Page 81 - SACE Tmax XT - Catalogue

PROTECTION TRIP UNITS 3/47

Extremely Inverse
Very Inverse
Standard Inverse 03
RC Residual current
t PE L1 L2 L3 N
l1 This available only for the XT7, with a constant time (t=k) and protects against indirect contacts and is
integrated into the Ekip Touch LSIG with an Ekip Measuring with a dedicated residual current rating
plug and external toroid. The protection is an alternative to the G and Gext functions.
l3
I LOAD

t Second protection against ground fault
l1
protection zone This is available only for the XT7. Whereas with the Ekip Touch, the user has to choose between imple-
∆ Y mentation of the G type protection using internal current sensors (calculating the vector sum of the
currents) or Gext external toroids (direct measurement of the ground fault current), the Ekip Hi-Touch
64REF
offers the exclusive feature of simultaneous management of both configurations by two independent
I RP ground fault protection curves. Owing to this characteristic, the trip unit is able to distinguish a non-re-
stricted from a restricted ground fault, and then activate the opening of the circuit-breaker and command
t the opening of the medium voltage circuit-breaker. Another possible configuration is with the residual
current protection replacing the Gext protection, while the G protection remains active. The residual
current protection is activated in the presence of the residual current rating-plug and of the toroid.

I L1 L2 L3 RC Differential ground fault protection against ground faults
Available on the XT7 only, this unit protects against internal ground faults on the generator windings.
It is required that the toroid (additional accessory) embraces the active conductors and the ground
t
conductor. RC protection is integrated via a dedicated residual current rating plug and an external toroid.

l3
I

t

I

t l1
t1
l2
t2
t4
l3
l4
I
t l1
t1
l2
t2
l3
I
t l1

t1
t4
l3
l4
I