Product Introduction
50kVA and 75kVA pole mounted transformers are medium capacity distribution equipment in power systems, mainly used to convert high voltage electricity (such as 10kV) into low voltage electricity (such as 0.4kV) suitable for user use. They are widely used in urban and rural power grids, small industrial and commercial areas, and other scenarios.
Comparison of Technical Parameters
|
Comparative Dimension |
50kVA |
75kVA |
Additional notes |
|
Applicable scenarios |
Residential areas, small commercial or light industrial power supply |
Large residential areas, medium-sized commercial or power consumption |
Both are distribution transformers used to reduce high voltage to around 400V for end users to use |
|
Installation spacing |
11.5 inches (approximately 292mm) |
23.25 inches (approximately 591mm) |
This is the center distance between the two mounting bolt holes at the bottom of the transformer, which is an important dimension during installation. |
|
Cooling method |
ONAN |
ONAN |
The vast majority of column mounted transformers use this cooling method that does not require an external fan. |
|
Number of phases |
Single-phase or three-phase |
Single-phase or three-phase |
Single phase is commonly used in American systems, while three-phase is commonly used in domestic and European systems |
|
High voltage side |
10kV, 13.2kV, 13.8kV etc |
10kV, 13.2kV, 13.8kV etc |
The specific voltage level needs to be selected according to the local power grid standards. |
|
Low voltage side |
220V, 400V etc |
120/240V, 400V etc |
Single phase is commonly 240/120V dual voltage, while three-phase is commonly 400V |
|
Installation height |
The lowest distance from the ground on the pole is more than 7 feet (about 2.1 meters) |
The lowest distance from the ground on the pole is more than 7 feet (about 2.1 meters) |
This is a basic safety requirement, and specific projects may have stricter regulations. |
Selection and Installation Precautions
When selecting and installing, there are several key engineering details that you need to pay special attention to:
1.Choose the appropriate type
- Oil immersed: the most common, cost-effective, suitable for outdoor environments.
- Dry type: It is used in indoor or specific outdoor environments with high fire prevention requirements, but installation on columns is relatively rare.
2.Winding material and losses
- Copper vs Aluminum: Copper windings have good conductivity and strong heat resistance, but they are expensive; Aluminum windings are more economical, but they may be slightly larger in size. When making a choice, it is necessary to strike a balance between performance and budget.
- Loss level: Priority should be given to selecting energy-saving products that meet national energy efficiency standards (such as GB 20052), which can save electricity costs over long-term operation.
3.Supporting components and installation
- Complete set of equipment: Nowadays, many projects require the purchase of complete sets of column mounted transformer platforms, which include drop out fuses, lightning arresters, integrated distribution boxes (JP cabinets), etc., which can save a lot of trouble in equipping them themselves.
- Safe grounding: The transformer casing and neutral points on both high and low voltage sides must be reliably grounded according to regulations, which is the foundation for ensuring personal and equipment safety.
FAQs
Q1:How to choose between 50kVA and 75kVA?
A: Determine based on actual load:
The load is stable at 30-40kW → 50kVA, which is sufficient;
Load approaching 50kW or with room for growth → Directly increase to 75kVA;
There is a three-phase large motor (such as a 30kW water pump) → It is recommended to choose 75kVA or above.
Q2: How to choose between a single pole or a double pole?
A: There is a clear boundary: 50kVIt can be installed on a single pole (with transformers, high-voltage drop out fuses, and lightning arresters installed on the same pole), with a simple structure and minimal material usage;
75kVIt should be installed with double poles (consisting of a high-voltage terminal pole and another auxiliary pole), which is more sturdy and reliable.
Q3:How to prevent from birds and small animals?
A: Install insulation cover on the high voltage side and apply bird proof coating to the sleeve; Low voltage side outgoing lines are protected with flame-retardant pipes.
Q4:When will the pole mounted transformers must be replaced with a transformer box?
A: ① Capacity>400kVA ② High requirements for urban landscape ③ Thunderstorm or heavily polluted areas ④ Space is limited and requires low noise.
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