Schweitzer Engineering Laboratories SEL-421-4 - Table 5.66 Available Input Quantities; Figure 5.89 Overvoltage Elements

5.114
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Over- and Undervoltage Elements
Although each under- and overvoltage element offers two levels, only Level 1 has
a timer. If your application requires a time delay for the Level 2 elements, use a
programmable timer to delay the output.
Select any one of the voltage elements from Table 5 .6 6 as an input quantity. You
can select the same quantity for the undervoltage element as for an overvoltage
element.
Under- and Overvoltage Settings
E59 (Enable Overvoltage Elements)
Select the number of overvoltage elements (1–6) you require for your
application.
Figure 5.89 Overvoltage Elements
Table 5.66 Available Input Quantities
Voltage Quantity Description
VAFIM Filtered instantaneous A-Phase voltage magnitude
VBFIM Filtered instantaneous B-Phase voltage magnitude
VCFIM Filtered instantaneous C-Phase voltage magnitude
V1FIM Filtered instantaneous positive-sequence voltage magnitude
VNMAXF Maximum phase-to-neutral voltage magnitude
VNMINF Minimum phase-to-neutral voltage magnitude
VPMAXF Maximum phase-to-phase voltage magnitude
VPMINF Minimum phase-to-phase voltage magnitude
3V2FIM
a
a
These quantities are only available for the overvoltage (59) elements.
Filtered instantaneous negative-sequence voltage magnitude
3V0FIM
a
Filtered instantaneous zero-sequence voltage magnitude
59On
(Setting)
59TCn
(SEL
OGIC)
59PnP1
(Setting)
S
1
S
1
59nP1
59O1Q
Operational
Quantity
n = 1 – 6
59PnP2
(Setting)
59nP2
59nP1T
Overvoltage Timer
0
0
1
1
59PnD1
0
Setting Prompt Range Default Category
E59 Enable Overvoltage Elements N, 1–6 N Group