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Arrangement of secondary converter electronics for sensing currents in nominal conductors of a triple-phase enclosed gas-insulated switchgear module

IP.com Disclosure Number: IPCOM000249877D
Publication Date: 2017-Apr-21
Document File: 5 page(s) / 167K

Publishing Venue

The IP.com Prior Art Database

Related People

ABB Schweiz AG: OWNER

Related Documents

US5432438: PATAPP [+2]

Abstract

The present disclosure belongs to the field of non-conventional current sensing in gas-insulated switchgear (GIS), in particular to current sensing in high voltage applications. The measuring unit disclosed in this paper comprises a metal-clad enclosure and three nominal conductors R,S, and T arranged in a gas-insulated matter therein. At least one secondary converter is provided proximate to each one of the nominal conductors of phase R ,S, T on the outside of the enclosure for acting as a signal processing unit, each.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 53% of the total text.

1

Arrangement of secondary converter electronics for a triple-phase enclosed gas-insulated switchgear module Inventors: Ralf GRAF; Andreas SCHIBLI; Oliver FRITZ; Abstract: The present disclosure belongs to the field of non-conventional current sensing in gas-insulated switchgear (GIS), in particular to current sensing in high voltage applications. The measuring unit disclosed in this paper comprises a metal-clad enclosure and three nominal conductors R,S, and T arranged in a gas-insulated matter therein. At least one secondary converter is provided proximate to each one of the nominal conductors of phase R ,S, T on the outside of the enclosure for acting as a signal processing unit, each. Technological background: Measuring currents in a GIS by employing so-called Rogowski coils in gas-insulated switchgear is known in the art. From US 5,432,438 a combined current and voltage transformer for a high voltage GIS is known for a single-phase GIS. That combined current and voltage transformer has a current sensor and a voltage sensor and a signal processing unit. The current sensor contains a coil wound in the shape of a torus and the voltage sensor contains a hollow cylindrical test electrode, and in which after installation in the metal enclosure the coil and test electrode concentrically surround a conductor of the switching station. The advantage of such a set up resides in that it can be installed in a module that is comparatively small in dimensions such that no separate current sensing units and voltage sensing units are required. Such a combined current and voltage transformer comprising a combined Rogowski coil and differentiating capacitive voltage sensor with a common integrator in a GIS housing/module was brought to market many years ago and looks as follows.

2

An advantage of such a combined current and voltage transformer for metal-enclosed, gas- insulated high-voltage GIS resides in that it is cost effective in production, has small overall dimensions contributing to the overall compactness of the GIS, and has a high measurement accuracy. The drawback of the above-mentioned representative resides in that the combined current and voltage transformer is available only for single-phase systems, i.e. GIS where each nominal conductor (R, S, T) is arranged in a metal-clad enclosure of its own. From WO2013/135506 A1, a combined current and voltage transformer for a triple-phase enclosed gas-insulated switchgear is known. The core concept of that prior art resides in arranging the Rogowski coils within an auxiliary insulation body. The main drawback of that concept resides in that a barrier insulator is always required what affects the insulation concept of the GIS. Problem to be solved: There is an ongoing demand for compact multi-phase encapsulated GIS systems for substati...