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2. 

Make  the  Field Tests of the  Sudden Pressure Relay  and 

its  Panel  to  determine  whether  the Relay  is  in proper op­

erating  condition.  Refer  to  Instruction Leaflet 

48-065-1. 

3. 

Make  insulation power  factor  and insulation resistance 

tests and check the  Transformer Turns Ratio. 

4. 

Remove the manhole cover for observation.  Sometimes 

the odor of burning is obvious. 

5. 

Make  any  other  tests  which  may  be  suggested  by  the 

results of the above checks. 

After  the  condition  of  the  transformer and Relay have 

been  checked,  and  if  no  damage has been found, it is nec­
essary to decide whether the breaker should be reclosed to 
put  the  transformer  back into service. The risk of possible 
further  internal  damage  must  be balanced against the pos­
sibility that  there is no serious internal damage. 

5 .11  Transformer Coo

lin

g Fans 

In  order  to provide  for  greater  transformer loads without 

overheating  the windings,  a  set of fans will be clamped to 

the  top or to the sides of the transformer cooler assembly. 

Fan  control  will  be  automatic  from  either  the  liquid 

temperature  gauge,  the  winding  temperature  gauge,  or  a 

thermal  relay  (when  furnished),  in  parallel  with  a 

"MANUAL-AUTO"  control  switch  in  the  control  cabi­

net. 

A 

starter contactor is used when fan capacity exceeds 

the  alarm  switch  duty  rating.  When  a  starter  contactor  is 
required,  a forced air control  panel is supplied.  TI1e forced 

air  control  panel is located in a weatherproof cabinet nor­
mally  attached  to  the  tank  wall.  Automatic control con­
sists  of  a  De-ion®  type 

AB 

line  breaker,  a  contactor,  a 

"manual-auto"  switch  and  additional  terminals  for  alarm 

or  lamp  indication.  For  manual  control  only  the 

AB 

breaker is supplied. 

The  thermal  trip 

AB 

breaker provides short circuit pro­

tection  and  a  means  of  de-energizing the panel for inspec­

tion and for maintenance. 

A 

thermally-actuated switch included in the liquid tem­

perature  gauge  or  the  winding temperature gauge controls 
the  solenoid of  a  magnetic  contactor  which  in turn starts 
and stops  the  fan  motors in response to a  change in liquid 
or winding temperature. 

The  circuit  is  energized  from the load side of the panel 

power  circuit.  The  "manual-auto"  switch  provides  a 

11 

means  of  starting  the  fans  independently  of  the  position 

of  the  thermal  switch.  With  the  thermal  switch  in  the 
closed  position,  the  fans  may  be  stopped  by  opening  the 

AB 

breaker. 

An 

''Auto-Off-Manual"  switch  is supplied in­

stead of the  "Manual-Auto'' switch when requested by the 
customer. 

Fan  motors  come  equipped  with  drain  plugs  on  the 

housing  to  prevent  collection  of  condensate  inside  the 
motor.  WHEN INSTALLING THE  FANS IN  THE  FIELD, 

IT  IS  IMPORTANT TO PERMANENTLY REMOVE THE 

BOTTOM DRAIN PLUG. 

Fan  motors  are  single-phase, 

50-60 

Hertz, 

1/6 

hp,  ca­

pacitor  start  and capacitor  run.  Rotation  of the fan blade 

is  counter-clockwise  when  looking  at  the  motor  from  the 
lead  end.  The  motors  will  operate  between 

208 

and 

240 

v.a.c.  The  fan  motors  have  permanently  sealed  ball  bear­
ings  that  require  no maintenance.  When  replacing motors 
it  is  recommended that  the  capacitor  also  be replaced. 

A 

bad  capacitor  will  cause  the  motor  to  draw excessive  cur­
rent and fail  due to overheating. 

FAN  BLADES  ARE  SHARP  AND  CAN  CAUSE  PER­
SONAL 

INJURY. 

