CN204166121U - Based on the electric energy meter field calibration system of satellite navigation system - Google Patents
Based on the electric energy meter field calibration system of satellite navigation system Download PDFInfo
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- CN204166121U CN204166121U CN201420672460.4U CN201420672460U CN204166121U CN 204166121 U CN204166121 U CN 204166121U CN 201420672460 U CN201420672460 U CN 201420672460U CN 204166121 U CN204166121 U CN 204166121U
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Abstract
The utility model discloses the electric energy meter field calibration system based on satellite navigation system, it comprises voltage-frequency modular converter, processing module and satellite time transfer module, the input end of voltage-frequency modular converter is connected with standard signal source, the rate-adaptive pacemaker of voltage-frequency modular converter is connected with the input of processing module frequency, processing module is connected with electric energy meter to be calibrated by communication bus, the calibration command of processing module and the acquisition of electrical quantity are all undertaken alternately by communication bus, the electrical energy pulse input of processing module exports with the electrical energy pulse of electric energy meter to be calibrated and is connected, satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the output of satellite time transfer module respectively with standard signal source, voltage-frequency modular converter is connected with the clock input of processing module, processing module also manages main station system by communication module and electric energy meter and is connected.Measurement result of the present utility model and calibration result accurate, credible, reliable, can trace to the source.
Description
Technical field
The utility model relates to signal delicate metering field, particularly relates to a kind of electric energy meter field calibration system based on satellite navigation system.
Background technology
At present, the calibration of electric energy meter all completes in Measurement Laboratory.Within the serviceable life of electric energy meter, also will through periodic calibration.The table meter that precision is high, it is shorter for interval time that inspection in its week counted by the table of important events.The table meter of this kind of important events, due to substantial amounts, has been difficult to the periodic calibration of regulation.Do not carry out the table meter of periodic calibration, its error in dipping is unknown.Owing to there is these uncertain factors, cause electric-power metering mistake, bring massive losses to country every year.
Present most of power department mainly uses on-site calibrator to compare.Because on-site calibrator is by the impact of self principle of work, measuring accuracy, on-the-spot voltage of power, current fluctuation, calibration can not be realized, can only compare.The measurement result of this calibrating installation also can only be as a reference.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of electric energy meter field calibration system based on satellite navigation system is provided, realize the field calibration work of electric energy meter management main station system Long-distance Control electric energy meter, it is measured and calibration result has high precision, credibility, reliability and tractability.
The purpose of this utility model is achieved through the following technical solutions: based on the electric energy meter field calibration system of satellite navigation system, it comprises electric energy meter voltage measurement loop, electric energy meter current measurement loop, and it also comprises voltage-frequency modular converter, processing module, satellite time transfer module, communication module and electric energy meter management main station system.
Single-phase/three-phase standard signal source produces to meet and lands the alternating message source of single-phase, phase three-wire three that state requires or three-phase four-wire system, single-phase/three-phase standard signal source exports three road voltage AC signal and three road electric current AC signal, its voltage AC signal exported is connected with electric energy meter voltage measurement loop, electric energy meter current measurement loop respectively with electric current AC signal, and its voltage AC signal exported also is connected with voltage-frequency modular converter respectively with electric current AC signal.
The input end of described voltage-frequency modular converter is connected with the output signal of single-phase/three-phase standard signal source, and the output of voltage-frequency modular converter is connected with processing module.
Described processing module is connected with electric energy meter to be calibrated by communication bus, and the calibration command of processing module and the acquisition of electrical quantity are all undertaken alternately by communication bus, and the electrical energy pulse input of processing module exports with the electrical energy pulse of electric energy meter to be calibrated and is connected.
Described satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the output of satellite time transfer module is connected with the clock input of standard signal source, voltage-frequency modular converter and processing module respectively, for standard signal source, voltage-frequency modular converter and processing module provide clock reference.
Described processing module also manages main station system by communication module and electric energy meter and is connected.
Described satellite time transfer module comprises satellite time transfer treatment circuit and high steady constant temperature crystal circuit.
