SERVICE MANUAL R5888B
QUADRAMHO Chapter 1
Contents
1. GENERAL 1
2. RELAY CHARACTERISTICS 1
3. SCHEMES AVAILABLE ON RELAY 1
4. CHOICE OF CHARACTERISTIC 2
5. CHOICE OF ZONE 1 IMPEDANCE REACH 2
6. CHOICE OF ZONE 2 IMPEDANCE REACH 2
7. CHOICE OF ZONE 3 IMPEDANCE REACH 3
8. POWER SWING BLOCKING FEATURE (PSB) 4
9. CHOICE OF RESISTIVE REACH OF QUADRILATERAL CHARACTERISTIC 4
10. AUTOMATIC COMPENSATION OF QUADRILATERAL REACH
LINE ANGLE 4
11. CHOICE OF ASPECT RATIO (LENTICULAR ZONE 3 CHARACTERISTIC) 5
12. CHOICE OF RELAY CHARACTERISTIC ANGLES 5
13. ZONE TIME DELAY SETTINGS 5
14. SWITCH-ON-TO-FAULT TRIPPING FEATURE (SOTF) 5
14.1 Performance of relay for earth faults 6
15. SELECTION OF SCHEME LOGIC PROGRAMS 7
16. SETTING OF SCHEME OPTION SWITCHES 7
17. DISCUSSION ON APPLICATION OF VARIOUS DISTANCE SCHEME
OPTIONS 7
17.1 Basic (see Figure 3) 7
17.2 Zone 1 extension (see Figure 4) 8
17.3 Permissive underreach transfer tripping (PUR – see Figure 5) 8
17.4 Permissive overreach transfer tripping (POR – see Figures 6 and 7) 8
17.5 Blocking (see Figure 8) 9
18. TIMER SETTINGS FOR DISTANCE SCHEME LOGIC OF QUADRAMHO 9
18.1 Permissive underreach scheme 9
18.2 Permissive overreach scheme 10
18.3 Blocking scheme 11
19. CURRENT TRANSFORMER REQUIREMENTS 12
19.1 Worked example No. 1 12
19.2 Data 13
19.3 Calculation of maximum and minimum source impedance at MAY 60kV 13
19.4 Selecting Zone 1 reach 14
19.5 Selecting Zone 2 reach 15
19.6 Selecting Zone 3 reach 15
19.7 Ground fault compensation settings 16
19.8 Setting restrictive reach of ground fault comparators 17
19.9 Checking minimum relay voltage for a fault at the Zone 1 reach point 17
19.10 Checking relay current sensitivity for faults at the Zone 3 reach point 18
19.11 Sketching relay characteristics 19
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