IEC 62271-110-2005 pdf – High-voltage switchgear and controlgear – Part 110: Inductive load switching

IEC 62271-110-2005 pdf – High-voltage switchgear and controlgear – Part 110: Inductive load switching.
1 General 1.1 Scope This International Standard 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 1000 V and applied for inductive current switching with or without additional short-circuit 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 [1] 1 . 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 the guide for application of IEC 62271-100 and IEC 60694 (hereafter referred to as the guide [2]), 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 circuit- breaker 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 is otherwise applicable. 1.2 Normative references Subclause 1.2 of IEC 62271-100 is applicable with the following addition:
2 Normal and special service conditions Clause 2 of IEC 60694 is applicable. 3 Definitions For the purposes of this document, the definitions of IEC 60050(441) and IEC 60694 apply. 4 Ratings Clause 4 of IEC 62271-100 is applicable except for the references to short-line faults, out-of- phase making and breaking, capacitive current switching and as noted in specific subclauses below. 4.1 Rated voltage (U r ) Subclause 4.1 of IEC 60694 is applicable. 4.2 Rated insulation level Subclause 4.2 of IEC 60694 is applicable with the following addition: The rated values stated in Tables 1a and 1b and Tables 2a and 2b of IEC 60694 are applicable with the exception of column (8) in the latter two tables. NOTE 1 The reason for this exception is the passive nature of the shunt reactor load circuit. NOTE 2 In some cases (high chopping overvoltage levels, or where a neutral reactor is present or in cases of shunt reactors with isolated neutral), it may be necessary to specify an appropriate insulation level which is higher than the rated values given in Tables 1a, 1b, 2a and 2b. 4.3 Rated frequency (f r ) Subclause 4.3 of IEC 60694 is applicable with the following addition: The standard values for the rated frequency of high voltage circuit-breakers are 50 Hz and 60 Hz. 4.4 Rated normal current (I r ) and temperature rise Subclause 4.4 of IEC 60694 is applicable. 4.5 Rated short-time withstand current (I k ) Subclause 4.5 of IEC 62271-100 is applicable. 4.6 Rated peak withstand current (I p ) Subclause 4.6 of IEC 62271-100 is applicable. 4.7 Rated duration of short-circuit (t k ) Subclause 4.7 of IEC 62271-100 is applicable.
4.8 Rated supply voltage of closing and opening devices and of auxiliary and control circuits (U a ) Subclause 4.8 of IEC 60694 is applicable. 4.9 Rated supply frequency of closing and opening devices and auxiliary circuits Subclause 4.9 of IEC 60694 is applicable. 4.10 Rated pressure of compressed gas supply for insulation, operation and/or interruption Subclause 4.10 of IEC 60694 is applicable. 4.101 Rated short-circuit breaking current (I sc ) Subclause 4.101 of IEC 62271-100 is applicable. 4.102 Transient recovery voltage related to the rated short-circuit breaking current Subclause 4.102 of IEC 62271-100 is applicable. 4.103 Rated short-circuit making current Subclause 4.103 of IEC 62271-100 is applicable. 4.104 Rated operating sequence Subclause 4.104 of IEC 62271-100 is applicable. 4.108 Inductive load switching This standard is applicable thereby replacing IEC 61233. 4.109 Rated time quantities Subclause 4.109 of IEC 62271-100 is applicable. 4.110 Number of mechanical operations Subclause 4.110 of IEC 62271-100 is applicable. 5 Design and construction Clause 5 of IEC 62271-100 is applicable.