Described satellite time transfer module comprises any one or multiple combination in gps satellite time service module, big-dipper satellite time service module, GLONASS satellite time transfer module and Galilean satellite time service module.
Described communication module comprises one or more the combination in wire communication module and wireless communication module.
Described wire communication module comprises one or more the combination in RJ45 communication module, RS232 communication module and RS485 communication module.
Described wireless communication module comprises one or more the combination in gsm communication module, GPRS communication module and satellite communication module.
The beneficial effects of the utility model are: the utility model realizes the field calibration work of electric energy meter management main station system Long-distance Control electric energy meter, and it is measured and calibration result has high precision, credibility, reliability and tractability.
The utility model electric energy meter calibration system is by voltage-frequency modular converter, convert the AC signal that standard signal source produces to corresponding frequency signal, then the high accurate clock signal utilizing satellite navigation system to provide, measures the electrical quantitys such as the voltage of this AC signal, electric current, active power and reactive power.
The utility model electric energy meter calibration system adopts can be provided the satellite time transfer module of high accurate clock signal, has high linearity, the voltage-frequency modular converter of high stable characteristic and meet the alternating message source that " JJG 597-2005 AC electrical energy meter calibration vertification regulation " require, ensures that the utility model measuring results and electric energy meter calibration have high precision, credibility, reliability and tractability.The utility model electric energy meter field calibration system, meets the requirement of national AC electrical energy meter calibration vertification regulation.
The utility model electric energy meter calibration system can under any workplace and working environment, the field calibration work of Long-distance Control electric energy meter, makes this electric energy meter carry out examining and determine and calibrating without the need to regularly delivering to measuring examination and determination organization again.The problem that the utility model can also avoid traditional magnitude tracing and transmission of quantity value mode to bring, avoids the accumulation transmission of error in dipping.
Accompanying drawing explanation
Fig. 1 is the system principle diagram of a kind of electric energy meter field calibration system based on satellite navigation system of the utility model;
Fig. 2 is the theory diagram of voltage-frequency modular converter AD652 chip in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection domain of the present utility model is not limited to the following stated.
As shown in Figure 1, based on the electric energy meter field calibration system of satellite navigation system, it comprises electric energy meter voltage measurement loop, electric energy meter current measurement loop, and it also comprises voltage-frequency modular converter, processing module, satellite time transfer module, communication module and electric energy meter management main station system.
Single-phase/three-phase standard signal source produces to meet and lands the alternating message source of single-phase, phase three-wire three that state requires or three-phase four-wire system under the control of processing module, single-phase/three-phase standard signal source exports three road voltage AC signal and three road electric current AC signal, its voltage AC signal exported is connected with electric energy meter voltage measurement loop, electric energy meter current measurement loop respectively with electric current AC signal, and its voltage AC signal exported also is connected with voltage-frequency modular converter respectively with electric current AC signal.Electric energy meter voltage measurement loop, electric energy meter current measurement loop carry out electrical parameter metering to voltage AC signal and electric current AC signal respectively, and the electrical quantity result of metering is sent to processing module.
The input end of described voltage-frequency modular converter is connected with the output signal of single-phase/three-phase standard signal source, and one or more of voltage-frequency modular converter exports to input with one or more of processing module respectively and be connected.The three road voltage signals that single-phase/three-phase standard AC signal source exports by voltage-frequency modular converter, three road current signals convert the frequency signal be directly proportional to its amplitude to.
Described processing module is connected with electric energy meter to be calibrated by communication bus, processing module sends calibration command by communication bus to electric energy meter to be calibrated, and receiving the electrical quantity that electric energy meter to be calibrated sends, the electrical energy pulse input of processing module exports with the electrical energy pulse of electric energy meter to be calibrated and is connected.Processing module controls single-phase/three-phase standard signal source and produces alternating message source.The clock signal that processing module exports according to satellite time transfer module carries out timing sampling to the frequency signal that voltage-frequency modular converter exports, and the voltage signal exported single-phase/three-phase standard AC signal source according to sampled result, current signal carry out electrical parameter metering.The electrical quantity that processing module is measured and the electrical quantity that electric energy meter to be calibrated measures compare the error in dipping calculating this electric energy meter to be calibrated, and calibrate electric energy meter to be calibrated according to this error in dipping.
