TECHNICAL. Brochure CONTENTS INTRODUCTION 3 ELECTRICAL SPECIFICATIONS 4 TECHNICAL FEATURES 6 BUSHINGS 7 STANDARD PRODUCT 8 ACCESSORIES 10 TESTING 11

Transcription

1 TECHNICAL Brochure

2 TECHNICAL Brochure CONTENTS INTRODUCTION 3 ELECTRICAL SPECIFICATIONS 4 TECHNICAL FEATURES 6 BUSHINGS 7 STANDARD PRODUCT 8 ACCESSORIES 10 TESTING 11 PAINTING 12

3 INTRODUCTION United Transformers Electric Company (Utec) located in 2nd Industrial City, Riyadh KSA. Established in 2001 with the aim to produce Distribution transformers to meet the needs of public utilities in particular and private industrial sector in general, as well as export markets. Utec is a joint venture between Al- Fozan Group and Wilson Transformer Company (WTC), Australia. WTC is one of the largest transformer producer in Australia established in Utec products range: Distribution transformers, Oil filled (Hermetically Sealed & Conservator type) as per IEC standard from 25kVA to 3150kVA up to 36KV (HV) & 1,100V (LV). With state of the art technology, expertise, competency, production equipments & facilities, Utec has executed various contracts for Local / Export Markets. Since 2001, Utec has supplied thousands of Distribution Transformers in Local / Export Markets to various Utilities and private sectors. Our objective is to achieve customer satisfaction through timely compliance with customer demands & requirements. We strive constantly to exceed our customer expectations for quality, value, delivery and service.

4 TECHNICAL Brochure ELECTRICAL SPECIFICATIONS STANDARDS IEC and IEC SEC Specification No: 51 - SDMS, 56-SDMS, 51-TMSS (including latest revisions) CONSTRUCTION Corrugated or rigid tank, hermetically sealed with or without gas cushion. Immersed in mineral oil (IEC Class I) Natural cooling: ONAN (KNAN can be provided on request) WINDING Both HV and LV windings are made of copper (Aluminum on special request) High Voltage winding: Delta connected. Low Voltage winding: Star connected with neutral brought out. Connection Group: Dyn11 Other configurations like YNd11, Yzn11 etc can be provided. TEMPERATURE RISE LIMITS Maximum ambient temperature: 550C (standard 500C). Temperature rise of top oil: C (as per customer request) standard 450C Avg. Temperature rise of windings: C (as per customer request) standard 500C ELECTRICAL CHARACTERISTICS Frequency: 50 or 60 Hz High Voltage: Most used values: 13.8 kv or 33 kv Also available: dual-primary voltage kv, kv. Any voltage can be provided as per customer request. (Up to 36 kv class) Low Voltage (at no load): Most used values: 231 or 400 V We may supply any voltage required by our client. Tapping on HV side (by off-load tap changer): ±2.5% ±5% (we may also supply any tapping required by client). Short Circuit withstand time = 2 seconds. (5 sec shot on customer request) Impedance voltage: As per IEC or as per customer request.

