Audited Supplier
Summary:SRM- 12/24 series of ring main unit is SF6 gas- insulated metal common tank enclosed switchgear, consisting of load break switch unit, load break switch fuse combination electrical unit, vacuum circuit breaker unit, and the incoming line unit of bus. It adopts a range of advanced technologies and materials, with excellent electrical and mechanical properties, less affected by environment and climate, in small size, easy to install easy to operate, with no need of maintenance, and can be flexibly combined. Its clear and intuitive design ensures simple and direct operation, the feeder's connection capacity is large, suitable for a variety of wiring systems.
Specification
ltem | Unit | Load break switch unit | Combination apparatus | Fuse unit | |
Rated voltage | kV | 12/24 | 12/24 | 12/24 | |
Rated frequency | Hz | 50 | 50 | 50 | |
Rated current | A | 630 | Depend on rated current of fuse | 630 | |
P.F.withstand voltage (phase to phase.phase to earth) | kV | 42/65 | 42/65 | 42/65 | |
Ated insulation levels | P.F.withstand voltage(Across open contacts) | 48/79 | 48/79 | 48/79 | |
P.F.withstand voltage (Control and auxiliary circuit) | 2/2 | 2/2 | 2/2 | ||
Lightning impulse withstand voltage (phase to phase, phase to earth) | 75/125 | 75/125 | 75/125 | ||
Across open contacts | 85/145 | 85/145 | 85/145 | ||
Ogauge pressure test | - | Pass | Pass | Pass | |
Rated short time withstand current | kA | 20/4s/20/3s | - | 20/4s/20/4s | |
Rated peak withstand current | kA | 63 | -- | 63 | |
Rated short circuit making current | kA | 50 or 63 | Subject to high-voltage fuse | 50 | |
Rated short circuit breaking current | kA | - | Subject to high-voltage fuse | 20/20 | |
Rated transform current | A | - | 1750/1400 | - | |
Rated active load breaking current | A | 630 | - | - | |
Rated Closed loop breaking current | A | 630 | - | 630 | |
Mechanical life | Load break switch/breaker | Time | 5000 | 5000 | 10000 |
Isolating switch/earthing switch | 5000 | 5000 | 5000 | ||
Loop resistance | μΩ | ≤120 | - | ≤120 | |
Inflation pressure | Rated inflation pressure(absolute pressure) | bar | 1.3 | 1.3 | 1.3 |
Minimum inflation pressure(absolute pressure) | 1.2 | 1.2 | 1.2 | ||
Relative rate leakage of gas | % | ≤0.02 | ≤0.02 | ≤0.02 | |
