Siemens SIPROTEC 4 7SD80 User Manual

87 Differential Protection Phase Comparison Protection
Pickup Values
Differential current, dynamic;
87L Idyn>
Ι
Nom
= 1 A
0.20 A to 4.00 A Increments 0.01 A
Ι
Nom
= 5 A
1.00 A to 20.00 A
Differential current when switching onto a
fault;
87L Idyn close>
Ι
Nom
= 1 A
0.20 A to 4.00 A Increments 0.01 A
Ι
Nom
= 5 A
1.00 A to 20.00 A
Differential current, static;
87L Isteady>
Ι
Nom
= 1 A
0.50 A to 4.00 A Increments 0.01 A
Ι
Nom
= 5 A
2.50 A to 20.00 A
Operating Times
The operating times depend on the communication speed. The following data require a transmission rate of 512 kbit/s.
Pickup time with infeed at both ends approx. 15 ms to 40 ms
Trip times with infeed at both ends approx. 35 ms to 40 ms
Command time approx. 15 ms to 90 ms
Start time at 50 Hz approx. 51 ms
Frequency range 45 Hz to 55 Hz at 50 Hz
55 Hz to 65 Hz at 60 Hz
25 Hz to 45 Hz at 50 Hz
30 Hz to 55 Hz at 60 Hz
if only the static element is active
Tolerances
Ι
Nom
= 1 A
20 mA
Ι
Nom
= 5 A
100 mA
Time Delaytime delays
Tripping delay
87L Trip Delay
0.00 s to 0.10 s Increments 0.01 s
Expiry tolerances 1 % of set value or 10 ms
The set times are pure time delays
Emergency Operation
Communication failure
See section “Time Overcurrent Protection”
Frequency Operating Range
Operating Range
0.8 ≤ f/f
Nom
≤ 1.2
stable when starting machine
4.3
Technical Data
4.3 87 Differential Protection Phase Comparison Protection
SIPROTEC 4, 7SD80, Manual 261
E50417-G1100-C474-A2, Edition 02.2018

Siemens SIPROTEC 4 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7SD80
Category	Power distribution unit
Language	English