Electric energy gauging method and apparatus

A technology of electric energy measurement and current, applied in the direction of electric power measurement, voltage/current isolation, signal transmission system, etc. by applying digital technology, it can solve problems such as failure to work normally, short circuit of neutral line and phase line, etc., to reduce the cost of electric meters , Improve the linearity of large signals and avoid the effect of linearity degradation

Inactive Publication Date: 2009-07-15
MIARTECH
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  • Abstract
  • 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 gauging method and apparatus
  • Electric energy gauging method and apparatus
  • Electric energy gauging method and apparatus

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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 present invention relates to a power measurement method and device, the method comprising the following steps: setting a first detection resistor on a first power line and sampling the first current on the first power line by a first sampling circuit connected with the first detection resistor to obtain a first current data; setting a second resistor on a second power line and sampling the second current on the second power line by a second sampling circuit connected with the second detection resistor to obtain a second current data; detecting the voltage between the first power line and the second power line; and transmitting the first current data, the second current data and the voltage to a digital treatment engine, wherein at least one of the first current data and the second current data is transmitted to the digital treatment engine by an isolation transmission way. Thus the sampling circuit samples using a 2-way manganin detection resistor, thereby reducing the cost and increasing the large-signal linearity.

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 Applications(China)
IPC IPC(8): G01R21/133G01R15/22G08C17/02
Inventor 宋朝盛
Owner MIARTECH
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