This part of IEC 62271 is applicable to a.c. circuit-breakers designed for indoor or outdoor installation@ for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above 1 000 V and applied for inductive current switching with or without additional shortcircuit current breaking duties. The standard is applicable to circuit-breakers in accordance with IEC 62271-100 that are used to switch high-voltage motor currents and shunt reactor currents and also to high-voltage contactors used to switch high-voltage motor currents as covered by IEC 62271-106. For circuit-breakers applied to switch shunt reactor currents at rated voltages according to IEC 62271-1:2007 Tables 2a and 2b@ combined voltage tests across the isolating distance are not required (refer to 4.2). Switching unloaded transformers@ i.e. breaking transformer magnetizing current@ is not considered in this standard. The reasons for this are as follows: a) due to the non-linearity of the transformer core@ it is not possible to correctly model the switching of transformer magnetizing current using linear components in a test laboratory. Tests conducted using an available transformer@ such as a test transformer@ will only be valid for the transformer tested and cannot be representative for other transformers; b) as detailed in IEC 62271-3061@ the characteristics of this duty are usually less severe than any other inductive current switching duty. It should be noted that such a duty may produce severe overvoltages within the transformer winding(s) depending on the circuitbreaker re-ignition behaviour and transformer winding resonance frequencies. Short-line faults@ out-of-phase current making and breaking and capacitive current switching are not applicable to circuit-breakers applied to switch shunt reactors or motors. These duties are therefore not included in this standard. Subclause 1.1 of IEC 62271-100:2008 is otherwise applicable.
IEC 62271-110:2012 history
0000 IEC 62271-110:2023 RLV
2018IEC 62271-110:2017/COR2:2018 High-voltage switchgear and controlgear - Part 110: Inductive load switching; Corrigendum 2
2017IEC 62271-110:2017/COR1:2017 High-voltage switchgear and controlgear - Part 110: Inductive load switching; Corrigendum 1
0000 IEC 62271-110:2017 RLV
2012IEC 62271-110:2012/COR1:2012 CORRIGENDUM 1 High-voltage switchgear and controlgear – Part 110: Inductive load switching (Edition 3.0)
2012IEC 62271-110:2012 High-voltage switchgear and controlgear - Part 110: Inductive load switching
2009IEC 62271-110:2009 High-voltage switchgear and controlgear - Part 110: Inductive load switching
2005IEC 62271-110:2005 High-voltage switchgear and controlgear - Part 110: Inductive load switching