Siemens SIPROTEC 4 Manual page 99

The delay is set at address 1605 67N-1 DELAY and should be based on system coordination requirements for
directional tripping. For ground currents in a grounded system a separate coordination chart with short time
delay is often used.
The selected time is only an additional time delay and does not include the operating time (measuring time,
dropout time). The delay can be set to ∞. After pickup the element will then not trip. Pickup, however, will be
signaled. If the 67N-1 element is not required at all, the pickup value 67N-1 PICKUP should be set to ∞. This
setting prevents from tripping and the generation of a pickup message.
Pickup Stabilization (67/67N Directional)
The pickups can also be stabilized via parameterizable dropout times under address 1518 67 T DROP-OUT or
1618 67N T DROP-OUT.
Directional Element 67-TOC with IEC or ANSI Curves (phases)
Having set address 115 67/67-TOC = TOC IEC or TOC ANSI when configuring the protection functions
(Section 2.1.1 Functional
If the relay is used to protect transformers or motors with large inrush currents, the inrush restraint function of
7SJ80 may be used for the 67-TOC element (67-TOC PICKUP) (for more information see margin heading
"Inrush Restraint").
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. This means that a pickup will only occur if a
current of about 1.1 times the setting value is present. If Address 1510 67-TOC Drop-out is set to Disk
Emulation, reset will occur in accordance with the reset curve as described in Section
Protection 50, 51, 50N,
The current value is set in address 1507 67-TOC PICKUP. The setting is mainly determined by the maximum
operating current. Pickup due to overload should never occur, since the device in this operating mode oper-
ates as fault protection with correspondingly short tripping times and not as overload protection.
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
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. oder Definite Inv.) in address 1512
67- ANSI CURVE.
Directional Element 67N-TOC with IEC or ANSI Curves (ground)
Having set address 116 67N/67N-TOC = TOC IEC when configuring the protection functions (Section
2.1.1 Functional
address 1611 67N-TOC IEC the desired IEC characteristic (Normal Inverse, Very Inverse, Extremely
Inv. or Long Inverse). If address 116 67N/67N-TOC was set to TOC ANSI, you can select the desired
ANSI characteristic (Very Inverse, Inverse, 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
7SJ80 may be used for the 67N-TOC element (67N-TOC PICKUP) (for more information see margin heading
"Inrush Restraint").
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
nondirectional time overcurrent protection described in Section
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
Scope), the parameters for the inverse time characteristics will also be available.
51N.
Scope), the parameters for the inverse time characteristics will also be available. Specify in
2.3 Directional Overcurrent Protection 67, 67N
2.1.1 Functional Scope).
2.2 Overcurrent Protection 50, 51, 50N,
Functions
2.2 Overcurrent
51N.
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