Setting Guideline - ABB REG670 Applications Manual

1MRK 502 071-UEN -
9.16.3
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
these conditions is primarily a function of I
increases with current, it is logical to apply overcurrent elements with inverse time-
current characteristics. The generator overcurrent applications are complicated by the
complexity of generator thermal characteristics and the time-varying nature of current
experienced during starting and when the generator drives a time-varying load.
The generator rotor overload function GRPTTR protects rotor windings against
excessive temperature rise as result of overcurrents.

Setting guideline

Two setting examples will be given for two applications as shown in Figure 204.
100MVA
380/18kV
YNd5
500kVA
18/0,4kV
Dy5
1000/5
100MVA
G
18kV
3210A
a)
IEC12000182 V1 EN
Figure 204: Two application examples
First example (shown in a) is for a 100MVA machine and the second example (shown
in b) is for a 315MVA machine.
It is important to know which CT (that is, on HV or LV side of the excitation
transformer) is used. Make sure that appropriate CT ratio (for example, 100/1 or
1000/5) is set on these three analogue inputs.
All settings will be given in a table format for both applications.
2
R copper losses. Because temperature
320MVA
242/11kV
YNd5
100/1
315MVA
11kV
16533A
Field rating:
810A, 260V DC
Section 9
Current protection
100/5
1400kVA
11/0,55kV
Yd11
1500/5
G
Field rating:
1520A, 295V DC
b)
IEC12000182-1-en.vsd
401