www. ElectricalPartManuals. com r" n;;-==- Westinghouse Ventilated Dry Type Transpac Power Centers Page 1 Descriptive Bulletin
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1 Westinghouse Application Transpac power centers are for applications where space availability is critical and thus the power center must be put into special locations such as against the wall, in closets. under stairways and even in some cases they can be put in a wall with a front flush mounting panel. They are available for shipment and installation in one piece or in the case of the HV design they can be shipped in several sections. Benefits Safety and Versatility Takes less space as these units can be put against the wall or in some cases in the wall. Air insulated and cooled by natural convection. these transformers release no toxic gases and cannot explode. Elimination of these principal liquidfilled transformers potential hazards makes them especially desirable for installation in schools. hospitals. hotels. theatres. factories. etc.. where large groups of people are present. Fire proof--no combustible materials used. Minimum maintenance-only periodic cleaning necessary-no liquid handling facilities required. Proven short circuit capabilities--test results of full size 1500 KVA transformer avai lable. Proven surge capabilities--impulse test results available. low Voltage 600 Volt Transpac with High Voltage and low Voltage Panelboards r" n;;-==-,.. '" Shown with flush wall mounting bracket \ \ Descriptive Bulletin KVand below High Voltage Transpac 5to15Kv o Snown with HV fusable switch. LV panelboard in a closet with back aga i nst the wa Page 1 -
2 Descriptive Bulletin Page 2 Westinghouse High Voltage 5-15 KV Features Front accessibility only availablesides and rear can be put against a wall. etc. Minimum floor space-with front accessibility a 12" space in the rear and extra space along the sides is not requ ired for venti lation. Lowest installation cost--power center can be shipped in one piece completely wired and connected. Ratings 75.3 Phase to 1500 KVA AA 2.5 KV Class to 15 KV Class Bil ratings-25 KV Bil for 5 KV Class 35 KV Bil for 8.7 KV Class 50 KV and 95 KV Bil for 15 KV Class Typical Arrangements 150 C rise-115 C riseq)-80 C riseq) 6-Y.6-6 or Y-Y connections available Q) 115 degree C and 80 degree C rise plus 95 KV Bil will increase weight and dimensions of Transpac Power Center. Accessories low Voltage Panelboard with Metering and Switchgear Sections Attached This type of Transpac can be provided with a HV load break switch as shown. a terminal compartment. oil fused cutouts and a lv lighting or distribution panelboard. a panelboard with other switchgear lineups. and a metering compartment. The are available for shipment and installation in one piece to reduce the installation time and costs or it can be shipped in several sections if required to move the low Voltage Panelboard with Metering power center in tight locations or around narrow corners prior to installation. A common base is available for moving switch and transformer in one piece. This adds 4" to height. Dimensions: 750 KVA & Below HV Volts 82" wide 75" high 35Ya" deep HV Volts 86" wide 75" high 40" deep Note: Dimensions are with LBF switch. Case width is reduced 6" with LB-600 switch (lb-600 switch handle on side projects 4" from the case). -- (0 Voltmeter 0 Ammeter e Watthour Meter
3 High Voltage Transpac Design and Construction Descriptive Bulletin KV and below Page 3
4 Descriptive Bulletin Page 4 Westinghouse The core and coil assembly of every Westinghouse dry type transformer is ruggedly constructed to withstand shock and vibration-whether during shipment. motor starting. line faults. or multiple short circuits. Each unit is subjected to a computer simulated short circuit to calculate short circuit forces. Coils therefore are designed with the inherent strength to resist a forces generated during faults. This process virtually eliminates the possibility of short circuit failure. n fact. there has been no known instance of short-circuit failure in dry type Westinghouse core and coil assemblies since Core and coil structure forms a compact. rigidly braced unit. The coils. wound concentrically around the core legs. are firmly positioned laterally between the innermost insulating cylinder and the core. Core Core material is non-aging. highly permeable. cold-rolled silicon steel. Specially hardened and ground tools are used for cutting bulk material to width and shearing it to length. These special cutters not only prevent edge damage. they also eliminate burrs that could short between laminations and thus reduce core efficiency. Coils Standard conductor material for both low and high voltage windings is aluminum (used by Westinghouse in dry type transformers and air core reactors since 1952). Perfected over the last twenty years. Westinghouse joining methods and wind ing techniques have proven completely reliable in the thousands of units now in service. High voltage coils are wound directly over the low voltage coils. forming a rigid structure that can easily withstand the hammering of multiple short circuits. Optimized computer design programs are used by Westinghouse to eliminate design errors. Voltage stress calculations for each coil verify the ability of that coil to meet the BL requirements. thereby eliminating the need to impulse test each unit --a $300 to $400 savings. The multivariable iterative optimization process. while providing a 5 to 10 % reduction in size and weights. also determines the most economical and reliable design to meet all individual customer requirements. Voltage requirements determine the type of coils to be used. Low voltage coils in the 1.2 KV class are sheet wound. while those in the 5 KV class are barrel/ cylindrical windings. High voltage coils are either pancake/random wound (15 KV class) or barrel/cylindrical (5 KVClass). Tap Terminal Board The taps can be reached from the front or back by removing a panel which also protects the taps from tampering. The taps are rigidly supported on a terminal board. centrally located on the coils. Taps are changed by moving the terminal strips from one connecting point to the other. To simplify these changes. the con nections are clearly identified.
