Three Phase Pad mounted Transformer Overview
- ZGS series Pad Mounted Transformer, it is the transformer, switchgear, fuse, tap switch, low voltage distribution device and other relevant auxiliary equipment combination transformer, can meet the user's energy measurement, reactive power compensation, low voltage branch and other configuration requirements.for utility, commercial or industrial applications, designed to withstand many types of environments. These transformers can be located outside or inside buildings to offer an energy efficient and safer solution. Fluid-filled transformers are available in a wide variety of configurations and can be paired with a large selection of accessories to meet the most basic and the most complex of specifications.
- Rated AC frequency 50Hz/ 60Hz, maximum working voltage to 38.5KV
- The equipment is widely used in industrial parks, urban residential areas, commercial centers, high-rise buildings and other places
- Products are mainly sold to USA,East Asia, Southeast Asia and other regions, providing OEM/ODM services
Three Phase Pad mounted Transformer Advantage
2. Certification: ISO、CE、IEC、CSA、UL
3. Efficiency: The efficiency of a 500kva transformer is greater than 99%, which can meet the DOE2016 energy efficiency regulations.
4. Maintenance free: IP54 (NEMA 3R) protection level, dustproof and moisture-proof, maintenance free, design life>25 years.
5. Environmental Protection and Sustainable Development: FR3 vegetable oil can be used, with a biodegradation rate of over 95%.
Three Phase Pad mounted Transformer Technical Specifications
- Capacity: 75KVA,112.5KVA,150KVA, 200KVA, 250KVA, 300kVA, 315KVA, 400KVA, 500KVA, 630KVA, 750kVA, 800KVA, 1000KVA, 1500KVA, 2500KVA, 30000KVA,etc
Rated voltage: 7.2-34.5kv
Maximum operating voltage (kV) 38.5kV
|
Pad Mounted Transformer Technical Specification |
|
RatedPower(KVA) |
H.V(KV) |
L.V（V） |
Loss(W) |
Dimension（CM） |
Weight(KG) |
|
No-loadLoss (W) |
On-loadLoss (W) |
W |
D |
H |
Oil Weight |
Total Weight |
|
75KVA |
34.5KV
24.9KV
19.92KV
13.8KV
13.2KV
7.62KV
12.47KV
7.2KV |
240V480V
480Y/277V
600Y/347V |
180 |
1250 |
1390 |
910 |
1430 |
120 |
645 |
|
112.5KVA |
200 |
1500 |
1420 |
920 |
1430 |
138 |
729 |
|
150KVA |
280 |
2200 |
1510 |
980 |
1530 |
201 |
989 |
|
225KVA |
400 |
3050 |
1600 |
1000 |
1660 |
230 |
1195 |
|
300KVA |
480 |
3650 |
1660 |
1080 |
1680 |
260 |
1415 |
|
500KVA |
680 |
5100 |
1810 |
1160 |
1790 |
325 |
1905 |
|
750KVA |
980 |
7500 |
2030 |
1300 |
2030 |
535 |
2755 |
|
1000KVA |
1150 |
10300 |
1651 |
1549 |
1854 |
650 |
3235 |
|
1500KVA |
1640 |
14500 |
2210 |
1470 |
2150 |
748 |
5835 |
|
2000KVA |
2160 |
20645 |
2380 |
1600 |
2220 |
950 |
6430 |
|
2500KVA |
2680 |
27786 |
2480 |
1650 |
2330 |
1020 |
8865 |
STANDARD COMPONENTS
Connections and neutral configurations
• Delta - Wye: Low voltage neutral shall be a fully insulated X0 bushing with removable ground strap.
• Grounded Wye-Wye: High voltage neutral shall be internally tied to the low voltage neutral and brought out as the H0X0 bushing in the secondary compartment with a removable ground strap.
• Delta-Delta: Transformer shall be provided without a neutral bushing.
• Wye-Wye: High voltage neutral shall be brought out as the H0 bushing in the primary compartment and the low voltage neutral shall be brought as the X0- bushing in the secondary compartment.
