Schweitzer Engineering Laboratories, Inc. SEL-487E-3, -4 Data Sheet
23
Models and Options
Depending on the number of interface boards, the SEL-487E
is available in 5U (no interface boards), 6U (one inter-
face board), 7U (two interface boards), or 9U size (four
interface boards) (U is one rack unit in height—44.45 mm
or 1.75 in). Select I/O boards from a choice of four inter-
face boards, each board designed to provide a wide range
of input and output combinations to tailor the relay for
your specific application. If your application requires
more I/O, add contact I/O with the SEL-2505/SEL-2506
Remote I/O Module.
Firmware Options
The SEL-487E comes in two different ordering options:
Transformer Protection Relay (SEL-487E-3) and Station
Phasor Measurement Unit (SEL-487E-4). The only dif-
ference between the two options is the front overlay labeling.
On the SEL-487E-3, the front overlay reads “Protection
Automation Control.” On the SEL-487E-4, the front
overlay reads “Station Phasor Measurement Unit.” All
the relay functionality is the same in the two versions.
Current Channel Options
Select the CT secondary current for any one of the five
windings (S, T, U, W, X) from 1 A or 5 A (all three phases
1 A or 5 A). For neutral windings (the three inputs of
Winding Y), you can separately select the CT secondary
current for each of the three inputs. For example, select
5 A secondary currents for the three phases of Winding S,
5 A secondary currents for the three phases of Winding T,
1 A secondary currents for the three phases of Winding U,
5 A secondary current for REF 1 (first neutral current
input), and 1 A secondary current for REF 2 (second
neutral current input). When Winding Y is ordered with
matching rated nominal current inputs, you can use that
terminal as a sixth set of three-phase CT inputs: IAY,
IBY, and ICY.
Although each three-phase winding (S, T, U, W, and X)
can be either 1 A or 5 A, and the Y-windings either 1 A
or 5 A on a per-phase basis, the SEL-487E supports only
the combinations shown in Table 5.
Figure 32 Dimensions for Rack- and Panel-Mount Models
15.72
(399.3)
12.75
(323.9)
17.15
(435.6)
15.60
(396.2)
4.75
(120.6)
FOUR I/O
BOARD (9U)
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