Electric energy metering method and device

A technology of electric energy measurement and current, which is applied in the direction of electric power measurement, voltage/current isolation, signal transmission system, etc. through the application of digital technology, which can solve problems such as malfunction, neutral line and phase line short circuit, etc., to reduce the cost of electric meters , Improving the linearity of large signals and avoiding the effect of linearity degradation

Inactive Publication Date: 2011-12-21
MIARTECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when both currents are adopted by manganese-copper shunt resistors, if non-isolated shunt resistors are used for sampling, it will be caused by the short circuit between the neutral line and the phase line due to the common ground connection of the two sampling circuits. Can not work normally

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  • Electric energy metering method and device
  • Electric energy metering method and device
  • Electric energy metering method and device

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Embodiment Construction

[0030] The method and device for measuring electric energy with dual current paths provided by the present invention can use two shunt resistors to perform current sampling on phase line and neutral line current respectively, thereby reducing cost and improving large current linearity. A preferred embodiment of the present invention is described below.

[0031] Such as figure 2 As shown, the electric energy metering device 20 of the present invention includes a first detection resistor R1, which is arranged on the first power transmission line, such as the neutral line 11, and the neutral line current I flows thereon. 1 . The first sampling circuit 21 is connected to the first detection resistor R1 to detect the neutral current I 1 , and through necessary signal conversion (such as ADC), obtain a first current data D 1 . The first sampling circuit 21 can be designed according to common techniques in the art, and there is no limitation here. This device 20 also includes a ...

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Abstract

The invention relates to an electric energy metering method and device, and the method includes the following steps. A first detection resistor is arranged on a first transmission line, and a first current on the first transmission line is sampled through a first sampling circuit connected to the first detection resistance to obtain a first current data; A second detection resistor is arranged on the transmission line, and a second current on the second transmission line is sampled through a second sampling circuit connected to the second detection resistance to obtain a second current data; the first transmission line and the first transmission line are detected voltage between two power lines; and transmitting the first current data, the second current data and the voltage to a digital processing engine, wherein at least one of the first current data and the second current data is transmitted in an isolated manner transmitted to the digital processing engine. Therefore, the sampling circuit is allowed to use two manganese-copper detection resistors for sampling, which reduces the cost and improves the linearity of large signals.

Description

technical field [0001] The invention relates to an electric energy metering method and device. Background technique [0002] Electric energy metering refers to the acquisition of voltage and current in the power transmission line, and based on this, the electric energy consumed by the load of the transmission line is calculated. A general power transmission line includes at least two phases (such as a phase line and a neutral line). In order to prevent some stealing behaviors that only use one of the phases for power consumption, the dual current path energy metering method is generally used to measure the current of the phase line and the neutral line at the same time. To detect, when the current of the phase line and the current of the neutral line are inconsistent, the system will automatically select a channel with a larger current for energy measurement. Due to the need to detect the current of the phase line and the neutral line at the same time, the mains voltage exi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R21/133G01R15/22G08C17/02
Inventor 宋朝盛
Owner MIARTECH
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