the present utility model and digital quantity verifying function comprises power interface, Man Machine Interface, clock synchronous interface, analog input interface, digital quantity input light network interface.
DC mutual inductor verification instrument in the present embodiment comprises 4 analog input interfaces, 2 digital quantity input light network interfaces, 2 clock synchronous interfaces.
4 analog input interfaces are respectively standard DC voltage transformer analog input interface, standard DC current transformer analog input interface, tested DC voltage transformer analog input interface and tested DC current transformer analog input interface, so that can the verification of compatible voltage and current analog output type direct current instrument transformer.
In 2 digital quantity input light network interfaces, one is arranged as spare interface.Digital quantity inputs the defeated light inlet of tested direct current instrument transformer digital quantity in light network interface and Fig. 2.
2 one, clock synchronous interfaces are output clock sync cap, and one is input clock sync cap.Output clock sync cap is used for providing clock sync signal for the tested direct current instrument transformer of digital output type, and input clock sync cap is for receiving external synchronization clock signal.The utility model tester unifies the tested direct current instrument transformer of digital output type, standard or the sampling clock of analog output type direct current instrument transformer and the clock signal of main control module by exporting synchronizing clock signals or receiving synchronizing clock signals.
Power interface is civil power 220V input interface.Man Machine Interface is convenient to be connected with human-computer interaction module (will talk about hereinafter).
Fig. 3 is theory diagram of the present utility model, and the DC mutual inductor verification instrument of compatible analog amount of the present utility model and digital quantity verifying function comprises main control module, analog input sampling module, digital quantity input parsing module, clock synchronization module, power module and human-computer interaction module.
Analog input interface is connected with analog input sampling module, by analog signals as voltage or current signal are input to analog input sampling module, analog input sampling module is sent to main control module after the analog signals of input is converted to digital signal.Digital quantity input light network interface inputs parsing module with digital quantity and is connected, and digital information is input to digital quantity input parsing module, and the digital information of digital quantity input parsing module to input is resolved, by the main control module that the data after resolving send.Human-computer interaction module is connected with main control module by Man Machine Interface, and main control module processes the signal sent, and by the data handled well as assay etc. by human-computer interaction module as liquid crystal display shows.Clock synchronization module is connected with main control module with clock synchronous interface.Clock synchronization module is exported or receive clock synchronizing signal by clock synchronous interface, thus make the clock synchronous of the tested direct current instrument transformer of digital output type and main control module, again by the sampling clock of master control module controls analog input sampling module, to make the sampling clock of the tested direct current instrument transformer of digital output type, standard or analog output type direct current instrument transformer synchronous.Power module comprises Switching Power Supply and precision voltage source module, and precision voltage source module is connected with analog input sampling module, for analog input sampling module provides the power supply of high-quality.
Fig. 5 is the theory diagram of analog input sampling module, and as shown in Figure 5, analog input sampling module comprises 4 road input sample passages, and the input end of each input sample passage is connected with each analog input interface one_to_one corresponding.Input sample passage is made up of signal conditioning circuit and double A/D sample circuit.4 road input sample passages are respectively standard DC voltage transformer input sample passage, standard DC current transformer input sample passage, analog output type tested DC voltage transformer input sample passage, analog output type tested DC current transformer input sample passage.
The analog voltage of input or current signal are with high fidelity converted into the small-signal that A/D sample circuit can be sampled by signal conditioning circuit:
The analog voltage signal that standard DC voltage transformer exports is divided into voltage small-signal by high-accuracy electric resistance partial pressure module, because the output voltage range of standard DC voltage transformer is larger: 0 ~ 120V, output impedance is higher: be about 10K, therefore need to adopt the voltage follower a of the high pressure amplifier of high input impedance composition to do prime isolation, kept the sampling precision of high terminal voltage and lower terminal voltage by the intrinsic standoff ratio switching high-accuracy electric resistance partial pressure module, the voltage small-signal after dividing potential drop exports double A/D sample circuit to by a voltage follower b again; In the present embodiment, the intrinsic standoff ratio (i.e. the switching of 50:1/5:1) of high-accuracy electric resistance partial pressure module is realized by the switching of Control precision resistance by the DSP of main control module;
The analog current signal that standard DC current transformer exports, by being converted into voltage small-signal after Zero flux mutual inductor and high-accuracy resistance, exports double A/D sample circuit to after a voltage follower c;
Tested DC voltage transformer and tested DC current transformer all export analog voltage signal, the analog voltage signal that they export is divided into voltage small-signal through high-accuracy resistor voltage divider circuit a, b respectively, then after voltage follower d, e, exports respective double A/D sample circuit to respectively.
