Isolators Sample Clauses

Isolators. The isolators shall comply to IEC 62271-102 in general. Isolators shall be motor (DC powered) operated. Earth switches are provided at various locations to facilitate maintenance. Main blades and earth blades shall be interlocked and interlock shall be fail safe type. All earth switches shall be motor operated type. Isolator shall be suitable for Bus Transfer Current Switching duty as per IEC standard. High speed earthing switches shall be provided for grounding purpose at overhead line terminations & cable terminations & cable terminations and shall have fault making capability as specified. Earth switch for line isolator shall be of earthing switch class E1 and shall be suitable for induced current switching duty as defined for Class-B as per relevant standard.
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Isolators. Isolators shall be arranged to permit safe maintenance of any section of the equipment when the remainder are alive. They shall be suitable for operation while the equipment is alive and designed for them to make or break the charging currents of open busbars and connections or load currents shared by parallel circuits. The minimum total length of air gap between terminals of the same pole with the isolator open shall be designed to provide an impulse withstand level in excess of that specified for the insulation of the substation to earth. Such withstand shall preferably be not less than 15% greater than the withstand to earth and shall in no case be less than the minimum corresponding figure for the isolating distance as given in IEC 62271-102. Where manual operating mechanisms are required operation shall be possible from ground level. Isolator mechanisms shall be so designed that the primary contacts can not be opened by forces due to currents passing through them, and shall be self-locking in both the "open" and "close" positions. The mechanism shall open and close all poles simultaneously. Service conditions require that isolators shall remain alive and in service without being operated and without maintenance for periods of up to two years in corrosive atmosphere over a wide temperature range. In such conditions the contacts will be expected to remain capable of carrying this rated normal and short-circuit currents without overheating or welding. After such periods the maximum operating torque required shall not exceed twice the torque required during type tests and should be within the capabilities of one man (i.e. approx. 340 Nm). When made of steel or malleable iron, operating boxes, handles, rods, tubes and other fittings for outdoor type equipment shall be galvanised. Main bearings, pins etc. shall preferably be of the self lubricating type to reduce routine maintenance to a minimum.
Sample 1

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