Current transformer error test tooling

Abstract

The invention provides a current transformer error test tooling. The current transformer error test tooling aims to prevent a return conductor from influencing error test results of a current transformer. The current transformer error test tooling comprises a tooling bracket, the tooling bracket is provided with a test position used for horizontally placing a to-be-tested current transformer, thetooling bracket is supportedly provided with a shielding case located on the test position, the shielding case is provided with an upper opening for placing the to-be-tested current transformer, the upper opening is detachably provided with a shielding cover, the test tooling further comprises a primary conductor, the primary conductor comprises one or two vertical sections or above in series forpassing through the to-be-tested current transformer along a vertical direction. The shielding case and the shielding cover can shield the magnetic field produced by the return conductor, so that thereturn conductor can not exert an effect on the magnetic field of the vertical sections, and the accuracy of the error test is improved.

Description

technical field [0001] The invention relates to a tool for testing the error of a current transformer. Background technique [0002] Due to the rapid development of ultra-high voltage power transmission and transformation projects, the number of current transformers with high voltage levels and large transformation ratios has increased, and the primary current has become larger and larger. Ideally, when performing an error test on a current transformer coil, when a sufficiently long primary conductor passes through the ring-shaped current transformer coil, and the primary conductor is exactly located in the center of the ring-shaped current transformer coil, the primary current in the current transformer coil The magnetic field formed in the coil is a group of concentric circles, and the tangential magnetic field intensity at each point on the circle is the same everywhere. It can be considered that the ring current transformer coil is a closed magnetic flux tube, and the ri...

AI Technical Summary

Problems solved by technology

The part that does not pass through the center of the coil constitutes the return conductor, and the external wiring during the test will also become the return conductor. The return conductor will cause local magnetic field concentration at the transformer coil, and the magnetic field will be unevenly distributed along the magnetic circuit, resulting in two current transformers. The measured value of the error of the secondary winding is greater than the design value

Images