1.7
Date Code 20080213 Instruction Manual SEL-351A Relay
Introduction and Specifications
Hardware Connection Features
Hardware Connection Features
See subsection Specifications on page 1.10 and Section 2: Installation for
more information on hardware and connections.
Dual Terminal Labels
For installation in systems with drawings designed for SEL-251 or SEL-267
relays, use the numeric terminal labels provided. See Figure 2.2, Figure 2.5,
and Figure 2.6 for a rear-panel drawing.
Channel IN
Table 4.1 and accompanying note show the particular ground directional
elements available with different options of the neutral channel (IN) current
input. Nondirectional sensitive earth fault (SEF) protection is also available
with the 0.2 A and 0.05 A nominal neutral channel (IN) current input options.
Voltage Inputs VA,
VB, VC
Firmware revisions numbered R105 or higher can be configured via global
setting PTCONN to accept either wye (line-to-neutral) or delta (line-to-line)
voltages using the open-delta connection. The relay rear-panel markings and
the internal connections of terminals Z09–Z12 are not changed. See Potential
Transformer Inputs on page 2.13 for details on the open-delta connection.
Auxiliary Voltage
Channel VS
The VS channel in firmware revisions numbered R105 or higher can be
configured via global setting VSCONN = VS to accept a synchronism check
or general-purpose voltage input or via VSCONN = 3V0 to accept a broken-
delta residual voltage connection. The relay rear-panel markings and the
internal connections of terminals Z13 and Z14 are not changed. See Potential
Transformer Inputs for details on the broken-delta connection.
NOTE: The VS channel is not
supported in the SEL-351A-1.
Courtesy of NationalSwitchgear.com
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