Three-phase electric energy meter on-site calibration instrument detachable current transformer

Abstract

The invention discloses a three-phase electric energy meter on-site calibration instrument detachable current transformer which is characterized in that a current transformer module which is externally arranged on a three-phase electric energy meter calibration instrument in a detachable mode is included; the current transformer module comprises three current transformers, primary winding ends of the three current transformers are respectively connected with a primary current connecting terminal, secondary winding ends of the three current transformers are connected to secondary connecting ports together, the secondary connecting ports and a current measuring connector on the calibration instrument are matched and electrically communicated. The current transformer module of the current transformer and a calibration instrument body are in an external-split mode, the current transformer can be combined with the calibration instrument for use or be disassembled from the calibration instrument according to needs, and the size of the electric energy meter on-site calibration instrument is reduced. Measuring accuracy and carrying and using convenience are achieved at the same time, and electric energy meter on-site calibration instrument miniaturization handheld operation is achieved. The current transformer can be widely used in the electric energy meter on-site calibration instrument.

Description

[0001] technical field [0002] The invention relates to an instrument high-precision transformer used for direct current testing of a three-phase electric energy meter field calibrator. It is an external part of the three-phase electric energy meter field calibrator. The addition of this part can effectively improve the test level of the calibrator. Background technique [0003] At present, the three-phase electric energy meter field calibrator at home and abroad is equipped with a set of clamp current transformers for indirect measurement, but the test accuracy is low, and it can only be used for low-level electric energy meter (level 1 or level 2) testing. In order to be able to test high-grade energy meters (0.5 or 0.2), the current test circuit must be directly measured with a high-precision current transformer. A high-precision current transformer is installed inside the instrument, and each high-precision current transformer is generally relatively large in size, res...

AI Technical Summary

Problems solved by technology

A high-precision current transformer is installed inside the instrument. Each high-precision current transformer is generally relatively large in size, resulting in a large volume and heavy weight of the test instrument, which is very inconvenient to carry and use.

At present, there are many low-level electric energy meters (level 1 or level 2) installed on site, and clamp current transformers are generally used for indirect measurement during testing. In many cases, direct current transformers are not needed.

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