What Are 33–35 kV Class Pad-Mounted Transformers?

33–35 kV Class Pad-Mounted Transformers are high-voltage, oil-immersed distribution transformers designed for outdoor ground-level installations. Enclosed in tamper-proof steel cabinets, they provide safe, reliable power transformation from 33 kV or 35 kV to low-voltage outputs such as 400 V, 480 V, or 600 V.

These transformers are ideal for heavy industrial zones, end-of-line substations, renewable energy collection points, and long-distance primary distribution systems where compact design and robust performance are essential.

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Why Use 33–35 kV Class Pad-Mounted Transformers?

High-Voltage Capability

Built for ANSI 35 kV class systems, these transformers handle high short-circuit currents and large power demands in primary or sub-transmission networks.

Outdoor Durability

Sealed tank design with weatherproof, corrosion-resistant enclosures ensures long-term performance in challenging climates—rain, heat, dust, or humidity.

Utility-Ready Configuration

Pre-installed with bushings, fuses, switches, and grounding systems, they support both radial and loop feed applications in utility and industrial networks.

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Key Features of 33–35 kV Class Pad-Mounted Transformers

Construction

Oil-filled, sealed steel tank with natural convection cooling (ONAN), and optional radiators for heat dissipation.

Voltage Ratings

Primary: 33 / 34.5 / 35 kV
Secondary: 208 / 240 / 277 / 400 / 480 / 600 V (customizable)

Tap Changing

Equipped with off-circuit tap changers (±2×2.5%) or on-load tap changers for voltage adjustment.

Protection and Monitoring

Includes pressure relief valves, oil level gauges, temperature indicators, bayonet fuses, lightning arresters, and optional CSP (completely self-protected) features.

Cabinet Design

Tamper-proof, ANSI/IEEE-compliant enclosure with dead-front or live-front access. Available in single- or three-phase configurations.

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Applications of 33–35 kV Class Pad-Mounted Transformers

• Utility substations and long-distance distribution

• Industrial plants with high-capacity machinery

• Wind or solar energy collection points

• Airports, ports, and logistics centers

• Heavy commercial and infrastructure developments

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Standards and Compliance

International Standards:
ANSI C57.12.34, IEEE C57.12.00 / C57.12.28, IEC 60076, CSA, GB

Testing:
100% routine tests as per IEEE/IEC; type and special tests available upon request

Certifications:
CE, ISO9001, ISO14001, ISO45001, RoHS (on request)

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Advantages of 33–35 kV Class Pad-Mounted Transformers

• Supports high-load, high-voltage distribution

• Compact ground-mounted design with low installation cost

• Maintenance-free sealed tank with long service life

• Suitable for harsh outdoor environments

• Fully customizable voltage, impedance, and terminal configuration

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Choose CHBEB

Choose CHBEB 33–35 kV Class Pad-Mounted Transformers for high-voltage power distribution that demands durability, safety, and performance. With over 60 years of manufacturing experience, CHBEB delivers advanced transformer solutions for utilities, EPCs, and energy-intensive industries worldwide.

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👉 Technical Specifications:
Please refer to the table below for detailed specifications of our 33–35 kV Pad-Mounted Transformer Series:

Rated Capacity KVA	High Voltage KV	Low Voltage KV	Tapping Range& Vector symbol	Loss(W)
				No-load	On-load
30KVA	6.3KV 7.2KV 7.62KV 8.6KV 12.47KV 13.2KV 13.8KV 19.8KV 19.92KV 23KV 34.5KV 35KV   To be requested by customers	110V 220V 230V 240V 347V 480V 277V 600V	±5 （±2*2.5）   Yyn0 Dyn11	110	500
63KVA				200	1040
75KVA				180	1250
125KVA				220	1700
150KVA				280	2200
225KVA				400	3050
300KVA				480	3650
500KVA				680	5100
750KVA				980	7500
1000KVA				1150	10300
1500KVA				1640	14500
2000KVA				2160	20645
2500KVA				2680	27786
3000KVA				3300	30300
3750KVA				4125	37875