• Wye-Delta: High voltage neutral shall be brought out as the H0 bushing in the primary compartment. No ground strap shall be provided (line to line rated fusing is required).
High and low voltage bushings
• 200 A bushing wells (15, 25, and 35 kV)
• 200 A, 35 kV Large Interface
• 600 A (15, 25, and 35 kV) Integral bushings (dead-front)
Electrical-grade wet-process porcelain bushings(live-front)
Tank/cabinet features
• Bolted cover for tank access (45-2500 kVA)
• Welded cover with hand hole (>2500 kVA)
• Three-point latching door for security
• Removable sill for easy installation
• Lifting lugs (4)
• Stainless steel cabinet hinges and mounting studs
• Steel divider between HV and LV compartment
• 20" Deep cabinet (45-1000 kVA)
• 24" Deep cabinet (1500-7500 kVA)
• 30" Deep cabinet (34.5/19.92 kV)
• Pentahead captive bolt
• Stainless steel 1-hole ground pads (45-500 kVA)
• Stainless steel 2-hole ground pads (750-10,000 kVA)
• Parking Stands (dead-front)
Valves/plugs
• One-inch upper filling plug
• One-inch drain plug (45-500 kVA)
• One-inch combination drain valve with sampling device in low voltage compartment (750-10,000 kVA)
• Automatic pressure relief valve
Nameplate
• Laser-scribed anodized aluminum nameplate
Three Phase Pad mounted Transformer Case show
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Three Phase Pad mounted Transformer FAQ
1. What is a pad mounted transformer?
Pad type is a type of power transformer that integrates high-voltage switchgear, oil immersed transformers, and low-voltage distribution equipment into a closed metal box, complying with North American standards such as NEMA, ANSI, IEEE, and commonly used in urban power grids and industrial distribution.
What is the difference between a pad mounted transformer and a regular three-phase transformer?
• Structural difference: The gasket mounted transformer bushing and other accessories are sealed inside the box for greater safety
• High voltage connection: commonly used T-head or elbow cable plug-in connectors for pad mounted transformers;
• Overload capacity: Pad mounted transformers have higher overload capacity than ordinary transformers
Production cost: Pad mounted transformers use more materials, resulting in higher costs
What are the typical application scenarios of pad mounted transformers?
Roadside power distribution in urban residential areas and commercial centers;
Distributed power supply for industrial parks or large factories;
Rapid access to temporary construction sites and new energy power stations (such as photovoltaics);
North America, South America, and the Middle East follow the American standard for power grid renovation.
How to choose the protection level for pad mounted transformers?
• Basic outdoor: NEMA 3R (rain and snow protection, ventilation and heat dissipation);
• Harsh environment: NEMA 4 (anti spray, dust) or NEMA 4X (corrosion-resistant);
Compare IP ratings: NEMA 3R≈IP24，NEMA 4≈IP66。
What are the installation requirements for pad mounted transformers?
• Foundation: The load-bearing capacity of the concrete platform is ≥ the total weight of the box (containing approximately 1-10 tons of oil);
Ventilation: Reserve at least 1 meter of space around the box to avoid direct sunlight;
Grounding: Grounding resistance ≤ 4 Ω, multi-point grounding is better;
Cable entrance: Sealed and waterproof treatment to prevent small animals from entering.
What is the maintenance cycle and key items for pad mounted transformers?
Daily inspection: check the oil level, oil temperature, and sealing of the box every month;
Annual maintenance: testing insulation oil breakdown voltage (≥ 30kV), cleaning high-voltage bushings;
5-year overhaul: Check the oxidation condition of cable joints and replace aging seals.
How to deal with the fault of the T-shaped cable head on the high voltage side?
• Fault manifestations: connector overheating, discharge sound, or fuse failure;
1. Power off and verify the power supply;
2. Disassemble the T-shaped head and check if the insulation layer is carbonized;
3. Replace damaged parts, apply special silicone grease and reinstall.
What is the energy efficiency and losses of the pad mounted transformer?
Energy efficiency standards: refer to NEMA TP-1 or DOE regulations;
Optimization suggestion: Choosing amorphous alloy iron core can reduce no-load loss by 30%~50%.
