Siemens siprotec 7SA6 User Manual

Functions
6-2477SA6 Manual
C53000-G1176-C133-1
Since an overload usually occurs in a balanced way, this setting is of minor
importance. If unbalanced overloads are to be expected, however, these options lead
to different results.
Averaging should only be used if a rapid thermal equilibrium is possible in the
protected object, e.g. with belted cables. If the three phases are, however, more or
less thermally isolated (e.g. single conductor cables or overhead lines), one of the
maximum settings should be chosen at any rate.
6.17.3 Settings
Note: The indicated secondary current for setting ranges and default settings refer to
I
N
= 1 A. For the nominal current 5 A the current values are to be multiplied by 5.
6.17.4 Information Overview
Addr. Setting Title Setting Options Default Setting Comments
4201 Ther. OVERLOAD OFF
ON
Alarm Only
OFF Thermal overload protection
4202 K-FACTOR 0.10..4.00 1.10 K-Factor
4203 TIME CONSTANT 1.0..999.9 min 100.0 min Time constant
4204 Θ ALARM 50..100 % 90 % Thermal Alarm Stage
4205 I ALARM 0.10..4.00 A 1.00 A Current Overload Alarm setpoint
4206 CALC. METHOD Theta Max
Average Theta
Theta from Imax
Theta Max Method of Acquiring Tempera-
ture
F.No. Alarm Comments
1503 >BLK ThOverload >BLOCK Thermal Overload Protection
1511 Th.Overload OFF Thermal Overload Protection OFF
1512 Th.Overload BLK Thermal Overload Protection BLOCKED
1513 Th.O/L ACTIVE Thermal Overload Protection ACTIVE
1515 Th.O/L I Alarm Th. Overload: Current Alarm (I alarm)
1516 Th.O/L Θ Alarm Th. Overload Alarm: Near Thermal Trip
1517 Th.O/L Pickup Th. Overload Pickup before trip
1521 Th.O/L TRIP Th. Overload TRIP command

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English