WO2012159400A1 - Online check meter of high-voltage electric energy metering device - Google Patents

Online check meter of high-voltage electric energy metering device Download PDF

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Publication number
WO2012159400A1
WO2012159400A1 PCT/CN2011/080217 CN2011080217W WO2012159400A1 WO 2012159400 A1 WO2012159400 A1 WO 2012159400A1 CN 2011080217 W CN2011080217 W CN 2011080217W WO 2012159400 A1 WO2012159400 A1 WO 2012159400A1
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WO
WIPO (PCT)
Prior art keywords
electric energy
voltage
energy metering
microprocessor
unit
Prior art date
Application number
PCT/CN2011/080217
Other languages
French (fr)
Chinese (zh)
Inventor
冯凌
侯兴哲
胡晓锐
肖冀
魏麟
周华勇
张喜
Original Assignee
重庆市电力公司电力科学研究院
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Priority to CN 201110138849 priority Critical patent/CN102162842B/en
Priority to CN201110138849.1 priority
Application filed by 重庆市电力公司电力科学研究院 filed Critical 重庆市电力公司电力科学研究院
Publication of WO2012159400A1 publication Critical patent/WO2012159400A1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/04Testing or calibrating of apparatus covered by the preceding groups of instruments for measuring time integral of power or current

Abstract

Disclosed is an online check meter of a high-voltage electric energy metering device, comprising: an acquisition processing unit (1) arranged at a high-voltage side and used for acquiring electricity parameter information on a high-voltage line and converting the electricity parameter information into a digital signal; an electric energy metering unit (2) arranged at a low-voltage side, connected with the acquisition processing unit (1) and used for receiving the digital signal corresponding to the electricity parameter information and calculating the electric energy standard value of the current loop; and a microprocessor (3) arranged at the low-voltage side, connected with the electric energy metering unit (2) and connected with an electric energy pulse signal input interface (4). The microprocessor (3) receives the electric energy pulse signal, measured by the tested high-voltage electric energy metering device, of the current loop via the electric energy pulse signal input interface (4), and the electric energy standard value provided by the electric energy metering unit (2), and calculates the overall error of the tested high-voltage electric energy metering device, so that the overall error of the high-voltage electric energy metering device is checked accurately under the condition that the power supply is uninterrupted.

Description

 High-voltage electric energy metering device online calibrator This application claims to be submitted to the Chinese Patent Office, application number 201110138849.1 on May 25, 2011, and the priority of the Chinese patent application entitled "High-voltage electric energy metering device online calibrator", all of which The content is incorporated herein by reference. TECHNICAL FIELD The present application relates to the field of power metering device calibration technology, and more particularly to a high voltage energy metering device online calibrator.

Background technique

 The electric energy metering device is used for collecting and recording the electric parameter data used by the user, thereby obtaining the electric energy parameter of the user for a period of time, and the accuracy of the electric energy metering device directly affects the interests of both the power supply and the power supply. Therefore, periodic on-site verification of the energy metering device is required to ensure the accuracy of the energy metering device.

 At present, the existing online calibrator for high-voltage electric energy metering devices generally adopts a sub-testing method, that is, respectively calibrates the electric energy meter error and the transformer error inside the high-voltage electric energy metering device, and measures the voltage drop of the secondary circuit of the transformer. After each sub-item error meets the corresponding error limit requirements, the whole set of electric energy metering devices is considered qualified. However, each sub-item error only reflects the metering performance of a single metering component and does not reflect the overall metering error of the entire energy metering device. Therefore, a comprehensive error assessment must be performed for each sub-metering error.

 The so-called integrated error refers to the synthetic error of the current transformer and the voltage transformer, the voltage drop of the voltage transformer secondary loop voltage drop and the algebraic sum of the metering error of the energy meter. Since the actual grid voltage and power load are only approximately three-phase symmetry, and the actual operating error of the current transformer and voltage transformer and the voltage drop of the secondary circuit of the voltage transformer are not fixed values, the integrated error cannot be used as an evaluation of the error of the entire energy metering device. The basis for this is only applicable to the analysis of the source of the error. In other words, no matter the sub-item verification method and the comprehensive error evaluation, the overall error of the high-voltage energy metering device cannot be scientifically and reasonably evaluated. In particular, the error verification of the transformer must be performed in the power-off state, which greatly interferes with the normal power consumption of the user.

In addition, with the rapid development of electric energy metering technology, the integration of high-voltage energy metering devices is coming The higher the difference, the inability to distinguish between the transformer and the energy meter, and the verification of this high-voltage energy metering device cannot be performed using the itemized verification method.

