Instruction manual

KRB-5377
45
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
CT rated primary current [I
CT
] × (0.5-0.63-0.8-1.0) (A)
Applied [I
CT
] (A) 200 400 800 1250 1600 2000 2500 3200 4000
[ICT] × 0.5 100 200 400 630 800 1000 1250 1600 2000
[ICT] × 0.63 125 250 500 800 1000 1250 1600 2000 2500
[ICT] × 0.8 160 320 630 1000 1250 1600 2000 2500 3200
Rated current
◯
2 In
Rated
current
[In]
(A)
[ICT] × 1.0 200 400 800 1250 1600 2000 2500 3200 4000
Current setting
(continuous energization)
IR [I
n
] × (0.8-0.85-0.9-0.95-1.0-NON) (A), Tolerance: ±5%
◯
4
Time setting tR (1-2-3-4-5-6.3-6.8-10) (sec) at 300% of [I
R
], Tolerance: ±20%, +0.15 s –0 s
Long time delay trip
(LT)
◯
3
◯
5
Protection type – SIT: I
0.02
t, VIT: I t, EIT: I
2
t, 3IT: I
3
t, 4IT: I
4
t
Current setting Isd [I
n
] × (1-1.5-2-2.5-3-4-6-8-10-NON) (A), Tolerance: ±15%
◯
4
tsd Relaying time (ms.) 50 100 200 400 600 800
Resettable time (ms.) 25 75 175 375 575 775Time setting
◯
6
Max. total clearing time (ms.) 120 170 270 470 670 870
Short time delay trip
(ST)
◯
5
I
2
t protection type I
2
t tsd OFF/ON
◯
7
Current setting Ii [I
n
] × (2-4-6-8-10-12-14-16-NON) (A), Tolerance: ±20%
◯
4
Instantaneous trip
(INST/MCR)
INST/MCR – INST/MCR
Current setting
◯
8 Ig [I
CT
] × (0.1-0.2-0.3-0.4-0.6-0.8-1.0-NON) (A), Tolerance: ±20%
◯
4
tg Relaying time (ms.) 100 200 300 500 1000 2000
Resettable time (ms.) 75 175 275 475 975 1975Time setting
Max. total clearing time (ms.) 170 270 370 570 1070 2070
I
2
t protection type I
2
t tg OFF/ON
◯
7
Ground fault trip
(GF)
Mode – TRIP/AL/OFF
◯
9
Current setting
(continuous energization)
IN [I
CT
] × (0.4-0.5-0.63-0.8-1.0-NON) (A), Tolerance: ±5%
N-phase protection
(NP) ○
3
◯
5
Time setting tR Depends on the long time delay trip pickup timing. Activated at 300% of [I
N
].
Current setting INS [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 tNS (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
Negative-phase
sequence protection
(NS)
◯
10
Mode – TRIP/AL/OFF
◯
9
Current setting IREF [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
IREF2 [ICT] × (0.1-0.2-0.3-0.5-0.7-0.9-1.1-1.3-1.5) (A), Tolerance: ±20%
Time setting – Instantaneous
Line side ground
fault protection
(REF)
Mode – TRIP/AL/OFF
◯
9
Temperature setting – 155°C
Time setting – Instantaneous
Contact overheat
monitoring
(OH)
Mode – TRIP/AL/OFF
◯
9
Current setting – Interlock with short time delay trip pickup current
Zone interlock (Z)
◯
11
Time setting – 50 ms. or less
Current setting IP1 [I
n
] × (0.75-0.8-0.85-0.9-0.95-1.0) (A), Tolerance: ±7.5%
Time setting tP1 (5-10-15-20-40-60-80-120-160-200) (sec) at not less than [I
P1
], Tolerance: ±15%, +0.1s –0 sPretrip alarm (PTA)
Mode – AL/OFF
◯
12
Voltage setting – [Vn] × (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
– [Vn] × (0.8-0.85-0.9-0.95) (V), Tolerance: ±5%
Undervoltage alarm
◯
13
◯
14
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× tR/{ ( i/IR )
0.02
–1 } ±20% +0.15 –0 [sec] (I
0.02
t protection type)
t = 2 × tR/{ ( i/IR ) –1 } ±20% +0.15 –0 [sec] (It protection type)
t = 8 × t
R/{ ( i/IR )
2
–1 } ±20% +0.15 –0 [sec] (I
2
t protection type)
t = 26 × tR/{ ( i/IR )
3
–1 } ±20% +0.15 –0 [sec] (I
3
t protection type)
t = 80 × t
R/{ ( i/IR )
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, tR: 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 [In]. (100% of [ICT] 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 × tNS × INS/i ±20% +0.15 –0 [sec]
(I
NS
: Negative-phase sequence protection trip pickup current setting, i: Overcurrent value, tNS: 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