TEL TAVRIDA ELECTRIC VCB15 LD, Руководство пользователя

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6.1.3 Emergency opening
The ISM can also be opened manually. When the synchronizing shaft is rotated, a force exceeding the magnetic
attraction forces of the ring magnet is applied to the armature, which subsequently starts to move. As the air
gap increases, the opening springs and the contact pressure springs overcome the magnetic holding force, and
the vacuum interrupter opens.
To open the ISM15_LD and ISM25_LD manually, the force shall be applied to the interlocking pins or torque shall
be applied to the stub shaft - see Figure 84. Force shall be applied along the pin‘s movement axis and directed
to the ISM frame. The torque shall be applied in the direction of shaft rotation during ISM opening. The force or
torque influence shall not be applied at the end of pin‘s stroke or shaft rotation and shall not be applied to the
pin or shaft before ISM closing.
Figure 84
ISM15_LD and ISM25_LD manual trip execution.
Force or torque can be applied to any of the points shown above
6.1.2 Opening
To open the ISM main circuits, a trip command should be applied to the CM trip command input. It is a “dry
contact“ input so no external voltage should be applied. The trip command will be accepted if:
• CM state is “Ready” (Ready LED flashes green) or within 60 seconds after the removal of the auxiliary power
supply;
• optional electrical interlock is unlocked;
• mechanical and electrical interlock is unlocked (in case of ISM15_Shell_2 only).
If the trip command is applied and kept before the CM is in a “Ready“ state, the trip command will not be
accepted.