The precision comparison of conventional, electric-resistance is low, is generally 5% ~ 10%.The precision comparison of high-accuracy resistance is high, and some can reach ten thousand/, and degree of stability, temperature drift are smaller, the high-accuracy resistance applied in the present embodiment, temperature drift: 1PPM, precision: 0.1%, the utility model adopts high-accuracy resistance can improve the precision of the voltage signal obtained.
Double A/D sample circuit realizes synchronized sampling under the control of main control module DSP, and the CLK clock that their sample frequency is exported by DSP determines, CLK clock is configured by DSP.By the clock of the synchronous main control module of clock synchronization module and the tested direct current instrument transformer of digital output type, controlled the sample frequency of double A/D sample circuit again by DSP, thus make the sampling clock of the tested direct current instrument transformer of digital output type and standard or analog output type direct current instrument transformer synchronous.
The process that DSP controls the sampling clock of double A/D sample circuit is as follows: according to the sampling number of digital output type tested direct current instrument transformer institute nominal, (sampling number refers to every cycle sampled value number, first-harmonic is power frequency 50HZ, IEC60044-8 standard specifies that electronic current mutual inductor (ECT)/electronics be the nominal sampling frequency of voltage transformer (VT) (EVT) is 20 times, 40 times, any one of 80 times, the frequency of mutual inductor is power frequency 50Hz, and corresponding sample frequency is 1KHz, 2.4KHz, 4KHz, namely correspondence is counted is 20, 40, 80 points), it is set in DSP by human-computer interaction module, DSP control CLK clock, realize standard or analog output type direct current instrument transformer is synchronous with the sampling clock of the tested direct current instrument transformer of digital output type.
Double A/D sample circuit comprises two A/D converters, two A/D converters are connected with main control module with signal conditioning circuit respectively, two A/D converters receive the clock sync signal startup A/D sampling of main control module transmission respectively, two A/D converters have different frequency characteristics, are respectively used to low-frequency range and the Mid Frequency of the voltage small-signal that sampled signal modulate circuit exports.The utility model utilizes the AD converter of two different frequency characteristics, the collection of AC and DC (low frequency) is separated.Low frequency A/D converter adopts the ADS1278 of TI company, and 24 conversion accuracies meet low-frequency sampling requirement completely.Low frequency A/D converter gathers below 5Hz useful signal and filters the fractional-sample value beyond useful signal frequency range in conjunction with FIR low pass filter algorithm, intermediate frequency A/D converter adopts AD7608,18 conversion accuracies, intermediate frequency A/D converter gathers 50Hz-1200Hz useful signal and also filters low frequency part, the HFS sampled value outside useful signal frequency range in conjunction with FIR bandpass filter algorithm, adopts double A/D sample circuit to realize high precision to signal, wide region collection.The digital signal obtained after A/D sampling is sent to main control module and processes.
Main control module comprises processor platform and bottom control program.Processor platform adopts the double-nuclear DSP processor A DSP609 of ADI company, and extends out the DDR isochronous memory of 128M and the asynchronous access Flash of 32M, for tester provides powerful signal handling capacity.Bottom control program is the control center of whole processor platform.
Digital quantity parsing module is mainly resolved the proprietary protocol of IEC61850 message data and each producer, and the proprietary protocol of IEC61850 message and each producer is resolved to discernible magnitude of voltage, current value, control signal etc.
Clock synchronization module is directly by FPGA and field programmable gate array programming realization, it uses the high capability flash type FPGA of ACTEL to provide accurate pulse to export, PPS pulse per second (PPS) and IRIG-B code synchronizing clock signals can be provided by gps clock source, also built-in high accuracy real-time clock can be used to provide synchronizing clock signals, can carry out clock timing by IEEE1588 agreement in addition provides synchronous clock to export, further simplify synchronous function, and its timing error is less than 1us.Clock synchronization module utilizes FPGA to realize hardware markers, greatly promotes the accuracy of clock synchronous, and the sample-synchronous error between standard straight current transformer and tested direct current instrument transformer is reduced greatly.Clock synchronization module also can receive outside PPS pulse per second (PPS) as clock sync signal simultaneously.
