Considering the safety margins mentioned previously, the minimum setting (Is) is:
I
s
= 1.3 ×
I
min
EQUATION288 V3 EN-US
(Equation 430)
The IED setting value
IN>>
is given in percent of the primary base current value,
IBase. The value for
IN>>
is given by the formula:
(
) 100
s
IN
I
IBase
IECEQUATION17003 V1 EN-US
(Equation 431)
Transformer inrush current shall be considered.
The setting of the protection is set as a percentage of the base current (
IBase
).
Operation
: set the protection to
Enabled
or
Disabled
.
Pickup
: Set operate current in % of
IB
.
IN>>Max
and
IN>>Min
should only be changed if remote setting of operation current
level,
IN>>
, is used. The limits are used for decreasing the used range of the
IN>>
setting. If
IN>>
is set outside
IN>>Max
and
IN>>Min
, the closest of the limits to
IN>>
is used by the function. If
IN>>Max
is smaller than
IN>>Min
, the limits are
swapped.
MultPU
: The set operate current can be changed by activation of the binary input
MULTPU to the set factor
MultPU
.
9.4
Directional residual overcurrent protection, four steps
EF4PTOC (51N/67N)
IP14509-1 v8
9.4.1
Identification
M14881-1 v6
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional residual overcurrent
protection, four steps
EF4PTOC
4(IN>)
4
alt
4
TEF-REVA V2 EN-US
51N_67N
Section 9
1MRK 504 163-UUS A
Current protection
534
Transformer protection RET670 2.2 ANSI
Application manual
Summary of Contents for RELION RET670
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