TECHNICAL
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TECHNICAL
Brochure
CONTENTS
INTRODUCTION
3
ELECTRICAL SPECIFICATIONS
4
TECHNICAL FEATURES
6
BUSHINGS
7
STANDARD PRODUCT
8
ACCESSORIES
10
TESTING
11
PAINTING
12
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 1933.
Utec products range:
Distribution transformers, Oil filled (Hermetically Sealed & Conservator type) as
per IEC 60076 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.
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ELECTRICAL SPECIFICATIONS
STANDARDS
IEC 60076 and IEC 60354
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 (IEC60296 - 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: 40 - 60 0C (as per customer request) standard 450C
Avg. Temperature rise of windings: 45 - 650C (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 13.8 – 11 kV, 11 – 6.6 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 60076 - 5 or as per customer request.
State of the art design tools and Engineering capabilities enable Utec to fulfill most
stringent requirements .
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TECHNICAL FEATURES
STANDARDS
Transformers are manufactured according to IEC 60076
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
Fig.1
Magnetic Circuit
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.2
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. 13.8 - 11, 11- 6.6 KV), the switching
from one primary voltage to the other is done by a voltage selector.
Fig.3
OIL TYPE
Transformers are supplied filled with mineral oil according to
IEC 60296 - Class I. In addition Silicon or Midel oil can be provided
on request.
Tap changer / voltage selector
handle ( lockable )
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
F
Fig2
2
Fig6
Fig5
Fig9
Fig3
Fig4
Fig8
g8
Fig7
Fig10
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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)
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.3
Fig.2
Oil darin Valve
Earthing terminal
Fig.5
Fi
i
Fig.4
Adjustable roller
Lifting lug
Fig.7
Pressure relief device
Fig.6
Top oil thermometer
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
TESTING
On each manufactured transformer the following routine tests will be conducted, in accordance to IEC 60076 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)
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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 12944.
GROUND MOUNTED TRANSFORMER
RIGID TANK WITH RADIATOR 500 kVA to 3150 kVA RATED VOLTAGE ≤ 36 KV
DESCRIPTION LIST
1- HV BUSHING
2- LV BUSHING
3- 5 - 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 M O U N T E D T R A N S F O R M E R
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
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
3- 5 - 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 120
15- 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 K V
DESCRIPTION LIST
1- HV BUSHING
2- LV BUSHING
3- 5 - 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 40
12- 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
GROUND MOUNTED TRANSFORMER
GROUND MOUNTED TRANSFORMER
GROUND MOUNTED TRANSFORMER
POLE MOUNTED TRANSFORMER
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