CN204758814U - Online metrological verification device of high accuracy three -phase electric energy - Google Patents
Online metrological verification device of high accuracy three -phase electric energy Download PDFInfo
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Abstract
The utility model provides an online metrological verification device of high accuracy three -phase electric energy, power management system respectively with data acquisition system, FPGA data analysis system and ARM information display and communication system connection provide the power, data acquisition system gathers the signal and carries on the FPGA data analysis system who connects with it, the signal of FPGA data analysis system after with analysis is carried on the ARM information display and communication system who connects with it, last temperature sensor and the electric energy pulser of still being connected with of FPGA data analysis system, be connected with keyboard control system on ARM information display and the communication system, the ethernet interface, 232 serial port communication and liquid crystal display, the device drift of the degree of accuracy under the different environment temperature is corrected through the temperature compensating system, measurement accuracy grade is higher than 0.05 grade, has the high reliability, characteristics such as high accuracy, the demand of measurement of the online high accuracy of three -phase electric energy and on -the -spot electric energy meter check -up has been satisfied.
Description
Technical field
The utility model relates to electric-power metering calibrating field, is specifically related to a kind of high precision three-phase electric energy on-line metering calibrating installation.
Background technology
Along with the fast development of economy, the demand of all trades and professions to electric power is increasing, the voucher that electric energy meter is concluded the business as power supply enterprise and Electricity customers, and its accuracy is directly connected to the economic interests of both sides and the fairness of electricity transaction.The three-phase electric energy meter grade that current China uses is generally 0.5 grade or 0.2 grade, its verification mode generally adopts offline mode, under specific load, carry out accuracy estimating, and specific load can not the actual conditions of simulated field load well, accuracy and the reliability of verification are poor.The metering accuracy of electric energy meter in Long-Time Service process and under specific load (fluctuating load, impact load) can be affected, and reliability and metering accuracy decline.
The requirement needs that can existing electric energy meter meet situ metrology carry out on-line testing.Therefore, need a kind of high-precision can the three-phase electric energy metering device of on-line metering and verification, meet field electric energy measurement and electrical energy meter calibration demand.
Utility model content
The utility model provides a kind of high precision three-phase electric energy on-line metering calibrating installation according to the deficiencies in the prior art, and metering accuracy grade, higher than 0.05 grade, has the feature such as high reliability, high precision.
The technical solution of the utility model: a kind of high precision three-phase electric energy on-line metering calibrating installation, comprise power-supply management system, data acquisition system (DAS), FPGA data analysis system and ARM information displaying and communication system, it is characterized in that: described power-supply management system respectively with data acquisition system (DAS), FPGA data analysis system is connected with ARM information displaying and communication system and provides power supply, data acquisition system signal is transported on the FPGA data analysis system that is attached thereto, signal after computational analysis is transported on the ARM information displaying and communication system that are attached thereto by FPGA data analysis system, FPGA data analysis system is also connected with temperature sensor and electrical energy pulse device, ARM information displaying and communication system are connected with keyboard control system, Ethernet interface, 232 serial communications and LCDs.
Described power-supply management system comprises 220V Switching Power Supply, battery module, linear power supply modular converter and high-frequency switching power supply module, 220V Switching Power Supply connects battery module and is its charging, linear power supply modular converter and high-frequency switching power supply module parallel connection and be connected battery module or 220V Switching Power Supply by single-pole double-throw switch (SPDT).
Described data acquisition system (DAS) comprises A/D data acquisition system (DAS), voltage sensor is connected with A/D data acquisition system (DAS) by voltage signal conditioning circuit, current transformer is connected with A/D data acquisition system (DAS) by current signal conditioning circuit, and current clamp node is connected with A/D data acquisition system (DAS) by current clamp signal conditioning circuit.
The A/D converter that described A/D data acquisition system (DAS) adopts is 24 bit pads.
Technique effect of the present utility model: this device adopts 24 A/D chips, high-performance FPGA and ARM to carry out data acquisition, calculating and display.Device accuracy drift is at different ambient temperatures corrected by temperature-compensated system.The metering accuracy grade of device, higher than 0.05 grade, has the feature such as high reliability, high precision, meets the demand of the online high-precision measuring of three-phase electric energy and the verification of field electric energy table.
Accompanying drawing explanation
Fig. 1 is the utility model one-piece construction schematic diagram;
Fig. 2 is the utility model power-supply management system schematic diagram;
Fig. 3 is the utility model data acquisition system (DAS) schematic diagram.
Number in the figure represents respectively: 1-power-supply management system, 2-data acquisition system (DAS), 3-FPGA data analysis system, 4-ARM information displaying and communication system, 5-temperature sensor, 6-keyboard control system, 7-electrical energy pulse device, 8-Ethernet interface, 9-232 serial communications, 10-LCDs, 11-220V Switching Power Supply, 12-battery module, 13-power transfer module, 14-high-frequency switching power supply module, 21-voltage sensor, 22-current transformer, 23-current clamp node, 24-voltage signal conditioning circuit, 25-current signal conditioning circuit, 26-current clamp signal conditioning circuit, 27-A/D data acquisition system (DAS).
