12.2.4 Zone 3 Reach Check 669
12.2.5 Zone 4 Reach Check 669
12.2.6 Zone P Reach Check 669
12.2.7 Zone Q Reach Check 669
12.2.8 Resistive Reach 669
12.2.9 Load Blinder 670
12.3 Operation and Contact Assignment 670
12.3.1 Phase A 670
12.3.2 Phase B 670
12.3.3 Phase C 670
12.3.4 Time Delay Settings 671
12.4 Scheme Testing 671
12.4.1 Scheme Trip Test for Zone 1 Extension 672
12.4.2 Scheme Trip Tests for Permissive Schemes 672
12.4.3 Scheme Trip Tests for Blocking Scheme 672
12.4.4 Signal Send Test for Permissive Schemes 673
12.4.5 Signal Send Test for Blocking Scheme 673
12.4.6 Scheme Timer Settings 673
13 Delta Directional Comparison 674
13.1 Single-ended Testing 674
13.1.1 Preliminaries 674
13.1.2 Single-ended Injection Test 674
13.1.3 Forward Fault Preparation 674
13.2 Operation and Contact Assignment 675
13.2.1 Phase A 675
13.2.2 Phase B 675
13.2.3 Phase C 675
13.3 Delta Protection Scheme Testing 676
13.3.1 Signal Send Test for Permissive Schemes 676
13.3.2 Signal Send Test for Blocking Schemes 676
14 DEF Aided Schemes 677
14.1 Dependency Conditions 677
14.2 Earth Current Pilot Scheme 677
14.2.1 Preliminaries 678
14.2.2 Perform the Test 678
14.2.3 Forward Fault Trip Test 678
14.3 Scheme Testing 679
14.3.1 Signal Send Test for Permissive Schemes 679
14.3.2 Signal Send Test for Blocking Schemes 679
15 Out of Step Protection 680
15.1 OST Setting 680
15.2 Predictive OST Setting 681
15.3 Predictive and OST Setting 681
15.4 OST Timer Test 681
16 Protection Timing Checks 682
16.1 Dependency Conditions 682
16.2 Overcurrent Check 682
16.3 Connecting the Test Circuit 682
16.4 Performing the Test 683
16.5 Check the Operating Time 683
17 System Check and Check Synchronism 684
17.1 Check Synchronism Pass 684
17.2 Check Synchronism Fail 684
18 Check Trip and Autoreclose Cycle 685
19 End-to-End Communication Tests 686
19.1 Remove Local Loopbacks 686
19.1.1 Restoring Direct Fibre Connections 686
19.1.2 Restoring C37.94 Fibre Connections 687
P543i/P545i Contents
P54x1i-TM-EN-1 xix
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