Instruction manual

KRB-5377
43
Characteristic settings and characteristic curves of the type AGR-21,31BL OCR (with L characteristic) are shown in Table 23 and
Fig. 38-40 respectively.
Table 23 Settings of type AGR-21BL,31BL OCR (with L characteristic)
Setting item S
y
mbol 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
[I
CT
] × 0.5 100 200 400 630 800 1000 1250 1600 2000
[I
CT
] × 0.63 125 250 500 800 1000 1250 1600 2000 2500
[I
CT
] × 0.8 160 320 630 1000 1250 1600 2000 2500 3200
Rated current
◯
2
In
Rated
current
[I
n
]
(A)
[I
CT
] × 1.0 200 400 800 1250 1600 2000 2500 3200 4000
pickup current
(continuous)
IR
[I
n
] × (0.8-0.85-0.9-0.95-1.0-NON) (A)
◯
4
• Non tripping at not more than [I
R
] × 1.05, Tripping at more than [I
R
× 1.05 and not more than [I
R
] × 1.2
◯
5
trip timing tR (0.5-1.25-2.5-5-10-15-20-25-30) (sec) at 600% of [I
R
], Tolerance: ±15%, +0.15s –0s
Long time delay trip
(LT)
◯
3
◯
7
COLD/HOT － COLD/HOT
◯
6
pickup current 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 775trip timing
◯
8
Max. total clearin
g
time
(
ms.
)
120 170 270 470 670 870
Short time delay trip
(ST)
◯
7
I
2
t mode I
2
t tsd OFF/ON
◯
9
pickup current Ii [I
n
] × (2-4-6-8-10-12-14-16-NON) (A), Tolerance: ±20%
◯
4
Instantaneous trip
(INST/MCR)
INST/MCR － INST/MCR
pickup current
◯
10 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 1975
trip timing
Max. total clearin
g
time
(
ms.
)
170 270 370 570 1070 2070
I
2
t mode I
2
t tg OFF/ON
◯
9
Ground fault trip
(GF)
Mode － TRIP/AL/OFF
◯
11
pickup current
(continuous)
I
N
[I
CT
] × (0.4-0.5-0.63-0.8-1.0)
• Non tripping at not more than [I
N
] × 1.05, Tripping at more than [I
N
] × 1.05 and not more than [I
N
] × 1.2 ○
5
trip timing tR Depends on the long time delay trip pickup timing. Activated at 600% of [I
N
].
N-phase protection
trip
(NP) ○
3
◯
7
COLD/HOT － Depends on the long time delay trip mode (COLD/HOT).
◯
6
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)
◯
12
Mode － TRIP/AL/OFF
◯
11
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
Time setting － Instantaneous
Line side ground
fault protection
(REF)
Mode － TRIP/AL/OFF
◯
11
Temperature setting – 155°C
Time setting – Instantaneous
Contact overheat
monitoring
(OH)
Mode – TRIP/AL/OFF
◯
11
Current setting – Interlock with short time delay trip pickup current
Zone interlock (Z)
◯
13
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 s
Pretrip alarm (PTA)
Mode － AL/OFF
◯
14
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
◯
17
– [Vn] × (0.8-0.85-0.9-0.95) (V), Tolerance: ±5%
Undervoltage alarm
◯
15
◯
16
Mode – AL/OFF
◯
14
◯
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 = -27.94 × tR × loge {1 - (1.125IR/i )
2
} ±15% +0.15 –0 [sec]
(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 is set to NON or MCR, the short time delay trip
function cannot be set to NON.
◯
5 A pickup current means the threshold by which the OCR determines whether or not
an overcurrent occurs. When the current flowing through the OCR exceeds the pickup
current setting provided that [I
R
] × 1.05 < pickup current setting ≤ [I
R
× 1.2, the OCR
starts counting the time for tripping. Once the current flowing through the OCR
reduces to less than the pickup current setting, time count is reset.
◯
6 In HOT mode, the OCR is actuated in shorter time than in COLD mode when an
overload occurs after a certain degree of load is maintained for a certain time of
period. The OCR is factory se to COLD mode. See 5-3-2-6 for how to set the OCR to
HOT mode. If the control power is lost, load data stored in HOT mode is cleared. Fig.
38 shows the operating time in COLD and HOT modes.
◯
7 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.
◯
8 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.
◯
9 Fig. 39 shows the operating characteristic at I
2
t ON and I
2
t 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)
◯
10 The ground fault trip pickup current setting should not exceed 1200A.
◯
11 "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.
◯
12 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
)
◯
13 Activated only when the fault point is within the zone covered by the breaker.
◯
14 "AL" means operation indication is provided and "OFF" means no operation indication is provided.
◯
15 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.
◯
16 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.
◯
17 The undervoltage alarm capability does not work if the main circuit voltage is originally under the recovery voltage.
Fig. 39 I
2
t characteristic
○
1
COLD mode
○
2
HOT mode where an overload occurs in a 50%-
load state:
Æ Operating time: Approx. 80 % relative to COLD
mode
○
3
HOT mode where an overload occurs in a 75%-
load state:
Æ Operating time: Approx. 60% relative to COLD
mode
○
4
HOT mode where an overload occurs in a
100%-load state:
Æ Operating time: Approx. 20% relative to COLD
mode
Fig. 38 COLD and HOT mode