Key Product Features

Enclosed Configuration
This configuration boasts two separate compartments, one dedicated to the distribution transformer and the other to the LV equipment. The flexible enclosed-type design accommodates single or double roof systems, allowing hassle-free equipment replacement
Exposed Configuration
This configuration is a testament to versatility and efficiency, featuring an exposed transformer paired with an outdoor LV switchboard on a shared skid base. The exposed-type USS configuration uniquely features oil-filled transformers, presented openly w

Proven Performance

Enhanced Safety and Aesthetics

The USS is strategically engineered to uphold stringent personal safety standards, making it a perfect fit for deployment in high-density urban centers. Its sleek design doesn’t compromise on aesthetics, seamlessly blending into its surroundings.

All-Encompassing Enclosure

With an innate focus on safeguarding equipment against environmental hazards and unauthorized access, the USS is encapsulated within a self-supporting enclosure. This protective shield ensures optimal functionality and longevity.

Cooling and Ventilation

Natural ventilation channels enhance the cooling efficiency of the electrical components, promoting optimal performance. For more demanding environments, optional forced ventilation is available.

Intelligent Door Design

Designed with operational ease in mind, the USS doors incorporate a door stopper to maintain an open position during maintenance. Standard 3-point locking is complemented by custom variants, ensuring security without compromise.

Seamlessly Integrated Connectivity

The USS ensures seamless connectivity. The distribution transformer’s MV side connection is established through pre-molded, heat shrink, or cold shrink cable heads. The LV switchboard is connected through a meticulously sized bus bar or insulated cable pr

Technical Data

General characteristics
STANDARD
TYPE-TESTED ASSEMBLIES (TTA)
TEST CERTIFICATE
Distribution transformer (TR), rated voltages
PRIMARY VOLTAGE Upri
0.22,3.3, 6.6, 11, 13.8, 20, 33 OTHER ON REQUEST UP TO 36 Kv
POWER FREQUENCY WITH STAND VOLTAGE Ud-pri
3, 28, 38, 50, 70 Kv for 1 min
LIGHTING IMPLUSE WITHSTAND VOLTAGE TOWARDS THE GROUND "BIL" UP-pri
75, 85, 95, 110, 125, 145, 170, 200 kV for 1.2/50 us 50Hz
SECONDRY VOLTAGE Usec
690 / 400, 480 / 277, 433 / 250, 415 / 240, 400 / 230, 231, / 133 V
POWER FREQUENCY WITHSTAND VOLTAGE Ud-SEC
3, 10 Kv
FREQUENCY f
50 /60 Hz
Distribution transformer (TR), rated capacity
RATING Sn
50- 3150 Kva
TYPE
OIL / DRY ON REQUEST
WINDING MATERIAL
Cu / Al
Distribution transformer (TR), general characteristics
VECTOR GROUP
Dyn11, OTHERS ON REQUEST
IMPEDANCE VOLTAGE Z%
4 /5 / 6 %
TEMPRATURE RISE TOP OIL / AVERAGE WINDING
50 /55 0C , OTHERS ON REQUEST
Low voltage switchboard (LV), rated voltages
RATED INSULATION VOLTAGE Ui
1000 V
RATED OPERATING VOLTAGE Ue
690 V
RATED IMPULSE WITHSTAND VOLTAGE Uimp
8 Kv
OVER VOLTAGE CATEGORY
I V
DEGREE OF POPULATION
3
RATED FREQUENCY
50 / 60 Hz
Low voltage switchboard (LV), rated currents
MAIN BUSBAR
RATED CURRENT Ie
ENCLOSED CONFIGURATION:5000 A EXPOSED TRANSFORMER CONFIGURA [cut off in source]
RATED PEAK WITHSTAND CURRENT Ipk
220 KA
RATED SHORT-TIME WITHSTAND CURRENT Icw
100 KA / 1s
Substation connections and accessibility
INTERNAL CONNECTIONS
CABLE/ BRAIDED BUSBAR / RIGID BUSBAR
EXTERNAL CONNECTIONS
CABLE
CONNECTION ENTRY
BOTTOM
CONNECTION ACCESS
FRONT/ SIDE
Dimensions
HEIGHT
1500, 1950, 2200, + (BASE & CANOPY) mm
WIDTH
1200, 1400, 1500, 1600, 1700, 1800, 2100, 2400, mm
DEPTH
1500, 1800, 2000 mm
DEGREES OF PROTECTIONS, ACCORDING TO IEC 60529
ENCLOSED CONFIGURATION TR 23, LV 43, EXPOSED TRANSFORMER CONFI [cut off in source] LV 54
Mechanical characteristics, steel components
FRAME AND CANOPY
1.5 / 2.0 mm
CLADDING
1. 0 mm
MOUNTING PAN
2.0 mm
COVER CLADING
1.2 / 1.5 mm
SKID BASE
80, 100, 140 mm
SURFACE PROTECTION: HOUSING
GI or ALU-ZINC
SURFACE PROTECTION: SKID BASE
UPN
FIXATION
ON CONCRETE FOUNDATION
Extras
TRANSFORMER ACCESSORIES
DGPT AS OPTION / Cu / Al
LV-SWITCH BOARD BUSBAR SYSTEM
FULLY INSULATED / SILVER PLATING / TIN PLATING
SUBSTATION PAINT
COLOR ON REQUEST

Unit Secondary Substation Elevates Power Distribution Efficiency

UTEC also offers a range of transformer maintenance, installation and commissioning and spare parts services to our customers. Discover the epitome of modern power distribution. The Unit Secondary Substation awaits, offering unparalleled efficiency, safet

Unit Substation

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