Summary of the invention

 In order to solve the above technical problem, the embodiment of the present application provides an online calibrator for a high-voltage electric energy metering device, so as to accurately verify the overall error of the high-voltage electric energy metering device under the condition of no power failure, and the technical scheme is as follows:

 An online calibrator for a high-voltage electric energy metering device, comprising:

 An acquisition processing unit disposed on the high voltage side for collecting electrical parameter information on the high voltage line, and converting the electrical parameter information into a digital signal;

 An electric energy metering unit disposed on the low voltage side and connected to the collection processing unit receives the digital signal corresponding to the electrical parameter information, and calculates a power standard value of the current loop;

 a microprocessor disposed on the low voltage side and connected to the electric energy metering unit, the microprocessor being connected with a power pulse input interface for measuring according to the measured high voltage electric energy metering device sent by the received energy pulse input interface The electric energy pulse signal of the current loop and the electric energy standard value provided by the electric energy metering unit calculate the overall error of the measured high-voltage electric energy metering device;

 A main control unit connected to the microprocessor is configured to control an operating state of the microprocessor. Preferably, the above-mentioned high-voltage electric energy metering device online calibrator further comprises: a display unit connected to the microprocessor for displaying the overall error of the measured high-voltage electric energy metering device calculated by the microprocessor.

 Preferably, the collection processing unit includes:

 a sensor module for collecting voltage values and current values in a current loop;

 a sample and hold module connected to the sensor module;

 An analog/digital conversion module connected to the sample and hold module converts the collected voltage value and current value into digital signals respectively;

 And an optical transmission module connected to the analog/digital conversion module, configured to convert the voltage and current digital signals into optical signals;

 a power module connected to the sample and hold module, the analog/digital conversion module, and the optical transmission module.

Preferably, the main control unit includes: a control unit for controlling an operating state of the microprocessor, And a calibration unit for adjusting the self-measurement error of the online calibrator of the high-voltage energy metering device. Preferably, the sensor module comprises: a current sensor and a voltage sensor.

 Preferably, the electric energy metering unit is a digital signal processing DSP microprocessor.

 Preferably, the microprocessor and the main control unit form a single chip microcomputer.

 Preferably, the display unit is a liquid crystal display.

 It can be seen from the technical solution provided by the above embodiments of the present application that the collection processing unit can directly measure the electrical parameter information of the high-voltage side of the current line, for example, voltage information and current information, and convert the electrical parameter information into a digital signal for providing energy measurement. The unit calculates the power standard value of the current loop and provides the power to the microprocessor, and the microprocessor calculates the measured high-voltage power according to the current circuit power standard value and the obtained current energy of the measured high-voltage energy metering device. The overall error of the metering device, the main control unit, is used for controlling the working state of the microprocessor. The high-voltage energy metering device online calibrator realizes the accurate verification of the overall error of the high-voltage energy metering device under the condition of no power failure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of an on-line calibrator of a high-voltage electric energy metering device according to an embodiment of the present invention; FIG. 2 is a schematic structural view of an acquisition processing unit according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present application provides an online calibrator for a high-voltage electric energy metering device, which measures the electric parameter information of the current line through the collection processing unit disposed on the high-voltage side, and then calculates the electric energy standard of the current loop by the electric energy measuring unit. The value is compared with the current circuit energy measurement value measured by the measured high-voltage energy metering device to obtain the overall error of the measured high-voltage energy metering device, thereby realizing accurate verification of the energy metering under the condition of no power failure. The overall error of the device.

 The above objects, features and advantages of the present application will become more apparent and understood.

 Referring to FIG. 1 , a schematic structural diagram of an on-line calibrator for a high-voltage electric energy metering device according to an embodiment of the present application is shown. The calibrator mainly includes: an acquisition processing unit 1, an electric energy measuring unit 2, a microprocessor 3, and a main control Unit 5, where:

The acquisition processing unit 1 is disposed on the high voltage side of the line for collecting electrical parameter information on the high voltage line where the measured high voltage electric energy metering device is located, and converting the electrical parameter information into a digital signal, and providing The energy metering unit 2 is supplied.

 The collection processing unit can directly sample the electrical parameter information on the high voltage line where the measured high voltage electric energy metering device is located, that is, the electric parameter information of the current loop, and obtain a digital signal after analog-to-digital conversion, and obtain digital light after electro-optic conversion. The signal, the electrical parameter information mainly includes voltage information and current information of the current loop.

