Siemens Siprotec 5 7SS85 User Manual

Circuit-Breaker Failure Protection 1-Pole/3-Pole
Starting Conditions
For circuit-breaker failure protection
1-pole tripping internal or external
33
3-pole tripping internal or external
34
Setting Values
Phase-current threshold
values
1 A @ 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
Threshold value sensitive 1 A @ 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
Supervision time of release signal 0.00 s to 1.00 s Increments of 0.01 s
Time delays T1 0.000 s to 60.000 s Increments of 0.001 s
Time delays T2 0.050 s to 60.000 s Increments of 0.001 s
Supervision times of the binary inputs 0.05 s to 60.00 s Increments of 0.01 s
Dropout
The larger dropout differential (= | pickup threshold – dropout threshold |) of the following 2
criteria is used:
Dropout differential derived from the parameter
Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies to the current threshold values.
Minimum absolute dropout differential
Protection-class current transformers 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument transformers 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Circuit-Breaker Supervision
Supervision of circuit-breaker auxiliary-contact position
For 3-pole CB tripping 1 input each for make contact and break contact
For 1-pole CB tripping 1 input each for auxiliary contact per pole or
1 input for each series connection make contact and
break contact
i
i
NOTE
The circuit-breaker failure protection can also work without the circuit-breaker auxiliary contacts stated.
Auxiliary contacts are required for circuit-breaker failure protection in cases where the current flow is
absent or too low for tripping (for example with a transformer or a Buchholz protection).
Times
Pickup time, in the case of an internal start
Pickup time, in the case of an external start
< 1 ms
< 5 ms
Dropout time for unbalancing operating mode Approx. 2 ms
11.4
33
Via binary inputs
34
Via binary inputs
Technical Data
11.4 Circuit-Breaker Failure Protection 1-Pole/3-Pole
SIPROTEC 5, Low-Impedance Busbar Protection, Manual 915
C53000-G5040-C019-C, Edition 04.2021

Siemens Siprotec 5 7SS85 Specifications

General

Brand	Siemens
Model	Siprotec 5 7SS85
Category	Industrial Equipment
Language	English