Siemens 7SJ85 - Page 1448

Time multiplier 0.00 to 15.00 Increments of 0.01
Minimum time of the curve 0.00 s to 1.00 s Increments of 0.01 s
Additional time delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout 95 % of 1.1 ⋅ threshold value
Minimum absolute dropout differential
Protection-class current transformer 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Reset of the Integration Timer
Instantaneous With dropout
Disk emulation Approx. < 0.90 ⋅ threshold value
Operate Curves and Dropout-Time Characteristic Curves according to IEC
Normal inverse: type A
See chapter 12.5.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-1
Very inverse: type B
Extremely inverse: type C See chapter 12.5.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-2
Long-time inverse: type B
Operate Curves and Dropout-Time Characteristic Curves according to ANSI/IEEE
Inverse: type C
See chapter 12.5.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-3
Short inverse
Long inverse See chapter 12.5.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-4
Moderately inverse
Very inverse See chapter 12.5.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-5
Extremely inverse
Definite inverse See chapter 12.5.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-6
Direction Determination
Type
With healthy voltages
With voltage memory 2 s
Forward range V
ref,rot
±88°
Dropout differential forward/reverse range 1°
Directional sensitivity Unlimited for 1 and 2-phase short circuits
Dynamically unlimited, stationary for 3-phase short
circuits
Approx. 13 V phase-to-phase
Technical Data
12.8 Directional Overcurrent Protection, Phases
1448 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017