Functions
2.3 Directional Overcurrent Protection 67, 67N
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
114
The corresponding element time multiplication factor for an IEC characteristic is set at address 1508 67 TIME
DIAL and in address 1509 67 TIME DIAL for an ANSI characteristic. It must be coordinated with the time
grading of the network.
The time multiplier can also be set to ∞. After pickup the element will then not trip. Pickup, however, will be
signaled. If the 67-TOC element is not required at all, address 115 67/67-TOC should be set to Definite
Time during protective function configuration (see Section 2.1.1).
If address 115 67/67-TOC = TOC IEC, you can specify the desired IEC–characteristic (Normal Inverse,
Very Inverse, Extremely Inv. or Long Inverse) in address 1511 67- IEC CURVE. If address 115
67/67-TOC = TOC ANSI you can specify the desired ANSI–characteristic (Very Inverse, Inverse, Short
Inverse, Long Inverse, Moderately Inv., Extremely Inv. or Definite Inv.) in address 1512
67- ANSI CURVE.
67N-TOC Directional Element with IEC or ANSI Curves (ground)
Having set address 116 67N/67N-TOC = TOC IEC when configuring the protective functions (Section 2.1.1),
the parameters for the inverse characteristics will also be available. Specify in address 1611 67N-TOC IEC
the desired IEC characteristic (Normal Inverse, Very Inverse, Extremely Inv. or Long Inverse).
If address 116 67N/67N-TOC = TOC ANSI, you can specify the desired ANSI–characteristic (Very Inverse,
Inver
se, Short Inverse, Long Inverse, Moderately Inv., Extremely Inv. or Definite Inv.)
in address 1612 67N-TOC ANSI.
If the relay is used to protect transformers or motors with large inrush currents, the inrush restraint feature of
7SJ62/64 may be used for the 67N-TOC relay element (for more information see margin heading "Inrush Re-
straint").
If the inverse time trip characteristic is selected, it must be noted that a safety factor of about 1.1 has already
been included between the pickup value and the setting value 67N-TOC PICKUP. This means that a pickup
will only occur if a current of about 1.1 times the setting value is present. If Disk Emulation was selected at
address 1610 67N-TOC DropOut, reset will occur in accordance with the reset curve as for the existing non-
directional time overcurrent protection described in Section 2.2.
The current value is set at address 1607 67N-TOC PICKUP. The minimum appearing ground fault current is
most relevant for this setting.
The corresponding element time multiplication factor for an IEC characteristic is set at address 1608 67N-TOC
T-DIAL and in address 1609 67N-TOC T-DIAL for an ANSI characteristic. This has to be coordinated with
the system grading coordination chart for directional tripping. For ground currents with grounded network, you
can mostly set up a separate grading coordination chart with shorter delay times.
The time multiplier can also be set to ∞. After pickup the element will then not trip. Pickup, however, will be
signaled. If the 67N-TOC element is not required at all, address 116 67N/67N-TOC should be set to Definite
Time during protective function configuration (see Section 2.1.1).
User-defined characteristic (Inverse Time Phases and ground)
If address 115 or 116 were set to User Defined PU or User def. Reset during configuration of the user-
defined characteristic option, a maximum of 20 value pairs (current and time) may be entered at address 1530
67 or 1630 M.of PU TD. This option allows point-by-point entry of any desired curve.
If address 115 or
116 were set to Use
r def. Reset during configuration, additional value pairs (current and
reset time) may be entered in address 1531 MofPU Res T/Tp or 1631 I/IEp Rf T/TEp to represent the
reset curve.
Entry of the value pair (current and time) is a multiple of the settings of the values of the addresses 1507 67-
TOC PICKUP or 1607 67N-TOC PICKUP and 1508 67 TIME DIAL or 1608. 67N-TOC T-DIAL. Therefore,
it is recommended that parameter values are initially set to 1.00 for simplicity. Once the curve is entered, the
settings at addresses 1507 and 1607 or/and 1508 and 1608 may be modified later on if necessary.
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