Broadband voltage transformer

Abstract

The invention provides a broadband voltage transformer. The broadband voltage transformer comprises a hollow insulator, metal flanges, fixed flanges, a resistance-capacitance equalizing assembly, a resistance-capacitance hybrid voltage divider, a base and a signal acquisition module; the metal flanges are mounted at both ends of the hollow insulator, the metal flange on the top of the hollow insulator is connected with a primary system, and the metal flange at the bottom of the hollow insulator is connected with the base; the fixed flanges are mounted on the inner walls of the metal flanges, and the two ends of the resistance-capacitance equalizing assembly are connected with the fixed flanges respectively; the top of the resistance-capacitance hybrid voltage divider is connected with theprimary system, and the bottom of the resistance-capacitance hybrid voltage divider is connected with the signal acquisition module. The broadband voltage transformer is high in insulation reliabilityand voltage measurement precision and capable of achieving accurate measurement of broadband voltage signals. The provided broadband voltage transformer is applicable to both an alternative-current system and a direct-current system and has a wide application range, and the application range specifically involves direct-current power transmission engineering, alternative-current power transmission / distribution engineering, high-speed railway power grids and any fields and occasions with broadband voltage signal measurement demands.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a high-precision, fast-response, high-reliability broadband voltage transformer free from on-site verification. Background technique [0002] The DC voltage transformer is an indispensable main equipment in the DC transmission system, which plays an important role in electric energy metering, power monitoring, and relay protection signal transmission. The DC voltage transformer in the prior art is composed of a resistor divider composed of a series of resistor elements connected in series. In order to prevent the resistor divider from being affected by various transient overvoltages (including lightning overvoltage), usually in the resistor A voltage equalizing capacitor is connected in parallel on the voltage divider. The specific schematic diagram of DC voltage transformer is as follows: figure 1 shown. Depending on the voltage level, the stages of the resistive divide...

AI Technical Summary

Problems solved by technology

[0017] In order to overcome the shortcomings of low primary insulation reliability, low voltage measurement accuracy and inability to realize accurate measurement of broadband voltage signals in the above-mentioned prior art, the present invention provides a broadband voltage transformer, including hollow insulators, metal flanges, and fixed flanges. , resistance-capacity equalizing components, resistance-capacity hybrid voltage divider, base and signal acquisition module; metal flanges are installed at both ends of the hollow insulator, the metal flange at the top of the hollow insulator is connected to the primary system, and the metal flange at the bottom of the hollow insulator The flange is connected to the base; the inner wall of the metal flange is installed with a fixed flange, and the two ends of the resistance-capacity equalizing component are respectively connected to the fixed flange; the top of the resistance-capacity hybrid voltage divider is connected to the primary system, and its bottom is connected to the signal acquisition module

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