Epoxy Resin Cast Dry Type Distribution Transformer

Main features

Due to its unique structural features and excellent insulating materials, epoxy resin cast dry type distribution transformers possess the following notable advantages.
Oil-free, flame-retardant, fire-resistant: The interior does not contain insulating oil. It uses solid insulating materials such as epoxy resin, fundamentally eliminating the risks of fire, explosion and oil leakage.
Environmental safety: Free of toxic substances. Even if damaged, it will not pollute the environment.
Maintenance is simple: Unlike oil-immersed transformers, there is no need to regularly check the oil level and quality. The maintenance workload is small.
Flexible installation: It has low requirements for installation foundation and can be installed at the load center, thereby reducing line losses.
Resistant to moisture and dirt: The windings that have undergone special treatment possess excellent moisture-proof and corrosion-resistant properties.

Based on these characteristics, the application scenarios of epoxy resin cast dry-type distribution transformers are also very extensive.

Application

Commercial and civilian buildings: High-rise buildings, shopping centers, hospitals, schools, data centers, etc.
Public transportation and infrastructure: Airports, docks, subway stations, oil platforms, etc.
Industrial facilities: Factory workshops, CNC machinery equipment, etc. in areas with high fire prevention requirements.
New energy fields: Solar power, wind power, etc. green energy systems

Standard specification

1. Applicable specification: IEC 60076 / IEEE
2. Rated capacity : up to 4000 KVA
3. Primary voltage: up to 35kV
4. Secondary voltage: 380/400/415V or customized
5. Winding materials: Copper/ Aluminum
6. Temperature rise: 90 -100℃ or customized
7. Cooling method: ONAN8.Frequency: 50Hz/60Hz
9. Taps voltage: ±5% / ±2x2.5% or customized
10. vector group: Dyn11 / Yyn0 / Yd11

Insulation Class

Epoxy Resin Cast Dry Type Distribution Transformer have three general insulation classes. The main characteristic of insulation is to provide dielectric strength and withstand certain thermal limits. The insulation classes are

European Standard (IEC 60076):

Class A: Maximum winding temperature of 105°C.
Class E: Maximum winding temperature of 120°C.
Class B: Maximum winding temperature of 130°C.
Class F: Maximum winding temperature of 155°C.
Class H: Maximum winding temperature of 180°C.
Class C: Maximum winding temperature of 220°C.

American Standard (ANSI/IEEE C57.12.01):

Class 105: Maximum winding temperature of 105°C.
Class 150: Maximum winding temperature of 150°C.
Class 220: Maximum winding temperature of 220°C.

Package method

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Product application scenarios
Product technical parameters

Production

Test

Routine tests:

· Measurement of voltage ratio and check of phase-displacement
· Insulation resistance test
· Measurement of winding resistance
· Voltage withstand test
· Induce over-voltage withstand test
· Measurement of no-load loss and exciting current
· Measurement of short circuit impedance and Load loss
· Measurement of voltage ratio and check of phase-displacement
· Insulation resistance test
· Measurement of winding resistance
· Voltage withstand test
· Induce over-voltage withstand test
· Measurement of no-load loss and exciting current
· Measurement of short circuit impedance and Load loss

Type tests

· Lighting impulse test
· Temperature rise test