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230kV Three Phase Oil-immersed Auto Power Transformer
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230kV Three Phase Oil-immersed Auto Power Transformer Product Details：
General:
High voltage power transformer ratio ranges from 90kV to 330kV are the main products of CTSS which have many advantages both on quality and price. All the products has been fully tested and certificated before delivery. Plenty of our products have been exported and applied in oversea markets regarding power plant, substation, mineral and ore industries.
Standards:
Ø IEC-76 .1-1993 Power Transformers: general
Ø IEC-76 .2-1993 Power Transformers: temperature rise
Ø IEC-60076-3: 2000 Power Transformers Insulation levels, dielectric tests and external clearances in air
Ø IEC60076-4-2002 Power Transformers part4 guide to the lighting impulse and switching impulse testing-power transformers and reactors
Ø IEC-60076-5:2000 Power Transformers ability to withstand short circuit
Ø JB/T3837-1996 Approaches for Editing Type of Transformer
Ø GB1094.1.2-1996 Manufacturing Standard of Power Transformer
Ø GB1094.3.5-2003 Manufacturing Standard of Power Transformer
Ø GB/T 6451-2008 Technical Parameters and Requirements of the Three-phase Oil-immersed Power Transformer
Techniques:
Design: relative developed softwares are adopted in Electromagnetic calculations, Strength analysis, Leakage magnetic distribution, its electro-dynamic force and Electrical insulation.
Manufacture:
Ø Core: effectively upgrade transformer’s no-load performance by below methods:
· Adopt high-quality silicon steels
· Three-phase-three-limb or three-phase-five-limb drawing plate structure
· D type yoke to keep large space for winding and Germany imported cutter makes sure the burr of core less than 20μm
· Meanwhile, appropriate magnetic flux density and the auto-oscillation frequency of cores are selected for lowering transformer’s sound level.
Ø Winding:
· Optimize winding transposing to effectively reduce load losses and eddy current losses as well.
· Oil partition plate and oil duct to lower average temperature rise and the hot-spot temperature rise and thereby extend transformer’s service life.
Ø Core structural parts: decrease the stray losses by lowering eddy current losses, drawing plates of core or minimizing slots on the basis of the location of core structural parts.
Features:
Ø Low loss: No-load loss is 40% lower and on-load loss is 15% lower than required in GB6451-1999 National standard.
Ø Low noise: Less than 60dB, which can be reached to less than 58 is special requirements is indicated.
Ø Low partial discharge: strictly insist the no-dust work and blunt all the metallic parts and insulation parts to make sure the partial discharge of110kV ratio transformer less than 100pc and 200kV ratio transformer less than 70pc.
Ø Strong mechanical strength and short-circuit withstand ability: winding inner hard support, double dovetail block, upper and lower insulation are integrated press plate.
Ø Pretty outline and compact structure
Ø 100% guaranteed no leakage
Brief specification:
Ø Voltage class: 90kV to 330kV
Ø Capacity: 6300～420000kVA
Ø Short circuit impedance: 7-24%
Ø No load current: ＜0.15~0.3%
Ø Losses: no-load losses is fully comply with IEC standard requirements
Typical specification:
Ø Model: 320000-230kV
Ø Rated voltage:230kV
Ø Rated Capacity:320000kVA
Ø Type: Three Phases, OLTC, Auto Power Transformer, Three Windings
Application: 90-330kV power system of power plant, substation, mining enterprise and etc.
CTSS catalogue is available as per request.
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