CN204789976U - Automatic calibration equipment of electric energy meter error - Google Patents

Abstract

An automatic error calibration device for electric energy meters is used to measure the error of the electric energy meter under test. The device includes a load module, a microprocessor acquisition and measurement module, and a test terminal installed with test software. The meter, the microprocessor acquisition and measurement module is connected to the test terminal, and it is characterized in that it also includes an optical fiber for collecting and transmitting the optical pulse signal of the electric energy meter under test, and a photoelectric conversion module for converting the optical pulse signal into an electrical pulse signal , The signal line used to transmit the electric pulse signal, one end of the optical fiber is connected to the input end of the photoelectric conversion module, the other end of the optical fiber is in contact with the light pulse signal indicator light of the electric energy meter under test, and the output end of the photoelectric conversion module is connected through the signal line To the microprocessor acquisition measurement module. The optical fiber has strong anti-electromagnetic interference ability, and can isolate the electromagnetic disturbance applied to the tested electric energy meter, ensuring the normal operation of the electric energy meter error automatic calibration device in the electric energy meter's electromagnetic compatibility test.

Description

Electric energy meter error automatic calibration device

technical field

The utility model relates to the technical field of electric energy meter detection, in particular to an electric energy meter error automatic calibration device with the function of electromagnetic disturbance protection.

Background technique

The energy meter error calibration device usually includes a standard source for providing rated working voltage and rated working current to the tested electric energy meter, a standard meter for measuring the output power of the standard source, and a standard meter for collecting the optical pulse generated by the tested electric energy meter. A signal collector, and a device for calculating the error of the tested electric energy meter according to the number of light pulses collected. Since most of the electric energy meter inspection devices on the market do not consider the electromagnetic compatibility of the device itself, the immunity of the device is very poor. In the electromagnetic compatibility test of electric energy meters, the use of such inspection devices often cannot be carried out normally and affects the error calibration of electric energy meters. result.

In order to ensure the normal operation of the energy meter error calibration device in the EMC test of the energy meter, it is usually necessary to insert a decoupling network between the tested energy meter and the energy meter error calibration device. Due to the large difference in various electromagnetic interference signals, interference The frequency spectrum is very wide, and there are certain differences in the requirements for the decoupling network. The devices capable of decoupling various electromagnetic disturbance signals at the same time are either few or very complicated, which leads to the complexity of the test operation and high equipment costs, and also affects The accuracy of the error calibration of the electric energy meter. In addition, as an alternative method recommended by some watt-hour meter product standards, some organizations and manufacturers use manual counting and reading of the number of light pulses emitted by the watt-hour meter when electromagnetic disturbance is applied and when no electromagnetic disturbance is applied, and calculate the accuracy of the watt-hour meter accordingly. This method has the disadvantages of time-consuming, easy to introduce human error, and can only interpret the average error.

Utility model content

The technical problem to be solved by the utility model is to provide an automatic error checking device for electric energy meters with the function of electromagnetic disturbance protection in view of the above-mentioned defects of poor anti-electromagnetic disturbance function in the prior art.

The technical solution adopted by the utility model to solve the technical problem is: to construct a kind of electric energy meter error automatic calibration device, which is used to measure the error of the tested electric energy meter. The device includes a load module, a microprocessor acquisition and measurement module and A test terminal equipped with test software, the load module is connected to the tested watt-hour meter, the microprocessor acquisition and measurement module is connected to the test terminal, and also includes an optical pulse signal for collecting and transmitting the tested watt-hour meter An optical fiber, a photoelectric conversion module for converting the optical pulse signal into an electrical pulse signal, and a signal line for transmitting the electrical pulse signal, one end of the optical fiber is connected to the input end of the photoelectric conversion module, the The other end of the optical fiber is in contact with the light pulse signal indicator light of the electric energy meter under test, and the output end of the photoelectric conversion module is connected to the microprocessor acquisition and measurement module through the signal line.

In the electric energy meter error automatic calibration device described in the utility model, the microprocessor acquisition and measurement module includes an electric pulse acquisition module for real-time acquisition of electric pulse signals, an electric pulse cycle measurement module for measuring the electric pulse signal cycle, and a test The terminal establishes a data transmission module for real-time communication to transmit measurement data.

In the electric energy meter error automatic calibration device described in the utility model, the load module includes an active load, a switch for connecting with the tested electric energy meter, and a reactive load, and the switch is respectively connected to the active load , Reactive load, so that the tested electric energy meter works in active mode and reactive mode respectively, and then measures the active error and reactive error of the tested electric energy meter respectively.

In the electric energy meter error automatic calibration device described in the utility model, the microprocessor acquisition and measurement module is connected to the test terminal through a USB data line.

In the electric energy meter error automatic calibration device described in the utility model, the load module is connected to the tested electric energy meter through a power line.

