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SEL-311C Relay Instruction Manual Date Code 20060320
Table of Contents
Out-of-Step Characteristics............................................................................................................................3.22
Use SEL-321 Relay Application Guides for the SEL-311C .................................................................3.22
Instantaneous/Definite-Time Overcurrent Elements......................................................................................3.26
Phase Instantaneous/Definite-Time Overcurrent Elements ...................................................................3.26
Residual Ground Instantaneous/Definite-Time Overcurrent Elements .................................................3.28
Negative-Sequence Instantaneous/Definite-Time Overcurrent Elements .............................................3.30
Time-Overcurrent Elements...........................................................................................................................3.33
Phase Time-Overcurrent Elements ........................................................................................................3.33
Residual Ground Time-Overcurrent Element ........................................................................................3.36
Negative-Sequence Time-Overcurrent Element ....................................................................................3.38
Voltage Elements ...........................................................................................................................................3.40
Voltage Values .......................................................................................................................................3.40
Voltage Element Settings .......................................................................................................................3.40
Voltage Element Operation ....................................................................................................................3.42
Synchronism Check Elements .......................................................................................................................3.44
Fixed Angle Synchronism Check ..........................................................................................................3.44
Dynamic Synchronism Check ...............................................................................................................3.44
Synchronism Check Elements Settings .................................................................................................3.45
Synchronism Check Elements Voltage Inputs .......................................................................................3.48
Synchronism Check Elements Operation ..............................................................................................3.48
Synchronism Check Applications for Automatic Reclosing and Manual Closing ................................3.54
Frequency Elements.......................................................................................................................................3.55
Frequency Element Settings ..................................................................................................................3.55
Frequency Element Operation ...............................................................................................................3.58
Frequency Element Uses .......................................................................................................................3.59
Section 4: Loss-of-Potential, CCVT Transient Detection, Load-Encroachment, and
Directional Element Logic
Loss-of-Potential Logic ...................................................................................................................................4.1
Setting ELOP = Y or Y1 ..........................................................................................................................4.2
Setting ELOP = Y ....................................................................................................................................4.2
Setting ELOP = N ....................................................................................................................................4.3
CCVT Transient Detection Logic....................................................................................................................4.4
Load-Encroachment Logic ..............................................................................................................................4.5
Settings Ranges ........................................................................................................................................4.6
Load-Encroachment Setting Example .....................................................................................................4.6
Use SEL-321 Relay Application Guide for the SEL-311C .....................................................................4.8
Directional Control for Ground Distance and Residual Ground Overcurrent Elements .................................4.9
Directional Element Enables .................................................................................................................4.10
Best Choice Ground Directional Logic .................................................................................................4.10
Directional Elements .............................................................................................................................4.10
Directional Element Routing .................................................................................................................4.10
Directional Control for Phase Distance and Negative-Sequence Elements...................................................4.17
Internal Enables .....................................................................................................................................4.17
Directional Elements .............................................................................................................................4.17
Directional Element Routing .................................................................................................................4.18
Directional Control Settings ..........................................................................................................................4.21
Settings Made Automatically ................................................................................................................4.21
Settings ..................................................................................................................................................4.21
Overcurrent Directional Control Provided by Torque Control Settings ........................................................4.28
Section 5: Trip and Target Logic
Trip Logic ........................................................................................................................................................5.1
Set Trip ....................................................................................................................................................5.3
Unlatch Trip .............................................................................................................................................5.4
Factory Settings Example (Using Setting TR) ........................................................................................5.4
Additional Settings Examples .................................................................................................................5.5
Program an Output Contact for Tripping .................................................................................................5.6
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