Siemens siprotec SJ62 User Manual page 109

2 Functions
67N-1 Directional
Relay Element
(ground)
Pickup Stabilization
(67/67N Directional)
67-TOC Directional
Element with IEC or
ANSI Curves (Phas-
es)
107
The pickup value of the 67N-1 relay element should be set below the minimum antic-
ipated ground fault current.
If the relay is used to protect transformers or motors with large inrush currents, the
inrush restraint feature of 7SJ62/63/64 may be used for the 67N-1 relay element (for
more information see margin heading "Inrush Restraint").
The delay is set at address 1605 67N-1 DELAY and should be based on system co-
ordination requirements for directional tripping. For ground currents in a grounded
system a separate coordination chart with short time delays 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 pre-
vents from tripping and the generation of a pickup message.
Pickup of the direction 67/67N elements can be stabilized by setting dropout times
1518 67 T DROP-OUT or 1618 67N T DROP-OUT.
Having set address 115 67/67-TOC = TOC IEC or TOC ANSI when configuring the
protective functions (Section 2.1.1), the parameters for the inverse characteristics will
also be available.
If the relay is used to protect transformers or motors with large inrush currents, the
inrush restraint feature of 7SJ62/63/64 may be used for the 67-TOC relay element (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.
The current value is set in address 1507 67-TOC PICKUP. The setting is mainly de-
termined by the maximum operating current. Pickup due to overload should never
occur, since the device in this operating mode operates as fault protection with corre-
spondingly 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 config-
uration (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.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015