Schweitzer Engineering Laboratories SEL-351 - Instruction Manual Sections Overview; Table 1.2: SEL-351 Firmware Versions

Date Code 20001006 Introduction and Specifications 1-3
SEL-351 Instruction Manual
Table 1.2: SEL-351 Firmware Versions
Model Number Firmware Version Relay Features
03510 0 Standard features.
03511 1 Standard features plus MIRRORED BITS™ and load
profiling.
SEL-351 Relays with firmware version 0 can be upgraded to firmware version 1. However,
SEL-351 Relays with firmware versions 0 and 1 cannot be upgraded to any higher firmware
versions. This is due to hardware limitations.
The wye-connected voltage inputs for SEL-351 Relays with firmware version 0 or 1 are rated
for voltages up to 150 Vac, line-to-neutral (channel VS, too).
The delta-connected voltage inputs for SEL-351 Relays with firmware version 0 or 1 are rated
for voltages up to 300 Vac, line-to-line (channel VS, too).
03512 2 Includes firmware version 1 features plus power
elements.
03513 3 Includes firmware version 1 features plus voltage
sag/swell/interruption elements.
03514 4 Includes firmware version 1 features plus power and
voltage sag/swell/interruption elements.
SEL-351 Relays with firmware versions 2, 3, or 4 come with wye-connected voltage inputs only
(connect any voltage up to 300 Vac, line-to-neutral).
INSTRUCTION MANUAL SECTIONS OVERVIEW
The following is an overview of the other sections in this instruction manual:
Section 2: Installation describes how to mount and wire the SEL-351 Relay. Connections
for numerous applications are described. The operation of circuit board jumpers is explained.
Figure 2.2 through Figure 2.5 show the SEL-351 Relay front and rear panels.
Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements
describes the operation of:
• Instantaneous/definite-time overcurrent elements (phase, neutral ground, residual
ground, and negative-sequence)
• Time-overcurrent elements (phase, neutral ground, residual ground, and negative-
sequence)
• Voltage elements (single-phase, phase-to-phase, etc.)
• Synchronism check elements
• Frequency elements
• Power Elements (in Firmware Versions 2 and 4)
• Voltage Sag/Swell/Interruption Elements (in Firmware Versions 3 and 4).
Courtesy of NationalSwitchgear.com