Servo-pressure contact device for overlarge current primary current-carrying conductor

Abstract

The invention relates to a servo-pressure contact device for an overlarge current primary current-carrying conductor. According to the device, a hoop is respectively arranged at the upper part and the bottom end of a mobile primary current-carrying conductor, and is connected with the upper part and the bottom end of the mobile primary current-carrying conductor into a whole; bus-bars connected with a power supply source are correspondingly arranged under the hoops; the upper bus-bar is arranged on a primary current-carrying conductor in a sleeving manner, and the lower bus-bar is positioned under the primary current-carrying conductor; a servo-pressure contact structure is correspondingly arranged under each bus-bar, and opposite acting forces are generated from the servo-pressure contact structures, so that close face contact is formed between the hoops and the bus-bars. The servo-pressure contact device has the characteristics that parts of the servo-pressure contact device are closely contacted, the contact parts have small resistance, and equipment damage caused by local heat can be prevented. The servo-pressure contact device has simple structure and safe and reliable operation, has completely same test state and actual working condition and accurate testing data, and is suitable for performance testing of various current transformers and other electric appliances under a condition of 40KA or over.

Description

technical field [0001] The invention relates to a device for performance testing of electrical components under super-high current conditions, in particular to a follow-up pressure contact device for super-high current primary current-carrying conductors. Background technique [0002] At present, the rated power of large generators has reached 1000MVA or even greater, and the output current of generators can reach 30-50kA. This means that the current transformers used for generator sets are faced with increasingly harsh environmental conditions. First, the super-large current brings a sharp increase in magnetic field strength; second, the primary conductors are arranged in three-phase or six-phase. The phase spacing is reduced. The adjacent-phase interference caused by thermal power or nuclear power units is the most important; the third is the increase in ambient temperature caused by operation. In order to meet the above working conditions, higher requirements are put for...

AI Technical Summary

Problems solved by technology

When using the equal-ampere-turn method to verify and test the current transformer, there will be two problems: one is that the actual working environment cannot be simulated, and the other is that the stray magnetic field generated by the external current is superimposed on the main magnetic field of the primary equal-ampere-turn winding of the current transformer. , will generate an unevenly distributed magnetic field in the tested current transformer, which will cause a large difference between the test results and the actual working conditions, and the discreteness in the operation process is large, and the reproducibility is not good

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