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, 170 kV, and 245 kV NOTE 1—The series A voltages are applicable to North America and some other countries. The series B voltages are generally used outside North America. The series B voltages are the same as those identified as series I in IEC 62271-1:2007 [B23]. Voltages from both series are considered preferred in this standard. NOTE 2—Refer to Annex I for proposed values of rated maximum voltages for future design. Range II for rated maximum voltages above 245 kV 300 kV, 362 kV, 420 kV, 550 kV, and 800 kV Rated insulation level, U d , U s , U p The rated insulation level of switchgear shall be selected from the values given in Table 1a, Table 1b, Table 2a, and Table 2b. In these tables, the withstand voltage applies at the standardized reference atmosphere [temperature (20 °C), pressure (101.3 kPa), and humidity (11 g/m 3 )] 19 specified in IEEE Std 4. Insulation withstand capability is affected by altitude. For special service conditions, see 2.2 and Annex B. NOTE—For further information on insulation coordination, refer to IEEE Std 1313.1-2006 [B26], IEEE Std 1313.2, or to IEC 60071-1:2006 [B8] and IEC 60071-2:1996 [B9]. The rated values for lightning impulse withstand voltage (U p ), switching impulse withstand voltage (U s ) (when applicable), and power frequency withstand voltage (U d ) shall be selected without crossing the horizontal marked lines in Table 1a, Table 1b, Table 2a, and Table 2b.
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