ABB Relion 670 series, Technical Reference Manual

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Summation block 3 phase 3PHSUM....................................................114
Introduction......................................................................................114
Principle of operation.......................................................................114
Function block.................................................................................115
Input and output signals..................................................................115
Setting parameters..........................................................................115
Authority status ATHSTAT....................................................................116
Introduction......................................................................................116
Principle of operation.......................................................................116
Function block.................................................................................117
Output signals..................................................................................117
Setting parameters..........................................................................117
Denial of service DOS..........................................................................117
Introduction......................................................................................117
Principle of operation.......................................................................117
Function blocks................................................................................118
Signals.............................................................................................118
Settings............................................................................................119
Section 5 Differential protection........................................................121
Line differential protection.....................................................................121
Introduction......................................................................................122
Line differential protection, 3 or 6 CT sets L3CPDIF,
L6CPDIF.....................................................................................122
Line differential protection 3 or 6 CT sets, with in-zone
transformers LT3CPDIF, LT6CPDIF..........................................124
Analog signal transfer for line differential protection...................124
Principle of operation.......................................................................126
Algorithm and logic.....................................................................126
Time synchronization..................................................................134
Analog signal communication for line differential protection.......135
Open CT detection feature.........................................................138
Binary signal transfer..................................................................140
Line differential coordination function LDLPDIF (87L)................140
Function block.................................................................................141
Input and output signals..................................................................145
Setting parameters..........................................................................150
Technical data.................................................................................160
1Ph High impedance differential protection HZPDIF (87).....................161
Identification....................................................................................161
Table of contents
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Technical reference manual