ALWAYS  DE-ENERGIZE  THE 

TRANSFORMER  AND  THE  FAN  CIRCUIT  WHEN 

DOING  MAINTENANCE  ON  OR  INSTALLING COOL­
ING  FANS.  NEVER  REACH INSIDE THE FAN G UARD 

OR FAN CAGE. 

5.12  Tap Changer 

The  tap  changer  provides  a  means of changing the voltage 
ratio  of  a  de-energized  transformer  without  breaking  the 
transformer  seal.  It  is  operated  by  means  of  a  rotatable 

handle  located  on  the  side  wall  or  cover  of  transformer. 

This  handle  is  attached  to  the  tap  changer  by  means  of a 
shaft  which  extends through the liquid and gas tight pack­
ing  gland  in  the  tank.  The  tap  changer  is  normally  pro· 
vided  with five  positions,  as  indicated  on  the  tap changer 
dial plate and transformer instruction nameplate. 

One  tap  position  change  requires  one complete revolu­

tion  of  the  external  operating  handle.  The  transformer 
must  not  be  energized  unless  the  tap  changer  is locked in 
an operating  position. 

A 

locking  pin  holds  the tap  changer  handle  in any  of 

the  tap  positions.  By  pulling  this  pin outward, the handle 
is  allowed  to  move  freely  to  the  position  desired.  The 
locking  pin  can  only  be reset in the indexed boss. This as-

Содержание PS-1002

Страница 1: ...gencies which may arise during installation operation or maintenance and all details and varia ions of this equipment do not purport to be covered by these instructions If further information is desired by purchaser regarding his particular installation operation or maintenance of his equipment the local Westighouse Electric Corporation representative should be contacted ...

Страница 2: ...ove 25 Kv class 13 5 13 3 Wall Mounted Bushings 2 5 Kv 25 Kv class 17 5 14 Lightning Arresters 18 5 15 Current Transformers 20 5 16 Inertaire 20 5 17 Radiators 20 6 INSTALLATION 21 6 1 Precautions 21 6 2 Location and Mounting 22 6 3 Assembly 22 6 4 Filling in the Field 22 6 5 Air Terminal Chamber and Switchgear Adapter Installation 22 6 6 Preparation for Energization 23 7 OPERATION 24 7 I Basic Tr...

Страница 3: ...cement is recommended rather than repair If information is desired in greater detail copies of in struction leaflets referred to but not included with this book can be obtained by contacting your Westinghouse Sales Office 2 RECEIVING NOTE INSPECTION OF TRANSFORMER PACK AGES AND PARTS IS REQUIRED PRIOR TO UN WADING FROM CARRIER IN ORDER TO ESTAB LISH THE CONDITION OF THE EQUIPMENT UPON DELIVERY 2 1...

Страница 4: ...plug a thread at a time until the pressure starts to relieve itself I CAUTION I The fdling plug can be blown off if the plug is removed from a pressurized transformer too quickly Personnel could be injured by the plug Oil or oil vapor could be expeUed creating a fire hazard b Ventilate the gas space with dry air to purge it of the nitrogen gas that it contains Refer to Section 8 6 ltM dbWil TO AVO...

Страница 5: ...ovided on the transformer tank wall Only these hooks can be used in lifting the complete transformer Refer to the outline for the proper lifting hook locations All four lifting hooks must be used for proper handling CAUTION Lifting the transformer in places other than the tank wall lifting hooks may result in damage to the transformer causing oil leaks It may also result in the dropping of the tra...

Страница 6: ...replace the bags and the silica gel before storing Type 0 bushings must be stored with the top end elevated at an angle of at least 20 from the horizontal above the bottom end A check of oil height and of power factor and capacitance should be made before putting an oil filled condenser bushing into service after prolonged stor age Refer to Westinghouse Bushing Manual T D 33 360 for instructions o...

