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Three-Phase Oil-Immersed Underground Transformer
Oil-Immersed Transformer
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Three-Phase Oil-Immersed Underground Transformer

S11/13/20/22-M▪D Series

Product Overview
S11/13/20/22-M▪D Series oil-immersed underground transformer, is a type of power equipment that places main devices such as transformers underground, featuring fully sealed design, underground installation, high energy efficiency, safety and reliability. It breaks the traditional above-ground setup of transformers, and is widely applied in urban distribution networks, industrial parks, residential areas and other fields, providing important support for modern urban power supply.

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    product details

    Model Definition

    product-description1-15

    Features

    ● Energy Efficiency
    Adopts low-loss materials and energy-saving structural design, significantly reducing no-load/short-circuit losses and enhancing energy utilization efficiency, compliant with green and low-carbon standards.
    ● Fully Sealed for Reliable Operation
    With fully sealed and insulated design, achieving IP68 rating for moisture/water/dust protection. Equipped with high-efficiency heat dissipation system to ensure long-term stable power supply in harsh environments.
    ● Environment-Friendly Design
    Underground installation substantially reduces noise (≤55dB) and electromagnetic radiation. Surface equipment integrates advertising light boxes with power distribution functions, balancing aesthetics and practicality.
    ● Ultimate Space Optimization
    The main body is buried underground, occupying zero ground space, especially suitable for space-sensitive areas like city centers and commercial districts.
    ● Safety and Landscape Integration
    Surface equipment integrates LV switch boxes with landscape facilities, minimizing safety hazards while enhancing the urban visual environment.
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    Range of application

    It is suitable for installation in basements or cellars, especially in densely populated central cities. It is also applicable to lighting and power systems in streets, highways, bridges, tunnels, parking lots, airports, ports, tourist attractions and other locations. In addition, the underground transformer can be combined with billboards to form a hybrid structure integrating billboards and low-voltage switch boxes, which can be used for public service advertisements, traffic guides, etc.

    Technical specifications

    Rated capacity (kVA)

    Rated voltage

    Vector group

    No-load loss (W)

    Load loss (W)

    No-load current (%)

    Impedance voltage (%)

    HV (kV)

    Tapping range (%)

    LV (kV)

    11#

    13#

    20#

    22#

    11/13#

    20#

    22#

    11#

    13#

    20#

    22#

    30

    6 6.3 6.6 10 10.5 11

    ±5 or ±2×2.5

    0.4

    Dyn11 or Yyn0

    100

    80

    70

    65

    630/600

    505/480

    455/430

    0.3

    0.3

    0.24

    0.23

    4

    50

    130

    100

    90

    80

    910/870

    730/695

    655/625

    0.24

    0.23

    0.24

    0.23

    80

    180

    130

    115

    105

    1310/1250

    1050/1000

    945/900

    0.22

    0.18

    0.21

    0.20

    100

    200

    150

    135

    120

    1580/1500

    1265/1200

    1140/1080

    0.21

    0.16

    0.21

    0.20

    125

    240

    170

    150

    135

    1890/1800

    1510/1440

    1360/1295

    0.2

    0.15

    0.19

    0.18

    160

    280

    200

    180

    160

    2310/2200

    1850/1760

    1665/1585

    0.19

    0.14

    0.18

    0.17

    200

    340

    240

    215

    190

    2730/2600

    2185/2080

    1970/1870

    0.18

    0.12

    017

    0.16

    250

    400

    290

    260

    230

    3200/3050

    2560/2440

    2300/2195

    0.16

    0.12

    0.14

    0.13

    315

    480

    340

    305

    270

    3830/3650

    3065/2920

    2760/2630

    0.16

    0.11

    0.13

    0.12

    400

    570

    410

    370

    330

    4520/4300

    3615/3440

    3250/3095

    0.16

    0.11

    0.13

    0.12

    500

    680

    480

    430

    385

    5410/5150

    4330/4120

    3900/3710

    0.16

    0.1

    0.12

    0.11

    630

    810

    570

    510

    460

    6200

    4960

    4460

    0.15

    0.09

    0.12

    0.11

    4.5

    800

    980

    700

    630

    560

    7500

    6000

    5400

    0.15

    0.09

    0.1

    0.1

    1000

    1150

    830

    745

    665

    10300

    8240

    7415

    0.14

    0.09

    0.1

    0.09

    1250

    1360

    970

    870

    780

    12000

    9600

    8640

    0.13

    0.08

    0.1

    0.09

    1600

    1640

    1170

    1050

    940

    14500

    11600

    10440

    0.12

    0.07

    0.09

    0.08

    2000

    1940

    1360

    1225

    1085

    18300

    14640

    13180

    0.11

    0.09

    0.09

    0.08

    5.5

    2500

    2290

    1600

    1440

    1280

    21200

    14840

    13360

    0.11

    0.08

    0.09

    0.08

    3150

    2750

    2180

    24100

    0.11

    0.08

    6
    Note:  The above data is subject to change due to technical improvement.

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