Start-Up Threshold S; Zone S Selectivity; Protection S2 - ABB Tmax T7 Operating Instructions Manual

3.6.3.2.

Start-up threshold S

The start-up function can be selected in the case where the curve with fixed time is selected.
The start-up function enables the protection threshold (S, I and G) to be changed during a time interval lasting "ts", starting from
"start-up". The latter must be intended as follows:
- Passage of at least one of the phase currents above the activation threshold of the adjustable Start-Up with Ekip Connect or
PR010/T (0.1...10In, by 0.1In steps); A new start-up is possible after the current has dropped below this threshold.
3.6.3.3.

Zone S selectivity

NOTE: function not available with PR332/P MM.
The zone selectivity function, guaranteed only if an auxiliary voltage is provided, enables the area of the fault to be isolated, only
isolating the part of plant nearest to the fault, while keeping the rest of the plant operational.
This is achieved by connecting all the zone selectivity outputs (ZSO=K51/SZout) of the protection releases belonging to the same
zone to each other and by conveying this signal to the zone selectivity input (ZSI=K51/SZin) of the protection release immediately
upstream. If the wiring has been done correctly, all the zone selectivity inputs of the last circuit-breakers in the chain and all the
outputs of the circuit-breakers at the head of each chain must be empty.
As a practical example, the figure above shows how a fault on the load side of "Release 1a" will be isolated by this latter without
"Release 1" or "Release 0" being tripped. A fault immediately downstream of "Release 1" will be isolated by this latter without
"Release 0" being tripped, thus ensuring that Areas 2...n remain operative.
The following logical table is implemented to manage the Zone Selectivity Input (ZSI) and Zone Selectivity Output (ZSO) signals:
Zone selectivity
Excluded
Excluded
Excluded
Excluded
Inserted
Inserted
Inserted
Inserted
The time t must be set at a value higher than or equal to t
2
one in the chain.
3.6.4.

Protection S2

PR333/P allows two protection S thresholds to be set. They are independent of each other but can be activated at the same time.
This function allows a better selectivity level to be obtained than by using a protection release without "double S".
WARNING: The zone selectivity function with double S is valid with the t=k time setting
B0431
Mod.
Start-Up Threshold I2
I
Activation of Start-Up
ts
ZsO
1
1
Release
ZsI
1
ZsO ZsO
1a 1b
1a 1b
Release Release
Area 1
I > I
f 2
NO
NO
YES
YES
NO
NO
YES
YES
B1751
Threshold I2
Threshold Start-Up activation
0
Release
ZsI
0
ZsO
2
2
Release
ZsI
2
Area 2
ZSI signal ZSO signal
0 0
1 0
0 0
1 0
0 0
1 1
0 1
1 1
+50 ms, on the CB on the supply side, not required on the first
selectivity
Apparatus
Doc N°
t
ZsO
n
n
Release
ZsI
n
Area n
Trip T
No trip
No trip
t programmed
2
t programmed
2
No trip
No trip
t
selectivity
t programmed
2
.
Emax X1-Tmax T7-Tmax T8
1SDH000587R0002
Scale
Page No
30/66