4.103
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Group Settings (SET Command)
Figure 4.64 Inverse Time-Undervoltage Element Curves
Inverse-Time
Overvoltage
Protection
There are four inverse-time overvoltage elements (59I) available. Based on
relay hardware options and settings, the 59I element offers the flexibility of
using various analog quantities as operating quantities. The availability of
these analog quantities is contingent on the settings DELTA_Y, VSCONN,
and SINGLEV, as indicated in Tab le 4.39.
Time Dial = 1
Time Dial = 2
Time Dial = 5
Time Dial = 10
Time Dial = 1
Time Dial = 2
Time Dial = 5
Time Dial = 10
Curve A Curve B
Multiples of Pickup Multiples of Pickup
Time in Seconds
Time in Seconds
Table 4.39 Operating Quantities for the 59I Element
Settings Operating Quantities Available in 59InOQ Setting Range
a
DELTA_Y VSCONN SINGLEV VAB VBC VCA VA VB VC VG V1 3V2 3V0 VS MAXLL MAXLN
DELTA 3V0 N # # # ———— # # # — # —
DELTA 3V0 Y # ———————— # — — —
DELTA VS N # # # ———— # # — # # —
DELTA VS Y # ————————— # — —
WYE VS N $$$######—# $ #
WYE VS Y ——— # ———
—
—— # — —
WYE 3V0 N $$$#######— $ #
WYE 3V0 Y ——— # ————— # — — —
# = 2.00–300.00 V $ = 2.00–520.00 V — Operating quantity is not available
The "#" and "$" signs indicate the setting range for 59InP (n = 1, 2, 3, or 4).
a
The physical meanings of the operating quantities are described as follows:
VAB: Magnitude of A-to-B phase voltage V1: Magnitude of positive-sequence voltage
VBC: Magnitude of B-to-C phase voltage 3V2: Magnitude of negative-sequence voltage
VCA: Magnitude of C-to-A phase voltage 3V0: Magnitude of measured zero-sequence voltage from VS channel
VA: Magnitude of A-phase voltage VS: Magnitude of Vsync voltage
VB: Magnitude of B-phase voltage MAXLL: Magnitude of the maximum phase-to-phase voltage
VC: Magnitude of C-phase voltage MAXLN: Magnitude of the maximum phase-to-neutral voltage
VG: Magnitude of zero-sequence voltage
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