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2).
The ZSO output can connected maximum ZSI relays the supply side the selectivity chain.2.2.
Use corded shielded two-wire cable (see note par.9.2.2.n remain operational.2.
Model 3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No.
Wiring and enabling zone selectivity "S" alternative using protection "D" and operation only guaranteed when there auxiliary voltage.
A
The maximum length cable for zone selectivity, between two units, 300 meters..
The following logical table implemented manage the Zone Selectivity Input (ZSI) and Zone Selectivity Output (ZSO) signals:
Zone selectivity Imax ZSI signal ZSO signal Trip T
Excluded trip
Excluded trip
Excluded YES programmed
Excluded YES programmed
Inserted trip
Inserted trip
Inserted YES 1
Inserted YES programmed
The time must set value corresponding least tselectivity +50ms, supply side, not required the first one the chain. This function valid for only.
This function enables better selectivity level obtained than using release without "double S".2.
The function can enabled from the menu the protection "I" page.4 Protection “I”
The protection enabled/disabled from the menu. 13.
In the case where zone selectivity "S" active, during the trip the relay for "I", the ZSO output signal activated any case guarantee correct
operation the relay the supply side (and the load side).5 Protection against closing short-circuit “MCR”
The MCR can used protect the system from any closing short-circuit. the wiring has been done correctly, all the zone
selectivity inputs the last circuit-breakers the chain and all the outputs the circuit-breakers the head each chain must empty.
This function can activated through hand-held PR010/T unit via SD-Testbus2, SD-Pocket software through remote system via the system
bus.4.
13.
This done connecting all the zone selectivity outputs the releases belonging the same zone one another (ZSO=K51/SZout) and taking
this signal the zone selectivity input (ZSI K51/SZin) the next release the supply side.
This protection goes when the closed, within time window ranging from 500ms and with threshold set customer, using
the same algorithm protection This protection can disabled and alternative protection “I”.3 Double S
Thanks the new PR123/DC release that enables two independent and simultaneously active protection thresholds specified, selectivity
can assured even critical conditions.
13..
The shield must only earthed the circuit-breaker the supply-side relay (ZSI side).The zone selectivity function, guaranteed only auxiliary voltage provided, enables the area the fault isolated, only isolating the part
of plant nearest the fault, while keeping the rest the plant operational.3 Zone selectivity “S”
As practical example, the figure above shows fault the load side the "Relay 1a" isolated the latter without the "Relay the "Relay
0" being affected; fault immediately downstream from the "Relay will isolated the latter without the "Relay being affected, thus ensuring
that the Areas 2.1 Start-up threshold “I”
The start-up function can selected.2.
13.9.
52/1 08
. 11.9.2). This function has one single fixed-time protection curve.2.
13.
13.9.
The function behaves exactly the same way the protection "S" (see par.9.2.9
