SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Contents
6. TECHNICAL DATA 66
6.1 Input ratings 66
6.2 Impedance setting ranges 66
6.3 Resistive reach setting range (quadrilateral earth fault units only) 67
6.4 Lenticular aspect ratio setting range (lenticular zone 3 only) 67
6.5 Summary of K-factors 67
6.6 Accuracy of impedance measurement 68
6.7 Current sensitivity of impedance measuring units. 68
6.8 Returning ratio of impedance measuring units 68
6.9 Characteristic angle setting ranges and accuracy 68
6.10 Timer setting ranges 69
6.11 Polarising 69
6.12 Switch-on-to-fault 69
6.13 Operating and reset times 70
6.14 Voltage transformer (fuse failure) supervision 70
6.15 Power swing blocking 70
6.16 Operative ambient temperature range 70
6.17 Operative frequency range 70
6.18 Burdens and current transformer requirements 71
6.19 Output contact ranges 71
6.20 DC supply ratings and operative range 72
6.21 Auxiliary dc supply for optically-coupled isolators 72
6.22 DC power consumption 72
6.23 Inbuilt continuouys monitoring and periodic self-test 72
6.24 Voltage withstand 72
6.25 Environmental withstand 73
6.26 Dimensions 73
APPENDIX A
Figure 1: Quadramho 1
Figure 2: Quadramho module earthing arrangement 2
Figure 3: Outline drawing and module layout 3
Figure 4: Block diagram 4
Figure 5: Voltage input module RFV04 5
Figure 6: Action of switched bandpass filter in voltage supply 6
Figure 7: AC current input module RFC15 7
Figure 8: Nameplate details RFC15 8
Figure 9: Level detectors ZH0729 9
Figure 10: Board ZH0730 phase and neutral and IR setting 10
Figure 11: Nameplate details RRZ07 11
Figure 12: Zone 1/Zone 2 setting board ZH0732 12
Figure 13: Zone 1/Zone 2 comparators (MHO version) 13
Figure 14: Zone 1/Zone 2 comparators (Quad version) 14
Figure 15: Layout of ULA 15
Figure 16: Comparator inputs 16
Figure 17: Nameplate details RRM08 17
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