Method and device for detecting abnormity of zero line of electric quantity metering device

A technology of electricity measurement and detection method, which is applied in the direction of measuring devices, measuring electrical variables, and measuring time integration, etc. It can solve the problems of easy misjudgment, ineffective isolation, and insufficient sensitivity of zero-line interference to steal electricity, and achieve the effect of isolating interference

Active Publication Date: 2009-08-26
SHENZHEN KAIFA TECH (CHENGDU) CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a detection method and device for the abnormality of the zero line of the electricity metering de

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  • Method and device for detecting abnormity of zero line of electric quantity metering device
  • Method and device for detecting abnormity of zero line of electric quantity metering device
  • Method and device for detecting abnormity of zero line of electric quantity metering device

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Embodiment Construction

[0037] The method for detecting the abnormality of the zero line of the electricity metering device of the present invention uses the phase-to-phase voltage angle and the voltage unbalance value of the three-phase voltage as the judgment basis. The electricity metering device is connected to the neutral line by a neutral line on-off control circuit that controls on-off based on external signals.

[0038] Such as figure 1 As shown, in the first embodiment of the method for detecting the abnormality of the zero line of the electricity metering device of the present invention, the judgment of the zero line interference is mainly performed, including the steps:

[0039] Step S11: Measure the phase-to-phase voltage angle value and the effective value of the three-phase voltage of the current electricity metering device. The metering chip can be used for data acquisition of three-phase voltage effective value and voltage angle value.

[0040] Step S12: Calculate the voltage unbala...

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Abstract

The invention relates to a method for detecting abnormity of a zero line of an electric quantity metering device, which comprises the following steps: (1) measuring a phase-to-phase voltage included angle value and a voltage effective value of each phase of the electric quantity metering device; (b) calculating a voltage imbalance value of the electric quantity metering device according to the voltage effective value; and (c) generating abnormal signals existing in the electric quantity metering device when the phase-to-phase voltage included angle value is not within a normal range and the voltage imbalance value reaches a stated threshold value. The method and the device can accurately detect the electricity stealing behavior of applying interference to the electric quantity metering device, adopt the measures such as recording interference events or temporarily cutting off the zero line to sample and the like when the interference exists, and protect the legal interests of a power company.

Description

technical field [0001] The invention relates to the technology of electricity metering devices, more specifically, to a method and device for detecting abnormality of the neutral line of the electricity metering device. Background technique [0002] At present, there are electricity stealing methods that impose interference on the zero line of the three-phase four-wire electricity metering device, and the commonly used methods include the DC interference method and the AC interference method. The DC interference method means that any phase or two-phase voltage is connected to the neutral line through a diode as the neutral line input of the power metering device. The AC interference method is to use any phase line and neutral line to output an AC voltage through a transformer and then use it as the neutral line input of the power metering device, or directly use any phase line as the neutral line input. [0003] This method of stealing electricity by interfering with the ze...

Claims

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Application Information

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IPC IPC(8): G01R35/00G01R35/04G01R11/24
Inventor 邓伟华
Owner SHENZHEN KAIFA TECH (CHENGDU) CO LTD
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