The following interlocks are provided for the Horizontal centre break disconnectors.
A Mechanical constructional interlock between the disconnector and earth switch
has been provided to ensure that the Earth Switch can be closed only when the Disconnector
is in the open position and vive versa.
An electro-mechanical bolt coil type interlock has been provided in each motor
operating mechanism for interlocking between manual and motor operation of Disconnector
/ Earth switch. This ensures that the motor circuit is cut off when the manual operation
is under progress.
In some cases, only electrical bolt coils are provided as interlocks solely controlled
by electrical circuits.
Based on customer needs either Electro-mechanical or Electrical interlocks will
Electrical contact is provided in the Electrical circuit of the Motor Operating
Mechanism for the Purchaser to write in the external interlocks if any to ensue
that the Disconnectors / Earth switch can be operated only if all the interlocking
conditions are satisfied.
Horizontal Centre Break Disconnector can be supplied by us either without Earth
switch, with Single Earth switch or with Double Earth switch.
Centre Break Disconnectors are normally offered for Horizontal, normal level, upright
mounting. But on request these can be offered for other types of mounting like series,
vertical, higher, level, underhung, tandem etc.,
Horizontal Centre Break disconnectors / Earth switches supplied by us are generally
Mechanically Ganged for operation of all three poles from a common operating mechanism
cabinet. However we can supply 420kV Centre Break Disconnectors with the three poles
being operated by 3 separate mechanisms, which are electrically ganged to operated
together, if so desired by the purchaser.