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Auto Section Switch
- Auto Section Switch(ASS)
- ASS is a line protection switch that minimizes blackout damage caused by malfunction. It cooperates with the backup protective device and blocks the fault section automatically. It is installed on the customer’s faucet penetration point in which the load capacity of the substation CB or recloser is below 4,000kVA (special load 2,000kVA) on a 22.9kV-y distribution line.
||Rated breaking current
||Rated closing current
|Rated short-time current
||15kA Instantaneous Asym
||Impulse withstand voltage
|10kA 1초 Sym
||Inrush current restraint time
||0.5, 1.0 sec
|3.5kA 10초 Sym
||Rated control voltage
|Minimum operation current
- Internal power charging system
- This function supplies an internal battery charging power on a 22900V line. There is no need to apply a separate AC 220V control power when installing the product
- Overcurrent protection
- Overcurrent is blocked according to a VI characteristic curve that is maintained for 3 seconds at 1.5 times the minimum operating current correction value.
- Charging Trip
- Momentary operation of the backup protection device enables an automatic trip while the fault current is removed (Does not open when ASS is in normal operation.).
- Inrush Current Restraint
- Prevents malfunction by restraining the inrush current from the transformer or motor.
- Overcurrent Lock
- The switch locks when abnormal rating lock current (800A) occurs. This function automatically separates the fault section by opening the ASS after blocking the backup protection device.
Operation properties and settings
- Minimum phase current
- Set to total load current of power facility x 1.5~2 times the current tap Example) 500kVA
- 500kVA × 1000 ÷ 22900V ÷√3＝12.6A × 1.5∼2 ≒ 20A
- Minimum ground current
- Set to half of the phase current correction value (10A). If the load unbalance rate is high, set to upper tap.
- Inrush current restraint time
- Set to 0.5 seconds. For load that has a long inrush current decay time (motors, etc.), set to 1.0 seconds.