168
FUNCTION CHARACTERISTICS
CIRCUIT BREAKER DIAGNOSTIC
Four different criteria can be select.
1) Number of CB trip mode (ModeN.OpenON). When the number of operations (N.Open) is exce-
eded, an output relay and/or LED can be activated.
2) Cumulative CB currents mode (ModeSumI ON). When the per-phase value exceeds the thre-
shold, an output relay and/or LED can be activated.
3) Cumulative CB I
2
t mode (ModeSumI^2tON). The tripping energy I
2
t is calculated on the base of
current measure at the time of the open command on the base of the circuit breaker opening time
provided for I
2
t calculation (tbreak). When the per-phase value exceeds the threshold, an output
relay and/or LED can be activated.
4) CB operating time mode (Mode-tOpenON). The time interval between the trip command and the
CB open acquisition is calculated on the base of a programmable relay (Ktrig-break). When the
time interval (tbreak>) is exceeded, an output relay and/or LED can be activated.
The four criteria can be contemporaneously or separately set.
All the parameters are available inside the Set \ Circuit Breaker supervision \ CB Diagnostic menu.
Fun-CB-diagnostic.ai
CB Diagnostic - Number of trips
CB Diagnostic - Cumulative tripping currents
CB Diagnostic - Cumulative tripping energy I2t
CB Diagnostic - CB operating time
From CB position
N.Open-K
N.Open-L
SumI-K
SumI-L
SumI^2t-K
SumI^2t-L
tbreak-K
tbreak-L
TRIPPING MATRIX
(LED+RELAYS)
TRIPPING MATRIX
(LED+RELAYS)
TRIPPING MATRIX
(LED+RELAYS)
State N.Open
t
break
State SumI
Opening transition
≥
N.Open
Mode-N.Open
&
From CB position
Opening transition
≥
Mode-tOpen
Ktrig-break
&
From CB position
SumIL3
SumIL2
SumIL1
Opening transition
≥
Sum I
SumI
Mode-SumI
Mode-SumI^2t
&
I
L2
∑
I
L1
I
Max
Max
∑
I
∑
I
I
L3
TRIPPING MATRIX
(LED+RELAYS)
State SumI^2t
State tbreak
From CB position
SumIL3^2t
SumIL2^2t
SumIL1^2t
Opening transition
≥
Sum I^2t
Sum I^2t
&
I
L2
∑
I
L1
I2t
∑
I2t
∑
I2t
Max
Max
I
L3
XMR-T EQUIPMENT MANUAL
Ed. 2.9 - 02/2021
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