 The electric energy metering unit 2 is disposed on the low-voltage line where the high-voltage electric energy metering device is measured, and is connected to the collecting and processing unit 1 for receiving the digital optical signal of the electric parameter information conveyed by the processing unit 1, and calculating the current loop Standard value of electrical energy.

 Specifically, the energy metering unit can be implemented by a DSP (Digital Signal Processing) microprocessor, and firstly, the digital light signal of the received electrical parameter information of the current loop is restored to a digital electrical signal by photoelectric conversion, that is, the current The voltage information and current information of the loop are then calculated to obtain electrical parameter information of the current loop, such as the electrical power transmitted on the line.

 The microprocessor 3 is disposed on the low voltage line where the high voltage electric energy metering device under test is located, is connected to the electric energy metering unit 2, and is connected to the electric energy pulse input interface 4.

 The main control unit 5 is connected to the microprocessor 3 for controlling the working state of the microprocessor 3. The microprocessor 3 receives the electric energy standard value of the current loop delivered by the electric energy metering unit 2, and receives the electric energy pulse signal measured by the measured high-voltage electric energy metering device through the electric energy pulse signal input interface 4, and converts the electric energy pulse signal The energy measurement value of the current loop, that is, the energy value of the current loop measured by the measured high-voltage energy metering device. Then, based on the received power standard value of the current loop and the energy measurement value of the current loop, the microprocessor can calculate the overall error of the measured high piezoelectric energy metering device according to the following formula (1).

 r =(R-E ) /Exl00% ( 1 )

 Where r is the overall error of the high-voltage energy metering device under test, R is the measured electrical energy of the high-voltage energy metering device under test, and E is the measured electrical energy of the line calibrator of the high-voltage energy metering device.

In a specific implementation, the microprocessor 3 and the main control unit 5 form a single-chip microcomputer, and the microprocessor 3 is preferably a single-chip microcomputer. The main control unit 5 includes: a control unit 51 and a calibration unit 52, wherein: the control unit 51 For adjusting the working state of the microprocessor 3, the adjusting unit 52 is configured to adjust the measurement error of the online calibrator of the high-voltage energy metering device, and improve the high-voltage energy metering The verification accuracy of the device online calibrator.

 The calibrator of the high-voltage electric energy metering device provided by the embodiment is equivalent to the standard electric energy metering device, directly measuring the electric parameter information on the high-voltage line where the measured high-voltage electric energy metering device is located, and calculating the electric energy standard value on the line, and The measured electric energy measurement values measured by the high-voltage electric energy metering device are compared, and the overall error of the measured high-voltage electric energy measuring device is obtained, so that the high-voltage electric energy measuring device can be accurately verified under the condition of no power failure. Preferably, referring to FIG. 1, the high-voltage electric energy metering device online calibrator further includes: a display unit 6 connected to the microprocessor on the low-voltage side of the line where the high-voltage electric energy metering device is tested, for displaying the microprocessor 3 Calculate the overall error of the measured high-voltage energy metering device.

 Specifically, the display unit 6 can display the calculated overall error of the measured high-voltage electric energy metering device in real time, and the display unit can be realized by a liquid crystal display.

 The electric energy metering unit, the micro-processor and the display unit in the online calibrator of the high-voltage electric energy metering device provided in this embodiment are all disposed on the low-voltage side. Therefore, when the calibrator is used, the personal safety of the worker is not endangered. 2 is a schematic structural diagram of an acquisition processing unit according to an embodiment of the present application. The collection processing unit includes: a sensor module 11, a sample and hold module 12, an analog/digital conversion module 13, a light transmission module 14, and a power supply. Module 15, where:

 The sensor module 11 is configured to sample voltage information and current information on the high voltage line where the high voltage energy metering device is measured, and ensure the synchronization of the sampling through the sample and hold module 12.

 Specifically, the sensor module includes a current sensor and a voltage sensor, respectively, for sampling electrical parameter information such as current amplitude and voltage amplitude at each moment on the high voltage line.

 The current sensor can be implemented by a clamp ammeter, a micropower feedthrough current transformer or a hollow coil; the voltage sensor can be implemented by a capacitor, a resistor divider, or a magneto-optical effect optical sensor.

 The sensor module can adopt a three-phase integral type or a single-phase split type structure, and adopts a material with sufficient dielectric strength to directly connect or socket directly on the high-voltage line where the high-voltage electric energy measuring device to be tested is located without power failure.

An analog/digital conversion module 13 is configured to convert the sampled electrical parameter information of the current loop into a digital Signal.