Described satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the output of satellite time transfer module is connected with the clock input of standard signal source, voltage-frequency modular converter and processing module respectively, for standard signal source, voltage-frequency modular converter and processing module provide clock reference.
Described processing module also manages main station system by communication module and electric energy meter and is connected.Processing module receives the orders such as the electric energy meter management startup of main station system, stopping or timing alignment by communication module, realize carrying out field calibration at electric energy meter management main website Long-distance Control the utility model to electric energy meter, and after calibration, the utility model passes calibration result data back electric energy meter management main station system by this communication module.
Electrical energy impulse signals is sent to processing module by electrical energy pulse port by electric energy meter to be calibrated, the pulse signal of electrical energy pulse to be width be 80ms ± 16ms.The time interval between two electrical energy pulses is exactly current accumulative electricity during this period of time.Such as: when the electric meter constant of an electric energy meter is that 3200 imp/kWh(3200 turn (pulse)/often spend electricity), so, there is a pulse, represent ammeter measured 1/3200 degree electric.When appearance 3200 electrical energy pulses, represent that ammeter has measured 1 degree of electricity.
Single-phase AC signal source, phase three-wire three alternating message source or three-phase and four-line alternating message source that described standard signal source requires for meeting " JJG 597-2005 AC electrical energy meter calibration vertification regulation ", standard signal source can produce ac voltage signal and ac current signal as required, and can carry out phase-splitting adjusting amplitude/phase place and close phase adjusting amplitude/phase place.
Described standard signal source can adopt the standard signal source in electric energy meter to be calibrated, also can independently arrange, to use when not meeting " JJG 597-2005 AC electrical energy meter calibration vertification regulation " required standard signal source in electric energy meter to be calibrated.
Described satellite time transfer module is made up of satellite time transfer treatment circuit and high steady constant temperature crystal circuit, according to the time difference between satellite time transfer time and high steady constant temperature crystal, adopt and tame algorithm, the clock accuracy of real-time adjustment high steady constant temperature crystal, ensures that the clock signal being supplied to single-phase/three-phase standard AC signal source, voltage-frequency modular converter and processing module remains tracing to the source of high precision and clock.Described satellite time transfer module comprises any one or multiple combination in gps satellite time service module, big-dipper satellite time service module, GLONASS satellite time transfer module and Galilean satellite time service module.
Described communication module comprises one or more the combination in wire communication module and wireless communication module.
Described wire communication module comprises one or more the combination in RJ45 communication module, RS232 communication module and RS485 communication module.Fiber optic telecommunications module can also be adopted.
Described wireless communication module comprises one or more the combination in gsm communication module, GPRS communication module and satellite communication module.Can also be 3G communication module, 4G communication module or WiFi communication module.
When adopting satellite communication module as wireless communication module of the present utility model, the satellite communication module having and gather satellite time transfer clock signal function can be adopted, to simplify circuit structure of the present utility model.
Described processing module is arm processor, can select STM32F108VET6 chip.
Described voltage-frequency modular converter is synchronizing voltage frequency converter SVFC, can adopt AD652 chip.The analog voltage of input or current signal can be converted to the pulse be in proportion or the square-wave signal of output frequency and this input signal by AD652 chip.
AD652 chip is a powerful accurate analog to digital conversion application build module, the maximum full scale frequency of this chip can reach 2MHz, and when output frequency is 100kHz, its nonlinearity erron representative value is 0.002%, when output frequency is 1MHz, its linearization error value reaches and is 0.005% to the maximum.
