IEC 12KV 1250A Metal Enclosed Switchgear For Power Plants
Scope of useedit
It is widely used in various substations of power systems, power
plants, industrial and mining enterprises, and high-voltage power
distribution.
Working environment
1. Air temperature: -25℃~+40℃
2. Humidity: Monthly average humidity 95%; Daily average humidity
90% .
3. Altitude: ≤ 2500m
4. Ambient air not apparently polluted by corrosive and flammable
gas, vapor etc.
5. No frequent violent shake
Fully type-tested
The switchgear has undergone all the tests required by the
international (IEC) Standards. Each switchgear unit is subjected to
routine tests in the factory before delivery. These tests are
intended to provide a functional check of the switchgear based on
the specific characteristics of each installation.
Technical data
| No. | Item | Unit | Parameter |
| 1 | Rated voltage | kV | 3.6~24 |
| 2 | Rated frequency | Hz | 50/60 |
| 3 | Rated current | A | 630,1250,1600,2000,2500,3150,4000 |
| 4 | Branch busbar Rated current | 630,1250,1600,2000,2500,3150,4000 |
| 5 | Main busbar Rated current | 630,1250,1600,2000,2500,3150,4000 |
| 6 | 1min Power frequency withstand voltage | wet | KV | 38 | 50/60 |
| dry | 48 | 60/65 |
| 7 | Lightning impulse withstand voltage | kV | 75 | 95/125 |
| 8 | Rated short circuit breaking current (peak) | KA | 40/50/63/80/100 |
| 9 | Short time withstand current(4s) | 20/25/31.5/40 |
| 10 | Protection type | | IP4X for housing |
"Five Preventions" of High Voltage Switchgear
1. After the vacuum circuit breaker trolley in the high voltage
switch cabinet is closed at the test position, the trolley circuit
breaker cannot enter the working position. (Prevent closing with
load)
2. When the grounding knife in the high-voltage switch cabinet is
in the closed position, the trolley circuit breaker cannot be
closed. (Prevent closing with ground wire)
3. When the vacuum circuit breaker in the high-voltage switch
cabinet is closing, the back door of the cabinet should be locked
with the machine on the grounding knife. (Prevent the electrified
interval by mistake).
4. The vacuum circuit breaker in the high-voltage switchgear is
closed when it is working, and the grounding knife cannot be turned
on. (Prevent the live ground wire from hanging)
5. The vacuum circuit breaker in the high-voltage switch cabinet
cannot exit the working position of the trolley circuit breaker
when it is working and closed. (Prevent load broach)
