Woodward HighPROtec MCDLV4, Manual, Page: 601 / 1275

Protective Elements
Application Options Required Settings
ANSI 87L
– Line Differential Protection Note 1: For both protective devices the current input X3 must be
connected, and furthermore, the fiber optics must be connected
with each other's X102, and the “ProtCom” protection interface must
be configured.
In general the following parameters should be set to the same
values for both devices.
Set the Mode within the Device Planning.
⇨ Within [Device Planning]
⇨
Set
“
Transformer.Mode = not used”
Set the Differential Protection Parameters.
⇨
Within [Protection Para\Set [x]\Diff-Prot]
Note 2: Settings for harmonic and CT saturation detection like Stab
H2/H4/H5 can be set to inactive if they are probably not required for
Phase Differential Protection.
Note 3: The direction convention adopted here is as shown in the
drawing.
Note 4: In case of different primary rated currents the appropriate
setting must be made at [Field settings / General / Ib Reference].
(It is advisable to define Ib based on the CT with the highest rated
current.)
601 MCDLV4 DOK-HB-MCDLV4-2E
Id
_
Z
0
2
3 3
Protective
Device
87L
Protective
Device
87L
Protection
communi-
cation
interface
I
I
(local) (remote)