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P805-0011 Rev. A
©
2002 Hubbell Power Systems, Inc., 210 North Allen Street, Centralia, MO 65240 U.S.A.
Operation
!
WARNING
High Voltage Electric Arc Hazard.
Opening an energized disconnect switch without a loadbreak tool will
create an electrical arc.
Can cause death, severe personal injury or property damage.
Use appropriately rated loadbreak tool to open an energized by-pass
switch.
!
WARNING
High Voltage Electric Arc Hazard.
By-passing a voltage regulator without first setting the regulator to its
neutral position and without using a loadbreak tool to open the re-
maining disconnect blade will create an electrical arc.
Can cause death, severe personal injury or property damage.
Set regulator to its neutral position and use appropriately rated
loadbreak tool to open the remaining disconnect blade to by-pass a
voltage regulator.
• Standard BP3 switches have blade
guides on the left and right disconnect
blades. Open only after by-pass blade
has been closed electrically paralleling
the disconnect blades.
• The loadbreak hook option equips the
disconnect blades with single sided
loadbreak hooks. The loadbreak hooks
allow the use of a loadbreak tool for the
switching of load, capacitor, line/cable
charging and magnetizing currents.
• To open loadbreak hook equipped
disconnect or by-pass blades of an
energized by-pass disconnect switch,
use only an approved loadbreak tool
designed for use with switches.
• Follow the instructions provided with such
tools.
• When by-passing a voltage regulator,
except three-phase induction
regulator
, follow the steps outlined
below. For three-phase induction
regulators, contact supervisor or factory
representative.
1. Set voltage regulator automatic control to manual. Set voltage regulator to its neutral position. By-
pass blade is open. Disconnect blades are closed.
4. Open remaining disconnect blade using loadbreak tool to interrupt the voltage regulator
magnetizing current. By-pass blade is closed. Disconnect blades are open.
5. Reverse the above sequence of steps to return a voltage regulator to service.
2. Close by-pass blade. The by-pass blade shunts the voltage regulator series winding. Disconnect
blades are closed.
3. Open either disconnect blade to disconnect the voltage regulator series winding. By-pass blade is
closed. Voltage regulator shunt winding remains energized through other disconnect blade.