Implementing the electric energy meter error automatic calibration device of the present utility model has the following beneficial effects: in the present utility model, the optical pulse signal of the electric energy meter under test is collected and transmitted by using an optical fiber, and the optical pulse signal is converted into a suitable micro The processor collects the electric pulse signal identified by the measurement module. Due to the strong anti-electromagnetic interference ability of the optical fiber, it is not affected by electromagnetic disturbance, and can isolate the electromagnetic disturbance applied to the electric energy meter under test, ensuring the electromagnetic compatibility test of the electric energy meter. The normal operation of the energy meter error automatic calibration device.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a structural schematic diagram of the utility model electric energy meter error automatic calibration device.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is described in detail with reference to the accompanying drawings.

Referring to Fig. 1, it is a structural schematic diagram of the utility model electric energy meter error automatic calibration device.

The electric energy meter error automatic calibration device of the present utility model is used for measuring the error of the tested electric energy meter 2, and the device includes a load module 1 connected to the tested electric energy meter 2, a photoelectric conversion module 3, and a microprocessor Acquisition and measurement module 4 and a test terminal 5 with test software installed, wherein, the load module 1 and the photoelectric conversion module 3 are respectively connected to the electric energy meter 2 under test, the photoelectric conversion module 3, the microprocessor acquisition and measurement module 4, and the test terminal 5 are sequentially connect.

Wherein, one end of the optical fiber 200 is connected to the input end of the photoelectric conversion module 3, the other end of the optical fiber 200 is in contact with the light pulse signal indicator light of the electric energy meter 2 under test, and the output end of the photoelectric conversion module 3 Connect to the microprocessor acquisition and measurement module 4 through the signal line 300 .

The optical fiber 200 is used to collect and transmit the optical pulse signal output by the optical pulse signal indicator light on the tested electric energy meter 2, and the process of transmitting the optical pulse signal by the optical fiber 200 is not affected by electromagnetic disturbances, and can be applied to the tested electric energy meter 2 The electromagnetic disturbance is isolated, so that the photoelectric conversion module 3 and the microprocessor acquisition and measurement module 4 connected to it are not disturbed by the electromagnetic disturbance, so that they can work normally and accurately measure the error of the electric energy meter.

The photoelectric conversion module 3 is used to convert the optical pulse signal into an electrical pulse signal suitable for receiving and processing by the microprocessor acquisition and measurement module 4 , and the signal line 300 transmits the electrical pulse signal to the microprocessor acquisition and measurement module 4 . The photoelectric conversion module 3 can be a photoelectric converter on the market. The specific model is not limited, as long as the conversion of optical pulse signal and electric pulse signal can be realized, it is within the protection scope of the utility model.

The microprocessor acquisition and measurement module 4 is connected with the test terminal 5 through the USB data line 400, and the microprocessor acquisition and measurement module 4 obtains the cycle of the electric pulse signal based on the electric pulse signal transmitted in the signal line 300, and passes the relevant data through the USB The data line 400 is transmitted to the test terminal 5, and the test terminal 5 uses test software to perform calculations to obtain the error of the tested electric energy meter 2 and save the transmitted measurement data and calculated error data. Specifically: the microprocessor acquisition and measurement module 4 includes: an electrical pulse acquisition module 41 , an electrical pulse period measurement module 42 , and a data transmission module 43 . Among them, the electric pulse collection module 41 collects electric pulse signals in real time, the electric pulse cycle measurement module 42 measures the electric pulse signal cycle, and the data transmission module 43 establishes real-time communication with the test terminal 5 to transmit measurement data.

In the prior art, the standard source needs to provide the rated voltage and rated current to the tested electric energy meter and measure the output power of the standard source through the standard meter, and calculate the error of the electric energy meter by collecting and calculating the number of light pulses emitted by the tested electric energy meter. Its poor electromagnetic disturbance protection ability makes it unable to work normally in the electromagnetic compatibility test and thus cannot correctly measure the error of the tested electric energy meter. However, in the present utility model, the optical fiber 200 is used to guide the light pulse into the photoelectric conversion module 3, the electric pulse acquisition measurement module 4 and the measurement terminal 5 are not electrically connected to the tested electric energy meter 2 applied with electromagnetic disturbance, and the constant load module 1 adopts no electrical connection The source device will not be disturbed by electromagnetic disturbance signals.

The principle that the measurement terminal 5 calculates the electric energy meter error according to the electrical pulse signal cycle measurement value obtained by the microprocessor acquisition measurement module 4 is as follows: under constant load conditions, the frequency of the optical pulse signal sent by the electric energy meter is a constant value, and When the optical pulse signal is converted into an electrical pulse signal by the photoelectric conversion module, the period of the electrical pulse signal is also a constant value. According to the watt-second method principle of the error measurement of the electric energy meter, after the constant load value is set, the electric pulse signal period at this time (that is, the calculation period) can be calculated, and the difference between the actual measured electric pulse signal period and the calculation period can be calculated. Divide by the calculation period and multiply by 100, which is the percentage error of the energy meter. In actual measurement, the average value of the first 30 or 100 electric pulse signal period values without electromagnetic disturbance can also be used to replace the calculated pulse period value after the constant load is stabilized, which also has high accuracy.

