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Introduction and Specifications
Date Code 20011205
SEL-311B Instruction Manual
·
Load-encroachment logic and its application to phase distance and overcurrent
elements
·
Voltage-polarized and current-polarized directional elements
·
Best Choice Ground Directional
™
logic and automatic settings
Section 5: Trip and Target Logic
describes the operation of:
·
General trip logic
·
Switch-Onto-Fault trip logic
·
Front-panel target LEDs
Most tripping applications (not requiring switch-onto-fault tripping) require only
SEL
OGIC
®
control equation trip setting TR and unlatch trip setting ULTR in the general
trip logic (see Figure 5.1).
Section 6: Close and Reclose Logic
describes the close logic operation for:
·
Automatic reclosing
·
Other close conditions (e.g., manual close initiation via serial port or optoisolated
inputs)
Section 7: Inputs, Outputs, Timers, and Other Control Logic
describes the operation of:
·
Optoisolated inputs IN101 through IN106
·
Local control switches (local bit outputs LB1 through LB16)
·
Remote control switches (remote bit outputs RB1 through RB16)
·
Latch control switches (latch bit outputs LT1 through LT16)
·
Multiple setting groups (six available)
·
Programmable timers (timer outputs SV1T through SV16T)
·
Output contacts OUT101 through OUT107 and ALARM
·
Rotating default displays and display points
Section 8: Breaker Monitor and Metering Functions
describes the operation of:
·
Breaker monitor
·
Station dc monitor
·
Demand and maximum/minimum metering
Section 9: Setting the Relay
explains how to enter settings and also contains the following
setting reference information:
·
Time-overcurrent curves (5 US and 5 IEC curves)
·
Relay Word bit table and definitions (Relay Word bits are used in SEL
OGIC
control
equation settings)
Summary of Contents for SEL-311B
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