Complaint
1.Product introduction
Three-phase high-voltage power transformers can be widely used in industry, such as start spot welding machine, automatic welding machine, butt welding machine, straightening machine, steel wire rolling machine, diffusion welding machine, seam welding, roll welding, touch welding, row welding machine etc.
2. Normal operating conditions
Three-phase high-voltage power transformer should be able to work normally under the following conditions:
a) Altitude: not more than 1000m;
b) Ambient temperature: -15 ºC ~ + 40 ºC
c) The relative humidity of the air does not exceed 95% (at + 25 ºC);
d) In a gas or steam environment without damage to insulation;
e) Used in explosive environment without methane coal dust.
3. Product parameters
| Item | Descirption | Offered |
| 1 | General information | |
| 1.1 | Supplier | Markevina China |
| 1.2 | Place of manufacture | China |
| 2 | Type of transformer | Core, Outdoor, Oil immersed |
| 3 | Continuous ratings Capacitor | 33.333MVA |
| 4 | Phase | 1 |
| 5 | Cooling Type | ONAF |
| 6 | Rated voltage on principal tapping | 138/13.8kV |
| 7 | Rated frequency | 60Hz |
| 8 | Vector Group(After three single-phase transformers are connected externally) | YNd11 |
| 9 | Tap-changers | |
| 9.1 | Type | OLTC |
| 9.2 | Maker | Guizhou Changzheng |
| 9.3 | Model | ZM Model |
| 9.4 | Preclse electrical location of tappings | HV |
| 9.5 | Tapping range of HV/LV ratio % of the ratio on the principal tapping | |
| 9.5.1 | Max | 10% |
| 9.5.2 | Min | 10% |
| 9.6 | Number of steps | 17 steps |
| 9.7 | Size of steps | 1.25% |
| 10 | Ohmic impedance at 75ºC and rated frequency based on maximum rated power of HV winding | |
| 10.1 | On principal tapping | 10.50% |
| 10.2 | On extreme plus tapping | 11% |
| 10.3 | On extreme minus tapping | 10% |
| 11 | Temperature rises | |
| 11.1 | Top oil (thermometer) | 55K |
| 11.2 | Winding(by resistance) | 65K |
| 12 | No-load loss on principal tapping at ratings | 32kW |
| 13 | load loss at ratings | 108kW |
| 14 | Impulse withstand test voltage for(1.2/50us) | |
| 14.1 | HV | 650kV(peak) |
| 14.2 | LV | 95kV(peak) |
| 14.3 | HV of Netural point | 325kV |
| 15 | Sixty-second, power-frequency withstand test voltage | |
| 15.1 | HV | 275kV(rms) |
| 15.2 | LV | 28kV(rms) |
| 15.3 | HV of Netural point | 140kV |
| 16 | Main terminal bushings | |
| 16.1 | Impulse withstand test voltage at sea level(1.2/50us) | |
| 16.1.1 | HV | 650(peak) |
| 16.1.2 | LV | 125(peak) |
| 16.1.3 | HV of Netural point | 325kV |
| 16.2 | Sixty-second,power-frequency withstand test voltage to earth | |
| 16.2.1 | HV | 275kV(rms) |
| 16.2.2 | LV | 50kV(rms) |
| 16.2.3 | HV of Netural point | 140kV |
| 17 | Approx. Mass | |
| 17.1 | Core &coils | 21700kg |
| 17.2 | Mass of oil | 10400kg |
| 17.3 | Total mass | 48600kg |
| 17.4 | Shipping mass for heaviest part | 39500kg |
| 18 | Filling medium for transport | Oil |
| 19 | Overall dimensions of heaviest part | |
| Length*Width*Height | 4500*2200*3200 | |
| 20 | Overall dimensions of complete transformer | |
| Length*Width*Height | 4700*5300*5700 | |
