Cable Feeder Unit(D)
This unit is also known as an incoming cable feeder unit or outgoing cable feeder unit. A three-position disconnector is supplied as an optional accessory.
Cable Feeder Unit(D)
The ASNA cable feeder unit(symbol: D) is designed to connect cables to the horizontal busbars of adjacent switchgears. It consists of a cable compartment and a busbar compartment. This unit is also known as an incoming cable feeder unit or outgoing cable feeder unit. A three-position disconnector is supplied as an optional accessory.
Core functions
When a D unit fitted with a three-position switch is coupled with circuit breaker switchgear (D+B), an interlock mechanism shall be fitted to prevent the disconnector from being operated under load. Operating logic: The disconnector shall be closed prior to closing the circuit breaker; the circuit breaker shall be opened prior to opening the disconnector.
Lightning arresters may be supplied as optional components for suppression of circuit switching overvoltages and lightning surges.
Temperature sensors can be installed optionally to enable real-time temperature monitoring within the cable compartment.
Parameter List
| Name | Unit | Parameter | |||
| Rated voltage(Ur) | kV | 24 | |||
| Rated frequency(fr) | Hz | 50 | |||
| Rated current(lr) | A | 630 | 1250 | ||
| Rated Short-duration power-frequency withstand voltage(Ud) | Common value | kV | 50 | ||
| Across the isolating distance | 60 | ||||
| Rated Lightning impulse withstand voltage(up) | Common value | kV | 125 | ||
| Across the isolating distance | 145 | ||||
| Rated short-time withstand current(lk) | kA | 20 | 25 | ||
| Rated short-time duration(tk) | s | 4 | |||
| Rated peak withstand current(lp) | kA | 50 | 63 | ||
| Rated short-circuit breaking current(lsc) | kA | 20 | 25 | ||
| Rated short-circuit making current(lma) | Three-position disconnector | kA | 50 | 63 | |
| Mechanical endurance | Three-position disconnector | time | 3000 | ||
| Electrical endurance | Earthing Switch | class | E2 | ||
| Degree of protection by enclosure | IP4X | ||||
| Degree of protection by Fully Sealed tank | IP65 | ||||
| Dimension Low voltage chamber not included | W(mm) | 550 | 600 | ||
| D(mm) | 850 | ||||
| H(mm) | 1890,17001) | 1940 | |||
1) 1700mm is the solution for the low cable room.
| Name | Unit | Parameter | ||
| Rated voltage(Ur) | kV | 12 | ||
| Rated frequency(fr) | Hz | 50 | ||
| Rated continuous current(lr) | A | 630 | 1250 | |
| Rated short-duration power-frequency withstand voltage(Ud) | Common value | kV | 28 | |
| Across the isolating distance | 32 | |||
| Rated lightning impulse withstand voltage(Up) | Common value | kV | 75 | |
| Across the isolating distance | 85 | |||
| Rated short-time withstand current(Ik) | kA | 20 /25 | 20/25/31.5 | |
| Rated short-time of short-circuit(tk) | s | 4 | ||
| Rated peak withstand current(Ip) | kA | 50 / 63 | 50/63/80 | |
| Rated short-circuit breaking current(Isc) | kA | 20 / 25 | 20/25/31.5 | |
| Rated short-circuit making current(Ima) | Three-position disconnector | kA | 50 / 63 | 50/63/80 |
| Mechanical endurance | Three-position disconnector | time | 3000 | |
| Electrical endurance | Earthing Switch | class | E2 | |
| Degree of protection by enclosure | IP 4X | |||
| Degree of protection by fully sealed tank | IP 65 | |||
| Dimensions Low voltage chamber not included |
W(mm) | 460 | 550 | |
| D(mm) | 800 | 900 | ||
| H(mm) | 1640 | 1810 | ||
1) and 2): The 900mm and 1810mm are the sizes used to be match the 1250A switchgear.
Application
Questions and answered
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