Alstom SHPM 101 - Page 207

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 71 of 71
Figure 80: Zone 1 typical operating times for 60Hz relays at SIR 1
100
ms
70
60
50
40
30
20
10
0
020406080
Ground faults mho
% of relay setting
100
ms
70
60
50
40
30
20
10
0
020406080
Ground faults quadrilateral
% of relay setting
ms
70
60
50
40
30
20
10
0
020406080
3-phase faults mho
% of relay setting
ms
70
60
50
40
30
20
10
0
020406080
Phase faults mho
% of relay setting
100100
maximum
minimum