AD652 chip uses multiple conventional charge balance technique to perform translation function.It utilizes external clock to define Full-span output frequency, instead of depends on the stability of external capacitive.Therefore, its transport function is more stable, the linearity is higher, and this has very large benefit to single channel and multi-channel system.In its accurate low drifting reference voltage source and low-temperature coefficient sheet, film adjusting resistance makes gain drift minimum.In addition, initial gain error is down to less than 0.5% by laser wafer adjustment.
As shown in Figure 2, Fig. 2 is the theory diagram of AD652 chip, and the analog voltage of input or current signal are converted to the pulse be in proportion or the square-wave signal of output frequency and this input signal by AD652 chip.The conversion formula of output frequency signal F and input voltage signal Vin is as follows, and its derivation can see AD652 databook:
F＝(1/Ir*Rin*T
0)*Vin
In formula: in Ir-AD652 chip, constant current source is transferred to the charging current value of integrating capacitor;
The resistance of resistance Rin in Rin-AD652 chip;
T
0the cycle of-AD652 chip output frequency signal, the i.e. charge cycle of integrating capacitor.
The stability of electric current I r and resistance Rin only determines with the technique of AD652 chip.The impact of extraneous condition of work on electric current I r and resistance Rin is substantially negligible, and therefore electric current I r and resistance Rin can think constant.So output frequency F is directly proportional to the analog voltage Vin of input.Clock signal that the maximal value of AD652 chip output frequency F and stability are inputted by satellite time transfer module determines, substantially irrelevant with the precision of outer member, operating ambient temperature and humidity.
And cycle T
0by the clock control of AD652 chip, therefore the stability of external clock frequency and precision directly affects degree of stability and the linear error of output frequency signal.
The clock signal that satellite time transfer module inputs determines the scope of AD652 chip output frequency F, and the stability of the clock of AD652 chip also will affect the stability of output frequency F simultaneously.Owing to adopting the mode of satellite time transfer to provide clock signal, ensure that high stability and the high precision of AD652 chip clock input signal.Therefore AD652 chip can realize the voltage-frequency conversion of high linearity.The utility model electric energy meter calibration system adopts can be provided the satellite time transfer module of high accurate clock signal and have the voltage-frequency modular converter of high stable characteristic, makes the measurement result of electric energy meter calibration system have high precision.
The utility model based on the principle of work of the electric energy meter field calibration system of satellite navigation system is:
Satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, again according to the time difference between satellite time transfer clock signal and high stability crystal oscillator, adopt and tame the clock accuracy that algorithm adjusts crystal oscillator in real time, the clock signal providing high precision for current-frequency modular converter and processing module and can trace to the source;
Electric energy meter management main station system sends the orders such as startup, stopping or timing alignment by communication module to processing module, and processing module starts calibration, stops calibration or timing alignment after receiving this order;
After starting calibration, processing module control criterion signal source produces the AC voltage/current signal of phase three-wire three or the three-phase and four-line needed, and this AC voltage/current signal is exported to voltage-frequency modular converter and electric energy meter to be calibrated by standard signal source;
Voltage-frequency modular converter is according to satellite time transfer clock signal, and the AC voltage/current signal received converts the frequency signal be in proportion with this input signal to, and this frequency signal is sent to processing module;
Processing module carries out timing sampling according to satellite time transfer clock signal to this frequency signal, according to the pulse number gathered, the amplitude of the AC voltage/current signal that standard signal source exports can be obtained, and complete sampling and the calculating of voltage, electric current, active power and reactive power;
Electric energy meter to be calibrated calculates the electrical quantitys such as the active power of AC voltage/current signal, reactive power and the power factor (PF) that standard signal source exports according to the computation chip of inside, and by communication bus and electrical energy pulse port, this electrical quantity is sent to processing module;
The electrical quantity that electric energy meter to be calibrated calculates by processing module and the electrical quantity himself calculated compare calculating, obtain the error in dipping of current electric energy meter to be calibrated, and according to the error of this error data correction electric energy meter computation chip, complete the calibration to electric energy meter to be calibrated;
Calibration object information is returned to electric energy meter management main station system by communication module by processing module.
