What Are 33kV / 35kV Dry Type Transformers?

33kV / 35kV dry type transformers are high-voltage cast resin transformers designed for primary or sub-transmission level power distribution. Unlike oil-filled transformers, they use epoxy resin to encapsulate the windings, offering flame-retardant, maintenance-free, and environmentally safe operation.

These transformers are ideal for use in regional substations, industrial zones, railways, airports, and other large-scale infrastructure where oil-free and fire-resistant equipment is required.

Why Use 33kV / 35kV Dry Type Transformers?

Fire Safety:
Resin-encapsulated windings are non-flammable and self-extinguishing, eliminating the risk of fire and oil leakage—perfect for densely populated, enclosed, or high-risk areas.

Durability:
With high mechanical strength, robust insulation, and resistance to moisture and pollution, these transformers offer over 20–30 years of reliable performance even in harsh environments.

Energy Efficiency:
Built with low-loss silicon steel cores and optimized copper/aluminum windings, these transformers comply with IEC 60076-11 and other international efficiency standards.

Key Features of 33kV / 35kV Dry Type Transformers

Construction:
High-quality cold-rolled silicon steel cores combined with precision cast copper or aluminum windings ensure low partial discharge, low noise, and excellent thermal performance.

Cooling System:
Standard AN (Air Natural) cooling, with optional AF (Air Forced) for higher capacity units. No oil or liquid cooling needed.

Protection and Monitoring:
Equipped with temperature sensors (PT100), thermal relays, optional fans, and smart monitoring devices to protect against overheating or overloads.

Noise Control:
Engineered to operate below 60 dB, suitable for public infrastructure installations with strict acoustic requirements.

Environmental Adaptability:
Available in IP23–IP44 enclosures for indoor and semi-outdoor use; resistant to humidity, dust, and corrosive gases.

Applications of 33kV / 35kV Dry Type Transformers

• Primary distribution in regional and municipal substations

• Railways, airports, tunnels, and metro systems

• Heavy industrial plants and infrastructure

• Renewable energy facilities (wind farms, hydro stations)

• Government and public utility projects with strict safety standards

Standards and Compliance

International Standards:
IEC 60076-11, ANSI/IEEE C57.12.01, GB/T 10228, CSA, AS

Testing:
Routine testing according to IEC/IEEE standards; optional type and special tests available

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

Advantages of 33kV / 35kV Dry Type Transformers

• Oil-free and environmentally safe

• Fire-resistant and explosion-proof design

• Suitable for indoor and enclosed installations

• Long service life with minimal maintenance

• Customizable voltage ratios, impedance, and enclosure types

Choose CHBEB

Choose CHBEB 33kV / 35kV dry type transformers for safe, efficient, and maintenance-free high-voltage power distribution. With over 60 years of manufacturing experience, CHBEB supports global clients with high-performance dry type transformer solutions tailored to complex project requirements.

👉 Technical Specifications:
Please refer to the table below for detailed specifications of our 33kV / 35kV Series Dry Type Transformers:

Rated capacity (KVA)	Rated Voltage(KV)			Coupling group		Loss(W)		No-load current(%)	Noise (B)
	HV	Tap change	LV		Impedance voltage(%)	N0-load	Load
800	35 or 38.5	±5% or ±2×2.5%	3.15,6 ,6.3,10 10.5 or 11	Yyn0 Dyn11	6	2220	8180	0.6	50
1000						2640	9480		52
1250						3090	11210
1600						3640	13440	0.5	53
2000					7	4180	15830		54
2500						4800	18970		56
3150					8	5960	21280	0.4
4000						6930	25570		55
5000						8270	30350		58
6300						9780	35460	0.3
8000					9	11200	40000
10000						12800	48250
12500						15560	56080	0.2	60
16000						19110	65980		61
20000					10	22670	74230		62