Abb Schweiz Ag

Marcel Stupak

Dietmar Gentsch

Radek Javora

Tomas Kozel

Josef Cernohous

Stefano Magoni

Michal Skuci

Massimo Scarpellini

Michal Jerabek

A method for loose joint detection in medium voltage switchgears with busbar joints, circuit breaker upper and lower spouts, and cable connection joints, arranged in an air insulated housing, and medium voltage switchgear itself, in order to create an effective loose joint detection with lower operating expense, but with high performance and accuracy, involves measuring actual temperatures at a first phase as a first temperature (T), at a second phase as a second temperature (T), at a third phase as a third temperature (T), at predefined critical points, such as at the busbar joints, and/or at the circuit breaker upper spouts, and/or at the circuit breaker lower spouts, and/or the cable connection; and comparing temperatures in a logical dependency Ti&#x3e;(Tj+dT), with i&#x2260;j, permuted with i from 1, 2, 3, and j from 1, 2, 3, and setting the alarm if the logical dependency is fulfilled.

Method for loose joint detection in medium voltage switchgears and medium voltage switchgear itself

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Brno, Czechia

Marcel Stupak