1-4 Introduction and Specifications Date Code 20001006
SEL-351 Instruction Manual
Section 4: Loss-of-Potential, Load Encroachment, and Directional Element Logic
describes the operation of:
• Loss-of-potential logic and its effect on directional elements
• Load-encroachment logic and its application to phase 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
• Communications-assisted trip logic
• Front-panel target LEDs
Most tripping applications (not requiring switch-onto-fault or communications-
assisted tripping) require only SELOGIC
®
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 reclosures
• 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 (IN1 through IN8 - model 0351xT; IN101 through IN106 -
models 0351x0, 0351x1, and 0351xY; IN201 through IN208 - models 0351x1 and
0351xY)
• Local control switches (local bit outputs LB1 through LB8)
• Remote control switches (remote bit outputs RB1 through RB8)
• Latch control switches (latch bit outputs LT1 through LT8)
• Multiple setting groups (six available)
• Programmable timers (timer outputs SV1T through SV16T)
• Output contacts (OUT1 through OUT11 and ALARM - model 0351xT; OUT101
through OUT107 and ALARM - models 0351x0, 0351x1, and 0351xY; OUT201
through OUT 212 - models 0351x1 and 0351xY)
• Rotating default displays
Courtesy of NationalSwitchgear.com
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