ABB THF 1BS Series, Installation And Operation Instruction Manual

Page: 9 / 12

8 9 8
Current transformer KORE06F1600/1THF
Relay settings as factory settings in the above table:
- K4 relay setting 5 gives 50/60 Hz max. current: 300A
- K5 relay setting 1 gives 150/180 Hz max. current: 50A
The reaction time 0,5...0,7 sec.
After the connection to the network
Amp-meter is connected in the secondary circuit of the T1 Current transformer. It is equip-
ped with %-scale where 100% indication corresponds the nominal primary current of T1
Current transformer. When the THF-filter is connected the meter indicates mainly the
50/60Hz unbalance current which flows in the N/PEN- wire. When the THF-filter is bypassed
the meter indicates mainly the 3rd harmonic current.
2. The indicator light functions
3. Resetting of a protective unit
4. The indicator light functions in Test-actions
1. Find out the reason why a protective unit has been activated and correct the fault.
- The reason for an unbalance current may be a blown fuse in main circuit.
2. Check by ‘Test’-action that a protective unit is working properly.
3. Push ‘Reset’ -button.
- If the protective unit is activated again the reason has not been sorted out.
Note!
Check that when the load is running the ‘’OK’’- light is ON.
Otherwise see the checklist in page 9.
Example:
1. Amp-meter
In all other indicator light combinations, by-pass a THF-unit manually, by connecting
INPUT- and OUTPUT- terminals! Contact to a local ABB representative!