ABB REG316 4 Series - Page 294

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-256
· Open the HMC menu ‘Editor’ and the sub-menu ‘Present
prot funcs’, and enter and save the value of the simulated
ground fault for ‘RFr-Adjust’ and the nominal value for
REr.
Open the menu ‘Display function measurements’ and note
the value of ‘REr’. Enter and save the value noted for the
setting of ‘REr’ in the ‘Present prot funcs’ window.
· Remove the short-circuit from across the coupling capaci-
tors and remove the simulated ground fault.
· Remove the logical ‘1’ from the binary input ‘AdjRErInp’.
Determination of C
· Apply a logical ‘1’ to the binary input ‘AdjCoupCInp’.
· Ground the rotor winding (Rf = 0 W).
· Enter and save the value the nominal value of C, in the
sub-menu ‘Present prot funcs’.
Open the menu ‘Display function measurements’ and note
the value of Ck. Enter and save the value noted for the set-
ting of ‘CouplingCapC’ in the window ‘Present prot funcs’.
· Remove the simulated ground fault from the rotor.
· Remove the logical ‘1’ from the binary input
‘AdjCoupCInp’.
Design instructions:
The grounding resistors and coupling capacitors have to fulfil the
following conditions:
Rotor grounding resistor R
pr
: 150 W £ R
pr
£ 500 W
Rotor grounding resistor R
Er
: 900 W £ R
Er
£ 5 kW
Coupling capacitors
C = C
1
+ C
2
: 210
m
m
FC F££
Time constant t = R
x
C
Er
: 310ms ms££t
The grounding resistor R
pr
must be continuously rated for the
injection current
I
V
R
pr
=
50
.
The coupling capacitors must be designed for the maximum
excitation voltage.