26
S&C Instruction Sheet 716-502
Operation
Figure 25. Switch-position indicator in the OPEN position.
Switch-position indicator in the CLOSED position.
Understanding Trip-Free Operation
The stored-energy mechanism has an instantaneous trip-free
capability. If the Series 2000 Circuit-Switcher is closed into
a fault sensed by the user-furnished relaying, the mechanism
will immediately trip. To accomplish trip-free operation, the
stored-energy mechanism uses two spring assemblies: one
for closing and one for opening. Both springs are charged by
the operator motor before the circuit-switcher can be closed.
Recharging time after a Trip operation is approximately 10
seconds for Model 2040 Circuit-Switchers rated 69 kV through
138 kV and 16 seconds for circuit-switchers rated 161 kV and
230 kV.
Electrical Operation
To Open
the circuit-switcher, press the TRIP pushbutton or
send a remote trip signal to the switch operator. See Figure
16 on page 20.
The opening latch in the stored-energy mechanism will
release, discharging the opening spring. This action trips
the interrupters and forces the opening and closing pistons
in the mechanism downward, which can be seen in the DIS-
CHARGED indicator window inside the operator. See Figure
26 on page 27. The switch-position indicator on the high-speed
base will move to the Open position. See Figure 25. Further,
if the position-indicating lamp option (catalog number suffix
“-M”) has been specified, the green lamp will light.
The motor-driven cam in the stored-energy mechanism will
immediately start rising, thereby charging both the opening
and closing springs; when the opening spring latches, the indi-
cator will again be visible at the CHARGED indicator window.
To Close
the circuit-switcher, press the CLOSE pushbutton or
send a remote close signal to the switch operator. See Figure
16 on page 20.
The motor-driven cam in the stored-energy mechanism will
immediately start retracting. The closing latch will release, dis-
charging the closing spring. This action closes the interrupters.
The switch-position indicator on the high-speed base will move
the Closed position. See Figure 25. If the position-indicating
lamp option has been specified, the red lamp will light.
The circuit-switcher may also be electrically operated
via remotely located control switches. No instructions are
included for remote control because control schemes vary
with the installation and specific application of the switch.
