Measurements and Recording
P74x/EN MR/N
1, P742, P743
(MR) 8-
CONTENTS
1. INTRODUCTION 3
2. EVENT & FAULT RECORDS 4
2.1 “View Recods” Column (P741) 4
2.2 “View Records” Column (P742 / P743) 5
2.3 Types of event 6
2.3.1 Change of state of opto-isolated inputs 6
2.3.2 Change of state of one or more output relay contacts 7
2.3.3 Relay alarm conditions 7
2.3.4 Alarm List 7
2.3.5 Protection element starts and trips 9
2.3.6 General events 9
2.3.7 Fault records 10
2.3.8 Maintenance reports 10
2.3.9 Setting changes 10
2.4 Resetting of event/fault records 10
2.5 Viewing event records via S1 support software 11
2.6 Event filtering 13
3. DISTURBANCE RECORDER 14
3.1 “Disturb recorder” column – Central Unit P741 14
3.2 “Disturb recorder” column – Peripheral Unit P742 or P743 15
4. MEASUREMENTS 17
4.1 Check Zone Phase Currents 17
4.2 Measured currents 17
4.3 Sequence voltages and currents 17
4.4 Settings 17
4.5 Measurement display quantities 17
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