Fig. 6 is the structured flowchart of precision voltage source module.The precision voltage source module of tester is made up of insulating power supply and efficient linear stabilized voltage supply, efficient linear stabilized voltage supply is connected with Switching Power Supply by insulating power supply, and efficient linear stabilized voltage supply is connected with double A/D sample circuit respectively with the signal conditioning circuit of analog input sampling module.Insulating power supply ensure that and the independence that analog input sampling module is powered prevents other power supply disturbance.Connect efficient linear stabilized voltage supply after insulating power supply, decrease the ripple of power supply, guarantee as analog input sampling module provides high-quality power supply.The efficiency of normal linear stabilized voltage supply is very low, only has 30%-40%, efficient linear stabilized voltage supply is high compared to the efficiency of normal linear stabilized voltage supply, if the efficient linear stabilized voltage supply load regulation in the present embodiment is lower than 0.4%, line regulation is lower than 0.2%, 10MA Ripple Suppression ratio at least 60dB, during fully loaded output, efficiency can reach 60%.
The human-computer interaction module of tester of the present utility model have employed embedded system scheme and instead of industrial computer scheme of the prior art, namely the program controlling to show operates on DSP, utilize embedded UI to realize human-computer interaction interface, make system architecture compacter.In addition, human-computer interaction module adopts liquid crystal display to show, and conveniently checks parameters configuration and check results etc.
Claims (9)
1. the DC mutual inductor verification instrument of a compatible analog amount and digital quantity verifying function, it is characterized in that, the power module that described tester comprises main control module, analog input sampling module, digital quantity input parsing module, clock synchronization module, human-computer interaction module and powers for corresponding module, described tester also comprises following device interface: clock synchronous interface, at least two analog input interfaces, at least one digital quantity input light network interfaces;
Described analog input interface is connected with described analog input sampling module, the analog signals that standard and the tested direct current instrument transformer of analog output type export is input to described analog input sampling module, described analog input sampling module is connected with described main control module, described main control module is sent to after the analog signals of input is converted to digital signal, described digital quantity input light network interface inputs parsing module with described digital quantity and is connected, the digital information that tested for digital output type direct current instrument transformer exports is input to described digital quantity input parsing module, described digital quantity input parsing module is connected with described main control module, the digital information of input is resolved, and the data after resolving are sent to described main control module, described clock synchronization module is connected with described clock synchronous interface, to be connected with the tested direct current instrument transformer of digital output type by described clock synchronous interface, described clock synchronization module is connected with described main control module, so that by the sampling clock of analog input sampling module described in described master control module controls, and then make the tested direct current instrument transformer of digital output type, the sampling clock of standard or analog output type direct current instrument transformer is synchronous, described main control module calculates the ratio of standard straight current transformer and the output of tested direct current instrument transformer according to the data that described analog input sampling module and described digital quantity input parsing module send, and result is sent to the display of described human-computer interaction module.
2. DC mutual inductor verification instrument according to claim 1, it is characterized in that, described power module comprises switch and increases income and precision voltage source module, described precision voltage source module is made up of insulating power supply and efficient linear stabilized voltage supply, described efficient linear stabilized voltage supply to be increased income with described switch by described insulating power supply and is connected, and described efficient linear stabilized voltage supply is connected with described analog input sampling module.
3. DC mutual inductor verification instrument according to claim 1, it is characterized in that, described clock synchronous interface comprises for providing the output clock sync cap of clock sync signal and the input clock sync cap for receiving external synchronization clock signal for the tested direct current instrument transformer of digital output type.
4. DC mutual inductor verification instrument according to claim 1, it is characterized in that, the device interface of described tester also comprises Man Machine Interface, described human-computer interaction module is connected with described main control module by described Man Machine Interface, and described human-computer interaction module have employed embedded system scheme.
5. DC mutual inductor verification instrument according to claim 1, is characterized in that, described main control module is dsp processor.
6. DC mutual inductor verification instrument according to claim 1, is characterized in that, described clock synchronization module is made up of FPGA and field programmable gate array.
7. the DC mutual inductor verification instrument according to any one of claim 1 ~ 6 claim, it is characterized in that, described analog input interface comprises standard DC voltage transformer analog input interface, standard DC current transformer analog input interface, tested DC voltage transformer analog input interface and tested DC current transformer analog input interface.
