11kV Cast Resin Dry Type Distribution Transformer

1.Improve electrical performance: low losses, low noise, low partial discharge, high-efficiency safe operation on 100% humidity.
2.Safety Operation: epoxy resin and insulating materials are the major material of our product，self-extinguishing and flameproof, no blast, no pollution, non-poison air, high moisture resistance, safe operation under 100% humidity, and other bad service environments
3.Simplify or free maintenance: durable and tiny design makes it easy to do quick check and cleaning process.
4.Lower operating costs: high moisture resistance and lower losses, less need for maintenance..

Product Parameters:

Technical characteristics for 630kVA 11 kV cast resin dry type transformer

Transformer  type	Cast resin dry type transformer
Transformer Model	630kVA 11/0.4kV
Short circuit impedance	6%
Noise Level	50dB
Cooling mode	AN/AF
Winding material	Copper/Aluminum
Degree of protection	IP00
HV tapping	+/-2*2.5%
Insulation material	Cast resin (HV) Pre-impregnated (LV)
Insulation level	Primary:  28kV AC Secondary: 3kV AC
BIL	75kV for primary circuit
Type of installation	Indoor
Maximum attitude	<1000m
Standards	IEC60076-11

Core:
1. The core is made of high quality grain-oriented cold-rollled silicon steel of high magnetic conductivity, by using 45°five-step overlapping method to reduce the no-load loss and no-load current.
2. Simulation analysis method is applied for the core design, thus to precisely and effectively calculate the vibration frequency and scale.
3. Flexible connections are adopted between the core and coils, core and clamps. With these measures, transformer’s noise level has been improved by 10-15dB over the conventional products.

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