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated:
As shown in Figure 1 to Figure 3, a kind of high precision three-phase electric energy on-line metering calibrating installation, comprise power-supply management system 1, data acquisition system (DAS) 2, FPGA data analysis system 3 and ARM information displaying and communication system 4, it is characterized in that: described power-supply management system 1 respectively with data acquisition system (DAS) 2, FPGA data analysis system 3 is connected with ARM information displaying and communication system 4 and provides power supply, data acquisition system (DAS) 2 collection signal is transported on the FPGA data analysis system 3 that is attached thereto, signal after computational analysis is transported on the ARM information displaying and communication system 4 that are attached thereto by FPGA data analysis system 3, FPGA data analysis system 3 is also connected with temperature sensor 5 and electrical energy pulse device 7, ARM information displaying and communication system 4 are connected with keyboard control system 6, Ethernet interface 8, 232 serial communications 9 and LCDs 10.
Described power-supply management system 1 comprises 220V Switching Power Supply 11, battery module 12, linear power supply modular converter 13 and high-frequency switching power supply module 14,220V Switching Power Supply 11 connects battery module 12 and is its charging, linear power supply modular converter 13 and high-frequency switching power supply module 14 parallel connection and be connected battery module 12 or 220V Switching Power Supply 11 by single-pole double-throw switch (SPDT).
Described data acquisition system (DAS) 2 comprises A/D data acquisition system (DAS) 27, voltage sensor 21 is connected with A/D data acquisition system (DAS) 27 by voltage signal conditioning circuit 24, current transformer 22 is connected with A/D data acquisition system (DAS) 27 by current signal conditioning circuit 25, and current clamp node 23 is connected with A/D data acquisition system (DAS) 27 by current clamp signal conditioning circuit 26.
The A/D converter that described A/D data acquisition system (DAS) 27 adopts is 24 bit pads.
The utility model realizes in the following manner:
Step one: signal acquiring system is made up of voltage sensor, current sensor, current clamp node, signal conditioning circuit and A/D acquisition system.In order to meet the requirement of device accuracy, the class of accuracy of sensor requires to be not less than 0.02 grade.The error of signal conditioning circuit and A/D acquisition system is less than 1.
(1) voltage sensor adopts high-precision electric resistance partial pressure sensor, the range of signal adopting linear attenuation to allow to signal conditioning circuit the voltage signal of input.In order to reduce the electromagnetic interference (EMI) between voltage sensor, adopt the high metal of magnetoconductivity to shield, this shield adopts single-point grounding mode to be connected to PE end.
(2) current sensor adopts mutual inductor mode 0 ~ 120A big current to be transformed into the small area analysis of 0 ~ 1A, then carries out current/voltage conversion by high-accuracy resistance.Current transformer need adopt all-metal shielding mode, reduces between different coil and the electromagnetic interference (EMI) in the external world.
(3) signal conditioning circuit adopts high-precision instrumentation amplifier, adopts Differential Input mode, the common mode interference in erasure signal, by the range of signal required for input signal conditioning to A/D conversion.The signal that signal conditioning circuit exports through anti-aliasing filter, then need be input in A/D converter.
(4) A/D acquisition system adopts 2 high-precision multichannel 24 A/D to gather voltage, current signal and current clamp signal respectively.A/D acquisition system sample frequency is 25.6k, and in order to ensure that the synchronism gathered adopts unified pulse to trigger, transformation result is transferred in FPGA by parallel port.Collection and the clock control of this chip are completed by FPGA.
Step 2: FPGA data analysis system is analyzed the voltage gathered, current signal, calculates corresponding electrical quantity.According to the systematic error of the demarcation of each road measuring-signal, adopt error correcting method, will the systematic error in the measuring-signal of each road be eliminated.By the temperature measuring equipment in harvester, by the impact of off-line analysis temperature on each road measuring-signal, adopt the temperature drift of temperature error correcting mode to each sensor and signal conditioning circuit to calibrate, reduce the impact of temperature drift on measuring-signal accuracy.Corresponding algorithm is utilized to calculate the voltage of required metering, electric current, applied power, active power, reactive power, frequency, the parameter such as phasing degree and harmonic wave.When device is operated under gage work pattern, the electric energy of calculating adopts the mode of pulse to export by FPGA; When being operated in calibrating pattern, the pulse of input is counted.
