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type vsa12, vsa12b, vsa16, vsa20, and vsa20a operation and installation instructions
MN280063EN May 2017
Operation
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this equipment is not intended to protect human
life. follow all locally approved procedures and safety
practices when installing or operating this equipment.
failure to comply can result in death, severe personal
injury, and equipment damage.
g102.1
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hazardous voltage. always use a hotstick when working
with this equipment. failure to do so could result in
contact with high voltage, which will cause death or
severe personal injury.
g108.1
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hazardous voltage. do not rely on the open position
of the yellow operating handle or the contact position
indicator; it does not ensure that the line has been
de-energized. always establish a visible disconnect.
failure to follow proper safety practices can result in
contact with high voltage, which will cause death or
severe personal injury.
g114.1
VSA three-phase reclosers feature vacuum interruption and
air insulation. Current interruption takes place in the vacuum
interrupter assemblies that are suspended from the recloser
cover by insulating supports. See Figures 12 and 13. The
moving contacts, which are located in each interrupter
assembly and driven by the recloser operating mechanism,
close or open the circuit. Arc interruption takes place within
one cycle while utilizing a stroke of approximately one-half
inch.
figure 12. type vSa20 vacuum recloser with inspection
cover removed.
figure 13. vSa20 vacuum interrupter assembly.
Recloser tripping and closing are initiated by signals from
the recloser control unit. When current in excess of the
programmed minimum trip level is detected on any phase
or phases, the recloser control initiates a trip signal which
energizes a solenoid in the operating mechanism of the
recloser. When actuated, this solenoid trips the opening
springs which opens the interrupter contacts.
Closing springs provide the force required to close the
vacuum interrupters as well as the force required to charge
the opening springs. A 240 Vac motor charges the closing
springs through a multi-stage gear drive. When 240 Vac is
present, the motor is automatically operated to keep the
closing springs in a charged state.
To close the recloser, the control initiates a signal which
energizes a solenoid in the recloser operating mechanism.
Once actuated, the solenoid releases the closing springs,
closing the vacuum interrupters. At the same time, the
opening springs are charged and, when 240 Vac is present,
the closing springs are charged. An external 240 Vac source
is required to operate the drive motor.
Recloser tripping employs stored spring energy. The 240
Vdc supply is not required to trip the recloser. When the trip
solenoid is actuated by the 24 Vdc trip signal, the stored
spring energy is released to open the recloser. The 24 Vdc
trip signal is originated at the recloser control.
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Bushing Lead
Vacuum Interupter
Bushing
Bushing Lead
Current Exchange Assembly
Support Stringer
Vacuum Interrupter
