Connecting flange of equipotential shielded capacitive voltage transformer

Abstract

The invention relates to a connection flange of an equipotential shielding capacitor type voltage transformer. The connection flange is installed at both ends of each capacitor unit, and an O-ring sealing groove is designed on the end surface, and an O-ring sealing groove of a corresponding specification is matched with the connection flange. The ring realizes the sealing of the capacitor unit. The center of the connecting flange is designed with a round hole, and the main capacitor supporting insulator is inserted into the round hole in a vertical manner. The double-layer reliability of the node is realized through the sealing design of the axial O-ring on the end face and the radial O-ring on the inner side. seal. The connection flange provided by the invention successfully solves the problems of assembly, storage and sealing of the capacitor unit, meets the requirement of mechanical strength, and at the same time serves as an electrode to realize the electrical connection of the shielding capacitor inside the capacitor unit.

Description

technical field [0001] The invention relates to a power system transformer device, in particular to a connecting flange of an equipotential shielding capacitive voltage transformer. Background technique [0002] With the application of UHV (AC 1000kV and above) transmission technology in engineering, it is necessary to accurately measure UHV grid voltage and corresponding technical equipment. The power frequency high voltage measurement devices widely used in the power system mainly include electromagnetic voltage transformers and capacitive voltage transformers (both of which are passive voltage measurement systems), which can basically meet the requirements of 500kV and below voltage level voltage measurement and Requirements for relay protection. Photoelectric voltage transformers and electronic voltage transformers belonging to active voltage measurement systems are still in the process of research and development and trial operation, and further research and solutions ...

AI Technical Summary

Problems solved by technology

Electric field simulation shows that for a 1000kV CVT, the capacitive current flowing from the high-voltage arm of the voltage divider into the ground can reach 20mA, causing significant measurement errors

Measures are usually taken to increase the main capacitance of the voltage divider to reduce the influence of stray currents, but even if the capacitance is increased to 10000pf, the accuracy level of UHV CVT is still difficult to reach the 0.1 standard

[0006] 2) On-site verification is difficult:

The introduction of energy storage components makes the response characteristics of transformers worse, and it is difficult to meet the requirements of fast and accurate action of UHV power grid relay protection

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