Settings - Siemens Siprotec 7UM611 Manual

The current value is set at address 1402 Ip. The setting is mainly determined by the
maximum operating current. Pickup due to overload should never occur, since the
device in this operating mode operates as fault protection with correspondingly short
tripping times and not as overload protection.
The corresponding time multiplier for configuration of IEC characteristics (address
114 O/C PROT. Ip = with IEC) is accessible under address 1403 T Ip.
The corresponding time multiplier for configuration of ANSI characteristics (address
114 O/C PROT. Ip= with ANSI) is accessible under address 1404 TIME DIAL:
TD.
The time multipliers must be coordinated with the network grading plan.
The time multipliers can also be set to ∞. After pickup the element will then not trip.
Pickup, however, will be signaled. If the Ip stage is not required, on configuration of
the protection function (Section 2.2) address 114 O/C PROT. Ip is set to Disabled
or this function switched under 1401 O/C Ip = OFF.
The address 1408 serves to predefine the U< pick-up value for the undervoltage trip
of the Ip pickup value for voltage-controlled inverse overcurrent time protection/AMZ
(parameter 1407 VOLT. INFLUENCE = Volt. controll.). The parameter is set
to a value just below the lowest phase-to-phase voltage admissible during operation,
e.g. from 75 to 80 V. In this context, the same rules apply as for the undervoltage seal-
in of the definite overcurrent time protection (see also subsection 2.6.2).
If at address 1407 VOLT. INFLUENCE is set to without or Volt. restraint, the
parameter 1408 has no function.
2.8.3

Settings

The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary nominal current of the current transformer.
Addr. Parameter
1401 O/C Ip
1402 Ip
1403 T Ip
1404 TIME DIAL: TD
1405 IEC CURVE
1406 ANSI CURVE
7UM61 Manual
C53000-G1176-C127-3
2.8 Inverse-Time Overcurrent Protection (ANSI 51V)
C Setting Options
OFF
ON
Block relay
1A 0.10 .. 4.00 A
5A 0.50 .. 20.00 A
0.05 .. 3.20 sec; ∞
0.50 .. 15.00 ; ∞
Normal Inverse
Very Inverse
Extremely Inv.
Very Inverse
Inverse
Moderately Inv.
Extremely Inv.
Definite Inv.
Default Setting
OFF Inverse O/C Time Protec-
tion Ip
1.00 A Ip Pickup
5.00 A
0.50 sec T Ip Time Dial
5.00 TIME DIAL: TD
Normal Inverse IEC Curve
Very Inverse ANSI Curve
Comments
57