Westinghouse PS-1002, Инструкция, Страница: 23 / 36

6. INSTALLATION
6 . 1
Precautions
SAFETY
GOOD SAFETY PRACTICES MUST BE FOLLOWED
DURING THE INSPECTION AND INSTALLATION OF
TRANSFORMERS. IN ADDITION, THERE ARE PRO·
CEDURES THAT ARE MO RE OR LESS PECULIAR TO
TRANSFORMERS WHICH SHOULD BE FOLLOWED
FOR THE PROTECTION OF WORKMEN AND OF THE
TRANSFOfu\fER.
TH E TRANSFORMER TANK MUST BE GROUNDED
AT ALL TIMES. WINDINGS AND BUSHINGS MUST BE
GROUNDED EXCEPT WHEN ELECTRICAL TESTS
ARE BEING MADE. ALL FLUID HANDLING EQUIP­
MENT AND VACUUM PUMPS MUST ALSO BE
GROUNDED. THIS WILL REDUCE THE POSSIBILITY
O F STATIC DISCHARGES.
ELECTRICAL TESTS MUST NOT BE PERFORMED
WHEN VACUUM IS APPLIED TO THE TRANSFORM ER
IF SUCH TEST PRODUCES A POTENTIAL OF MORE
THAN
1 25 VOLTS ANYWHERE IN THE TRANS·
FORMER.
FIRE EXTINGUISHERS SHOULD BE PROVIDED FOR
EMERGENCY USE. ONE SHOULD BE AVAILABLE
ON TOP OF THE TRANSFORMER WHEN WORK IS
BEING DONE INSIDE THE TANK. NO SMOKING
SHOULD BE PERMITTED ON TOP OF THE TRANS­
FOfu\fER WHEN ANY COVERS ARE OPENED OR IN
THE VICINITY OF THE OIL HANDLING EQUIP·
MENT.
NOTE: IT SHOULD BE REALIZED THAT THE USE OF
A FIRE EXTINGUISHER INSIDE THE TRANS·
FORMER WILL USUALLY SEVERELY DAMAGE OR
RUIN THE TRANSFORMER INSULATION. C02 EX­
TINGUISHERS CAUSE THE LEAST DAMAGE.
BEFORE REMOVING ANY COVERS OR FITTINGS
FROM THE TRANSFORMER, MAKE CERTAIN THAT
THERE IS ZERO GAUGE PRESSURE IN THE TANK,
AND THE FLUID LEVEL IS NOT ABOVE THAT PAR·
TICULAR OPENING.
NEVER ALLOW ANYONE TO ENTER THE TRANS.
FORMER TANK UNLESS AN ANALYSIS OF THE AIR
IN THE TANK SHOWS AT LEAST 1 9.5% OXYGEN.
WHENEVER ANYONE IS IN THE TANK, A MAN
2 1
SHOULD BE STATIONED AT THE MANHOLE OUT·
SIDE THE TANK.
LIGHTS MUST BE EXPLOSION PROOF AND HAVE
OIL RESISTANT CORDS.
Avoiding Transformer Damage
Transformers are generally shipped sealed and ready for
energizing without opening the tank. In cases where it is
necessary to open the tank for changing terminal board
connections or installing high voltage bushings, extreme
care is required to protect the insulation from damage.
Internal parts are located to provide the necessary elec·
trical clearances and must not be bent or moved out of
position. All contaminating materials must be kept out
of the tank.
While the transformer is open no one should be per­
mitted on top of the t ransformer until he has emptied
all pockets, checked for loose objects elsewhere on his
person , such as in pants cuffs, and has removed watches
and rings.
Persons entering the transformer must not have loose
dirt particles on their clothing. Clean cloth shoe covers
or nitrile rubber overshoes must be worn by anyone enter­
ing the tank.
Never stand directly on any electrical insulation.
Clean drop cloths should be used under working areas
in the transformer to prevent objects from dropping into
the structure.
All tools must be accounted for. If possible , tools
should have lines attached so that they cannot be lost.
One person should be responsible for policing the
people and materials into and out of the tank and for
making certain that nothing is left in the tank accidentally.
This person should also be responsible for limiting the
length of time the tank is left open to
24
hours as speci­
fied in Sections 8.4 and 8.6 of this book.
In the event of sudden weather changes, threatening
rain or snow, provisions should be made for closing the
tank quickly to protect the insulation.
If any object is dropped into the transformer and can·
not be retrieve d, a Westinghouse representative must be
notified immediately.
Do not conduct vacuum operations when it is raining
or while the transformer is unattended.