INSTALLATION, USE AND MAINTENANCE MANUAL
EN
30
31
INSTALLATION, USE AND MAINTENANCE MANUAL
EN
B
owers Electricals Ltd, Heanor Gate Road, Heanor, Derbyshire DE75 7GX
Telephone: 01773 531531 (24 hours) Fax: 01773 716171
E-mail:
www.bowerselec.co.uk
B
owers Electricals Ltd, Heanor Gate Road, Heanor, Derbyshire DE75 7GX
Telephone: 01773 531531 (24 hours) Fax: 01773 716171
E-mail:
www.bowerselec.co.uk
• Continuous overload
above the foreseen level
• High unbalanced loads
• High harmonic loads
• Check and compare the
current supplied by the
transformer with the rating
plate. Reduce the load un-
der the rating value of the
transformer
• Install filters or chokes
before the equipment gen-
erating harmonics in order
to prevent their migration
on the transformer
Overheating measured on the core
• High eddy currents
on the core due to
loos-ening of the
tightening bolts
• Tighten the bolts of the
core according tightening
torque (See Paragraph
6.7)
Overheating measured on the MV/lV terminals
• Poor
contact
• Clean the areas of
contact
• Tighten bolts and nuts
2. Actuation of the
protection relay
(Alarm or
Tripping)
• Protection relay
failure
• Sensor failure
• Replace the damaged
relay
• Replace the faulty sensors
• Load current higher
than the rating values
• Reduce the load to the
nominal value indicated on
the rating plate
• Poor electrical or
sen-sors contacts
• Check, clean and if nec-
essary tighten all sensor
contacts
• Poor or insufficient
room ventilation
• Check the room venti-
lation system (damaged
fans, obstructed air louvers,
faulty protection devices)
• Increase cooling of the
installation room
3. Excessive noise
and /or vibrations
Please note that
the sound level at
the commis-
sioning stage may
decrease in a few
hours. Contact
the Manufactur-
er, if the noise
persists after a
few hours.
• Resonance with
surfaces around the
transformer
• Low frequency
• Resonance transmit-
ted by the connections
• Check for loose metallic
panels causing vibrations
• Increase the clearance
from these vibrating parts
• Use anti-vibrations pads
• Provide flexible elements
between the cables and the
transformer terminals
• Wrong tap
connection
• Check for the most suita-
ble voltage and adjust it to
the most suitable tap
• Core frames are not
properly fixed or loos-
ened
• Fix the external pulling
screws at the frames
• High input
voltage
• Check the correct val-
ues with the rating plate.
Reduce the load under the
rating value of the trans-
former.
4. Reduced Voltage • Improper primary tap
connection
• Check if the tap connec-
tions are correct and tight.
If the problem persists,
contact the Manufacturer.
29
3.
Excessive noise
and or vibrations
Please note that
the sound level at
the commissioning
stage may decrease
after a few hours.
Contact Bowers
Electricals Ltd, if
the noise persists
after a few hours.
•
Poor electrical or sensor
contacts.
•
Poor or insufficient
room ventilation.
•
Check, clean and if necessary
tighten all sensor contacts.
•
Check the room ventilation
system (damaged fans,
obstructed air louvres,
faulty protection devices)
•
Increase cooling of the
installation room.
•
Resonance with surfaces
around the transformer.
•
Low frequency.
•
Resonance transmitted
by the connections.
•
Check for loose metallic
panels causing vibrations.
•
Increase the clearance from
these vibrating parts.
•
Use anti-vibrations pads.
•
Provide flexible elements
between the cables and the
transformer terminals.
•
Wrong tap connection.
•
Core frames are not
properly fixed or loosened.
•
High input voltage.
•
Improper primary tap
connection.
•
Check for the most suitable
voltage and adjust it to the
most suitable tap.
•
Fix the external pulling
screws at the frames.
•
Check the correct values
against the rating plate.
•
Reduce the load under the
rating value of the transformer.
•
Check if the tap connections
are correct and tight.
If the problem persists,
contact the Manufacturer.
Reduced Voltage.
4.
Tel: 01773 531531 [email protected] www.bowerselec.co.uk
3
INSTALLATION, USE AND MAINTENANCE MANUAL
EN
APPENDIX
1.0 – REFERENCE STANDARDS
2.0 – RATING PLATE
3.0 – LIST OF COMPONENTS AND ACCESSORIES
4.0 – IMPORTANT NOTICE
5.0 – RECEIVING, HANDLING AND STORING
5.1 – RECEIVING
5.2 – HANDLING
5.3 – STORAGE
6.0 – INSTALLATION
6.1 – SITE PREPARATION
6.2 – STANDARD INSTALLATION CONDITIONS
6.3 – WORKING TEMPERATURE
6.4 – VENTILATION
6.4.1 – NATURAL / FORCED VENTILATION OF THE
INSTALLATION ROOM
6.4.2 – FORCED VENTILATION OF THE TRANSFORMER
6.5 – INSULATION DISTANCES
6.6 – SAFETY DISTANCE
6.7 – TIGHTENING TORQUE FOR ELECTRICAL & MECHNICAL
CONNECTIONS
6.8 – VISUAL INSPECTION
B
owers Electricals Ltd, Heanor Gate Road, Heanor, Derbyshire DE75 7GX
Telephone: 01773 531531 (24 hours) Fax: 01773 716171
E-mail:
www.bowerselec.co.uk
CAST RESIN TRANSFORMER:
Installation, Operation &
Maintenance Manual