The load switch MFZW32-40.5 is a three-phase load switch of an outdoor installation (open installation) of 35 kV that provides switching on and off under load (without damage) sections of a three-phase alternating current circuit, with earthed or isolated neutral in emergency conditions.
Rated current, A — 630, 1250
Rated voltage, kV — 35
The maximum operating voltage, kV — 40.5
Rated frequency, Hz — 50
Main Technical Parameter MFZW32-40.5:
| No | Name | Unit | Value | ||
| 1 | Rated voltage | KV | 40.5 | ||
| 2 | Rated current | A | 630 | ||
| 3 | Rated frequency | Hz | 50 | ||
| 4 | Rated peak withstand current | KA | 50 | ||
| 5 | Rated short time withstand current | KA | 20 | ||
| 6 | Rated short time withstand current duration | s | 4 | ||
| 7 | Rated active load breaking current | A | 630 | ||
| 8 | Rated closed loop breaking current | A | 630 | ||
| 9 | Rated cable charging breaking current | A | 10 | ||
| 10 | 5% rated active load breWng current | A | 31. 5 | ||
| 11 | Rated breaking capacLy of no-load transformer | KVA | 1250 | ||
| 12 | Rated short circuit closing current | KA | 50 | ||
| 13 | Major loop resistance | 卩Q | <95 | ||
| 14 | 1min power frequency withstand voltage(RMS) | Dry test | Pole-to-pole, pole-to earth | KV | 95 |
| Isolating fracture | 115 | ||||
| Wet test | Pole-to-pole, pole-to earth | 85 | |||
| 15 | Lightning impulse withstandvoltage (peak) | Pole-to-pole, pole-to earth | KV | 185 | |
| Isolating fracture | 215 | ||||
| 16 | Mechanical life | Times | 10000 | ||
| No | Name | Unit | Value |
| 17 | Three-phase opening/closing asynchronism | ms | <15 |
| 18 | Motor voltage and power | V W | £220 <200 |
| 19 | Contact knife breaking position deviation | mm | <5 |
| 20 | Main contact knife pressure | N | 420±42 |
| 21 | Clearance between contact knives | mm | >360 |
| 22 | Rated peak operating torque | Nm | <300 |
Operating Conditions of MFZW32-40.5
This load switch is composed of isolating switch, vacuum interrupter and operating mechanism and other parts. By using the principle of vacuum interrupter, with strong arcing ability, reliable performance, long service life, small volume, no explosion danger, no pollution. The product can be used in transmission and distribution system of electric power, metallurgy, mine, chemical industry and other departments as control equipment, especially suitable for frequent operation place.
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