TB XRI1-IE 11.01 E
5
3
Design
3.1
Connections
Figure 3.1:
Connection diagram XRI1-IE
3.1.1
Analog input circuits
The protection unit receives the analog input signals of
the phase currents IL1 (1S1-1S2), IL2 (2S1-2S2), IL3
(3S1-3S2), and earth current (1E1-1E2) each via
separate input transformers. The constantly detected
current measuring values are galvanically decoupled,
filtered and finally fed to the analog/digital converter.
3.1.2
Blocking input
The blocking functions adjusted before will be blocked
if an auxiliary voltage is connected to (terminals)
C1/C1L or C1/C1H. (See chapter 6.1.20)
3.1.3
External reset input
By applying the aux. voltage C2/C2L or C2/C2H,
indication and output relays are reset. (see chapter
6.4)
3.1.4
Output relays
The
XRI1-IE
is equipped with 5 output relays.
•
Output relays 1;
11, 12, 14 and 21, 22, 24
•
Output relays 2;
31, 32, 34 and 41, 42, 44
•
Output relays 3;
51, 52, 54
•
Output relays 4;
61, 62, 64
•
Signal selfsupervision
71, 72, 74
All trip and alarm relays are working current relays, the
relay for self supervision is an idle current relay.
See connection diagram relay outputs.
Except the self-supervision, all relays can be assigned
to different functions. (see 6.1.20).