Страница 7: ...IRAISFORIER IS DESIGNED FOR OPERl IOI BEIIEEI PRESSURE LilliS OF 6 5 LBS PER SOUlRE IICH POSIIIIE U0 1 5 LBS PER SQUIRE IICI IEGliiiE Fig l Typical Nameplate THIS IRINSfORMER Will CIRRY7000 m WITHOUT EXCEEDING 65 C AVERAGE IEMPERITURE RISE IHEN IOEOUIIE COOLING EQUIPMENT IS IOOEO THE 15 C LIOUIO lEVEl IS I 0 00 INCHES BElOW TOP OF HIGHEST MANHOlE flANGE LIOUIO lEVEl CHANGES 0 50 INCHES FOR EACH 10...

Страница 8: ...tch position and of inter nal terminal boards when present 13 NOTES AND WARNINGS The notes below the connection chart contain important information for use in operation and maintenance Read the notes because spe cial features or warnings will be in the nameplate notes 14 PHASE RELATION The phase rotation and phase angle shift between the high voltage and low voltage is represented by a phasor diag...

Страница 9: ...out appreciably helping the transfer of heat from the oil to the sensitive element The thermom eter should not be tightened in the well any more than is necessary to place the dial in an upright position Fig 3 Front and Side View ofIndicator with Alarm Contacts 7 The thermometer can be furnished with a Single pole single throw contact for fan starting and a Single pole double throw contact for hig...

Страница 10: ...re normally fur nished with a mechanical pressure relief device on the Fig 4 ReliefDel ice in Sealed Position transformer cover The device consists of a self resetting spring loaded diaphragm and a mechanical operation in dicator semaphore Should the tank pressure increase above 10 psig the gas pressure will lift the diaphragm and vent the excess pressure Immediately after the pressure returns to ...

Страница 11: ...uge A red pointer is furnished to show the highest tern perature attained since last reset and is resettable by means of a push button projecting through the bottom of thedial bezel The gauge has four single pole normally open con tacts with normal settings of 70 75 112 and 117 C 9 Fig 5 Front View of Winding Temperature Gauge Should it become necessary to adjust any of these con tacts from the ab...

Страница 12: ... relay may fail when vacuum is pulled on the transformer A seal in relay reset switch and the associated circuitry are mounted in a separate control cabinet The seal in re lay is energized when the sudden pressure micro switch operates and remains so until manually reset with the re set switch Seal in relay loads should be limited to the values given in the table listing given on the wiring dia gr...

Страница 13: ...ng temperature The circuit is energized from the load side of the panel power circuit The manual auto switch provides a 11 means of starting the fans independently of the position of the thermal switch With the thermal switch in the closed position the fans may be stopped by opening the AB breaker An Auto Off Manual switch is supplied in stead of the Manual Auto switch when requested by the custom...

Страница 14: ...re used See Fig 9 DRAW LEAD TERMINAL TERMINAL CAP i ifl g ffLING SILICONE RUBBER L GASKET Fig 9 Typical Cross Section of RJ Draw Lead Bushing installation of RJ Draw Lead Connection The terminal which is crimped to the draw lead has a steel pin pressed through a hole in the terminal diameter below the threads About 1 4 inch of pin extends on both sides of the terminal to engage a slot inside the p...

Страница 15: ...ed for voltage classes of 34 5 KV and above Westinghouse bushing Types RCP OS and 0 are normally supplied Each bush ing consists principally of a cylindrical condenser assem bly protected on its outer end with a porcelain weather casing made by the wet process The space between the condenser and the weather casing is filled with a high di electric strength compound or WEMCO C transformer oil depen...

