Item | Description | SHZVIII | SHZVI |
1 | Max. rated through current (A) | 400 | 600 | 1000 | 1300 | 400 | 600 | 1000 | 1200 | 1500 | 1600 | 2400 | 3000 |
2 | Rated frequency (Hz) | 50 or 60 |
3 | Connection | 3-phase Y-connection for neutral point only | Single-phase for any selectable winding connection |
4 | Max. rated step voltage (V) | 4000 |
5 | Rated step capacity | 1500 | 1600 | 3000 | 3300 | 1500 | 1600 | 3000 | 3000 | 4000 | 4400 | 5600 | 6000 |
6 | Short-circuit current test (kA) | Thermal (3s) | 6 | 8 | 12 | 15 | 6 | 8 | 12 | 24 | 24 | 24 | 24 | 30 |
Dynamic (peak) | 15 | 20 | 30 | 37.5 | 15 | 20 | 30 | 60 | 60 | 60 | 60 | 75 |
7 | Max. operating positions | 35 without change-over selector; 107 with change-over selector |
8 | Insulation to ground | The highest voltage for equipment (kV) | 72.5 | 126 | 170 | 252 |
Rated separate source AC withstand voltage (kV/50Hz,1min) | 140 | 230 | 350 | 460 |
Rated lightning impulse withstand voltage (kV,1.2/50μs | 350 | 550 | 750 | 1050 |
9 | Tap selector | Categorized into B, C, D & DE four sizes |
10 | Mechanical life | Not less than 1,500,000 operations |
11 | Electrical life | Not less than 600,000 operations |
12 | Oil compartment of diverter switch | Service pressure | 0.03 MPa |
Leakage test | No leakage under 0.08 MPa for 24 hours |
Over pressure protection | Rupture disc bursts at 300 ± 20% KPa |
Protective relay | Set oil flow speed at 1.0m/s ± 10% |
13 | Motor drive unit | SHM-D or CMA7 |