5 State of the art design tools and Engineering capabilities enable Utec to fulfill most stringent requirements.

6 TECHNICAL Brochure TECHNICAL FEATURES STANDARDS Transformers are manufactured according to IEC in general and in particular as per concerned Utility / Client Specifications. CONSTRUCTION Tank construction can be of any type mentioned below. Hermetically Sealed without gas cushion Sealed with gas cushion Conservator type with breather Cooling with corrugated fin Cooling with radiator MAGNETIC CIRCUIT The magnetic circuit (Fig.1) is made of a high quality cold rolled, grain oriented silicon steel strips. Each strip is insulated from both sides by Carlite and is cut with an angle 450. Step lap and conventional mitered joint stacking is employed to reduce the no-load losses and the exciting current. WINDINGS Both the Low Voltage and High Voltage windings (Fig.2) are made of copper. (Aluminum winding can also be provided upon special request). The high Voltage winding is wound directly on the Low Voltage winding, with insulating paper and cooling duct, between the two windings. Most modern techniques are used to provide adequate short circuit strength. Fig.1 Fig.2 Magnetic Circuit Windings TAP CHANGER Tappings are provided on the HV windings (number and step according to client requirements) with standard values of ±2.5% & ±5%. The step change from one tapping to another is done by operating an offload tap changer. Padlock for tap changer handle can be provided. VOLTAGE SELECTOR For dual primary voltages (e.g , KV), the switching from one primary voltage to the other is done by a voltage selector. OIL TYPE Transformers are supplied filled with mineral oil according to IEC Class I. In addition Silicon or Midel oil can be provided on request. Fig.3 Tap changer / voltage selector handle ( lockable )

7 BUSHINGS High voltage bushings : DIN type, made of porcelain (Fig. 1, 2, 3) Plug-in type (Fig. 4) BS type (Fig. 5, 6) Low voltage bushings : DIN type, made of porcelain (Fig. 7, 8) Epoxy Bus bar type (Fig. 9) Mono block (Fig. 10) Fig1 Fig2 Fig3 Fig4 Fig5 Fig6 Fig7 Fig8 Fig9 Fig10

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10 TECHNICAL Brochure ACCESSORIES STANDARD ACCESSORIES Name plate & connection diagram (Fig.1) Earthing terminals on tank bottom (Fig.2) Oil filling plug Oil drain valve (Fig.3) Lifting lugs (Fig.4) Bi-directional rollers (Fig.5) Top oil thermometer with a maximum Indicator (Fig.6) (with or without contacts) Pressure relief device (Fig.7) (with or without contacts) Oil level indicator: Vertical float type (Fig.8) Dial type (Fig.9) Earthing terminal Fig.2 Oil darin Valve Fig.3 OPTIONAL Buchholz relay Silica gel Breather Winding temperature indicator with contacts DGPT2 multi-function protection relay (Fig.10) that detects and signals: (a)reduction of oil level (b)presence of gas (c)over temperature Fig.4 Lifting lug Fig.6 Top oil thermometer Fig.5 Adjustable roller Fig.7 Pressure relief device Oil level indicator: vertical float type Fig.8 Fig.1 Fig.10 Rating Plate Oil level indicator: dial type Fig.9 DGPT2 multi-function protection relay

11 TESTING On each manufactured transformer the following routine tests will be conducted, in accordance to IEC prior to final inspection and dispatch to customer. ROUTINE TESTING:- Measurement of the turns ratio and phase displacement. Measurement of Insulation resistance. Measurement of winding resistance. Separate source voltage withstand test. Induced over voltage withstand test. Measurement of no load loss and magnetizing current. Measurement of short circuit impedance and Load loss. Dielectric strength test of Insulating oil. Following type tests and special tests can be performed, as per the design/customer request, according to the related IEC standards. Type Tests:- Temperature Rise Test. (Internal). Lightning Impulse Test (King Saud University KSA or International Lab.) Utec transformers have been subjected to special test performed by KEMA-Netherland and King Saud University-KSA. Special Tests:- Sound Level Test. (Internal + External) Short Circuit Withstand Test. (International Laboratories)

12 TECHNICAL Brochure Painting system Transformers are coated with heavy duty specialized alkyd system having proven track record under gulf atmospheric services. Our standard painting system is applied through flooding process to ensure uniform application including hard to reach area. Also Epoxy poly urethane system can be applied as primer coat of Epoxy zinc phosphate and top coat of aliphatic polyurethane Enamel by air spray gun to cover the need of highly corrosive areas in accordance of BS EN ISO