Страница 16: ...INS EXPANSION BOWL FLANGE VALVE SEALING GASKET GASKET STOP FLANGE BOTTOM PORCELAIN TERMINAL CAP RETAINING GASKET rr MAGNETIC GAUGE GASKET AND STOP PORCELAIN __ TOP PART OF OIL CHAMBER OIL IMPREGNATED KRAFT PAPER CONDENSER WITH METAL FOILS SCREW CAN BE REMO VED TO REPLACE GAUGE GLASS OR DIAL VOL TAGE TAP RECEPTACLE NAMEPLAT E SEALING GASKET AND GASKET STOP BOTTOM PART OF OIL CHAMBER BOTTOM TERMINAL...

Страница 17: ... CAST RESIN CONDENSER CONFINED GASKET ___ _r ON COVER BOSS NOTE CONDENSER DETAILS OMITTED IN SECT IONED AREAS FOR CLARITY PURPOSES MINIMUM OIL LEVEL LEAD COVERED WITH TAPE I 12 THREADED STUD A Bushing with Draw Through Cable Lead B Bushing with Threaded End Conductor Fig 12 Outdoor Condenser Bushings Type RCP 15 ...

Страница 18: ... other sharp objects that could damage the con denser When cleaning the condenser use a clean cloth saturated with transformer oil It is recommended that condenser bushings which have been removed for shipment have the power factor and capacitance measured before they are installed in the transformer to find if internal shipping damage has oc curred This may avoid expensive disassembly from the tr...

Страница 19: ...ectors must not impose strains on the bush ing in excess of those specified by Table 8 ANSI Standard C76 2 1 977 Limit the cantilever load to 100 pounds on type RCP type RJ IS KV and below and all cast resin and cast resin welded bushings Greater force may cause bushing damage that can result in violent trans former failure 1 7 5 13 3 Wall Mounted Bushings 2 5 K V 25 K V Class Fig 14 Cast Resin Bu...

Страница 20: ...ible connections to the air or liquid ends of the bushing conductor in order to limit the thermal ex pansion forces on the bushing As a general rule a maxi mum cantilever or axial load of 1 00 pounds acting at the end of the bushing conductor should not be exceeded For detailed instructions on application installation or replacement request Instruction Leaflet 47 OS 1 1 for the weld on version or ...

Страница 21: ... BODY 0 0 NO N MAG N ET I C BUSH I NG P LAT E I NTEG RAL PART OF X FO R M E R TAN K S I L I CO N E 0 R I NGS 0 0 0 0 LI QU I D S I D E Non M agnetic B ushing Plate I ntegral Part 0 0 Cast Epoxy Body Aluminum Clamping Flange of X Former Tank R eta ined Cork Buna N or N itrile Gasket Stai n less Steel F lange Sil icone 0 R i ngs 0 0 0 0 Liquid Side 19 ...

Страница 22: ...rmer is shipped CURRENT TRANSFORMER SECONDARY LEADS MUST BE CONNECTED TO A LOAD OR SHORT CIR CUITED WHEN THE TRANSFORMER IS ENERGIZED IF THE SECONDARY LEADS ARE OPEN EX TREMELY HIGH PEAKS OR PULSES OF VOLTAGE ARE PRESENT AT THE SECONDARY TERMINALS THESE HIGH PEAKS OF VOLTAGE MAY NOT REG ISTER ON CONVENTIONAL VOLTMETERS BUT THEY CAN BREAK DOWN INSULATION AND ARE DANGEROUS TO PERSONNEL 5 1 6 Inertai...

Страница 23: ...iding 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 ...

Страница 24: ...efore removing manhole bolts Internal pressure can blow the manhole cover off injuring person nel If possible fill transformers shipped in dry gas with fluid before opening the tank When the transformer can not be filled with fluid before the tank is opened limit the total open time to 24 hours Refer to Sections 8 4 through 8 6 for instructions on liquid filling and ventila tion of transformer tan...

Страница 25: ...tings for leaks A leak above the liquid level can be located by applying a soap solution to all joints pipe fit tings and cable connections The transformer must be de energized when checked by this method When the pressure test is complete reduce the internal pressure 2 Insulating Liquid Test Before energizing the transfom1er the liquid must be tested in accordance with Section 8 I The dielectric ...