The load module 1 is connected to the electric energy meter 2 under test through a power line 100 . Preferably, the load module 1 includes an active load 11, a switch 12 for connecting with the tested electric energy meter 2, and a reactive load 13, and the switch 12 is respectively connected to the active load 11 and the reactive load 13, Select the active load 11 or the reactive load 13 to be connected to the tested electric energy meter 2 by switching the switch 12, so that the tested electric energy meter 2 works in the active mode or the reactive mode respectively, so that the error automatic calibration device of the electric energy meter can be measured respectively The active error and reactive error of the tested electric energy meter 2.

In the electric energy meter electromagnetic compatibility test, the load module 1 and the optical fiber 200 of the electric energy meter error automatic calibration device of the present utility model are respectively connected to the tested electric energy meter 2, and the photoelectric conversion module 3 and the microprocessor acquisition and measurement module 4 are started successively 1. Install the test terminal 5 (such as a computer) with test software, start the load module 1 to preheat for 5 to 10 minutes, and after the load module 1 stabilizes, open the test software of the test terminal 5 to start testing.

When the tested electric energy meter 2 starts to work according to the mode (constant active mode or constant reactive power mode) set by the load module 1, the tested electric energy meter 2 will continuously indicate through its own electric energy pulse according to its own working principle The light emits a light pulse signal, and the optical fiber 200 connected to the electric energy pulse indicator light transmits the collected light pulse signal to the photoelectric conversion module 3, and converts it into an electric pulse signal that the microprocessor acquisition and measurement module 4 can receive. Acquisition module 41, electric pulse cycle measurement module 42 work respectively and electric pulse signal cycle measurement data is transmitted to the test terminal 5 that test software is installed in real time by data transmission module 43, USB data line, and test software then utilizes to receive electric pulse cycle The data calculates the error of the tested electric energy meter 2, and automatically saves the electric pulse cycle data and the calculated electric energy meter error data.

In summary, the implementation of the utility model of the electric energy meter error automatic calibration device has the following beneficial effects: in the present utility model, the optical pulse signal of the tested electric energy meter is collected and transmitted by using an optical fiber, and the optical pulse signal is combined with the photoelectric conversion module. The signal is converted into an electric pulse signal suitable for the identification of the microprocessor acquisition and measurement module. Due to the strong anti-electromagnetic interference ability of the optical fiber, it is not affected by electromagnetic disturbance, and can isolate the electromagnetic disturbance applied to the tested electric energy meter, ensuring that the electric energy meter The normal operation of the automatic calibration device for the error of the electric energy meter in the electromagnetic compatibility test.

Embodiments of the present utility model have been described above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative, rather than restrictive. Under the enlightenment of the utility model, personnel can also make many forms without departing from the scope of protection of the purpose of the utility model and claims, and these all belong to the protection of the utility model.

Claims (5)

1. A kind of electric energy meter error automatic calibration device, is used for measuring the error of tested electric energy meter (2), and this device comprises load module (1), microprocessor acquisition measuring module (4) and testing software are installed The test terminal (5), the load module (1) is connected to the tested electric energy meter (2), and the microprocessor acquisition measurement module (4) is connected to the test terminal (5), it is characterized in that, Comprising an optical fiber (200) for collecting and transmitting an optical pulse signal of the tested electric energy meter (2), a photoelectric conversion module (3) for converting the optical pulse signal into an electrical pulse signal, and a photoelectric conversion module (3) for transmitting the electrical pulse signal The signal line (300) of the pulse signal, one end of the optical fiber (200) is connected to the input end of the photoelectric conversion module (3), and the other end of the optical fiber (200) is connected to the light of the tested electric energy meter (2). The pulse signal indicator light is in contact, and the output end of the photoelectric conversion module (3) is connected to the microprocessor acquisition and measurement module (4) through the signal line (300). 2. the electric energy meter error automatic calibration device according to claim 1, is characterized in that, described microprocessor acquisition measurement module (4) comprises the electrical pulse acquisition module (41) of real-time acquisition electrical pulse signal, measurement electrical pulse An electrical pulse period measurement module (42) for signal period, and a data transmission module (43) for establishing real-time communication with the test terminal (5) to transmit measurement data. 3. the electric energy meter error automatic calibration device according to claim 1, is characterized in that, described load module (1) comprises active load (11), is used for being connected with the changeover switch (2) of tested electric energy meter (2) 12), reactive load (13), described switching switch (12) connects described active load (11), reactive load (13) respectively, so that tested electric energy meter (2) works in active mode, reactive mode respectively In the power mode, the active error and reactive error of the tested electric energy meter (2) are respectively measured. 4. The electric energy meter error automatic calibration device according to claim 1, characterized in that the microprocessor acquisition and measurement module (4) is connected to the test terminal (5) through a USB data line (400). 5. The device for automatically checking errors of electric energy meters according to claim 1, characterized in that, the load module (1) is connected to the tested electric energy meter (2) through a power line (100).