SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Contents
5.16.1 Purpose 47
5.16.2 Principle 48
5.16.3 Outputs 48
5.16.4 Level detector settings 48
5.16.5 Speed of operation 48
5.16.6 Implementation 48
5.16.7 Output seal-in 49
5.16.8 Operation for indication and alarm only 49
5.16.9 Resetting 49
5.16.10 Line de-energisation (line VTs) 49
5.16.11 Busbar voltage transformers 50
5.16.12 Single-pole tripping 50
5.16.13 Switch on to fault 50
5.16.14 Weak infeed (POR scheme option) during fuse failure conditions 50
5.16.15 Scheme logic module 51
5.16.16 Level detector pole dead logic 51
5.16.17 Comparator level detector checks 51
5.16.18 Voltage bandpass filter switching 51
5.16.19 Control of hysteresis in impedance measurement 51
5.16.20 Self testing 52
5.16.21 Operation of standard schemes and input/output interfaces 52
5.16.22 Standard scheme options 52
5.16.23 Basic scheme 53
5.16.24 Permissive underreaching scheme (PUR) 53
5.16.25 Permissive overreaching scheme (POR) 54
5.16.26 Weak infeed feature (POR scheme only) 54
5.16.27 Blocking scheme with reverse looking Zone 3 elements (BLOCK) 55
5.16.28 Zone 1 extension scheme (Z1EXT) 56
5.16.29 Opto-isolator inputs to scheme logic 56
5.16.30 Scheme logic control of auxiliary relay outputs 57
5.16.31 Trip A, Trip B and Trip C contacts 58
5.16.32 Trip three phase contacts 94T–1 and 94T–2 58
5.16.33 Any trip contacts 94–1 and 94–2 58
5.16.34 Block auto reclose contacts 96–1 58
5.16.35 Fault locator start contacts 19A–1, 19B–1, 19C–1 and 19E–1 59
5.16.36 Zone 2 trip contacts Z2–1 59
5.16.37 Zone 3 trip contact Z3–1 59
5.16.38 Aided trip contact 94Y–1 59
5.16.39 Switch on to fault contact 98–1 59
5.16.40 Relay inoperative alarm 97Y–1 61
5.16.41 Scheme logic control of indication 61
5.16.42 Test facilities 62
5.16.43 Operation of Quadramho with capacitor voltage transformers 63
5.16.44 Typical logic symbols used 65
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