50 kVA Pad-Mounted Distribution Transformer is prepared for ground-level utility and industrial distribution. This series description presents the application, construction, protection, and specification details in finished product copy.
Key Advantages
For ground-level utility and industrial distribution, key Advantages is treated as a practical design and selection point rather than generic catalog wording.
Featuring compact design and reliable performance, this 50 kVA pad-mounted transformer uses copper or aluminum windings and supports primary voltages of 10–35 kV at 50/60 Hz, providing efficient operation for residential or small-scale urban distribution networks.
Product Use
For ground-level utility and industrial distribution, product Use is treated as a practical design and selection point rather than generic catalog wording.
The pad - mounted transformer serves as an integrated prefabricated product that combines distribution network power supply unit cables, high - voltage control, protection, substation, and power distribution equipment. It is widely applied in urban and rural distribution networks. The transformer and high - low voltage equipment are closely connected into one unit. Three sides of the transformer are exposed to the air, ensuring good heat dissipation conditions. Moreover, the transformer can be separated from the high - low voltage equipment housing, facilitating maintenance. Power distribution switchgear is installed on the high and low voltage sides.
Model Description
For ground-level utility and industrial distribution, model Description is treated as a practical design and selection point rather than generic catalog wording.
Taking the ZBW series as an example, the model is represented as ZBW - 12/0.4 - □ - □ - □.
The first part "ZBW" indicates the prefabricated substation.
"12/0.4" represents the rated voltage levels, with 12kV for the high - voltage side and 0.4kV for the low - voltage side.
The subsequent boxes respectively denote the high - voltage measurement of rated voltage (KV), low - voltage measurement of rated voltage (KV), and rated capacity of the transformer (KVA).
Use Environment
For ground-level utility and industrial distribution, use Environment is treated as a practical design and selection point rather than generic catalog wording.
The pad-mounted transformer must operate under specific environmental conditions to ensure stable performance and safe operation, with requirements integrated from both data sources as follows.
Cooling Condition Adopts air self-cooling mode, relying on natural air circulation to dissipate heat generated during transformer operation, which is suitable for its structural design and common application scenarios.
Wind speed: Equivalent to 34m/s (not more than 700 Pa).
Temperature Requirement The outdoor ambient temperature shall not be higher than 40℃ and not lower than -45℃. The monthly average temperature shall not exceed 30℃, and the annual average temperature shall not exceed 20℃. This limits the long-term temperature load on the transformer to avoid performance degradation caused by extreme temperature accumulation.
Altitude Requirement The installation altitude shall not exceed 1000m.
Humidity Requirement At a temperature of 25℃, the maximum relative humidity of the air shall not exceed 95%, and the daily average relative humidity shall not exceed 90%.
Product Advantages
For ground-level utility and industrial distribution, product Advantages is treated as a practical design and selection point rather than generic catalog wording.
Compact structure, small size, easy installation.
Applicable to ring network and terminal power supply, ensuring personal safety.
Low loss, low noise, excellent performance, and anti-theft box structure.
Low temperature rise and strong overload capacity.
Product Structure Features
For ground-level utility and industrial distribution, product Structure Features is treated as a practical design and selection point rather than generic catalog wording.
Transformer and Chambers: The pad-mounted transformer uses the 813 series oil-immersed transformer with a chip-type oil tank (no oil cushion, fully enclosed). High/low-pressure bushings, tap changers, oil level indicators, pressure release valves, oil release valves, etc., are mounted on the high-pressure chamber end plate for easy observation and operation. Its high/low-pressure chambers are separated by steel plates (relatively independent) and integrated into a complete box.
Components: It is equipped with plug - in fuses, pressure gauges, pressure relief valves, oil level gauges, oil thermometers, load switches, high - voltage cable joints, off - circuit tap changers, ground points, drain valves, and low - voltage switch cabinets, etc.
Load Switch: It is an oil - immersed, three - phase linkage switch with a spring operating mechanism. It can be operated with load, and its closing speed has nothing to do with the operating force. There are types such as two - station, four - station T type, and four - T position V type to choose from.
Basic Construction and Technical Requirements
For ground-level utility and industrial distribution, basic Construction and Technical Requirements is treated as a practical design and selection point rather than generic catalog wording.
● Foundation Bearing Capacity and Protection The foundation bearing capacity shall be not less than 100 kPa.
If the foundation is located in highlands, external drainage systems shall be provided around it.
