51-1 Drop-out or 1247 51-2 Drop-out or 1261 51-3 Drop-out or 1269 51-4 Drop-out, resets will
occur in accordance with the reset curves as described before. Recloser curves don't support disk emulation.
The current values are set in address 1233 51-1 PICKUP, Address 1245 51-2 PICKUP, Address 1259 51-3
PICKUP and Address 1267 51-4 PICKUP. These pickup values could be set to ∞ individually. If an inverse
element's pickup value is set to ∞, this element is disabled. The setting is mainly determined by the maximum
anticipated operating current. Pickup due to overload should never occur since in this mode, the device oper-
ates as fault protection with correspondingly short tripping times and not as overload protection.
The corresponding time multipliers are set at address 1234 51-1 TIME DIAL, Address 1246 51-2 TIME
DIAL, Address 1260 51-3 TIME DIAL or Address 1268 51-4 TIME DIAL. They must be coordinated with
the time coordination chart of the system.
51N Element (ground) with IEC, ANSI or Recloser Characteristics
Having set address 113 Charac. Ground = TOC IEC, TOC ANSI or Recloser Curves when configuring
the protection functions (Section 2.1.1 Functional Scope), the parameters for the inverse time characteristics
will also be available.
If address 113 Charac. Ground was set to TOC IEC, you can select the desired IEC characteristic (Normal
Inverse, Very Inverse, Extremely Inv. or Long Inverse) at address 1311 51N IEC CURVE.
If address 113 Charac. Ground was set to TOC ANSI, you can select the desired ANSI characteristic (Very
Inverse, Inverse, Short Inverse, Long Inverse, Moderately Inv., Extremely Inv. or Defi-
nite Inv.) at address 1312 51N ANSI CURVE.
If address 113 Charac. Ground was set to Recloser Curves, you can select the desired Recloser charac-
teristic (Curve A (101), Curve B (117), Curve C (133), Curve D (116), Curve E (132), Curve
K (162), Curve N (104), Curve R (105), Curve W (138), Curve 2 (135), Curve 3 (140),
Curve 8 (113), Curve 8* (111), Curve 9 (131) or Curve 11 (141)) at address 1326 Recloser
Curves.
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 Disk Emulation was selected at address 1310 51
Drop-out, reset will occur in accordance with the reset curve as described before. Recloser curves don't
support disk emulation.
The current value is set in address 1307 51N PICKUP. The setting is mainly determined by the maximum
anticipated operating current. Pickup due to overload should never occur since in this mode, the device oper-
ates as fault protection with correspondingly short tripping times and not as overload protection.
The corresponding time multiplier for an IEC or Recloser characteristic is set at address 1308 51N TIME DIAL
and in address 1309 51N TIME DIAL for an ANSI characteristic. It must be coordinated with the time coordi-
nation chart of the system.
The time multiplier can also be set to ∞. In this case, the element will not trip after pickup. However, pickup
will be signaled. If the 51N element is not required at all, address 113 Charac. Ground should be set to
Definite Time during protection function configuration (see Section 2.1.1 Functional Scope).
51N-1, 51N-2, 51N-3, 51N-4 Element (Phases) with All Curves Characteristics
Having set address 113 Charac. Ground = All Curves when configuring the protection functions
(Section 2.1.1.2 Setting Notes), the elements 51N-1, 51N-2, 51N-3, 51N-4 are available. For each element,
you can select the curve type IEC, ANSI, or Recloser indivitually. For each element, you select one of tree
parameters. The other two parameters must be set to NO.
For example, for the element 51N-1 you can select:
At Address 1336 51N-1 IEC Cur. the desired IEC–characteristic.
At Address 1356 51-1 ANSI Curve the desired ANSI–characteristic
At Address 1357 51N-1 Rec. Cur. the desired Recloser–characteristic
The possoble settings for the curves are described in the sections above. If curve type is not selected correctly,
a warning message for this element would be announced.
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 Disk Emulations were selected at address 1335
Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
SIPROTEC Compact, 7SC80, Manual 91
E50417-G1140-C486-A8, Edition 07.2017
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