SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Contents
Figure 60: Power swing blocking logic 52
Figure 61: Flux summation in transphasor 53
Figure 63: Voltage transformer supervision and miniature circuit breaker 54
Figure 64: Level detector pole dead logic 55
Figure 65: Level detector gating of comparators 56
Figure 66: Bandpass filter switching logic 57
Figure 67: External connection diagram:
Quadramho static distance protection relay
1 and 3-phase tripping 58
Figure 68: Permissive underreach scheme 59
Figure 69: Permissive overreach scheme 60
Figure 70: Week infeed feature POR scheme 61
Figure 71: Blocking scheme 62
Figure 72: Trip output logic 63
Figure 73: Block auto-reclose logic 64
Figure 74: Fault locator logic 65
Figure 75: Switch on to fault logic 66
Figure 76: Indication logic 67
Figure 77: Some test features of Quadramho 68
Figure 78: Zone 1 typical operating times for 50Hz relays at SIR 30 69
Figure 79: Zone 1 typical operating times for 60Hz relays at SIR 1 70
Figure 80: Zone 1 typical operating times for 60Hz relays at SIR 1 71
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