Installation method of capacitor units of equipotential shielding capacitor voltage transformer

Abstract

The invention relates to a method for installing a capacitor unit of an equipotential shielded capacitive voltage transformer, comprising the following steps: step 1: install a shielded capacitor support flange; step 2: install a shielded capacitor; step 3: install an electrical connection; 4: Install the supporting insulator of the main capacitor and the end sealing flange; Step 5: Connect the supporting insulator of the main capacitor and its bottom; Step 6: Fix the composite sleeve and the end sealing flange. The method realizes reasonable, safe and fast installation of the capacitor unit of the equipotential shielding CVT. During the installation process, fully consider the structural shape, material properties, strength, and electrical performance of each component in the capacitor unit, choose reasonable installation steps, clever component connection methods, and fully select and utilize conventional fasteners, mechanical components, etc. Machined parts and installation tools avoid the use of large and complex tools or special tools, thus making the installation work simpler and safer.

Description

technical field [0001] The invention relates to a method for installing a capacitor unit, in particular to a method for installing a capacitor unit of an equipotential shielding capacitive voltage transformer. Background technique [0002] With the engineering application of UHV (AC 1000kV and above) transmission technology in my country, the accurate measurement of UHV grid voltage has become a key technical problem to be studied and solved. The power frequency high voltage measurement devices widely used in power systems at home and abroad mainly include electromagnetic voltage transformers and capacitive voltage transformers (both of which are passive voltage measurement systems), which can basically meet the voltage requirements of 500kV and below. Metering and relay protection requirements. Photoelectric voltage transformers and electronic voltage transformers (both of which are active voltage measurement systems) are still in the process of research and development an...

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) Difficulty in on-site verification

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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