What Is a Single Phase Distribution Transformer?

A Single Phase Distribution Transformer is an electrical device that steps down high-voltage electricity to a lower voltage that can be safely used in homes, small businesses, or light industrial settings. It operates on the principle of electromagnetic induction, transferring energy between two coils — the primary (high voltage) and secondary (low voltage) windings — without any direct connection.

This type of transformer is designed for single-phase electrical systems, which are common in residential and light commercial applications where the electrical demand is lower than in large industrial facilities.

Single Phase Pole Mounted Transformer DrawingDrawing

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Why Use a Single Phase Distribution Transformer?

Single phase transformers are simple, cost-effective, and reliable. They are ideal for areas where only a small load is required or where three-phase power is not available. Because of their compact design and lower installation costs, they are frequently used for:

• Rural or suburban power distribution

• Residential buildings

• Small offices or shops

• Isolated equipment like pumps, fans, or lighting systems

Their ease of maintenance and high efficiency at lower loads make them a preferred choice for utility companies and infrastructure developers.

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How Does It Work?

The transformer receives high-voltage electricity from the power grid and reduces it to a safer, usable level — typically 120V or 240V — through internal magnetic coils. The process is passive and requires no moving parts, which makes the device highly durable and long-lasting.

Most single-phase transformers are oil-immersed or dry-type, depending on the cooling and insulation needs. Oil-filled types offer better heat dissipation, while dry-type versions are often used indoors or in environmentally sensitive areas.

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What Are the Key Features?

A standard single phase distribution transformer includes:

• Rated capacity: Usually ranges from 5 kVA to 167 kVA

• Input voltage (primary): Typically 11 kV or 33 kV

• Output voltage (secondary): Commonly 240V or 120/240V split

• Cooling method: Oil-immersed (ONAN) or Dry type (AN)

• Construction: Pole-mounted or pad-mounted designs for flexible installation

• Standards compliance: Designed to meet IEC, IEEE, or ANSI standards

These features ensure reliable performance under varying load conditions, especially in residential and light commercial power distribution.

Single Phase Pole Mounted TransformerTechnical data

Single-Phase Distribution Transformer
Rated Power	High Voltage	Low Voltage	W(mm)	D(mm)	H(mm)	Weight(kg)
5 kVA	34.5kV/19.92kV 13.8kV/7.9kV 13.2kV/7.6kV 12.47kV/7.2kV or others	120-240V 240-480V 347V 600V	400	530	960	115
10 kVA			430	530	980	150
15 kVA			480	580	1000	205
25 kVA			500	580	1030	245
37.5 kVA			560	640	1080	335
50 kVA			560	640	1130	370
75 kVA			780	800	1170	505
100 kVA			710	800	1230	530
167 kVA			795	895	1335	680

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Where Are Single Phase Transformers Used?

You’ll often find single phase distribution transformers mounted on utility poles in neighborhoods or placed in small substations near buildings. They are also widely used in:

• Farmlands and remote cabins

• Telecommunication equipment sites

• Street lighting systems

• Low-power industrial control panels

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Is It the Right Choice for Your Project?

If you’re working on a residential development, rural electrification project, or need a cost-effective solution for low-load applications, a Single Phase Distribution Transformer is likely the perfect fit. It offers the performance you need without the complexity or expense of a three-phase system.

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Why Choose CHBEB?

CHBEB’s Single Phase Distribution Transformer is designed and manufactured with precision, reliability, and long-term performance in mind. As a professional transformer manufacturer, CHBEB ensures every unit meets international standards and real-world power demands.

Choosing CHBEB means securing your electrical safety for years to come.