13 GROUND MOUNTED TRANSFORMER RIGID TANK WITH RADIATOR 500 kva to 3150 kva RATED VOLTAGE 36 KV DESCRIPTION LIST 1- HV BUSHING 2- LV BUSHING POSITION OFF - CIRCUIT TAP SELECTOR 4- PRISMATIC OIL LEVEL INDICATOR 5- DIAL TYPE OIL THERMOMETER WITH 2 CONTACTS 6- PRESSURE RELIEF DEVICE WITH 2 CONTACTS 7- DRAIN VALVE WITH SEALING PLUG 8- RATING & DIAGRAM PLATE 9- UNIT LIFTING LUGS 10- EARTH LUG WITH M12 BOLT 11- SKID UNDER BASE 12- RADIATORS 13- LOGO PLATE 14- HV CABLE BOX 15- LV CABLE BOX 16- JACKING PADS 17- THERMOMETER POCKET 18- FILTER VALVE WITH SEALING PLUG GROUND MOUNTED TRANSFORMER With conservator & breather 100 kva to 3150 kva. Rated Voltage 36 KV DESCRIPTION LIST 1- HV Plug-in bushing 2- LV bushing 3-5 position off circuit tap selector 4- Dial type oil thermometer 5- Pressure relief device with sealing 6- Drain valve with sealing plug 7- Rating & diagram plate 8- Unit lifting lugs 9- Earth lug with m12 bolt 10- Base channel 11- Side cooling, flexible fins 12- End cooling, flexible fins 13- Logo plate 14- LV phase markers 15- HV phase markers 16- Trunking HV & LV removable 17- LV cable box 18- HV cable box 19- LV cable support 20- HV cable support 21- LV extension bus bar 22- LV bus bar support 23- Conservator tank 24- Prismatic oil level indicator 25- Double flanged ball valve 26- Silica gel breather 27- Conservator oil drain valve 28- Conservator filler stack with r1 plug 29- Buch holz relay

14 POLE MOUNTED TRANSFORMER WITH LV CABLE BOX, HV BUSHING TOP MOUNTED100 kva to 300 kva. RATED VOLTAGE 36 KV DESCRIPTION LIST 1- HV BUSHING 2- LV BUSHING POSITION OFF - CIRCUIT TAP SELECTOR 4- FILLER STACK WITH LEVEL INDICATOR 5- DIAL TYPE OIL TEMPERATURE THERMOMETER 6- PRESSURE RELIEF DEVICE 7- DRAIN VALVE WITH SEALING PLUG 8- LV CABLE BOX 9- RATING & DIAGRAM PLATE 10- LV CABLE SUPPORT 11- UNIT LIFTING LUGS 12- EARTH LUG WITH M10 BOLT (STAINLESS STEEL) 13- LV PHASE MARKERS (HV MARKERS ON LID) 14- ANGLE FEET WITH 2 SLOTS 17 x END COOLING, FLEXIBLE FINS 16- ARRESTER BRACKET 17- LOGO PLATE TRANSFORMER FOR PACKAGE SUBSTATION ALL ACCESSORIES ON FRONT SIDE100 kva to 1500 kva. RATED VOLTAGE 13.8 KV DESCRIPTION LIST 1- HV BUSHING 2- LV BUSHING POSITION OFF - CIRCUIT TAPSELECTOR 4- FILLER STACK WITH OIL LEVEL INDICATOR 5- DIAL TYPE OIL THERMOMETER 6- PRESSURE RELIEF DEVICE 7- DRAIN VALVE 8- RATING & DIAGRAM PLATE 9- UNIT LIFTING LUGS 10- EARTH LUG WITH M12 BOLT 11- BASE CHANNEL WITH TWO SLOTS 17 x SIDE COOLING, FLEXIBLE FINS 13- LOGO PLATE 14- END COOLING, FLEXIBLE FINS 15- FLANGE LV BUSHING 16- FLANGE HV BUSHING 17- LV & HV PHASE MARKERS

15 GROUND MOUNTED TRANSFORMER GROUND MOUNTED TRANSFORMER GROUND MOUNTED TRANSFORMER POLE MOUNTED TRANSFORMER

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