Power Transformers

Your Professional Power Transformers Supplier

Wenzhou Shuowei Electric Co., Ltd. （SUVELL）is a high-tech enterprise specializing in the research, development, production and sales of transformer accessories, switch cabinet accessories, cable accessories, power fittings and transmission line accessories.

Our product portfolio includes pad-mounted transformers, pole-mounted transformers, oil-immersed load break switches, switchgear systems, and switchgear components.

66kV Power Transformers of Substation
Primary Voltage Ratings: 69kV 66kV 63kV or others
Secondary Voltage Ratings: 33/13.8/11 kV or others
H.V. Tap Range: ±8×1.25% or others
Connection Type: YNd11, Dyn11, YNd1,...
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138kV Power Transformers
Primary Voltage Ratings: 132kV, 138kV or others
Secondary Voltage Ratings: 11/10.5/6.6/6.3kV or others
H.V. Tap Range: ±8×1.25% or others
Connection Type: YNd11 or others
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220kV Power Transformers
It is a Step-down transformer that converts electrical voltage from 220KV to 110KV. The high voltage (HV) side of the transformer is rated at 220kv, while the low voltage (LV) side outputs 110kv....
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Why Choose us

Quality Assurance

The company is equipped with comprehensive production facilities and a robust testing system to ensure that all products meet international standards and satisfy customer requirements.

Professional Solution

With extensive experience and personalized one-to-one service, we are capable of assisting you in selecting suitable products and providing professional answers to technical inquiries.

Reasonable Price

Supported by a dedicated procurement and cost-control team, we strive to minimize production costs and optimize profit margins in order to offer you competitively priced solutions.

Parameter

Primary Voltage Ratings	69kV 66kV 63kV or others
Secondary Voltage Ratings	33/13.8/11 kV or others
H.V. Tap Range	±8×1.25% or others
Connection Type	YNd11, Dyn11, YNd1, Dyn1 or others
Type	Oil Immersed Transformer
BIL	Up to 350 kV
Standards	IEEE, CSA, AS, IEC
Application	Substation, solar plant, crypto mine
Power Rating	10000 kVA, 12 MVA, 15 MVA

Benefits of Power Transformers

Efficient power transmission

Power transformers enable efficient power transmission over long distances without significant loss, making them essential for modern electrical grids. By stepping up voltage for transmission, they reduce energy loss that occurs due to resistance in power lines. By facilitating reliable power distribution that overcomes distance challenges, transformers play a critical role in maintaining energy supply consistency.

Minimized power loss

Another benefit of transformers is their ability to minimize power loss. Adjusting voltage reduces energy dissipation during transmission. The resulting efficiency helps more power reach its intended destination, regardless of how far it' s traveling. Minimizing power loss is crucial for conserving energy and reducing costs.

Low maintenance

Transformers are known for their reliability and low maintenance needs, as they have no moving parts. Once installed, they require minimal upkeep, making them cost-effective in the long run. Furthermore, their durability ensures consistent performance, contributing to the stability of power distribution systems everywhere.

Applications of Power Transformers

Power generation: Power transformers are used to step up the voltage generated by power plants for transmission to substations.

Power transmission: Power transformers are used to step up or step down the voltage at different points of the transmission network for efficient power delivery.

Power distribution: Power transformers are used to step down the voltage for distribution to domestic or commercial users. It operates at variable loads depending on the demand and has good voltage regulation.

Power generation: Power transformers are used to step up the voltage of the electricity generated by power plants before it is sent to the grid. This reduces the current and the line losses during transmission.

Power transmission: Power transformers are used to step up or step down the voltage at different points of the transmission network for efficient power delivery. They also provide galvanic isolation and impedance matching between different circuits.

Power distribution: Power transformers are used to step down the voltage for distribution to various consumers. They also provide multiple voltage levels for different applications, such as lighting, heating, cooling, communication, etc.

Lighting: Power transformers are used to provide low voltage and high currents for lighting systems, such as fluorescent lamps, neon signs, etc.

Audio systems: Power transformers are used to isolate and amplify audio signals in speakers, amplifiers, microphones, etc.

Electronic equipment: Power transformers are used to provide low voltage and regulated power supply for electronic devices, such as computers, televisions, radios, etc.

The Construction of an Power Transformers

Primary Winding

The primary and secondary windings are built from stranded copper. The primary winding is connected to the electrical source, which produces magnetic flux. Both windings are insulated from each other and are coiled around the transformer' s core.
The magnetic flux passes through the transformer — it' s first induced in the primary winding. Then, it travels through the core via a low reluctance path to the secondary winding.

Core

The core is made from either silicone steel or soft iron. These materials provide a low reluctance path, which allows magnetic field lines to pass through easily. The core relays magnetic flux to the secondary winding. This creates a magnetic circuit, which closes the flux. The low reluctance path helps maximize flux linkage.
All transformer cores have laminated sheets for eddy current loss reduction and ensuring magnetic path continuity.

Secondary Winding

Once the magnetic flux passes through the core, it travels along the secondary winding, completing the flux movement and creating a magnetic circuit. Both windings are wound around the same transformer core, letting their magnetic fields work together to create motion. This motion allows the secondary winding to pick up momentum and finish the circuit.

Tank

The transformer' s tank surrounds the windings, core and other internal components. It protects, holds and cools the transformer' s core and windings. Heat is released as the magnetic flux is exchanged between the windings, and energy is moved.
The windings and core are housed in the transformer tank to prevent overheating or excess heat waste. This keeps the system cool and allows it to function more efficiently.

Logistics

We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc.

》The time frame of an order delivery is divided into two parts:
Processing time: 7-14 Days
Shipping time: 20~30 Days
》Shipping methods: DDP, DAP, EXW, etc.
》Shipping fee: The shipping fee will be changed according to every pacel's weight.

FAQ

Q: What should you never do with a transformer?

A: Never put fingers, sticks or other objects through cracks in the pad-mounted transformer. Never dig near a pad-mounted transformer. They are surrounded by underground cables. Hitting the cable could result in electrical shock or disruption of service.

Q: How to tell if a power transformer is bad?

A: Exterior bulging on the transformer.
Insulation color change.
Vibration changes. ...
Incorrect or lack of voltage.
Burn marks on or near the unit.
Irregular operation temperature.
Automatic protection devices activate when transformer first energizes.
Low insulation resistance.

Q: What is the average life of a power transformer?

A: While the average transformer life expectancy is typically twenty to thirty years, how long a transformer lasts and how efficiently it runs can range widely.

Q: What is the most common cause of transformer damage?

A: The most common cause of failure of transformer is insulation failure; it deteriorates due to heat, oxidation, acidity and moisture.

Q: How many ohms should a transformer read?

A: A transformer's winding resistance, typically measured in milliohms or low ohms, should be low and relatively consistent between windings of the same type (primary or secondary) and between phases in a multi-phase transformer. For example, a 3-phase transformer should have similar resistance readings across all phases.

We're professional power transformers manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale bulk power transformers in stock here from our factory. Contact us for quotation.

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