Schweitzer Engineering Laboratories SEL-352-1 - SECTION 5: CONTROL LOGIC

Date Code 20010731 Control Logic i
SEL-352-1, -2 Instruction Manual
TABLE OF CONTENTS
SECTION 5: CONTROL LOGIC ........................................................ 5-1
Signal Processing ......................................................................................................................... 5-1
Frequency Tracking Specification........................................................................................ 5-1
Relay Logic Overview.................................................................................................................. 5-1
Relay Word Bits and SELOGIC
®
Control Equations .................................................................... 5-2
Relay Word Bits ................................................................................................................... 5-2
SELOGIC Control Equations................................................................................................. 5-5
SELOGIC Control Equation Analog Compares............................................................. 5-6
Limitations of SELOGIC Control Equations ................................................................. 5-7
SELOGIC Control Equation Set A Example.......................................................... 5-8
SELOGIC Control Equation Operators Example................................................... 5-8
Processing Order and Processing Interval............................................................................ 5-9
Fixed Analog Comparisons ........................................................................................................5-10
Optoisolated Inputs..................................................................................................................... 5-11
Input Assignment Variables ....................................................................................................... 5-12
52A, MODST ..................................................................................................................... 5-12
LOD .................................................................................................................................... 5-12
Multiple Setting Groups (SS1, SS2)................................................................................... 5-13
TRIP.................................................................................................................................... 5-13
CLOSE, MCLOSE ............................................................................................................. 5-13
Local Control Switches (LB1—LB16) ...................................................................................... 5-13
Remote Control Switches (RB1—RB16)................................................................................... 5-14
Remote Bit Application...................................................................................................... 5-14
Remote Bit States Not Retained When Power Is Lost ....................................................... 5-15
Remote Bit States Retained When Settings Changed or Active Setting Group
Changed ...................................................................................................................... 5-15
SELOGIC Control Equation Set A .............................................................................................. 5-15
Timers (62T1A, 62T1B, and 62T1C)................................................................................. 5-15
Latch Control Switches ...................................................................................................... 5-16
SELOGIC Control Equation Variables ................................................................................ 5-16
SELOGIC Control Equation Set B............................................................................................... 5-16
Timers (62T2A, 62T2B, 62T2C and 62T3A, 62T3B, 62T3C) .......................................... 5-16
Latch Control Switches ...................................................................................................... 5-17
SELOGIC Control Equation Variables ................................................................................ 5-17
Output Contacts.......................................................................................................................... 5-17
Rotating Default Display............................................................................................................ 5-17
LED Targeting Logic ................................................................................................................. 5-18
EN Target LED...................................................................................................................5-18
PF Target LED.................................................................................................................... 5-19
86BFT Target LED............................................................................................................. 5-20
86RS Target LED ............................................................................................................... 5-20
TRIP Target LED ............................................................................................................... 5-21
CLOSE Target LED ........................................................................................................... 5-21
52A Target LED ................................................................................................................. 5-22
A, B, and C Target LEDs.................................................................................................... 5-22