L4 Four lamps Waterproof
Scheme and connection group of windings is optional: Dyn0,Dyn5,Dyn11,YY0 etc. according to customer demand it is possible to make transformers with different connection of the Voltage s and other construction solution.
Service environment:
a) Air temperature: Maximum temperature: +40℃; Minimum temperature: -25℃.
b) Humidity: Monthly average humidity 95%; Daily average humidity 90%.
c) Altitude above sea level: Maximum installation altitude: 2500m.
d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
e) No frequent violent shake.
Features:
1. Energy saved :
Compared with old type S7, no-load loss decreases 10.25% averagely and on-load current decreases 37.9%, which means 18.39% operation cost is reduced.
2. Long-term reliable service life:
Fully enclosed transformer tank and rim shall be bolted together or welded firmly. Isolation between oil and air keeps insulation away from moisture, which lowers insulation aging and improves service life.
3. Free from untanking:
Free from untanking before operation, so its cost is saved.
4. Free from maintenance
5. Low noise:
Impacted structure in design, new material and new technology adopted and low noise.
6. Small size and artistic appearance:
Owing to the corrugated plate used for radiation, oil volume is changed by adjustment and compensation through expansion and shrinkage of corrugated plate when the temperature of oil is changed. Corrugated tank is small size in good looking.
1. Energy conserving
Compared with the original S9 type, no-load loss of S11 decreases by 10.25% averagely, no-load current decreases by 37.9%, and the running expense decreases by 18.9% averagely.
2. High reliability
Structurally improve the effective supporting of both HV and LV coil end faces, adopt the new body location structure. Expand the application scope of the cylindrical coil, and adopt a series of new material, new subassembly, new fastening pieces and new process to make both the performance of the product and structure reach up to higher level, improve the running reliability of the product.
3. The service life is prolonged
Compact structure, small volume, low noise, high efficiency and steady performance of S11 series of transformers prolong the service life of transformers.
S11 series of oil-immersed transformers produced by our company are low loss series of products that have international advanced level. The energy conserving effect is significant. They can be widely used in urban and countryside industrial and agricultural power grid. The iron core adopts the new process of the stepping lamination, resulting in improvement in no-load performance and reduction in noise.
Transformers are equipment which convert the voltage transmitted by the grid to lower voltage as required by the system or load. Amorphous alloy transformers are widely used in the distribution systems of urban and rural areas. The main feature of the product is that it can significantly reduce no-load loss of transformers, and is especially suitable for areas which lack power, have a fluctuating load, low load rate, or hard to perform daily maintenance. Because the insulating medium cannot easily be polluted by air due to the full seal structure, the transformer can be operated in humid environments, which is ideal distribution equipment for urban and rural grids. The products will save energy and decrease pollution to the atmosphere effectively if they are widely installed and operated properly.
Working conditions:
Transformer cores are made of amorphous alloy strips, with no-load loss 70% lower than the current S11 types. Its performance parameters comply with the requirements of GB/T25446-2010 standards.
The LV winding of the transformer is foil wound, which increases the mechanicalintensity of windings and improves the ability of transformers to endure short circuits.
The connection symbol of the transformer is Dyn11, decreasing the impact of harmonic wave on the grid and improving the quality of power supply.
We adopt a full seal structure in oil tanks of transformers, preventing the insulating medium from coming into contact with the air, prolonging the use life of products and increasing the operational reliability of transformers.
The transformer uses vacuum oiling, which can eliminate the bubble in windings completely, and ensure stable and reliable insulation performance.
To ensure transformers can be operated safely and reliably, we will carry out a full wave thunderbolt surging test on each transformer at a peak value voltage which is 25% higher than that of the national standards. (We don’t have the ability to do a surging test currently.)
Because the acceptability of amorphous alloy cores to mechanical intensity and the mechanical strength of rectangle wirings are weak, it is difficult to pass the test for short circuit of amorphous alloy transformers successfully in the transformer field. Our company overcame the difficulty with our mature technical expertise and experiences, which indicates the transformer design and manufacture technology of our company is among the best in the domestic transformer industry.
Insulation Level of the Product
Voltage |
Max RMS voltage of transformer kV |
Rated short-time power frequency RMS withstand voltage kV/min |
Rated lightning impulse withstand voltage full-wave (peak) kV |
≤1 |
≤1.1 |
5 |
/ |
6 |
7.2 |
25 |
75 |
10 |
12 |
35 |
95 |
20 |
24 |
50 |
120 |
Product Standards
GB1094.1-1996 Power Transformer Part I General Rules
GB1094.2-1996 Power Transformer Part II Temperature Rise
GB1094.3-2003 Power Transformer Part III Insulation level, insulation test andexternal insulation air gap
GB1094.5-2003 Power Transformer Part V Ability to withstand short-circuit
GB/T25446-2010 Technology parameters and requirements for oil-immersed amorphous alloy distribution transformer
GB/T22072-2008 Technology parameters and requirements for dry-type amorphous alloy core distribution transformer
GB1094.11-2007 Dry-type power transformer
IEC 60076 Power transformer