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Function
Range or value
Accuracy
Base sensitivity function
(0.05 - 0.60) x
IBase
± 1.0% of In
Minimum negative sequence current
(0.02 - 0.20) x
IBase
± 1.0% of In
Operate angle, negative sequence
(30.0 - 90.0) degrees
± 1.0 degrees
Second harmonic blocking
(5.0-100.0)% of
fundamental differential
current
± 2.0% of applied harmonic
magnitude
Fifth harmonic blocking
(5.0-100.0)% of
fundamental differential
current
± 12.0% of applied harmonic
magnitude
Connection type for each of the windings
Wye or delta
-
Phase displacement between high voltage
winding, W1 and each of the windings, W2
and W3. Hour notation
0–11
-
Operate time, restrained function
25 ms typically at 0 to 5
x set level
-
Reset time, restrained function
25 ms typically at 5 to 0
x set level
-
Operate time, unrestrained function
20 ms typically at 0 to 5
x set level
-
Reset time, unrestrained function
25 ms typically at 5 to 0
x set level
-
6.2
Restricted earth-fault protection, low impedance
REFPDIF (87N)
6.2.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Restricted earth-fault protection, low
impedance
REFPDIF
IdN/I
SYMBOL-AA V1 EN
87N
6.2.2
Functionality
Restricted fault protection, low-impedance function REFPDIF (87N)can be used on all
solidly or low-impedance grounded windings. The REFPDIF (87N) function provides
Section 6
1MRK 502 048-UUS A
Differential protection
118
Technical manual
Summary of Contents for 650 series
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