ABB REG316 4 Series Operating Instructions Manual page 294

ABB Switzerland Ltd
· 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
Rotor grounding resistor R
Coupling capacitors
C = C + C
1 2
t
= R x C
Time constant
The grounding resistor R
=
injection current I
The coupling capacitors must be designed for the maximum
excitation voltage.
3-256
REG 316*4 1MRB520049-Uen / Rev. F
: 150 W £ R
pr
: 900 W £ R
Er
: 2 m £ £
F C 10
t
£ £
: 3 ms 10
Er
must be continuously rated for the
pr
50 V
.
R
pr
£ 500 W
pr
£ 5 k W
Er
m
F
ms