The foundation shall be built with red brick cement mortar, and both inner and outer walls shall be plastered with 20mm-thick 1:2 cement mortar mixed with 3% waterproofing agent to enhance waterproofing.
The concrete foundation surface shall be flat, and after installation of the prefabricated substation, the surrounding foundation shall be sealed with cement.
● Structure and Embedded Parts.
The bottom of the cable chamber shall be slightly inclined toward the water collection pipe to prevent water accumulation.
Electrical and Mechanical Data
The table data is organized for quick rating comparison, project specification, and transformer selection.
S/N
Name
Unit
Technical Parameter
1
Rated Voltage
KV
10/0.4
2
High-voltage Side Rated Voltage
KV
10
3
Low-voltage Side Rated Voltage
KV
0.4
4
Maximum operating voltage (High voltage side)
KV
12
5
Rated Frequency
Hz
50
6
Rated Capacity
KVA
150-1600
7
High-voltage Switch Heat Stable Capacity
KA
20/26
8
Low-voltage Main Circuit Breaker Rated Short-circuit Breaking Capacity
KA
35
9
Low-voltage Distribution Circuit Breaker Rated Short-circuit Breaking Capacity
KA
35
10
High-voltage Load Switch Transfer Current
A
>1500
11
1 min Power Frequency Withstand Voltage
KV
35
12
Lightning Impulse Voltage
KV
75
13
Cooling Mode
Oil immersed self-cooling
14
High-voltage Backup Fuse Breaking Current
KA
50
15
Breaking Current of Plug-in Fuse
KA
2.5
16
Ambient Temperature
℃
35 ~ +40
17
Coil Allowable Temperature Rise
K
65
18
No-load Voltage Regulation
%
±5% or ±2 × 2.5%
19
Noise Level
DB
<50
20
Protection Grade of Box Shell
Not less than IP3X
Rated voltage(KV)
10
0.4
Transformer
Switch to ground and phase to phase
Between disconnectors
Power frequency withstand voltage (KV)
35
42
48
2.5
Peak value of impulse withstand voltage(KV)
75
75
85
–
Capacity KVA
Voltage KV
Join group label
No-load current %
No load loss W
Impedance voltage %
Load loss
High tension
Low pressure
S9
S10
S11
S9
S10
S11
160
10±5% or 2×2.5%
0.4
Dyn11 Yno
1.4
1.4
0.2
400
320
255
4.0
2200
200
1.3
1.3
0.2
480
380
305
2600
250
1.2
1.2
0.2
560
450
360
3050
315
1.1
1.1
0.2
670
530
425
3650
400
1.0
1.0
0.15
800
650
505
4300
500
1.0
1.0
0.15
960
750
605
5100
630
0.9
0.9
0.15
1200
910
755
6200
800
0.8
0.8
0.15
1400
1080
980
7500
1000
0.7
0.7
1700
1260
4.5
10300
1250
0.6
0.6
1950
12000
Item Name
Units
315A
630A
Rated voltage
KV
12
12
Maximum current
A
315
630
Rated frequency
Hz
50
50
Rated short-circuit closing current
KA
31.5
50
Rated short-time withstand current
KA
12.5
50
Rated short endurance time
S
2
2
Mechanical life
Second-rate
2000
2000
Lightning impulse test
Phase to phase
KV
75
75
Isolation fracture
85
85
1min power frequency withstand voltage
Phase to phase
KA
42
42
Isolation fracture
48
48
Rated peak withstand current
KV
31.5
50
Capacity
A
B
C
H
Weight KG
200kVA and below
1830
1420
820
1850
＜ 2800
250-400kVA
1830
1450
850
1980
3000-3300
500-630kVA
1830
1480
880
2070
3600-3950
800kVA
2200
1700
950
2170
4500
Capacity
A
B
C
H
Weight KG
315kVA
2560
1600
600
1000
3050
400kVA
2560
1600
600
1000
3270
500kVA
2560
1600
600
1000
3400
630kVA
2560
1600
600
1000
3900
800kVA
2760
1600
800
1000
4200
1000kVA
2760
1950
800
1000
4800
1250kVA
2910
1950
800
1000
5400
1600kVA
2200
1700
950
2170
4500
Product Detail Images
50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 1.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 2.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 3.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 4.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 5.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 6.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 7.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 8.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 9.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 10.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 11.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 12.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 13.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 14.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 15.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 16.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 17.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 18.50 kVA Pad-Mounted Distribution Transformer enclosure, bushing, and cable compartment detail 19.
