Standard device for tracing 10kV-35kV high voltage electric energy value

Abstract

The invention relates to a standard device for tracing a 10kV-35kV high voltage electric energy value. The standard device comprises three high-voltage combined standard transformers (2A, 2B and 2C) and a low-voltage standard electric energy meter (3), wherein the three high-voltage combined standard transformers (2A, 2B and 2C) respectively receive low-voltage and low-current signals transformed by three-phase high voltage and heavy current by virtue of a primary wiring terminal (9); the low-voltage and low-current signals are transmitted to a three-phase voltage and current input terminal of the low-voltage standard electric energy meter (3) by virtue of a secondary wiring terminal (10) through cables (4A, 4B and 4C); rated secondary loads of the three high-voltage combined standard transformers (2A, 2B and 2C) are matched with the input impedance of the low-voltage standard electric energy meter (3). According to the standard device, voltage and current transformation is carried out by virtue of an electromagnetic voltage transformer and a current transformer; electric energy metering is carried out by virtue of the low-voltage standard electric energy meter, thus the standard device is reasonable in structure, simple and practical in energy value tracing, and high in accuracy and stable in performance.

Description

technical field [0001] The invention relates to electric energy measurement technology, in particular to a standard device for traceability of 10kV-35kV high-voltage electric energy value. Background technique [0002] The electric energy meter usually works under the environment with a voltage below 600V and a current within 100A. When the voltage or current exceeds the above range, it is necessary to use a voltage transformer (PT) and a current transformer (CT) to control the high voltage and large current according to a certain accuracy. degrees to the range that the energy meter can measure. As a result, a high-voltage electric energy metering and measurement and control technology system with low-voltage electric energy meters as the core and CT and PT as supporting components is formed. For the high-voltage electric energy metering device composed of such transformers and electric energy meters, the measurement error is related to current and voltage. The accuracy of ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a standard device for traceability of high-voltage electric energy value of 10kV ~ 35kV, to solve the problems that the existing measuring device cannot guarantee the overall error of the electric energy meter, the measurement accuracy is low, and the calculation method is complicated

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