FUNCTION CHARACTERISTICS
33
NA016 - Manual - 05 - 2022
4.5 CONTROL AND MONITORING
Data Logger
Preface
When remotely controlled by shunt trip coil is employed a data Logger is advisable to provide a full
monitoring of the protection system.
[1]
• Any power down of the auxiliary power supply are logged inside the 100 events; Power up and
Power down are stored inside distinct events
• A dedicated element is provided for the Trip Circuit Supervision function; any fail inside the trip
circuit is monitored (break on the coil and the circuit, power supply failure). The congruity of the
auxiliary contact is detected in run time mode (52a and 52b), any failure is detect and stored inside
the 100 events.
• Any setting change is logged and information is stored inside ten memory register with time stamp
(date-time); any change is always stored inside the 100 events.
• Any start and/or trip of a protection element is stored inside the 100 events with time stamp (date-
time); moreover a detailed information (trip cause, input currents, I/O states, faulted phase) is
stored inside twenty memory register.
• The relay diagnostic (self-test) is verified; any failure may drive relays and LEDs.
Trip circuit supervision - 74TCS
Preface
The trip circuit can be monitored to signal possible anomalies that would lead to the missing opening
of circuit breaker when trip and/or operator command are issued.
Circuit interruption as well as missing of auxiliary voltage and/or coil faults are detected.
Operation and settings
The 74TCS element may be enabled or disabled; to enable it, the
74TCS Enable
parameter must be
set to
ON
inside the
Set \ Circuit breaker
menu.
By means of the right sizing of a resistor, the trip circuit supervision may be performed even with
lower control voltage (e.g. when the control voltage is less than 36 V required for driving of two
binary inputs, typically
U
AUX
= 24V). The binary input is connected to the trip and an external resistor
must be connected the 52b auxiliary contact.
Note 1 The Data Logger function is available on request (to be selected on order ).
50N
51N
50
51
DG
TA
TO
PG
74TCS
NA016
SELF
LOGGER
TCS1s.ai
TRIP
R
+
U
AUX
-
U
AUX
52a
52b
52
NA016
IN3
Binary input INx
Towards 74TCS logic
Trip Circuit Supervision - 74TCS
