Woodward HighPROtec MCDLV4, Manual, Page: 602 / 1275

Protective Elements
ANSI 87L / 87T – Line Differential Protection
with an In-Zone transformer
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.
⇨
In the menu [Device Planning]
⇨ S
et “Transformer.Mode = use”
Set the Field Parameters of the Transformer.
⇨
In the menu [Field Para\Transformer]
Set the Differential Protection Parameters.
⇨
In the menu [Protection Para\Set [x]\Diff-Prot]
Note 2: Settings for harmonic and CT saturation detection like Stab
H2/H4/H5 can be set to active if they are probably used for Phase
Differential Protection.
Note 3: The direction convention adopted here is as shown in the
drawing.
Note 4: In the device settings it must be defined at which side of the
transformer the measuring is done. The actual side can be
selected at [Field settings / Transformer / Measuring side]:
•
W1 (primary winding side)
•
W2 (secondary winding side)
602 MCDLV4 DOK-HB-MCDLV4-2E
Id
_Z
0
3
3 3
Protective
Device
87L
Protective
Device
87L
Protection
communi-
cation
interface
I
I
In Zone
Trans-
former
( free
option)
W2 W1
(local) (remote)