Four Step Residual Overcurrent Protection, (Zero Sequence Or Negative Sequence Directionality) Ef4Ptoc (51N/67N) - ABB RELION 670 Series Applications Manual

Section 8
Current protection
The delay characteristics are described in
the choice of the reset delay.
For the definite time delay characteristics, the possible delay time setting instantaneous (1) and
IEC (2 = set constant time reset).
For ANSI inverse time characteristics, all three types of reset time characteristics are available:
instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 = current dependent reset time).
For IEC inverse time characteristics, the possible delay time settings are instantaneous (1) and IEC
(2 = set constant time reset).
For the customer tailor-made inverse time delay characteristics (type 17), all three types of reset
time characteristics are available: instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 =
current dependent reset time). If the current-dependent type is used, settings
be given.
tResetx : Constant reset time delay in seconds for step x.
tPCrvx , tACrvx , tBCrvx , tCCrvx : These parameters are used by the customer to create the inverse
time characteristic curve. See equation
information, refer to
æ
ç
[ ]
ç
=
t s
ç
ç
è
ANSI-EQUATION1261 V1 EN-US
tPRCrvx , tTRCrvx , tCRCrvx : These parameters are used by the customer to create the inverse reset
time characteristic curve. For more information, refer to
HarmRestrainx : Enables the block of step x from the harmonic restrain function (2nd harmonic).
This function should be used when there is a risk of an unwanted trip caused by power
transformer inrush currents. It can be set to
8.2 Four step residual overcurrent protection, (Zero
sequence or negative sequence directionality) EF4PTOC
(51N/67N)
8.2.1 Identification
Function description
Four step residual overcurrent
protection
114
Technical manual .
ö
÷
A
÷
+ ×
B MultPUx
p ÷
æ ö
i
ç ÷ - ÷
C
è ø ø
in
>
Technical manual . There are some restrictions regarding
36 for the time characteristic equation. For more
Technical manual .
Disabled / Enabled .
IEC 61850 IEC 60617
identification identification
EF4PTOC
4(IN>)
4
alt
4
TEF-REVA V2 EN-US
1MRK 511 364-UUS A
pr , tr and cr must
(Equation 36)
ANSI/IEEE C37.2
device number
51N_67N
Application manual
IP14509-1 v6
M14881-1 v5