IEEE C37.100.1-2007 IEEE Standard of Common Requirements for High Voltage Power Switchgear Rated Above 1000 V

IEEE C37.100.1-2007 IEEE Standard of Common Requirements for High Voltage Power Switchgear Rated Above 1000 V. 3. Definitions For the purposes of this standard, the following terms and definitions apply. IEEE Std C37.100 [B37] should be referenced for terms not defined in this clause. For terms that are not listed in IEEE Std C37.100 [B37], users should refer to The Authoritative Dictionary of IEEE Standards Terms [B24]. An asterisk (*) indicates that at the time this standard was approved, there were no corresponding definitions in IEEE Std C37.100 [B37]. NOTE—The IEC counterpart to IEEE Std C37.100 [B37] is the IEC 60050 series of standards [B1], [B2], [B3], [B4], [B5]. 3.1 disconnector: A mechanical switching device that provides, in the open position, an isolating distance in accordance with specified requirements. (See IEC 60050-441:1984 [B3].) NOTE—A disconnector is capable of opening and closing a circuit when either negligible current is broken or made, or when no significant change in the voltage across the terminals of each of the poles of the disconnector occurs. It is also capable of carrying currents under normal conditions and carrying for a specified time currents under abnormal conditions such as those of short circuit. 3.2 IP coding*: A coding system to indicate the degrees of protection provided by an enclosure against access to hazardous parts, ingress of solid foreign objects, ingress of water, and to give additional information in connection with such protection. (See 3.4 of ANSI/IEC 60529:2003.) 3.3 isolating distance* (of a pole of a mechanical switching device): The clearance between the contacts, or any conductive parts connected thereto, of a pole of a mechanical switching device in the open position meeting the functional requirements specified for disconnectors. 4.2 Rated maximum voltage (V) or (U r ) The rated maximum voltage indicates the upper limit of the highest voltage of systems for which the switchgear is intended. The preferred values of rated maximum voltage are given in 4.1.1 and 4.1.2. Range I for rated maximum voltages of 245 kV and below Series A (based on the current practice in North America and some other countries): 4.76 kV, 8.25 kV, 15 kV, 15.5 kV, 25.8 kV, 27 kV, 38 kV, 48.3 kV, 72.5 kV, 123 kV, 145 kV, 170 kV, and 245 kV Series B: 3.6 kV, 7.2 kV, 12 kV, 17.5 kV, 24 kV, 36 kV, 52 kV, 72.5 kV, 100 kV, 123 kV, 145 kV,...