SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Page 63 of 74
Test Signal Equivalent Function Equivalent
socket (active low) LED auxiliary
pin relay
SK2–25 SK A IND A Trip for fault on A phase
SK2–24 SK B IND B Trip for fault on B phase
SK2–23 SK C IND C Trip for fault on C phase
SK2–22 SK Z2 IND Z2 Trip for fault in Zone 2 Z2–1
SK2–21 SK Z3 IND Z3 Trip for fault in Zone 3 Z3–1
SK2–20 SK AT IND Aided Trip Aided Trip 94Y–1
SK2–19 SK SOTF IND SOTF Switch on to fault trip 98–1
SK2–18 SK FF IND V~FAIL Fuse failure 97X–1
SK2–17 SK CTX Signal send output 85X–1, 85X–2
SK2–16 SK + 12V + 12V supply rail
SK2–15 SK – 12V –12V supply rail
SK2–14 SK + 5V +5V supply rail
SK2–13 SK BAR Block auto reclose output 96–1
SK2–12 SK TRIP 3PH 3 phase trip signal issued 94T–1. 94T–2
SK2–11 SK ANY TRIP Trip signal issued by 94–1, 94–2
distance relay
SK2–10 SK PSB ANN PSB Output of power swing 95–1
blocking feature
SK2–9 SK CRX ANN Signal receive opto energised
SK2–8 SK MEM EN Memory feature enabled
SK2–7 SK TPS Output of PSB 50ms timer
SK2–6 SK ANY Any comparator operated
Z1/Z2/Z3 (except PSB)
SK2–5 SK SOTF EN SOTF enabled
SK2–4 SK MCK/28 Master clock/28 = 3.6Hz @ 50Hz,
SK2–3 SK 24V 24V supply rail 4.32kHz @ 60Hz
SK2–2 SK 0V Zero volt common
SK2–1 SK INH MR Short to SK2–2 to
inhibit relays
Auxiliary relay module – normal scheme option operations only
Table 9: Test Points
5.16.43 Operation of Quadramho with capacitor voltage transformers
For reasons of economy, capacitor voltage transformers (CVT) are often used in
preference to electro-magnetic voltage transformers on high voltage transmission
systems. Although the steady state performance of CVT is generally good, the
transient response can be poor. As distance relays operate under dynamic
conditions following a fault, before steady state conditions are obtained, the
transient response of CVT is an important consideration.
To Next Page
Loading...