Auto calibration method for single-phase electronic type electric energy meter

An electric energy meter and electronic technology, which is applied in the field of automatic calibration of single-phase electronic electric energy meters, can solve the problems of high labor intensity and slow adjustment speed, and achieve the effects of reducing labor intensity, accurate calibration, and reducing hardware costs

Active Publication Date: 2009-02-04
JIANGSU KAOU WANHONG ELECTRON
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Problems solved by technology

Therefore, the adjustment speed is slow, the labor intensity is high

Method used

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  • Auto calibration method for single-phase electronic type electric energy meter
  • Auto calibration method for single-phase electronic type electric energy meter
  • Auto calibration method for single-phase electronic type electric energy meter

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Embodiment Construction

[0025] The present invention will be further explained below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the hardware platform for the operation of the automatic meter calibration method of a single-phase electronic electric energy meter according to the present invention includes a single-chip microcomputer 1, an electric energy metering circuit 2, a data storage circuit 3, an infrared interface circuit 4, an RS485 circuit 5, and a pulse output circuit 6. The power-down detection circuit 7 is respectively connected with the single-chip microcomputer 1 and transmits corresponding signals. The electric energy metering circuit 2 is also connected to the voltage sampling circuit 9 and the current sampling circuit 10 respectively. The single-chip microcomputer is also connected with the display circuit 11 for displaying various parameters. The power supply circuit 8 supplies power to the single-chip microcomputer 1 , the electric energy met...

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Abstract

The invention comprises the following steps: detecting whether a meter checking order exists; if yes, executing the next step, and if not, returning to the previous step; judging whether the order is an initial adjustment order; if so, executing the early adjustment meter checking; if not, then re-detecting; the early adjustment meter checking comprises the following steps: reading the power value P1 transmitted by a power meter, calculating the meter checking pulse cycle T according to the equation: T is equal to 3600/(P1 multiplying Cl), wherein, C1 is a pulse constant and is a fixed value set on the power meter; reading the cycle T1 of the high-frequency pulse outputted by a measurement circuit; calculating the high-frequency pulse dividing frequency K of the measurement circuit, according to the equation: K is equal to T/T1; and dividing the frequency based on the high-frequency pulse dividing frequency K so as to obtain the meter checking pulse. The invention eliminates the adjustable resistor network and reduces the hardware costs, which can greatly improve the meter checking efficiency, reduce labor intensity, realize fully automated operation and achieve more precise calibration.

Description

technical field [0001] The invention relates to a meter calibration method of an electric energy meter, in particular to an automatic meter calibration method of a single-phase electronic electric energy meter. Background technique [0002] The traditional method of calibrating the energy meter is usually to set 5 to 7 series resistors with fixed resistance values ​​when designing the resistance network of the voltage sampling circuit, and then put 8 to 10 resistance values ​​according to 2 n The series resistors of decreasing order adjust the network, and these resistors are called adjustment resistors. Each resistor is provided with a short-circuit point. According to the percentage error displayed by the meter calibration device, the resistance value of the voltage sampling circuit is reduced by short-circuiting a resistor with an appropriate resistance value, thereby increasing the sampling voltage and making the low-frequency meter calibration output by the metering cir...

Claims

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Application Information

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IPC IPC(8): G01R35/04
Inventor 付应江
Owner JIANGSU KAOU WANHONG ELECTRON
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