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Date Code 20090715 SEL-421 Relay
Table of Contents
Ethernet Card............................................................................................................................................... A.7.4
Direct Networking Example........................................................................................................................ A.7.7
Reference Manual
Section 1: Protection Functions
Current and Voltage Source Selection..........................................................................................................R.1.2
Frequency Estimation .................................................................................................................................R.1.15
Time-Error Calculation...............................................................................................................................R.1.16
Fault Location.............................................................................................................................................R.1.18
Open Phase Detection Logic ......................................................................................................................R.1.20
Pole Open Logic.........................................................................................................................................R.1.20
Loss-of-Potential Logic..............................................................................................................................R.1.23
Fault Type Identification Selection Logic ..................................................................................................R.1.27
Ground Directional Element.......................................................................................................................R.1.27
Phase and Negative-Sequence Directional Elements .................................................................................R.1.38
Directionality..............................................................................................................................................R.1.39
CVT Transient Detection............................................................................................................................R.1.40
Series-Compensation Line Logic ...............................................................................................................R.1.41
Load-Encroachment Logic .........................................................................................................................R.1.42
Out-of-Step Logic.......................................................................................................................................R.1.43
Mho Ground Distance Elements ................................................................................................................R.1.49
Quadrilateral Ground Distance Elements...................................................................................................R.1.54
Mho Phase Distance Elements ...................................................................................................................R.1.58
Zone Time Delay ........................................................................................................................................R.1.61
Instantaneous Line Overcurrent Elements..................................................................................................R.1.64
Inverse-Time Overcurrent Elements...........................................................................................................R.1.70
Switch-Onto-Fault Logic............................................................................................................................R.1.84
Communications-Assisted Tripping Logic.................................................................................................R.1.87
Directional Comparison Blocking Scheme ................................................................................................R.1.88
Permissive Overreaching Transfer Tripping Scheme.................................................................................R.1.91
Directional Comparison Unblocking Scheme Logic................................................................................R.1.100
Trip Logic .................................................................................................................................................R.1.105
Circuit Breaker Failure Protection............................................................................................................R.1.115
Section 2: Auto-Reclosing and Synchronism Check
Auto-Reclosing.............................................................................................................................................R.2.2
One-Circuit-Breaker Auto-Reclosing...........................................................................................................R.2.4
Two-Circuit-Breaker Auto-Reclosing ........................................................................................................R.2.10
Auto-Reclose Logic Diagrams ...................................................................................................................R.2.27
Manual Closing ..........................................................................................................................................R.2.41
Voltage Checks for Auto-Reclosing and Manual Closing..........................................................................R.2.44
Settings and Relay Word Bits for Auto-Reclosing and Manual Closing ...................................................R.2.46
Synchronism Check....................................................................................................................................R.2.50
Section 3: SELOGIC Control Equation Programming
SELOGIC Control Equation History .............................................................................................................R.3.1
Separation of Protection and Automation Areas ..........................................................................................R.3.2
SEL
OGIC Control Equation Programming ...................................................................................................R.3.4
SEL
OGIC Control Equation Setting Structure ..............................................................................................R.3.6
Multiple Setting Groups ...............................................................................................................................R.3.8
SEL
OGIC Control Equation Capacity .........................................................................................................R.3.11
SEL
OGIC Control Equation Elements.........................................................................................................R.3.12
SEL
OGIC Control Equation Operators........................................................................................................R.3.25
Effective Programming...............................................................................................................................R.3.35
SEL-311 and SEL-351 Series Users...........................................................................................................R.3.37
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