What Are 20–24 kV Class Pad-Mounted Transformers?

20–24 kV Class Pad-Mounted Transformers are oil-immersed, ground-mounted distribution transformers designed for medium-voltage systems that operate at ANSI 25 kV class levels. With tamper-proof enclosures and sealed tank construction, they are well-suited for outdoor installations in utility, industrial, and renewable energy projects.

These transformers are commonly used in systems rated at 20 kV, 22 kV, or 24 kV and provide safe and efficient step-down power distribution to secondary voltages such as 400V, 480V, or 600V.

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Why Use 20–24 kV Class Pad-Mounted Transformers?

Medium-Voltage Reliability:
Optimized for longer feeders and higher load density, these units are ideal for expanding urban grids, industrial zones, and energy transition networks.

Rugged Outdoor Design:
Constructed with weatherproof, corrosion-resistant enclosures and oil-filled cooling systems (ONAN), they offer high performance in challenging environmental conditions.

Efficient and Compact:
Their compact footprint and pad-mounted structure eliminate the need for substation fencing or indoor space, making installation simple and secure.

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Key Features of 20–24 kV Class Pad-Mounted Transformers

Voltage Ratings:
Primary: 20 / 22 / 24 kV
Secondary: 208 / 240 / 277 / 480 / 600 V (customizable)

Insulation & Cooling:
Mineral oil-filled, sealed tank design with natural convection (ONAN) cooling

Tap Changer Options:
Off-circuit tap changers (±2×2.5%) or on-load tap changers available upon request

Protection Components:
Includes pressure relief valve, oil level gauge, thermometer, bayonet fuses, and optional surge arresters or CSP functionality

Enclosure:
Tamper-resistant, ANSI-standard cabinet with live-front or dead-front access, suitable for both radial and loop feed systems

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Applications of 20–24 kV Class Pad-Mounted Transformers

• Urban and suburban medium-voltage distribution networks

• Industrial parks and manufacturing facilities

• Utility-scale solar or wind feeder connections

• Commercial complexes and data centers

• MV interconnections in remote or space-limited locations

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Standards and Compliance

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

Testing:
100% routine factory testing; optional type and special tests upon request

Certifications:
CE, ISO9001, ISO14001, ISO45001, RoHS (available upon request)

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Advantages of 20–24 kV Class Pad-Mounted Transformers

• High-capacity, oil-immersed design for MV loads

• Suitable for longer feeders and higher fault levels

• Weather-resistant enclosure for harsh environments

• Maintenance-free sealed construction

• Flexible configurations for diverse project needs

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Choose CHBEB

Choose CHBEB 20–24 kV Class Pad-Mounted Transformers for efficient, secure, and field-proven distribution performance. With decades of manufacturing experience, CHBEB supports global utility, industrial, and energy clients with customizable pad-mounted transformer solutions.

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👉 Technical Specifications:
Please refer to the table below for detailed specifications of our 20–24 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