Power Transformer with OLTC

Power Transformerwith OLTC 2.1.Name: Three-phase windings OLTC dual immersion air-cooled power transformers 2-2.Item: SFZ-40000/33 2-3.Rated voltage: 33/6.9kv 2-4.Rated power: 3500,40000kva 2-5.Rated voltage ratio: 33±3×2.5%/6.9kV 2-6.Rated currency:700,3347A 2-7.PHASE: THREE PHASE 2-8.Rated Frequency:50HZ 2-9.Connection Symbol:Dyn11 2-10.Tap changer: on load tap changer 2-11.Impedance voltage%: 13.8% 2-12.Cooling way: ONAN/ONAF 2-13.Winding Insulation Level Lightning impulse withstand voltage(Kv, peak value)1 min Frequency Pressure(kv, virtual value) Full-wave Latest wave HIGH voltage SIDE 17018575low voltage side758535Low-voltage neutral point 7535 2-14.Insulation class2-15.Transformer windings of the Inter-field strength is not more than 2 Kv / mm2-16.Transformer loss (below 75 ), the no-load current and efficiencyNo-load loss: 21 kWLoad loss: 198 Kw No-load current: 0.5%2-17. Radio frequency interference and Corona To the greatest work of the voltage, outdoor sunny evening out line without visible Corona, radio interference voltage is not more than 2500 uV2-18.Overload capacityShort-term overload transformer overload capacity and operating hours are as followsOvercurrent(%) 30456075100 Allowed to run time 12080452010 2-19.Over-excitation capability (nominal frequency): Operation Unladen Load Overvoltage multiples Phase - Phase1.11.21.051.11.251.50Phase - earth1.11.21.051.11.251.80Allowed to run timeContinuous30 minutescontinuous20 minutes20sec1sec2-20.Short-circuit the ability to bearin any location of the tap, the transformer should be able to bear the external short circuit for 2sec, the Parts should without damage or deformation Winding, However The short-circuit winding average temperature should not exceed 250 . 2-21. Temperature Limit: Winding 65KOil surface 55k Oil box and Structure parts 80k Iron Core 80K 2-22.Transformer without car, sent size is 2000 mm × 1435mm (vertical x horizontal). 2-23.Noise level: 65 dB noise (measurement method in accordance with international)