Thytronic NA10 User Manual

FUNCTION CHARACTERISTICS
82
NA10 - Manual - 04 - 2022
Circuit breaker supervision
Preface
Several diagnostic metering and monitoring function are available:
• By means 52a and 52b auxiliary contacts, the CB position is acquired. Depending on such information
the Open and/or Close commands can be safely issued by user.
• An adjustable threshold can be set for a wear estimate of the breaker contacts; the current values
(SI or SI
2
) are summed and compared to a user-adjustable threshold. When the threshold or the
number of operations is exceeded the relay can activate an output relay. The function helps to
adjust maintenance planning.
• By means 52a and 52b auxiliary contacts, the opening time is calculated and compared to a user-ad-
justable threshold. If the threshold is exceeded the relay can activate an output relay.
Operation and settings
According to the conventional contact position
• 52a is the auxiliary contact that is in the same position as the circuit breaker, (52a open = CB open),
• 52b is the auxiliary contact that is in the opposite position as the circuit breaker, (52a open = CB
closed).
To acquire the CB position, the 52a and 52b function must be set inside the Set\Inputs\Binary input 1
and Set\Inputs\Binary input 2 menus. The IN1 tON, IN2 tON, IN1 tOFF and IN2 tOFF time de-
lays must be reset to zero and the Logic parameter must be set to Active-ON inside the Set\Inputs\
Binary input IN1 and Set\Inputs\Binary input IN2 menus.
CIRCUIT BREAKER COMMANDS
Two output relays can be set to command CB opening and closing; the CBopen-K and CBclose-K
function must be set inside the Set\Circuit breaker supervision\LEDs-relays allocation menu; the CB
position can be visualized by means two LEDs (CBopen-L and CBclosed-L parameters).
All the parameters are common for Profile A and Profile B.
CIRCUIT BREAKER DIAGNOSTIC
Four different criteria can be select.
1) Number of CB trip mode (ModeN.Open ON). When the number of operations (N.Open) is ex-
ceeded, an output relay and/or LED can be activated.
2) Cumulative CB currents mode (ModeSumI ON). When the per-phase value exceeds the thresh-
old, an output relay and/or LED can be activated.
3) Cumulative CB I
2
t mode (ModeSumI^2t ON). 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-tOpen ON). 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 named parameters are available inside the Set\Circuit Breaker supervision\CB Diagnostic
menu.
Tutti i suddetti parametri, nonché l’associazione delle uscite ai relè finali ed ai LED, sono presenti nel
menù Set\Monitoraggio interruttore\Diagnostica interruttore.
Fun-CB-position.ai
Logic diagram concerning the circuit breaker diagnostic function
Towards CB diagnostic
TRIPPING MATRIX (LED)
52a ON/OFF
t
mask
0T
t
mask
CB monitoring
Opening transition
52b ON/OFF
52a
52
52b
+UAUX
-UAUX
IN-
IN+
52a
IN-
IN+
52b
Binary input INx
T 0
INx t
ON
T0
n.o.
n.c.
INx tON
Logic
INx tOFF
INx t
OFF
Binary input INx
T 0
INx t
ON
T0
n.o.
n.c.
INx tON
Logic
INx tOFF
INx t
OFF
=1

Thytronic NA10 Specifications

General

Brand	Thytronic
Model	NA10
Category	Relays
Language	English