. 4 9 .
Air Circuit Breaker
Wiring diagram of earth fault protection
PEN
CT
L1
L2
L3
intelligent
controller
3PT type
CT
PE
L3
L2
L1
N
intelligent
controller
4PT type
CT
PE
N
L1
L2
L3
intelligent
controller
(3P+N) T method
externally connected zero sequence current inductor type 1 applied(ZCT)
ZCT
PEN
L1
L2
L3
CT
intelligent
controller
ZCT
N
PE
L1
L2
L3
CT
intelligent
controller
externally connected zero sequence current inductor type 2 applied(ZCT)
externally connected zero sequence current inductor type 3 applied(ZCT)
ZT100
N
PE or PEN
L1
L2
L3
CT
intelligent
controller
j.Load monitor protection property
load monitor type 2 property curve
30
10000
5000
2000
1000
500
200
100
50
20
10
5
2
1
0.5
0.2
0.05
0.02
0.01
t(a)
0.01 0.02 0.03 .1
.2
.3
.4 .5 .6
.8 1
2
3
4
5 6
8
10
20
xIn
Tr2=(1/4)t
L
Tr1=(1/2)t
L
t1=(15~480)S
Ic2=(0.2~1)In
Ic1=(0.2~1)In
Ir1=(0.4~1)In
load type method 1 property curve
10000
5000
2000
1000
500
200
100
50
20
10
5
2
1
0.5
0.2
0.05
0.02
0.01
t(a)
0.010.02 0.03.1
.2
.3
.4 .5 .6
.8 1
2
3
4
5 6
8
10
20 30
xIn
tr2=1/4t
L
Ic2=(0.2~1)In
Ic1=(0.2~1)In
Ir1=(0.4~1)In
tr2=60s
tr1=1/2t
L
t1=(15~480)S
Technical parameter:
■
Load monitor type 1
I
C
1=
I
c
2=
Acting property
Acting property
Rectified current
Rectified current
Property curve
Curve speed
Property curve
Curve speed
Inverse-time (s)
Maximal inverse-
time delay (s)
■
Load monitor type 2
I
c
1=
I
c
2=
Acting property
Acting property
Rectified current
Rectified current
Property curve
Curve speed
Inverse-time (s)
(0.2~1.0)In + OFF (OFF means exit position)
≤
1.05Ic1 without action
>
1.21c1 delay relay action
The same as overload long delay
Could be set separately (Setting content is the same as that of overload long delay)
(0.2~1.0)In + OFF (OFF means exit position)
≤
0.9Ic2 without action
Fixed as 60s
±
10% (Intrinsic 40ms)
St OFF
Fixed delay (s)
Precision
Thermal memory (30min, could be eliminated while power-off)
(0.2~1.0)In + OFF (OFF means exit position)
≤
1.05Ic1 without action
>
1.21c1 delay relay action
The same as overload long delay
Could be set separately (Setting content is the same as that of overload long delay)
(0.2~1.0)In + OFF (OFF means exit position)
≤
1.05Ic2 without action
>
1.21c2 delayed relay
The same as overload long delay
Could be set separately (Setting content is the same as that of overload long delay)
Rectified current
k.Protective property on unbalance current
40%~100% + OFF (Level difference 0.1, OFF means exit)
≤
0.9
δ
without actions
>
1.1
δ
delay action
(0.1~1.0)s (Level difference 0.1, OFF means exit)
±
10% (Intrinsic 40ms)
δ
=
Action or alarm property
Delay time (s)
T
δ
=
Precision
l.Communication networking
Make key-lock at “communication” position, connect to secondary terminals “10#” and “11#” through cable to achiveve the communication
function.
Modbus protocol networking
RS232
RS485
Rt
NA1
NA1
NA1
Converter
Monitor host
Communication connection diagram (Modbus protocol)
. 4 8 .
■
Earth fault protection
Inverse-time (s)
(Corresponding 2Ir1)
(0.1~1.0)s + OFF (Level difference 0.1s, OFF means it only alarms without tripping.)
T
G
=
Inverse-time cutting
coefficient K
G
Precision
±
10% (intrinsic 40ms)
1.5~6 + OFF (Level difference 0.5, OFF means earth fault is definite-time)
Setting current
(0.1~1.0)Io + OFF (Level different 0.01A, OFF means exit position)
<
0.8If without actions
≥
1.0 If delayed action
Curve 1~curve 5, could be rectified, rectified as curve 3 for ex-factory
(1.5~6)s + OFF (Level difference 0.5s, OFF means is definite-time)
±
15%
I
f
=
Acting property
Property curve
T
G
=
Precision
Delay (s)
Summary of Contents for NA1-1000
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