Страница 26: ...ON THE POWER FACTOR TEST TER MINAL THE TERMINAL MAY FLASHOVER LIFE COULD BE IN DANGER 7 Make a physical examination of control circuit wiring and alarm devices Look for cut or broken insulation and open connections 8 Liquid level should be at the correct level according to Section 5 4 Table 2 9 Refinish all paint scratches See Section 8 8 10 Tighten all external bolts and hardware Check handholes ...

Страница 27: ...rature of the air for any 24 hour period should not exceed 30 C 86 F The dial thermometer should read less than the sum of the maximum ambient temperature and the rated temperature rise during normal operation That is the maximum top liquid temperature for a 5 5 C rise transformer is 95 C and 1 05 C for a 65 C rise transformer The transformer s useful life will be short ened if the transformer is ...

Страница 28: ...move a bolted hand hole runs the risk of being hit by the cover if the internal pressure is not vented first 3 Oil filled transformers present a fire h azard to the in stallation area All liquid leaks must be repaired imme diately because transformer liquid is very flammable 4 Should an internal arc occur in the unit the internal pressure will increase and may increase so rapidly that the tank may...

Страница 29: ...airly represents the liquid in the tank A sufficient amount of liquid should therefore be drawn off before the sample is taken to insure that the sample will not be that which is stored in the sampling pipe If the sample taken contains free water it is not suitable for dielectric tests and the sample should be discarded A second sample should then be taken after at least two quarts of liquid have ...

Страница 30: ...perations specified in the following are intended to be accomplished as contin uous uninterrupted processes Insulation Resistance Temperature Correction Transformer Correc Transformer Correc Tempera tion Tempera tion ture C Factor ture C Factor 9 5 8 9 0 3 5 2 5 9 0 6 6 0 3 0 1 8 8 5 4 9 0 2 5 1 3 8 0 3 6 2 2 0 1 0 7 5 26 8 1 5 0 7 3 7 0 2 0 0 10 0 5 4 6 5 14 8 5 0 4 0 6 0 1 1 0 0 0 3 0 5 5 8 1 5 ...

Страница 31: ...ngs Drain any liquid which was not drained before repairs were made Apply the required vacuum level prior to fill ing and hold it for the specified time according to Table 4 If the time the core and coil assembly is out of liquid be fore evacuation for refilling is started does not exceed 16 hours liquid flow into the tank may start as soon as the required vacuum is obtained Then admit liquid into...

Страница 32: ... conserve dry air place a light cover of ply wood hardboard or plastic over the manhole opening The work should be performed in a sequence such that when accessories such as bushings are being installed only one opening other than the manhole will be open at any time Dry Air and Nitrogen When nitrogen is called for the nitrogen used should have a dewpoint not higher than 50 C 58 F and total impuri...

Страница 33: ...1 leaflets may be obtained through the nearest Westing house Sales Office Removing and Replacing Welded On Covers I L 47 600 2 1 Instructions for Repairing Tank Leaks l L 48 069 20 Cleaning Transformer Insulation LL 48 069 13 9 REPAIR 9 1 It is the responsibility of the owner to inspect main tain and keep the transformer in good repair 9 2 Report all failures during the warrantee period to your We...

Страница 34: ...2 or Instructions for Han dling WEMCO FR Insulating Oil LB 47 053 l I CAUTION I When working inside a transformer tank extreme care must be exercised to avoid dropping tools or other objects into the core and coils or into the tank Objects dropped on the coils or left in the tank can cause a fai lure to the transformer 9 10 The core and coil assembly can be repaired or re placed by Westinghouse pe...

Страница 35: ...MEMORANDUM ...

Страница 36: ...PS 1 002 479 979 Supercedes PS 1 001 1 076 Printed in U S A ...

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