Pole Mounted Transformers

15 kVA to 333 kVA for overhead distribution lines. Single-phase and three-phase, with the fuse and arrester arrangements utilities ask for.

Technical specification

Power Rating	15 – 333 kVA
Primary Voltage	3.3 / 6 / 10 / 11 / 13.2 / 13.8 / 15 / 20 / 22 / 33 / 34.5 / 35 kV class
Secondary Voltage	480/277 V, 400/230 V, 380/220 V, or customized
Phase	Single-phase and three-phase
Cooling Type	ONAN
Core Material	High-efficiency (CRGO) silicon steel
Connection Group	Dyn11, Yyn0, Dyn5
Winding Material	Copper / Aluminium
Frequency	50 / 60 Hz
Insulation	Mineral oil
Tap Changer	± 2 × 2.5% Off-Circuit Tap Changer (OCTC)
Short-circuit impedance	4 – 6%
Temperature Rise	60 – 65 °C
Noise Level	≤ 60 dB at 1 meter
Enclosure	Weatherproof overhead tank
Altitude	≤ 1,000 m or customized
Ambient Temperature Range	-30 °C to +50 °C
Accessories	Conservator tank, oil level indicator, gas relay, pressure relief valve, etc.
Standards Compliance	IEC 60076, IEEE C57, ANSI C57
Applications	Commercial and institutional buildings, industrial facilities, oil & gas, solar and wind energy, utility grid connections, data centers, and coastal islands and high-altitude regions.
Transport & Installation	Lifting lugs, skid base, galvanized fittings
Warranty	Two years
Delivery Time	Typically 30 days, depending on quantity
Min. order quantity	≥ 1 set

15 · 25 · 50 · 100 · 167 · 250 · 333 kVA

Other ratings are built to order. If your rating is not on this list, send it anyway.

Tank: weatherproof, painted and sealed for overhead service.
Bushings: porcelain or polymer, with arcing horns where the utility asks for them.
Protection: internal expulsion fuse, surge arrester mounting provision.
Hanger: standard pole hanger brackets supplied.
Nameplate: stamped with rating, vector group, impedance and serial number.

Off-circuit ±2 × 2.5%, or an on-load tap changer.

Copper or aluminium, to the loss figures you need to meet.

Pressure relief device, gas relay, oil level and temperature indicators.

HV cable box or bushings, LV busbar or cable box.

Winding temperature indicator with alarm and trip contacts.

Standard industrial paint, or the colour your utility specifies.

Routine tests on every unit: winding resistance, ratio and vector group, insulation resistance, impedance voltage, separate-source and induced voltage withstand.
Type tests on request: temperature rise, lightning impulse, short-circuit withstand.
Designed and tested to IEC 60076. IEEE and ANSI practice applied for 60 Hz designs.
A test report in English goes out with every transformer.

What is the lead time?

Typically 30 days after drawing approval, depending on the quantity and the rating.

One set. We build to order, so a single transformer is a normal order for us.

Can you build to our drawing?

Yes. Send the specification, a data sheet or a photo of the old nameplate and we will quote against it.

How is the transformer packed?

Seaworthy export packing with desiccant and a moisture indicator; the exact case type is confirmed with the order.

What warranty do you give?

Two years from commissioning.

Every model below is built to order in the same Baoding factory. Open a sub-category to see models, ratings and specification tables.

Rating, primary and secondary voltage, frequency, quantity and the application. We answer within one working day.