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high sensitivity and high speed tripping as it protects each winding separately and thus
does not need inrush stabilization.
The low-impedance function is a percentage biased function with an additional zero
sequence current directional comparison criterion. This gives excellent sensitivity and
stability during through faults. The function allows the use of different CT ratios and
magnetizing characteristics on the phase and neutral CT cores. Unlike high impedance
restricted ground fault it allows for mixing with other functions and protection IEDs on the
same CT cores.
6.2.3
Function block
ANSI09000275-1-en.vsd
REFPDIF (87N)
I3P*
I3PW1CT1*
I3PW2CT1*
BLOCK
TRIP
PICKUP
DIR_INT
BLK2H
IRES
IN
IBIAS
IDIFF
ANGLE
2NDHARM
ANSI09000275 V1 EN
Figure 43:
REFPDIF (87N) function block
6.2.4
Signals
Table 31:
Input signals for the function block REFPDIF (REF1-)
Signal
Description
I3P
Group signal for neutral current input
I3PW1CT1
Group signal for primary CT1 current input
I3PW2CT1
Group signal for secondary CT1 current input
BLOCK
Block of function
Table 32:
Output signals for the function block REFPDIF (REF1-)
Signal
Description
TRIP
General trip signal
START
General start signal
DIROK
Directional criteria has operated for internal fault
BLK2H
Block due to 2-nd harmonic
IRES
Magnitude of fundamental frequency residual current
Table continues on next page
1MRK 502 048-UUS A
Section 6
Differential protection
119
Technical manual
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