Step 3: ARM information displaying and communication system major function are communication, display and control.ARM mainly adopts winCE system, is communicated with FPGA by SPI mode, and Keyboard Control and operational order in ARM, and are transferred in FPGA by the parameter transmission calculated by FPGA.ARM can also receive by Ethernet interface and 232 serial ports order that other terminal transmission comes and by information transmission to other terminal.The result that ARM is measured by LCDs display or examined and determine.ARM, by communicating with time module, accurately obtains system time.Power-supply management system is the emphasis of system: this system module provides accurate power supply.System adopts single-phase 220V to power, when there is external power supply, by switch power module to system power supply; When without external power supply, adopt 14.7V battery to system power supply.Power Management Design structural drawing as shown in Figure 2.Obtain the 15V power supply required for system input by switch power module, this power supply both can charge for battery, also can be other Power supply.Employing single-pole double-throw switch (SPDT) carries out the switching between Switching Power Supply and battery module.Linear power supply module mimic channel provides ± 12V and 5V, and high frequency switch power provides 5V, 3.3V and 1.2V power supply for digital circuit, adopts different power supply signals for disparate modules.In the Anti-interference Design of ground wire, separate in analog and digitally, concentrate on certain some employing 0 Ω resistance and connect.
Claims (4)
1. a high precision three-phase electric energy on-line metering calibrating installation, comprise power-supply management system (1), data acquisition system (DAS) (2), FPGA data analysis system (3) and ARM information displaying and communication system (4), it is characterized in that: described power-supply management system (1) respectively with data acquisition system (DAS) (2), FPGA data analysis system (3) is connected with ARM information displaying and communication system (4) and provides power supply, data acquisition system (DAS) (2) collection signal is transported on the FPGA data analysis system (3) that is attached thereto, signal after computational analysis is transported on the ARM information displaying and communication system (4) that are attached thereto by FPGA data analysis system (3), FPGA data analysis system (3) is also connected with temperature sensor (5) and electrical energy pulse device (7), ARM information displaying and communication system (4) are connected with keyboard control system (6), Ethernet interface (8), 232 serial communications (9) and LCDs (10).
2. a kind of high precision three-phase electric energy on-line metering calibrating installation according to claim 1, it is characterized in that: described power-supply management system (1) comprises 220V Switching Power Supply (11), battery module (12), linear power supply modular converter (13) and high-frequency switching power supply module (14), 220V Switching Power Supply (11) connects battery module (12) and is its charging, linear power supply modular converter (13) and high-frequency switching power supply module (14) are in parallel and be connected battery module (12) or 220V Switching Power Supply (11) by single-pole double-throw switch (SPDT).
3. a kind of high precision three-phase electric energy on-line metering calibrating installation according to claim 1, it is characterized in that: described data acquisition system (DAS) (2) comprises A/D data acquisition system (DAS) (27), voltage sensor (21) is connected with A/D data acquisition system (DAS) (27) by voltage signal conditioning circuit (24), current transformer (22) is connected with A/D data acquisition system (DAS) (27) by current signal conditioning circuit (25), current clamp node (23) is connected with A/D data acquisition system (DAS) (27) by current clamp signal conditioning circuit (26).
4. a kind of high precision three-phase electric energy on-line metering calibrating installation according to claim 3, is characterized in that: the A/D converter that described A/D data acquisition system (DAS) (27) adopts is 24 bit pads.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520378632.1U CN204758814U (en) | 2015-06-03 | 2015-06-03 | Online metrological verification device of high accuracy three -phase electric energy |
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| CN201520378632.1U CN204758814U (en) | 2015-06-03 | 2015-06-03 | Online metrological verification device of high accuracy three -phase electric energy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107515380A (en) * | 2017-07-20 | 2017-12-26 | 国网安徽省电力公司亳州供电公司 | A kind of single-phase zone load electric energy table on-site calibrator |
| CN108646090A (en) * | 2018-07-17 | 2018-10-12 | 浙江易享节能技术服务股份有限公司 | ammeter and ammeter control system |
| CN114019439A (en) * | 2021-10-28 | 2022-02-08 | 国网河北省电力有限公司雄安新区供电公司 | Metering module for verification system suitable for various-range direct current standard meters |
-
2015
- 2015-06-03 CN CN201520378632.1U patent/CN204758814U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107515380A (en) * | 2017-07-20 | 2017-12-26 | 国网安徽省电力公司亳州供电公司 | A kind of single-phase zone load electric energy table on-site calibrator |
| CN108646090A (en) * | 2018-07-17 | 2018-10-12 | 浙江易享节能技术服务股份有限公司 | ammeter and ammeter control system |
| CN108646090B (en) * | 2018-07-17 | 2024-05-03 | 浙江易享节能技术服务股份有限公司 | Ammeter and ammeter control system |
| CN114019439A (en) * | 2021-10-28 | 2022-02-08 | 国网河北省电力有限公司雄安新区供电公司 | Metering module for verification system suitable for various-range direct current standard meters |
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