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CONTENTS
SAFETY SECTION 7
1 DESCRIPTION 11
2 INSTALLATION 11
2.1 General 11
2.2 Unpacking 12
2.3 Storage 12
2.4 Site 12
3 COMMISSIONING 12
3.1 Commissioning preliminaries 12
3.2 Commissioning tests 13
4 APPLICATION NOTES 17
4.1 General 17
4.2 Matched line current transformers 17
4.3 Ratio and phase matching interposing transformers 18
4.4 Application of matching transformer 19
5 SETTINGS 23
DIAGRAMS
Flowchart 1 24
Flowchart 2 25
Flowchart 3 26
Flowchart 4 27
Flowchart 5 28
Flowchart 6 29
Figure 1 Connections for checking relay settings 30
Figure 2 Connections for checking relay operating time 30
Figure 3 Connections for checking the bias curve 31
Figure 4 MBCH 12/13/16 bias curve 32
Figure 5 Connections to the relay to simulate magnetizing inrush current
waveform 33
Figure 6 Mesh busbar arrangement requiring three bias inputs to the
differential relay 34
Figure 7 Three winding transformer – one power source 35
Figure 8 Switchgear arrangement where six bias inputs may be required 36
Figure 9 Example of a 30 MVA transformer with current flow indicated 37
Figure 10 Disposition of windings on matching transformer 38
Figure 11 Two winding transformer with unmatched line current transformers 39
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