This func
Ɵ
on sets the
Ɵ
me delay before the breaker trips when
a ground-fault pickup current has been detected.
The Ground Fault Delay has three variants, a type with a
Į
xed
Ɵ
me delay bands, two I2T slopes or a steeper fuse type slope.
2.2.3.6
থںࠤቱԍࢺ
(GF)
Mpro S
和
Mpro N
႙ۉጱྃ੩ഗᅜስದԢথںࠤቱԍࢺ
ጎዃLjጎዃሞᇆᇱሶฉሏႜ
(GFsum)
ăጎዃ૧ᆩୟ
ഗዐڦాዃ
Rogowski
دߌഗ֪ଉᆶ၎࿋ࢅዐႠۉୁժऺ
໙ᇆጺࢅăሞ
3
टୟഗฉስথںࠤቱ้Ljٷևݴᆌᆩ
DŽ
4
၍DžዐႴᄲ๑ᆩڼ
4
߲ेڦྔևدߌഗăୟഗᇑྔ
ևدߌഗኮक़ڦਐፌٷྺ
10
DŽ
33
ᆈDžă
GF
๔ۯۉୁኵڦࠅֶݔྷྺยዃۉୁ
(Ig)
ڦ
15%
ăথںࠤቱ
๔ۯۉୁยዃྺ
x CT
DŽ
CT=
ୟഗ
In
DžLjօྺ
0.01 x CT
ă
ுᆶޤዺۉᇸ้Ljยዃݔྷྺ
0.2
ڟ
1 x CT
ăথᆶ
+24V DC
੦ۉᇸ้Ljยዃݔྷકٷྺ
0.1
ڟ
1 x CT
ă
ࠀీยዃॠ֪ڟথںࠤቱ๔ۯۉୁ้ୟഗཌቄኮമڦ
ჽ้ă
থںࠤቱჽ้ᆶ!4!߲ՎଉLjਏᆶࠦۨڦჽ้ݔྷLj3!߲!
J3U!ၽ୲ईᅃ߲ড۸ڦභີૌ႙ၽ୲ă
TRIP UNIT
ཌቄڇᇮ
֡ፕ
2
.
2
2.2-05
2.2.3.6 Ground Fault Protec
Ɵ
on (GF)
2.2.3.6.1 Ground-Fault Delay (GFDB)
!
2.8
ǖ߲߳ۨڦ!
GFDB
!ݔྷዐኸۨڪपူথںࠤቱཌቄ้क़!
－
I²t
LjਸLjڇ࿋ྺࡹ௱!
(²)
Table 2.8 : Ground Fault tripping
Ɵ
mes at indicated levels per selected GFDB band -I²t, OFF, in Milliseconds (²)
(1)
থᆶޤዺۉᇸ
(24V DC)
!้Lj
0.1
ڟ!
0.2
ڦेยዃݔྷᆩă
(2)
၂๖ྺࢤڦ้क़ޙࢇ
IEC 60479-1
ࢅ
IEC 60364
Քጚڦᄲ൱DŽೕ୲ྺ
50
თ࣍ཉॲူDžă
(1) When an auxiliary supply is connected (24V DC) a extra se
ƫ
ng range of 0,1 to 0,2 becomes available.
(2)Timings in Red meet the requirements of the IEC 60479-1 and IEC60364 standards at a frequency of 50 cycles.
2.2.3.6.1
থںࠤቱჽ้
(GFDB)
The GT-E, GT-S & GT-N Trip Units can op
Ɵ
onally be equipped
with a ground fault protec
Ɵ
on that operates on a residual
principle. (GFsum) The device u
Ɵ
lizes the internal Rogowski
sensors in the circuit breaker to measure and to residually sum
all phase and neutral currents. When the groundfault op
Ɵ
on is
chosen on a 3 pole breaker an addi
Ɵ
onal 4th external sensor is
required for most applica
Ɵ
ons (4 wire). The distance between
the circuit breaker and the external sensor is limited to 10
metres.
The GF pickup value tolerance band is 15% of the set current (Ig).
The ground fault pickup se
ƫ
ngs are set as mul
Ɵ
ples of x CT
(CT=In of the circuit breaker) in steps of 0.01 x CT.
Without an auxiliary supply the se
ƫ
ng range is limited to 0.2 to
1 xCT. When a +24V DC contro voltage supply is connected the
se
ƫ
ng range is increased to 0.1 to 1 x CT.
x Ir
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0.2 x ± 10%
ཌቄ
110
120
140
170
190
240
270
340
400
450
600
700
800
900
փཌቄ
50
60
80
110
130
180
210
280
340
390
540
640
740
840
0.6 x ± 10%
ཌቄ
110
120
140
170
190
240
270
340
400
450
600
700
800
900
փཌቄ
50
60
80
110
130
180
210
280
340
390
540
640
740
840
NF1:ဣଚگუഘୟഗ
