Active Member
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[China]
Address: 21/F, Building 1, No. 816,Jinghua Road, Hi-tech Zone,Ningbo, Zhejiang, P.R. China
Contact name:Tony ma
Ningbo Tian'an Jinghua Power Technology Co., Ltd. |
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DC 252kv 125KA HV Disconnect Switch Loop Overheating Loop Overheating
General overview
GW23 (GT9) 252D/2500-50 Type Double Column Outdoor AC HV Disconnector is developed on the basis of aiming at existing defects about disconnector conducting loop overheating, operating mechanism failure, metal material corrosion serious, and then making great improvement.
DC 252kv 125KA HV Disconnect Switch Loop Overheating Loop
Overheating Characteristic:
1. Application of friction type contacting structure in main knife
moving conductive contact surface
2. Auto-locking device of breaking and closing positions
effectively prevents the separation of dynamic/static contacts due to wind or electric motive force
3. The application of non-oil bearing and copper alloy sleeve on
rotating point making it have auto-lubrication function and conquers the corrosion and seizure of the rotating
point
4. Application of advanced surface processing technique and
anti-rust aluminum, stainless steel greatly enhances surface anti-rust property
5. Three-pole linkage and electric/manual operation of main switch
6. Fitted with earthing switch that has the same short-circuit
current withstand capability as disconnector
7. Effective prevention of mal-operation by electric/mechanical
dual interlock between disconnector and earthing switch
DC 252kv 125KA HV Disconnect Switch Loop Overheating Loop Overheating Technical parameters
| S/N | Name | Unit | Parameters | |
| 1 | Rated voltage | kV | 252 | |
| 2 | Rated current | A | 2500 | |
| 3 | Peak withstand current of disconnector and earthing switch (peak) | kA | 125 | |
| 4 | 3s short-time withstand current of disconnector and earthing switch (r.m.s) | kA | 50 | |
| 5 | Main circuit resistance of disconnector | μΩ | ≤130 | |
| 6 | 1min power frequency withstand voltage(r.m.s) | Phase-to earth(dry, wet) | kV | 395 |
| Fracture | 460 | |||
| 7 | Lightning impulse withstand voltage (1.2/50μs) | Phase-to earth | kV | 950 |
| Fracture | 1050 | |||
| 8 | Mechanical endurance test of disconnector and earthing switch | Times | 2000 for each | |
