LS Industrial Systems Metasol Series - Lunbal - Current Unbalace Protection; OF - over Frequency Protection; Optional Relays for P,S Type - Vunbal, Lunbal, OFR, UFR; Vunbal - Voltage Unbalace Protection

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D
4. Relay Function
Optional Relays for P,S Type - Vunbal, Lunbal, OFR, UFR
1. Vunbal - Voltage Unbalace Protection
Off/Alarm/DO setting available when unbalance over set value occurs to 3P voltage.
1) Pickup setting: 6% ~ 99% (Step: 1%)
2) Delay Time: 1.2 ~ 40 sec (Step : 0.1 sec)
3) Relay error: Pickup value 2.5% or * 10%, Operating time 0.1 sec.
4) Calculating formula and Remark:
Voltage unbalance percentage = (Reverse phase voltage value)/(Normal voltage value)*100%
Relay voltage range: above 80V ~ less than 900V (Min. 1 phase among 3 phase)
2. Lunbal - Current Unbalace Protection
Off/Alarm/DO setting available when unbalance over set value occurs to 3P current.
1) Pickup setting: 6% ~ 99% (Step : 1% )
2) Pickup time delay setting: 1.2 ~ 40 sec (Step: 0.1 sec)
3) Relay error: Pickup value 2.5% or * 10%, Operating time 0.1sec.
4) Calculating formula and Remark:
Current unbalance percentage = (Negative phase current value)/(Normal voltage value)*100%
Relay current range: In (rated current) above 30% ~less than 120%
3. OF - Over Frequency Protection
Occurs when frequency of R phase voltage is above set value. Off/Alarm/DO setting available.
1) Pickup freq. setting (OF_pickup): UF_pickup
Note1
) ~ 65 (Step: 1Hz) / 60Hz system
Pickup freq. setting (OF_pickup): UF_pickup ~ 55 (Step: 1Hz) / 50Hz system
2) Pickup time delay setting (tof_pickup): 1.2 ~ 40 sec (Step: 0.1 sec)
3) Relay error: Pickup value 0.1Hz, Operating time 0.1sec
4) Calculating formula & Remark: relay voltage range: R phase voltage above 80V ~ less than 900V
4. UF - Under Frequency Protection
Occurs when frequency of R phase voltage is below set value. Off/Alarm/DO setting available.
1) Pickup freq. setting(UF_pickup): 55Hz ~ OF_pickup
Note2
) (Step:1Hz) / 60Hz system
Pickup freq. setting(UF_pickup): 45Hz ~ OF_pickup (Step:1Hz) / 50Hz system
2) Pickup time delay setting (tuf_pickup): 1.2 ~ 40 sec (Step:0.1 sec)
3) Relay error: Pickup value 0.1Hz, Operating time 0.1 sec
4) Calculating formula & Remark: relay voltage range: above 80V ~ less than 900V
Note 1) UF_PickUp - UFR Pickup setting voltage
2) OF_PickUp - OFR Pickup setting voltage
Digital Trip Relay