66KV 69KV 110KV 220KV Three Phase Oil immersed Power Transformer
Product Description
Description about Three Phase Oil immersed Power Transformer
1- high stability, low loss,excellent short-circuit ability
2- low partial discharge:partial discharge is always less than100pC
3- low noise: transformers up to 63MVA is1ower than 60dB
Detailed Photos
Introduction to Production Process
About electromagnetism calculation
To calculate the insulation strength based on comprehensive consideration of the impulse voltage gradient and the action time.
To minimize the mechanical stress by accurate of the coil magnetic field using analytic mirror method and calculating the ampere turn balance between the coil according each disc winding.
Calculate the wave and field strength of the electric field to ensure enough strength of the main insulation and vertical insulation under voltage acting.
To calculate the temperature rise of the core and the coil by computer program. The accuracy of the core calculation is to each step and the accuracy of the winding calculation is to each disc winding.
About Transformer winding
Generally the H.V Winding is of inter leaved and continuous winding to improve the performance under impulse voltage and obtain uniform distribution voltage. The pressboard spacers are rounded at the edges so as to improve insulation reliability Oil flowing within the winding will be able to lower the coil temperature rise and hot-spot temperature thus ensuring a prolonged insulating service life.
Both the H.V and M.V. winding are generally provided with separate voltage regulating windings, so the ampere turns of all the windings are completely balanced. These can effectively eliminating the axial electrodynamics force during external short circuit and improve the dynamic stability under external short circuit.
Bell-jar type tank is most commonly used the tank wall is made into a corrugated shape by heave press, This will reduce the welding work and the mechanical strength will be much improved Double oil resistant rubber synthetic gasket is provided between the flanges of the upper and lower tank Position limiting device usually be fixed on the flange of the lower tank.
High-grade cold-rolled grain-oriented silicon steel sheets are used for core plates. The core plates are made without holes to reduce no-load loss and the risk of core-bolt short . The sheets are cut by automatic cut-tolength line, insuring the burrs to be well below 0.02mm.The no-load loss of the transformer is reduced efficiently.
Shoring is used tighten the core and inner-winding. Iron yoke is strained by epoxy resin fiberglass rope.Besides, there are three fixation between the iron yoke and tank,so the body and tank are too tight to detach during transportation.
The cooling method of the transformer generally including oil natural circulation(ONAN)and air natural or forced circulation(ONAF).Transformers are designed to operate at full load when fans are in operation, and at 70% full load when fans shut down.Plate fin type radiators are used for cooling A more compact size can be obtained for transformers equipped with such radiators .The fans generally blow horizontally with low speed and low noise.The operation of fans be controlled by both the oil temperature and a control cabinet is installed on transformer tank.
Conservators are of diaphragm bag type.The bag is made of resistant airtight composite material, separating the air inside the bag and the oil outside. For further reliability, the air chamber of diaphragm bag is breathed through silica gel breather.
Product Parameters
Data Sheet for Three Phase Oil immersed Power Transformer
| Items |
Specifications |
| Origin |
China |
| Manufacturer |
Pearl Electric Co., Ltd. |
| Brand |
Pearl Electric |
| Production Descriptions |
66KV 69KV 110KV 220KV Three Phase Oil immersed Power Transformer |
| Reference standards |
10~150MVA |
| Frequency |
50 Hz or 60Hz |
| Voltage (HV) (kV) |
66KV 69KV 110KV 220KV |
| Voltage (LV) (kV) |
6.6KV 11KV 22KV 33KV |
| Impedance |
6-8% |
| Connections (Vector Group) |
YNd11 |
| Tapping Range |
on-load Tap Changer,
±8*1.25% on HV side |
| Core materials |
Silicon Steel |
| Winding materials |
Copper |
| Lightning Impulse Withstand Voltage |
IEC standard |
| AC withstand voltage |
IEC standard |
| Insulation Class |
A-class |
Certifications
Company Profile
Pearl Electric, located in Guangzhou, China, was founded in 1958 and is an outstanding power equipment supplier in the transmission and distribution industry. With a land area of 100000 square meters, over 600 employees, and an annual turnover of over USD 142 million, we currently have over 200000 transformers in operation, which have been sold to Southeast Asia, Central Asia, Africa, Europe, North America and other regions
Pearl Electric is devoted to providing safe, highly efficient and intelligent power transformation and distribution solution, focusing on R&D, manufacturing, sales and service as below:
1.Q: Are you manufacturer?
A: Yes, we are manufacturer. Our factory is in Guangzhou City, Guangdong Province.
2.Q: Do you have any Certificate?
A: Yes. Our transformer has awarded CE, UL, KEMA certificate. If you need any other Certificate, we can help you to apply it.
3.Q: How can I pay you?
A: Pay by T/T and L/C is acceptable.
4.Q: What about the production?
A: In general, it take 4~6weeks and it depend on the different style.
5. Q:How contact us to get quick inquiry ? Follow us in our company website.
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