Railway applications – Fixed installations – Particular requirements for AC switchgear – Part 2: Disconnectors, earthing switches and switches with nominal voltage above 1 kV
|Publication Date:||1 February 2016|
|ICS Code (Railway rolling stock):||45.060|
This part of IEC 62505 is applicable to single-pole, two-pole and three-pole alternating current (a.c.) disconnectors, earthing switches and switches which are:
• designed for indoor or outdoor fixed installations in tractions systems, and
• operated with an a.c. line voltage and frequency as specified in IEC 60850.
NOTE 1 IEC 60850 specifies the a.c. traction systems:
15 kV 16,7 Hz,
12 kV 25 Hz,
12,5 kV, 20 kV also 25 kV with 50 Hz, and
12,5 kV, 20 kV, 25 kV also 50 kV with 60 Hz.
NOTE 2 As rails of a.c. traction systems are typically connected to earth and included in the return current path, all phase-to-earth voltages will be within the tolerances as specified in IEC 60850. Nevertheless, phase-to-phase voltages are sometimes higher, e.g. in autotransformer systems.