The utility model calibration system adopts the voltage-frequency modular converter of high linearity, high stability, convert the standard signal that signal source inputs to be directly proportional to this standard signal size frequency signal, then by processing module, timing sampling is carried out to this frequency signal, obtain the amplitude size of input current, voltage signal with this.
Key point of the present utility model is: 1. realize host computer Long-distance Control electric energy meter and carry out field calibration work; 2. adopt the voltage-frequency modular converter of high linearity, high stability to carry out signal conversion; 3. satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, for standard signal source, voltage-frequency modular converter and processing module provide clock reference, ensure the high precision of processing module measurement result and electric energy meter calibration, credibility, reliability and tractability.
Claims (6)
1. based on the electric energy meter field calibration system of satellite navigation system, it comprises electric energy meter voltage measurement loop, electric energy meter current measurement loop, it is characterized in that: it also comprises voltage-frequency modular converter, processing module, satellite time transfer module, communication module and electric energy meter management main station system;
Single-phase/three-phase standard signal source produces to meet and lands the alternating message source of single-phase, phase three-wire three that state requires or three-phase four-wire system, single-phase/three-phase standard signal source exports three road voltage AC signal and three road electric current AC signal, its voltage AC signal exported is connected with electric energy meter voltage measurement loop, electric energy meter current measurement loop respectively with electric current AC signal, and its voltage AC signal exported also is connected with voltage-frequency modular converter respectively with electric current AC signal;
The input end of described voltage-frequency modular converter is connected with the output signal of single-phase/three-phase standard signal source, and the output of voltage-frequency modular converter is connected with processing module;
Described processing module is connected with electric energy meter to be calibrated by communication bus, and the calibration command of processing module and the acquisition of electrical quantity are all undertaken alternately by communication bus, and the electrical energy pulse input of processing module exports with the electrical energy pulse of electric energy meter to be calibrated and is connected;
Described satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the output of satellite time transfer module is connected with the clock input of standard signal source, voltage-frequency modular converter and processing module respectively, for standard signal source, voltage-frequency modular converter and processing module provide clock reference;
Described processing module also manages main station system by communication module and electric energy meter and is connected.
2. the electric energy meter field calibration system based on satellite navigation system according to claim 1, is characterized in that: described satellite time transfer module comprises satellite time transfer treatment circuit and high steady constant temperature crystal circuit.
3. the electric energy meter field calibration system based on satellite navigation system according to claim 1, is characterized in that: described satellite time transfer module comprises any one or multiple combination in gps satellite time service module, big-dipper satellite time service module, GLONASS satellite time transfer module and Galilean satellite time service module.
4. the electric energy meter field calibration system based on satellite navigation system according to claim 1, is characterized in that: described communication module comprises one or more the combination in wire communication module and wireless communication module.
5. the electric energy meter field calibration system based on satellite navigation system according to claim 4, is characterized in that: described wire communication module comprises one or more the combination in RJ45 communication module, RS232 communication module and RS485 communication module.
6. the electric energy meter field calibration system based on satellite navigation system according to claim 5, is characterized in that: described wireless communication module comprises one or more the combination in gsm communication module, GPRS communication module and satellite communication module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066465A (en) * | 2016-07-07 | 2016-11-02 | 国网江苏省电力公司宿迁供电公司 | A kind of Watt-hour meter's field test remote impulse module and method of calibration thereof |
| CN117031377B (en) * | 2023-08-10 | 2024-05-14 | 河北大学 | Automatic calibration system and method for Hall type current sensor |
-
2014
- 2014-11-12 CN CN201420672460.4U patent/CN204166121U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066465A (en) * | 2016-07-07 | 2016-11-02 | 国网江苏省电力公司宿迁供电公司 | A kind of Watt-hour meter's field test remote impulse module and method of calibration thereof |
| CN117031377B (en) * | 2023-08-10 | 2024-05-14 | 河北大学 | Automatic calibration system and method for Hall type current sensor |
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Granted publication date: 20150218 Termination date: 20201112 |