8. DC mutual inductor verification instrument according to claim 7, it is characterized in that, described analog input sampling module comprises several input sample passages, the input end of each input sample passage is connected with each analog input interface one_to_one corresponding, described input sample passage is made up of signal conditioning circuit and double A/D sample circuit, the analog voltage of input or current signal are with high fidelity converted into voltage small-signal for described double A/D sampling circuit samples by described signal conditioning circuit, described double A/D sample circuit is made up of the A/D converter that two have different frequency characteristic, two A/D converters are connected with described main control module with described signal conditioning circuit respectively, synchronized sampling under the control of the clock sync signal that two A/D converters transmit at described main control module, the low-frequency range of the voltage small-signal that described signal conditioning circuit of sampling respectively exports and Mid Frequency, and the digital signal obtained of sampling is sent to described main control module.
9. DC mutual inductor verification instrument according to claim 8, is characterized in that, corresponding to each analog input interface, described signal conditioning circuit has following Four types:
The signal conditioning circuit corresponding with described standard DC voltage transformer analog input interface, the precision resistance division module adjustable by intrinsic standoff ratio and two voltage followers a, b are formed, the input end of described precision resistance division module is connected with described standard DC voltage transformer analog input interface by described voltage follower a, and output terminal is connected with the double A/D sample circuit of its place input sample passage by described voltage follower b;
The signal conditioning circuit corresponding with described standard DC current transformer analog input interface, be made up of Zero flux mutual inductor and high-accuracy resistance and voltage follower c, the input end of described Zero flux mutual inductor is connected with described standard DC current transformer analog input interface, the output terminal of described Zero flux mutual inductor is connected with the input end of described high-accuracy resistance, and the output terminal of described high-accuracy resistance is connected with the double A/D sample circuit of its place input sample passage by voltage follower c;
The signal conditioning circuit corresponding with described tested DC voltage transformer analog input interface, be made up of high-accuracy resistor voltage divider circuit a and voltage follower d, the input end of described high-accuracy resistor voltage divider circuit a is connected with described tested DC voltage transformer analog input interface, and output terminal is connected with the double A/D sample circuit of its place input sample passage by voltage follower d;
The signal conditioning circuit corresponding with described tested DC current transformer analog input interface, be made up of high-accuracy resistor voltage divider circuit b and voltage follower e, the input end of described high-accuracy resistor voltage divider circuit b is connected with described tested DC current transformer analog input interface, and output terminal is connected with the double A/D sample circuit of its place input sample passage by voltage follower e.
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| CN201520342904.2U CN204789972U (en) | 2015-05-26 | 2015-05-26 | Direct current instrument trans former check gauge of compatible analog quantity and digital quantity check -up function |
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| CN201520342904.2U CN204789972U (en) | 2015-05-26 | 2015-05-26 | Direct current instrument trans former check gauge of compatible analog quantity and digital quantity check -up function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833941A (en) * | 2015-05-26 | 2015-08-12 | 广东电网有限责任公司电力科学研究院 | DC mutual inductor check meter combining analog quantity and digital quantity verification function |
| CN106646321A (en) * | 2016-11-18 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | DC current transformer synchronous calibration method and system |
| CN106772189A (en) * | 2016-11-18 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of DC voltage transformer synchronous calibration method and system |
| CN110488216A (en) * | 2019-09-20 | 2019-11-22 | 云南电网有限责任公司电力科学研究院 | A kind of digital output DCVT field calibration system |
-
2015
- 2015-05-26 CN CN201520342904.2U patent/CN204789972U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833941A (en) * | 2015-05-26 | 2015-08-12 | 广东电网有限责任公司电力科学研究院 | DC mutual inductor check meter combining analog quantity and digital quantity verification function |
| CN104833941B (en) * | 2015-05-26 | 2017-03-08 | 广东电网有限责任公司电力科学研究院 | A kind of compatible analog amount and the DC mutual inductor verification instrument of digital quantity verifying function |
| CN106646321A (en) * | 2016-11-18 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | DC current transformer synchronous calibration method and system |
| CN106772189A (en) * | 2016-11-18 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of DC voltage transformer synchronous calibration method and system |
| CN106646321B (en) * | 2016-11-18 | 2023-10-27 | 云南电网有限责任公司电力科学研究院 | Synchronous calibration method and system for direct current transformer |
| CN106772189B (en) * | 2016-11-18 | 2023-11-21 | 云南电网有限责任公司电力科学研究院 | Synchronous calibration method and system for direct-current voltage transformer |
| CN110488216A (en) * | 2019-09-20 | 2019-11-22 | 云南电网有限责任公司电力科学研究院 | A kind of digital output DCVT field calibration system |
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