nader NDW3 Series Manual page 25

3.4 Setting Values and Protective Features of Controller
Setting Values and Protective Features of Controller
Overload long time-delay protection NWK21/NWK31 &NWK22/NWK32
Current setting value Ir
4 types of protection curve
Standard power distribution
2
protection I t.Time setting
value Tr (@1.5 Ir )
1.5Ir
Tripping timetr
（s）
2.0 Ir
(Accuracy of
6.0 Ir
±10%)
7.2 Ir
Protection curve type
Protective features (accuracy
of ±10%)
Thermal memory time
Overload pre-alarm NWK21/NWK31 &NWK22/NWK32
Current setting value IP
Overload pre-alarm output
Internal & confidential file
文件编号:NDT2920213
(0.4~1.0 or 1.25 Note ) In or OFF (OFF-Function off)
Note: 1.0In in case of the power distribution protection; 1.25In in case of the generation
protection.
1） Standard power distribution protection I
Standard generator protection I
2) Express inverse time limit (power distribution protection) EI(G): tr= 1.25 Tr/（N
3) Express inverse time limit (motor protection) EI(M): tr = 1.3974 Tr×Ln[N
4) High-voltage fuse compatible HV: tr = 4.0625 Tr/（N
N= I/ Ir I—Fault current
current Tr—Long time-delay setting time
Description: NWK21/NWK31 controller has only standard power distribution protection I
NWK22/NWK32 controller provides 4 types of protection curves.
NWK21/NWK31: 15s, 30s, 60s, 120s, 240s, 480s
NWK22/NWK3: 15s, 30s, 60s, 120s, 240s, 360s, 480s, 600s, 720s, 840s, 960s
15 30 60
8.44 16.88 33.75
0.94 1.88 3.75
0.65 1.30 2.60
NWK22/NWK32: See the table below for the overload long-time delay protection action delay
time of C1~C16
Current (I/Ir)
≤1.05
≥1.3 (power distribution
protection)
≥1.2 (generator protection)
≥1.2 Ir
NWK21/NWK31: 30min (ON) or OFF
NWK22/NWK32: Instantaneous (function off ), 10min, 20 min, 30 min, 45min, 1h, 2h, 3h
Description: 1. The auxiliary power supply of controller features the thermal memory function;
turn off the auxiliary power supply to clear the thermal memory;
2. Setting OFF, it is possible to turn off the thermal memory function.
OFF+(0.75~1.05) Ir
The signal output is required to add a signal unit.
Without the signal output, observe the controller display screen or read from the display
indicator.
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2
t： tr= 2.25 Tr/ N
t（F） ： tr = 2.25 Tr/ N
2
tr—Long time-delay action time Ir—Long time-delay setting
120 240 360
67.5 135 202.5
7.5 15 22.5
5.21 10.4 15.6
Tripping time
> 2h Inaction
< 1h Action
< 1h Action
The action time is calculated according to four types of
protection formula or curve queried
文件版本:17
2
(factory default)
2
2 /（N 2 -1.15）]
4
-1）
480 600 720
270 337.5 405
30 37.5 45
20.8 26 31.3
2
-1）
2
t;
840 960
472.5 540
52.5 60
36.5 41.7