■Earth fault protection
If=
Acting property
Setting current
(0.2~1.0)In + OFF (with 160A as the minimum and 1200A as the maximum.
OFF means it only alarms without tripping)
＜0.8If without actions
≥1.0 If delayed action
.47.
Air Circuit Breaker
e.Instruction to technical property
Ir2=
Ir3=
Acting property
Acting property
Setting current
Setting current
g.Instruction to short time-delay property
(1.5~15) Ir1 + OFF (exit position)
≤0.9Ir2 without actions
＞1.1Ir2 delay action
(0.1~1)s (0.1s level error)
±10% (intrinsic 40ms)
Curve is the same as overload long delay, but curve speed is 10 times faster.
Standard + OFF
Ts=
Precision
Inverse-time delay (s)
(Corresponding 2Ir1)
Inverse-time property
Short delay inverse-time thermal memory (15min)
h.Instruction to short circuit instantaneous property
1.01n~50kA/75kA/100kA+OFF (Exit position)
≤0.85Ir3 without actions
＞1.15Ir3 with actions
Note: When controller is frame I (Inm=2000A), rectified value of instantaneous protection is 1.0In~50kA+OFF; when controller is frame II
(Inm=3200A), rectified value of instantaneous protection is 1.0In~75kA+OFF; When controller is frame III (Inm=6300A), rectified value
of instantaneous protection is 1.01n~100kA+OFF.
i.Earth fault or residual current protective property: t=TG×KG×If/I
Ir1=
Acting property
Setting current
Property curve
Curve speed
Precision
Inverse-time (s)
(Corresponding 2Ir1)
■Electrical machine protection
Thermal memory (30min, could be eliminated
while power-off)
Standard + OFF
100% or 50% (Applicable to 3P+N or 4P products)
N-phase overload and over-current property
Note: When N-phase is 50%, protective settings are treated as 50% for N-phase. If long delay setting is 2000A, long delay setting for phase A, B
and C is 2000A, and 1000A for phase N.
(0.4~1.25)In + OFF (Exit position)
I≤1.05Ir1 without actions in 2h
I＞1.20Ir1 with actions while it's less than 1h
Curve 1~curve 5, could be rectified, rectified as curve 3 for ex-factory
IEC255 standard, 80 level points totally, could be rectified
±10% (intrinsic 40ms)
5000
2000
1000
500
200
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.3 0.4 0.5 0.6 0.8 1 2 3 4 5 6 8 10 20
t(s)
Xin1
Express inverse-time 1
(Ordinary use)
Express inverse-time 2
(Motor protection)
Express inverse-time
Standard
inverse-time
High-voltage fuse
compatibility
f. Overload long time-delay protection
■Power distribution or motor protection
(0.4~1.0)In + OFF (Exit position)
I≤1.05Ir1 without actions in 2h
I＞1.20Ir1 with actions while it's less than 1h
Curve 1~curve 5, could be rectified, rectified as curve 3 for ex-factory
IEC255 standard, 80 level points totally, could be rectified
±10% (intrinsic 40ms)
Ir1=
Acting property
Setting current
Property curve
Curve speed
Precision
Inverse-time (s)
(Corresponding 2Ir1)
.46.
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