Howard HI-104 Single-Phase Pad Transformer - Manual (Page 15)

Document 2.4.96, Revision 0
March, 2013
15
Single-Phase Pad-Mounted Compartmental-Type Distribution Transformers
The following operating instructions and descriptions
of switching and fusing devices are intended to be a
general guide for operation of Howard single-phase
pad-mounted transformers in normal environments.
Although every effort has been made to ensure ac-
curacy and completeness, these instructions and
descriptions do not address every conceivable ap-
plication or circumstance that might be encountered.
Personnel should read and comply with any safety
and instructional labels that might accompany any
accessory device.
Some of the accessory devices described below are
optional and may not be present in any particular
transformer design. The inclusion of particular acces-
sory devices in any transformer design is governed
by industry standards and by individual customer
specifications.
▲
! WARNING
FAILURE TO FOLLOW THE INSTRUCTIONS
BELOW COULD RESULT IN DEATH OR SERIOUS
PERSONAL INJURY, AND COULD ALSO RESULT
IN DAMAGE TO THE EQUIPMENT.
• Do not operate load-break equipment if a
fault condition is suspected.
• Use a live-line tool (hot stick or shotgun stick)
to operate transformer load-break equip-
ment. Do not attempt to operate by hand any
device that is designed to be operated with a
live-line tool.
• After operating transformer loadbreak equip-
ment, check that voltages at transformer
terminals are the expected values. Checking
voltages verifies that loadbreak equipment
operated properly and that electrical circuit
conditions are as expected.
• Before servicing the transformer, always
de-energize the transformer from a remote
location and then proceed to ground all
primary and secondary transformer terminals
following industry-accepted safe grounding
practices. Grounding secondary terminals
protects against situations such as a standby
generator energizing transformer from the
secondary circuit.
• Follow industry accepted-safety practices.
Utilize personal protective equipment (PPE)
when working with this equipment.
• Do not operate fluid-immersed load-break
fusing and switching devices when the insu-
lating fluid temperature is below the following
limits:
-20°C (-4°F) for conventional transform-
er oil and silicone fluid
0°C (32°F) for R-Temp fluid
-10°C (14°F) for natural ester fluid
SECTION 5: OPERATION OF SWITCHING AND PROTECTIVE DEVICES