Thytronic NG10 User Manual

FUNCTION CHARACTERISTICS
86
NG10 - 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 x menus. The IN1 tON, IN2tON, IN1 tOFF and IN2tOFF
time delays 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 INx 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 side H
menu for side H and Set \ Circuit breaker supervision \ LEDs-relays allocation side L menu for side
L; the CB position can be visualized by means two LEDs (CBopen-Land CBclose-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). When the number of operations (N.Open) is exceeded,
an output relay and/or LED can be activated.
2) Cumulative CB currents mode (ModeSumI). When the per-phase value exceeds the threshold,
an output relay and/or LED can be activated.
3) Cumulative CB I
2
t mode (ModeSumI). 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). The time interval between the trip command and the CB
open acquisition is calculated on the base of a programmable relay (Ktrig-breakfor side H and
Ktrig-breakfor side L). 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.
Fun-CB-position.ai
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
52a
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
Logic diagram concerning the circuit breaker diagnostic function

Thytronic NG10 Specifications

General

Brand	Thytronic
Model	NG10
Category	Protection Device
Language	English