1000kv electromagnetic accurate voltage mutual inductor for magnitude tracing

Abstract

The invention relates to an accurate electromagnetic voltage mutual inductor with the voltage of 1000kV and the quantity value traceability, which consists essentially of a case, a cannula, a top pressure equalizing ball and a lower pressure equalizing ring. Insulating gas SF6 is charged into the case, a mutual inductor body is symmetrically arranged in the bottom of the case, a splicing connector with a quincuncial contact head is used for the transitive connection between a primary contact tube that is arranged inside the cannula and a high-voltage winding and a high-voltage shielding cover that are arranged inside the mutual inductor body, the splicing connector is fixed on the case by an insulating limit tension rod on an upper end of the case, and the shielding inside the cannula adopts a basin-typed insulator, the splicing connector and reinforced supporters at two ends of the insulating limit tension rod; diameter of the top pressure equalizing ball is 2600mm, diameter (interior diameter) of the lower pressure equalizing ring is 1400nm, and loop diameter of the lower pressure equalizing ring is 250mm; a low-voltage winding in the mutual inductor body is evenly and tightly winded, and the high-voltage winding is winded in a step mode and totally has 56840 turns. The measuring uncertainty of the accurate electromagnetic voltage mutual inductor can be controlled at about 2 multiplied by 10<minus 5>, and the accuracy level can reach level 0.01.

Description

technical field [0001] The invention relates to a 1000kV electromagnetic precision voltage transformer for value traceability, which can be used for traceability, transmission and value storage of 1000kV voltage level power frequency voltage ratio standard value, 1000kV voltage level line voltage sensor error characteristic detection, 1000kV voltage It can also be used for scientific research in the UHV field, and it is a large-scale precision equipment for power frequency UHV testing and measurement. Background technique [0002] The implementation of my country's 1000kV AC UHV test and demonstration project has raised the voltage level of my country's power grid from 750kV to 1000kV, which has brought my country's power grid technology to a new level. With the increase of voltage level, the difficulty of design, manufacture and test of power equipment has increased sharply, and many UHV testing equipment is blank in the world, including 1000kV electromagnetic precision vol...

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Problems solved by technology

[0008] However, with the increase of the voltage level, especially the 1000kV (UHV) level, the structural design of the test equipment is the same as that of the UHV electrical equipment, and its insulation characteristics are in a saturated state, which cannot be carried out using the guiding ideology of geometric amplification on the structure. The design and manufacture of large-scale precision testing equipment requires major changes in many structural design details. First of all, the insulation requirements of 1000kV electromagnetic precision voltage transformers are guaranteed The short-time power frequency withstand voltage level, the height of the high-voltage outlet bushing reaches 8m, and the inner diameter of the bushing reaches 800mm, which leads to an increase in the size of the internal voltage equalization shield, and the internal structural support is very different from the 765kV standard voltage transformer; large Mechanical properties such as creep, thermal expansion and contraction of the size material lead to a large difference between the connection and installation of the primary conductive tube and the 765kV standard voltage transformer; the body inside the box, including the shielding size and edge curvature, The design and winding process of the high-voltage winding are all changed due to the increase of the internal insulation size, which needs to be modified on the basis of the design and manufacture of the 765kV standard voltage transformer

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