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12) Minimum total for creepage distance for :1810
heavily polluted atmosphere: (mm)
13) Reference standard for PTS : I.S 2705, 1992
14) Reference standard for oil : I.S 335, 1993
15) Max. temp. Rise over design Ambient
Temp. at rated current & frequency : Max 50 over 50 Deg. Cent.
16) The 66kv PTS shall be outdoor type, single phase, 50 HZ, oil filled, Hermetically
sealed with SS bellow, dead tank suitable for Hot line washing.
2.4.2 The ratings specified shall be guaranteed at all primary connections. Any changes in the
particulars of the CTs that may be required for the protective relays (protective relays being
procured separately) actually shall have to be met by the supplier of CTs without any extra
cost.
2.4.3 All current transformers shall meet the requirements of this specification for 3% variation
in rated system frequency of 50 Hz.
2.4.4 EARTH QUAKE & WIND DESIGN LOADS:
Each CT, including its supporting structure shall be designed to withstand repeated
earthquake acceleration of 0.08 x 2g with wind loads of 150 kg/m2 on the projected are (nonsimultaneous)
without damage to component parts and without impairment of operation.
2.4.5 The class insulation will be A or better.
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