SET.8
of 32
SEL-351A Settings Sheets
Relay Settings (Serial Port Command SET and Front Panel)
SEL-351A Relay Instruction Manual Date Code 20080213
Date________________
Electromechanical Reset (Y, N) 51QRS =
Load-Encroachment Elements (See Figure 4.2)
(Make the following settings if preceding enable setting ELOAD = Y.)
Forward load impedance
(0.10–128.00 Ω secondary {5 A nom.})
(0.50–640.00 Ω secondary {1 A nom.})
ZLF =
Reverse load impedance
(0.10–128.00 Ω secondary {5 A nom.})
(0.50–640.00 Ω secondary {1 A nom.})
ZLR =
Positive forward load angle (–90.00° to +90.00°)
PLAF =
Negative forward load angle (–90.00° to +90.00°)
NLAF =
Positive reverse load angle (+90.00° to +270.00°)
PLAR =
Negative reverse load angle (+90.00° to +270.00°)
NLAR =
Directional Elements (See Directional Control Settings (Not in SEL-351A-1) on
page 4.38)
(Make settings DIR1–DIR4 and ORDER if preceding enable setting E32 = Y or AUTO.)
Level 1 direction: Forward, Reverse, None (F, R, N) DIR1 =
Level 2 direction: Forward, Reverse, None (F, R, N)
DIR2 =
Level 3 direction: Forward, Reverse, None (F, R, N)
DIR3 =
Level 4 direction: Forward, Reverse, None (F, R, N)
DIR4 =
Ground directional element priority: combination of Q, V, I, P,
S, U, or OFF
ORDER =
(If neutral channel IN is rated 0.05 A or 0.20 A nominal, then setting option “I” is not available for setting ORDER.
Setting options “P,” “S,” and “U” are only available if neutral channel IN is rated 0.2 A nominal, and either global setting
PTCONN = WYE, or global setting VSCONN = 3V0.
Setting option “V” is only available if global setting PTCONN = WYE, or global setting VSCONN = 3V0.
When setting VNOM = OFF, and global setting VSCONN = VS, setting ORDER cannot contain “V,” “S,” “P,” or “U.”
When setting VNOM = OFF, setting ORDER cannot contain Q.
See Table 4.2 for permissible setting combinations for setting ORDER.)
(Make setting 50P32P if preceding enable settings E32 = Y or AUTO and ELOAD = N.)
Phase directional element 3-phase current pickup
(0.50–10.00 A {5 A nom.}, 0.10–2.00 A {1 A nom.})
50P32P =
(Make settings Z2F, Z2R, 50QFP, 50QRP, a2, and k2 if preceding enable setting E32 = Y. If E32 = AUTO, these settings are
made automatically.)
Forward directional Z2 threshold
(–128.00 to +128.00 Ω secondary {5 A nom.})
(–640.00 to +640.00 Ω secondary {1 A nom.})
Z2F =
Courtesy of NationalSwitchgear.com
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