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INSTRUCTION BOOK PS-1002

FOR POWER SUB STATION

TRANSFORMERS

Westinghouse Electric Corporation

Small Power Transformer Division

South Boston, Virginia

24592

All  possible  contingencies  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.

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Summary of Contents for PS-1002

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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 ...

Page 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 ...

Page 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...

Page 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 ...

Page 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...

Page 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 ...

Page 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 ...

Page 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 ...

Page 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...

Page 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 ...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 35: ...MEMORANDUM ...

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

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