KRB-5404
47
5-2-2. R characteristic for general feeder
Characteristic settings and characteristic curves of the type AGR-21BR,31BR OCR (with R characteristic) are shown in Table 24
and Figs. 41 - 47 respectively.
Table. 24 Characteristic settings of type AGR-21BR,31BR OCR (with R characteristic)
Setting item
Symbol
Setting range
○
1
Rated current
◯
2
I
n
CT rated primary current [
I
CT
] × (0.5-0.63-0.8-1.0) (A)
Applied [
I
CT
] (A)
200
400
800
1000
1250
1600
2000
2500
3200
4000
Rated
current
[
I
n
]
(A)
[
I
CT
] × 0.5
100
200
400
500
630
800
1000
1250
1600
2000
[
I
CT
] × 0.63
125
250
500
630
800
1000
1250
1600
2000
2500
[
I
CT
] × 0.8
160
320
630
800
1000
1250
1600
2000
2500
3200
[
I
CT
] × 1.0
200
400
800
1000
1250
1600
2000
2500
3200
4000
Long time delay trip
(LT)
◯
3
◯
5
Current setting
(continuous energization)
I
R
[
I
n
] × (0.8-0.85-0.9-0.95-1.0-NON) (A), Tolerance:
5%
◯
4
Time setting
t
R
(1-2-3-4-5-6.3-6.8-10) (sec) at 300% of [
I
R
], Tolerance:
20%, +0.15 s
–0 s
Protection type
–
SIT: I
0.02
t, VIT: I t, EIT: I
2
t, 3IT: I
3
t, 4IT: I
4
t
Short time delay trip
(ST)
◯
5
Current setting
I
sd
[
I
n
] × (1-1.5-2-2.5-3-4-6-8-10-NON) (A), Tolerance:
15%
◯
4
Time setting
◯
6
t
sd
Relaying time (ms.)
50
100
200
400
600
800
Resettable time (ms.)
25
75
175
375
575
775
Max. total clearing time (ms.)
120
170
270
470
670
870
I
2
t protection type
I
2
t
t
sd
OFF/ON
◯
7
Instantaneous trip
(INST/MCR)
Current setting
I
i
[
I
n
] × (2-4-6-8-10-12-14-16-NON) (A), Tolerance:
20%
◯
4
INST/MCR
–
INST/MCR
Ground fault trip
(GF)
Current setting
◯
8
I
g
[
I
CT
] × (0.1-0.2-0.3-0.4-0.6-0.8-1.0-NON) (A), Tolerance:
20%
◯
4
Time setting
t
g
Relaying time (ms.)
100
200
300
500
1000
2000
Resettable time (ms.)
75
175
275
475
975
1975
Max. total clearing time (ms.)
170
270
370
570
1070
2070
I
2
t protection type
I
2
t
t
g
OFF/ON
◯
7
Mode
–
TRIP/AL/OFF
◯
9
N-phase protection
(NP)
○
3
◯
5
Current setting
(continuous energization)
I
N
[
I
CT
] × (0.4-0.5-0.63-0.8-1.0-NON) (A), Tolerance:
5%
Time setting
t
R
Depends on the long time delay trip pickup timing. Activated at 300% of [
I
N
].
Negative-phase
sequence protection
(NS)
◯
10
Current setting
I
NS
[
I
n
] × (0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0) (A), Tolerance:
10%
Time setting
t
NS
(0.4-0.8-1.2-1.6-2-2.4-2.8-3.2-3.6-4) (sec) at 150% of [
I
NS
], Tolerance:
20%, +0.15 s
–0 s
Mode
–
TRIP/AL/OFF
◯
9
Line side ground
fault protection
(REF)
Current setting
I
REF
[
I
CT
] × (0.1-0.2-0.3-0.4-0.6-0.8-1.0-NON) (A), Tolerance:
20%
◯
4
Line side ground fault
protection bias current
I
REF2
[
I
CT
] × (0.1-0.2-0.3-0.5-0.7-0.9-1.1-1.3-1.5) (A), Tolerance:
20%
Time setting
–
Instantaneous
Mode
–
TRIP/AL/OFF
◯
9
Contact overheat
monitoring
(OH)
Temperature setting
–
155
C
Time setting
–
Instantaneous
Mode
–
TRIP/AL/OFF
◯
9
Zone interlock (Z)
◯
11
Current setting
–
Interlock with short time delay trip pickup current
Time setting
–
50 ms. or less
Pretrip alarm (PTA)
Current setting
I
P1
[
I
n
] × (0.75-0.8-0.85-0.9-0.95-1.0) (A), Tolerance:
7.5%
Time setting
t
P1
(5-10-15-20-40-60-80-120-160-200) (sec) at not less than [
I
P1
], Tolerance:
15%, +0.1s
–0 s
Mode
–
AL/OFF
◯
12
Undervoltage alarm
◯
13
◯
14
Voltage setting
–
[
V
n
] × (0.4-0.6-0.8) (V), Tolerance:
5%
Time setting
–
(0.1-0.5-1-2-5-10-15-20-30-36) (sec) at voltage setting or less, Tolerance:
±
15%, +0.1s
–0s
Recovery voltage setting
◯
15
–
[
V
n
] × (0.8-0.85-0.9-0.95) (V), Tolerance:
5%
Mode
–
AL/OFF
◯
12
◯
1
Underlined values are default settings.
