Overview of High Voltage Main Power Transformer

50KVA 100KVA 150KVA 200KVA 250KVA 300KVA 400KVA 450KVA 500KVA 20KV Oil Immersed Electrical Power Distribution Transformer is a device used to convert high voltage to lower voltage. It is critical in power systems, especially high-voltage transmission and distribution networks. The primary function of the high-voltage main power transformer is to ensure the stable operation of the power system while providing the required voltage for various power equipment.

Functional Principle of 50KVA 100KVA 150KVA 200KVA 250KVA 300KVA 400KVA 450KVA 500KVA 20KV Oil Immersed Electrical Power Distribution Transformer

• Voltage conversion: The most basic function of a high-voltage main power transformer is to perform voltage conversion. It reduces the high voltage in the power system to the voltage level required by the user. By changing the turn ratio of the primary side (high-voltage side) and secondary side (low-voltage side) coils, voltage rise and fall can be achieved.
• Impedance matching: Transformers can also play a role in impedance matching. For different loads, their impedance values also vary. Through the transformer’s voltage transformation effect, the impedance of the load can be matched with the impedance of the power supply system, thereby ensuring stable current transmission.
• Voltage regulation: By changing the number of turns of the primary side coil or the number of turns of the secondary side coil, the output voltage can be adjusted. In the power system, transformers are used to achieve segmented voltage control to meet the electricity needs of different users and equipment.
• Filtering function: Some particular types of high-voltage main power transformers also have a filtering function, which can filter out harmonics and reactive power components in the power supply and improve the quality of the power supply.

Specifications of 50KVA 100KVA 150KVA 200KVA 250KVA 300KVA 400KVA 450KVA 500KVA 20KV Oil Immersed Electrical Power Distribution Transformer

Here are the specifications for 20kV oil-immersed power distribution transformers, sizes 50kVA to 500kVA. These units reliably step down voltage for industrial and commercial power distribution. They handle incoming high voltage at 20kV and output lower voltages like 400V or 230V, depending on your specific needs.

The transformers come in standard ratings: 50kVA, 100kVA, 150kVA, 200kVA, 250kVA, 300kVA, 400kVA, 450kVA, and 500kVA. All models use mineral oil for insulation and cooling. Mineral oil effectively keeps the transformer core and windings at safe operating temperatures. The core itself uses high-grade, grain-oriented silicon steel. This steel minimizes energy losses during operation.

Efficiency is important. These transformers meet or exceed relevant international efficiency standards (like IEC 60076). Expect typical efficiency figures between 98% and 99% at full load. This high efficiency saves energy costs over the transformer’s long lifespan.

The transformers are built tough. The tank is welded steel construction. It provides strong mechanical protection and reliably contains the insulating oil. Standard protection includes a pressure relief device and an oil level gauge. Silica gel breathers keep moisture out of the oil. Basic lightning impulse withstand level (BIL) is 125kV. This helps the transformer withstand lightning strikes and switching surges on the 20kV line.

Standard temperature rise is 55K or 65K above ambient temperature. Cooling relies on natural convection (ONAN) for smaller units. Larger units often use forced air fans (ONAF) for extra cooling capacity. The transformers work outdoors. They are designed for pole mounting or placement on concrete pads. Standard impedance voltage ranges from approximately 4% to 6%. This value depends on the specific kVA rating. Lower impedance generally means better voltage regulation under changing load conditions.

Optional features include tap changers. Tap changers allow minor voltage adjustments. This helps maintain stable output voltage if the incoming voltage fluctuates. Additional accessories like temperature gauges, Buchholz relays, or protection cubicles are also available.

Applications of 50KVA 100KVA 150KVA 200KVA 250KVA 300KVA 400KVA 450KVA 500KVA 20KV Oil Immersed Electrical Power Distribution Transformer

These oil-immersed power transformers step down 20kV voltage to usable levels for many places. They are built tough for reliable power distribution. Their oil cooling makes them durable for demanding environments. You find them powering essential equipment across different sectors.

Smaller units like 50kVA and 100kVA are perfect for shops, small workshops, or pumping stations. They handle the needs of a modest business easily. Slightly larger 150kVA and 200kVA models suit bigger operations. Think medium factories, apartment complexes, or large retail stores. They power machinery, lighting, and HVAC systems reliably.

The 250kVA size is a common workhorse. It fits well in hospitals, schools, or larger commercial buildings. It provides stable power for critical systems and daily operations. Moving up, 300kVA and 400kVA transformers support heavier loads. They are ideal for industrial plants, bigger manufacturing facilities, or water treatment plants. These units handle large motors and continuous operation.

The largest units, 450kVA and 500kVA, meet high power demands. They are essential for heavy industries like mining, large factories, or major construction sites. They power large equipment and extensive facilities without issue. All these transformers are vital for rural electrification projects too. They bring power reliably to towns and villages.

Construction sites frequently use them for temporary power. They deliver safe voltage for tools and site offices. Their robust oil-immersed design withstands outdoor conditions well. These transformers are a fundamental part of getting electricity where it’s needed.

Company Profile

PDDN Photoelectron Technology Co., Ltd. is one of the leading enterprises in power electronics technology and power products, which is fully involved in developing solar inverters， transformers, voltage regulators, distribution cabinets, thyristors， modules， diodes， heaters, and other electronic devices or semiconductors. We will be committed to providing users with high-quality, efficient products and considerate service.

It accepts payment via Credit Card, T/T, West Union, and Paypal. PDDN will ship the goods to customers overseas through FedEx, DHL, by sea, or by air. If you want high-quality 50KVA 100KVA 150KVA 200KVA 250KVA 300KVA 400KVA 450KVA 500KVA 20KV Oil Immersed Electrical Power Distribution Transformer, please send us inquiries; we will be here to help you.

Payment Methods

L/C, T/T, Western Union, Paypal, Credit Card etc.

Shipment

By sea, by air, by express, as customers request.

Storage Conditions

1) Store in a dry environment at room temperature.

2) Avoid damp and high temperature.

3) Use immediately after opening the inner packing bag.

5 FAQs of 50KVA 100KVA 150KVA 200KVA 250KVA 300KVA 400KVA 450KVA 500KVA 20KV Oil Immersed Electrical Power Distribution Transformer

What size transformer do I need?
Match the transformer to your actual load. Add up all equipment power needs. Pick a transformer slightly larger than your total. This prevents overload. Experts can help calculate your exact requirement.

Why choose oil cooling?
Oil cooling works better than air for bigger transformers. Oil absorbs heat efficiently. The transformer runs cooler. This extends its working life. Oil also insulates internal parts well.

Installation requirements?
Place the transformer on a solid, level base outdoors. Ensure good airflow around it. Keep it away from buildings or flammable materials. Grounding is mandatory for safety. Follow all local electrical codes strictly.

Maintenance needed?
Check oil levels and quality regularly. Look for leaks. Clean the exterior to prevent dirt buildup. Schedule professional inspections yearly. Test the oil insulation strength periodically.

How long will it last?
Properly maintained oil transformers last decades. Expect 25 to 30 years of service. Regular maintenance is key. Protect it from overloads and moisture. Correct installation greatly affects lifespan.