26
27
Electronic trip relay
9
9
Electronic trip relay
The display shows the current and harmonics for real time monitoring.
Moreover, the fault memory function is available so that it is possible to find out the
reason of breaker trip.
Display (DP)
Option
ETR
ACB
Power
supply
Alarm
contact
output
513
544
P1
P2
N1
N2
NCT
Block diagram with NCT function
The Neutral CT is used for ground fault protection when the 3-pole breaker is
used on a 3-phase 4-wire system and for the overcurrent protection on N phase.
Please use this CT in combination with ground fault protection (GF).
As for the outline dimensions, refer to page 34.
The length of the cable (attached) for NCT is 2 m.
Neutral CT (NCT)
*Only use for AE V Series
Option
GF function block diagram (In case of 4-pole breaker)
ETR
ACB
Power
supply
Alarm
contact
output
513
544
P1
P2
60
50
40
30
20
Operating time (s)
Ground fault current (% of CT rating ln)
0.1
0.3
3.0
0.1
1.0
(s)
10
5
4
3
2
1
.5
.05
.04
.03
.02
.4
.3
.2
.1
1
50
40
30
20
10
5
4
3
2
1
.5
.05
.04
.03
.02
.4
.3
.2
.1
10
20
50
100 125150 200
500
1000
Ground fault pick-up current: lg
In × 0.1-1.0 ±20% (step 0.1)
Ground fault time: Tg (Note)
0.1-0.15-0.3-0.5-0.8-1.5-3.0 (s) ±20%
Ground fault protection characteristic curve
Type name
ACB type
Rating ampere of current transformer (A)
NCT-06-V
AED630-CV
630
NCT-10-V
AED1000-CV
1000
NCT-12-V
AED1250-CV
1250
NCT-16-V
AED1600-CV
1600
Neutral Current Transformer type name
For outline dimensions, please refer to page 34.
Note) When Tg = “0.1” setting, operating time is 0.1 s ±50%.
When Tg = “0.15” setting, operating time is 0.15 s ±30%.
Specifications of display indication
Measuring items
Measuring
range
Display indication
Remark
Current
(A)
Current of each phase
0 to 200% In
***** A (In = 630 A to 1600 A)
Indication of 1 to N phase concurrently
(Bar graph display is also available)
Maximum value
–
Harmonics
(HI)
Fundamental harmonics of each phase
0 to 100% In
***** A (In = 630 A to 1600 A)
Indication of 1 to N phase
Harmonics of each phase/degree (3
rd
, 5
th
, 7
th
, 9
th
)
Each phase total value
Each phase total distortion rate
***.* %
Content rate of each phase/degree
Fault
memory
Trip cause/Fault current
0 to 2000% In
LTD
STD
INST
***** A (0-19999 A)
–
***.* kA (20000 A and more)
0 to 200% In
GF
***** A
GF is an option
Elapsed time since tripping
0 to 24:00
h: m
Time is recorded up to 24 hours
Optional function for electronic trip relay
The electronic trip relay can be checked by this field test device when the
breaker is at the test position or the disconnect position. The breaker will be tripped
when tested with this device in the “trip mode”.
Field test device
(Y-2005)
Option
Test items
LTD, STD, INST, GF, PAL
Range of signal output
Voltage signal equivalent to 1% to 2500% of Rated current In (CT rating)
Dimensions
220 mm (W) × 150 mm (H) × 340 mm (D)
Time counter
0.000 to 999.999 s
Input voltage
100-240 V AC 50/60 Hz
Weight
4.5 kg
Y-2005 specification
Example of display indication
Time after tripping
“HH:MM”
Bar graph display
current (A)
Current (A)
Harmonics (HI)
Maximum current (A)
Trip cause
Fault current
Time after tripping
Trip cause
With this MCR switch, at the time of breaker closing from OFF to ON the INST (Instantaneous)
characteristic works, and then after breaker is in closed (ON) position the INST characteristic becomes ineffective.
This controlling function of INST characteristic is useful for the protection on the short-circuit fault at the time of
closing and also for expanding the selective combination with branch breakers after closed.
MCR is equipped as standard.
MCR
Standard
The ground fault protection (GF) of several hundred amperes is available.
This function can be selected for trip or alarm (no trip). Power supply is necessary
for this function, even if there is not power supply, it can function at 0.2 × In or higher.
Ground fault protection (GF)
Option
Setting item
Mark
Adjustable setting range
Accuracy
Factory default value
GF pick-up current
Ig
0.1-0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-
1.0
× In
±20%
1.0
GF time
Tg
±20%
(Note)
3 s (TRIP)
Alarm output
–
Setting for TRIP: Self-holding/Setting for ALARM: Automatic reset
‒
Setting for TRIP (Self-holding)
3
-1.5-0.8-0.5-0.3-0.15-<0.1 - <0.1-0.15-0.3-0.5-0.8-1.5-3 s
TRIP
ALARM
Note) When Tg = “0.1” setting, operating time is 0.1 s ±50%.
When Tg = “0.15” setting, operating time is 0.15 s ±30%.
(at 1.5 × Ig)
Trip cause
INST
: Short circuit current trip.
STD
: Large current in short time STD range.
LTD
: Overcurrent in LTD range.
GF
: Ground fault protection. (Option)