5 nsulation Percent of Winding to Ground For superior strength and durability at sustained elevated temperatures, coil windings are insulated by du Pont Nomex class H insulation and protected by Doryl high-temperature varnish. Tough. long-life Nomex is especially resistant to humidity and thermal cycling. Doryl. as shown in Figure 2 and 3, combines superior bond strength and high dielectric strength with good performance at high temperatures. These materials allow Westinghouse to offer a true 220 C insulation system. fully 40 C more than the commonly used insulations. Standard Westinghouse 150 C rise units are designed to be operated (in a 40 C ambient temperature), at full load continuously-24 hours a day, 365 days a year-for twenty years. Our experienced mean time between failure rate of 2.27 x 106 assures uninterrupted service for many years. n addition to the Nomex conductor and layer insulation, Westinghouse dry type transformers have large air ducts that provide insulation between windings. The ducts form vertical cylinders for natural ventilation, thus reducing heat build-up. Westinghouse insulation structures are both flame retardant and self-extinguishing, for increased safety and lower repair costs in case of fire. Flame retardant testing is performed under ASTMD635. Figure 2 20 o Figure 1 Descriptive Bu letin KVand below These curves depict voltage build-up on the line ends of the various types of coils (during a voltage surge). The straight line indicates completely even voltage distribution throughout the coil-in other words. no voltage build-up. The barrel/cylindrical coil has a high voltage build-up during surges However, this type of winding is perfectly reliable for the 5 KV class and below. Westinghouse barrel/cylindrical windings are designed to withstand KV impulses. Solvent Resistance Cured Doryl vs Cured Silicone _ Doryl Figure 3 _ Silicone As shown below. both 115 C and 80 C units are also available, for added KVA capacity on a taps: nsulation System 220 C 220 C 220 C Ambient Temperature Maximum Temperature Rise 40 C 150 C 40 C 115 C 40 C 80 C Page 5 Hottest Spot KVA Capacity Winding at 150 C Temperature Rise Rise 180 C 100% 145 C 115% 110 C 135%
6 Descriptive Bulletin Page 6 Westinghouse low Voltage (transformer mounted above panelboard [s 1) 600 Volt Class KVA
7 Low Voltage Transpac Power Center ( transformer mounted behind panelboard) 600 Volt Class KVA 4 2 Descriptive Bulletin KV and below Page 7
8 Descriptive Bulletin KV and below Tvpical Specification for Page 8 Furnish a ventilated dry type (HV) (LV) Transpac Power Center Westinghouse or equivalent for front accessibility. The panelboard(s) shall be mounted in the front of the transformer. The sides and rear of the power center shall be designed to fit against a wall or other equipment. (On LV Transpacs, a front flush mounting bracket can be provided if required for mounting unit in a wall). HV Transpac Power Centers shall be shipped (in one piece completely wired and connected) (in several sections). LV Transpac Power Centers shall be shipped in one piece. High Voltage Switch (for 5-15 KV High Voltage ) The HV switch shall be a gang operated 3 pole, 2 position air-insulated load interrupter switch. The switch compartment shall have a sight window for visual inspection of switch contacts. The switch handle sha be operable from the front of the unit. The HV switch shall be manually operated and rated at 600 amps continuous, load break and load closing. The switch mechanism shall provide quick closing and opening. Switch shall be cable connected to the transformer terminals to prevent transmission of sound to the switch. The switch case shall be made of a minimum of 11 gauge steel. All incoming cables shall be for front connection and the switch shall be for front accessibility only. Optional Equipment Available with High Voltage Switch Fuses (Three CLE-current limiting E) (three-rba (boric acid)-(200) (400) fuses or approved equa a re to be provided on the load side of the HV switch in a separate section of the HV switch compartment. The hinged access door to the fuses sha be interlocked with the switch so that the door cannot be opened until the switch is in the