 The optical transmission module 14 is connected to the analog/digital conversion module, and the digital signal for receiving the electrical parameter information of the current loop is converted into a digital optical signal and transmitted to the energy metering unit 2 through the optical fiber.

 In a specific implementation, the optical transmission module can be implemented by an optical sensor.

 The power module 15 provides power for the passive modules in the collection processing unit, which can be realized by current or voltage source. The power module can specifically supply power to the sample and hold module 12, the analog/digital conversion module 13, and the optical transmission module 14.

 It should be noted that the pulse constant of the online calibrator of the high-voltage electric energy metering device in the present specification can be set according to the pulse constant of the high-voltage electric energy measuring device to be tested, and the current and voltage transformer of the measured high-voltage electric energy metering device should be considered during the setting. Magnification. For example: When the pulse constant of the measured high-voltage energy metering device is 3200imp/kWh, the current transformer ratio is 50A/5A, that is, the magnification is 10, and the voltage transformer ratio is 10kV/100V, that is, the magnification is 100, due to the measured The high-voltage electric energy metering device measures the secondary electric energy, and the high-voltage electric energy measuring device measures the primary electric energy by the online calibrator. The pulse constant set by the calibrator is the pulse constant of the measured high-voltage electric energy measuring device divided by the current and the voltage. The transformer's multiplier, ie 3.2imp/kWh, ensures that the current loop's electrical energy measured by the measured high-voltage energy metering device is correctly compared to the standard electrical energy measured by the calibrator.

 The online calibrator of the high-voltage electric energy metering device provided by the embodiment of the present application can perform online verification on the 6kV-35 kV electric energy metering device operating in the field, and can display the real-time error of the verification through the display unit.

 The various embodiments in the present specification are described in a progressive manner, and the same parts of the various embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. The embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, ie may be located in one Places, or they can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

 The above description is only a specific embodiment of the present application, and it should be noted that those skilled in the art can also make some improvements and retouching without departing from the principle of the present application. It should be considered as the scope of protection of this application.

Claims

Rights request
 1. An online calibrator for a high-voltage electric energy metering device, comprising:
 An acquisition processing unit disposed on the high voltage side for collecting electrical parameter information on the high voltage line, and converting the electrical parameter information into a digital signal;
 An electric energy metering unit disposed on the low voltage side and connected to the collection processing unit receives the digital signal corresponding to the electrical parameter information, and calculates a power standard value of the current loop;
 a microprocessor disposed on the low voltage side and connected to the electric energy metering unit, the microprocessor being connected with a power pulse input interface for measuring according to the measured high voltage electric energy metering device sent by the received energy pulse input interface The electric energy pulse signal of the current loop and the electric energy standard value provided by the electric energy metering unit calculate the overall error of the measured high-voltage electric energy metering device;
 A main control unit connected to the microprocessor is configured to control an operating state of the microprocessor.
The on-line calibrator for a high-voltage electric energy metering device according to claim 1, further comprising: a display unit connected to the microprocessor, configured to display the measured high voltage calculated by the microprocessor The overall error of the energy metering device.
 The on-line calibrator for a high-voltage electric energy metering device according to claim 1 or 2, wherein the acquisition processing unit comprises:
 a sensor module for collecting voltage values and current values in a current loop;
 a sample and hold module connected to the sensor module;
 An analog/digital conversion module connected to the sample and hold module converts the collected voltage value and current value into digital signals respectively;
 And an optical transmission module connected to the analog/digital conversion module, configured to convert the voltage and current digital signals into optical signals;
 a power module connected to the sample and hold module, the analog/digital conversion module, and the optical transmission module.
 The on-line calibrator for a high-voltage electric energy metering device according to claim 3, wherein the main control unit comprises:
 A control unit for controlling the operating state of the microprocessor, and a calibration unit for adjusting the self-measurement error of the on-line calibrator of the high-voltage energy metering device.
5. The high-voltage electric energy metering device online calibrator according to claim 4, wherein The sensor module includes: a current sensor and a voltage sensor.
 The on-line calibrator for high-voltage electric energy metering device according to claim 5, wherein the electric energy measuring unit is a digital signal processing DSP microprocessor.
 The on-line calibrator for high-voltage electric energy metering device according to claim 6, wherein the microprocessor and the main control unit constitute a single chip microcomputer.
 The on-line calibrator for a high-voltage electric energy metering device according to claim 2, wherein the display unit is a liquid crystal display.
PCT/CN2011/080217 2011-05-25 2011-09-27 Online check meter of high-voltage electric energy metering device WO2012159400A1 (en)

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