KRB-5426c
-8-
Table 2 Characteristic settings parameter (continued)
Protective
function
Selection
Setting range
STEP
Remarks
Unbalanced
current protection
setting (LVL1)
TRIP / ALARM / OFF
-
-
"Unbalanced current
protection setting (LVL1)" is
50% ±2% (relative to the set
value) of "Unbalanced current
protection setting (LVL2)".
Time limit: 5 s (Not
adjustable)
Unbalanced
current protection
setting (LVL2)
MAX T
TRIP / ALARM / OFF
(0.20 –0.40)
×
("In" or maximum
phase current,
whichever is greater)
0.01 ±2%
(relative to the set value)
Characteristic: I2t = C (C = 0.01)
* Set time limit (MAX T in
"Unbalanced current protection
setting (LVL2)")
-
(5 –30)s
1s (±10%)+0.1s-0s
Time limit is applicable when
10% is set
Time limit is counted after
"Unbalanced current
protection setting (LVL1)" is
activated.
Directional Ground
fault
detection
current
TRIP / ALARM / OFF
(1.0 –10.0)mA
0.1mA±10%
Secondary
Directional Ground
fault detection
voltage
-
(0.050 –0.150) X
V0n
0.001 ±25%
V0n: 190V
Phase
-
(0 –90)deg or OFF
10deg
Setting “OFF” means that no
direction is set.
Phase difference
-
(0.1 –10.0)s
0.1s (
±15%)+0.1-0s
Phase difference between -3
V and I0
The relay is activated when I0
is within 90° of -3V.
Temperature
sensor
RTD / THERMISTOR
-
-
*1
Type
NTC / PTC
-
-
*2
Temperature
sensor
detection
(LVL1)
TRIP / ALARM / OFF
(0 –250)℃
1℃ (±1%)±1℃
TEMP1 (When RTD is set)
(0.1 –30.0)kΩ
0.1kΩ (±5%)±0.1kΩ
OHM1 (When
THERMISTOR is set)
(0 –60)s
1s (±5%)+0.1-0s
Temperature
sensor
detection
(LVL2)
TRIP / ALARM / OFF
(0 –250)℃
1℃ (±1%)±1℃
TEMP2 (When RTD is set)
(0.1 –30.0)kΩ
0.1kΩ (±5%)±0.1kΩ
OHM2 (When
THERMISTOR is set)
(0 –60)s
1s (±5%)+0.1-0s
Negative phase
sequence current
protection
TRIP / ALARM / OFF
-
-
Checked within 0.5 s
The relay is activated when the
current value reaches or exceeds
the "overload pick up" setting.
External anomaly
detection 1
TRIP / ALARM / OFF
-
-
This function is enabled only
when specified in "Input setting 1
(IN1)".
External anomaly
detection 2
TRIP / ALARM / OFF
-
-
This function is enabled only
when specified in "Input setting 2
(IN2)".
Open-phase
protection
TRIP / ALARM / OFF
-
-
The relay is activated when
the current value is equal to or
less than 50% of the set
current value (In) .
Current
unbalance factor
(0.30 –0.65) X In
0.01 ±10%
Operating time
(0.5 –5.0)s
0.1s ±10%+0.1-0s
*1: The customer must specify this item when placing an order.
*2: When RTD is selected, "PTC" is fixed when displayed.
*3: Negative phase sequence current: Ins =
(IR^2 + IS^2 + 2 × IR × IS × cos
)/
3
(IR: R-phase current, IS: S-phase current, θ: Phase difference with S-phase current shifted from R-phase current by 60°)