open position. Also the switch cannot be closed until the fuse access door is closed. The fuses shall have a continuous rating to protect transformer. Spare Fuses Three spare fuses are to be supplied. Transformer The transformer shall be an open ventilated dry type when operated at a continuous full load rating of KVA shall not exceed a 150 degree C. average Westinghouse Electric Corporation Sharon Transformer Division, Sharon, Pa, Printed in USA rise by resistance and a 180 degree C. hot spot rise in a 40 degree C. ambient. Transformer will be (1/3) phase 60 hertz. The HV shall bel rated volts connected (delta) (wye)-bl* with 2-2%% full capacity taps above normal voltage and 2-2 '10 % full capacity taps below normal voltage. The LV shall be rated nected (delta) (wye) wire. *BL levels of coils. volts con 15 KV class 50 KV BL optional; 95 KV BL 8.67 KV Class 35 KV BL 5 KV Class 25 KV BL 1.2 KVClassl0KVBL BL * (3) (4) (HV taps on HV Transpacs shall be changed from tap changers) (HV taps on LV Transpacs shall be coil face taps) for changing whi e transformer is deenergized and accessible through removable panel (s) on the front. The coils shall be wound with aluminum or copper. This conductor shall be insulated with 220 degree C class H materials consisting of glass or Nomex, 15 KV HV coils shall be continuous pancake or wire wound construction using strap or wire conductor. Barrel/cylindrical windings shall be provided below 15 KV. The LV coils shall be the barrel/cylindrical or sheet wound construction. All materials used in the transformer will be flame retardant and will not support combustion as defined in ASTM Standard Test Method D635. A full 220 degree C insulation system shall be provided. This insulation system shall be functionally evaluated by.e.e.e.- 65 and/or 259. The KVA rating is to be available continuously in a 40 degree C ambient with normal life expectancy as stated in.e.e.e.-65. Panel boards The sound level shall be guaranteed not to exceed db at the self-cooled rating\]). Standard N EMA guaranteed sound levels are: (W average sound level is 4 db below these figures). \]) KVA 58 db KVA 60 bd KVA 62 db KVA 64 db KVA 65 db KVA 66 db KVA 68 db The transformer structure shall be capable of withstanding short circuit tests as defined in NEMA TR-27 without mechanical degradation of the insulation structure and shall be proven by the results of full scale testing. Routine tests shall be made on all transformers as specified in ANS standard C Transpac Optional Features Available with High Voltage Transformer Forced-Air Transformer shall be provided with forced-air equipment to increase the capacity to a minimum of 33-1 /3% above the self-cooled rating, This equipment shall include the fans mounted on the transformer core and coil, the fan control which includes visual alarm indication, wiring, and a simulated winding temperature indicator and relay in one phase of the transformer with 3 alarm contacts. An ala rm contact Shall turn the fans on Just prior to reaching the self-cooled KVA rating. The control for the fans shall include a circuit breaker or fuse for protection of the fan equipment, 3 lights indicating normal temperature, fans on and exces sive temperature. Also the control shall include a switch for manually running the fans or testing them and an alarm reset switch. Panelboards shall be the (lighting) (distribution) type rated amperes (3) (4) wire for front accessibility. The panelboards shall consist of molded case circuit breakers as shown (below) (on the drawings) which will be manually operated with thermal-magnetic overcurrent protection. Quantity Frame Pole Further nformation Size Prices: Price List Dimensions: Dimension Sheets Trip Rating (Amps.). nterrupting Rating (Amps.) The Westinghouse policy of continuous improvement of its products may result in changes of these specifications without notice.
Proven Surge Capabilities-Hisercap Design Tests Available
Westinghouse Features Maximum Salety Minimum Maintenance Transformer Cannot Explode Ventilated-Not Sealed Vessel Fire-Prool-No Combustible Materials Ecology Designed-No Contaminating Emissions Proven Short
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