◯
2
A change in rated current setting results in changes in long time delay trip, short time delay trip, instantaneous strip, pretrip alarm and negative-phase sequence protection trip
pickup current settings accordingly.
◯
3
The operating time (
t
) at a long time delay (or N-phase protection) trip pickup current setting is given by
t
= 0.0222×
t
R
/
{
(
i
/
I
R
)
0.02
–1 }
±20% +0.15
–0 [sec] (I
0.02
t protection type)
t
= 2
×
t
R
/
{
(
i
/
I
R
)
–1 }
±20% +0.15
–0 [sec] (It protection type)
t
= 8
×
t
R
/
{
(
i
/
I
R
)
2
–1 }
±20% +0.15
–0 [sec] (I
2
t protection type)
t
= 26
×
t
R
/
{
(
i
/
I
R
)
3
–1 }
±20% +0.15
–0 [sec] (I
3
t protection type)
t
= 80
×
t
R
/
{
(
i
/
I
R
)
4
–1 }
±20% +0.15
–0 [sec] (I
4
t protection type)
(
I
R
: Long time delay or N-phase protection trip pickup current setting,
i
: Overcurrent value,
t
R
: Time setting)
◯
4
NON setting disables protective functions. If the short time delay trip function and the instantaneous trip (or MCR) function are both attempted to be set to NON, however, the
fail-safe operates so that:
• When the short time delay trip function has been set to NON, the instantaneous trip function cannot be set to NON or MCR.
• When the instantaneous trip function has been set to NON or MCR, the short time delay trip function cannot be set to NON.
◯
5
The short time delay trip function has precedence over the long time delay trip
function. The OCR operates at the short time delay trip timing even in those current
ranges in which the long time delay trip time setting is shorter than the short time
delay time setting.
◯
6
If DC24V zone interlock power is not provided between
□
33
and
□
34
, the zone interlock
is inoperative and the short time delay trip function works with a total clearing time of
50 ms or less when a fault current is detected.
◯
7
Fig. 41 shows the operating characteristic at I
2
ON and I
2
OFF. When I
2
t is ON, the
OCR operates at fixed trip pickup current of 1000% of [
I
n
]. (100% of [
I
CT
] for ground
fault trip)
◯
8
The ground fault trip pickup current setting should not exceed 1200A.
◯
9
"TRIP" means the breaker is tripped open and operation indication is provided, "AL"
means the breaker is not tripped and only operation indication is provided, and "OFF"
means the breaker is not tripped open and no operation indication is provided.
◯
10
The operating time (
t
) at a negative-phase sequence protection trip pickup current
setting is given by
t
= 1.5 ×
t
NS
×
I
NS
/
i
±20% +0.15
–0 [sec]
(
I
NS
: Negative-phase sequence protection trip pickup current setting,
i
: Overcurrent value,
t
NS
: Time setting)
(
i
is fixed to 3 ×
I
NS
when
i
>
3 ×
I
NS
)
◯
11
Activated only when the fault point is within the zone covered by the breaker.
◯
12
"AL" means operation indication is provided and "OFF" means no operation indication is provided.
◯
13
Provides an alarm and delivers contact output when the voltage of the main circuit decreases to the voltage setting or lower for longer than the time setting. The alarm ceases
when the main circuit voltage returns to the recovery voltage or higher.
◯
14
When this capability is used in conjunction with the undervoltage trip device (UVT), an alarm may be provided after tripping operation of the breaker depending on the voltage
setting.
◯
15
The undervoltage alarm capability does not work if the main circuit voltage is originally under the recovery voltage.
Fig. 41 I
2
t characteristic
