AEG ME09 - Ground Fault Protection (GF); Table 2.8: Ground Fault tripping times at indicated levels per selected GFDB band -I²t, OFF, in Milliseconds (2); Ground-Fault Delay (GFDB)

This funcƟon sets the Ɵme 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 Įxed
Ɵme delay bands, two I2T slopes or a steeper fuse type slope.
2.2.3.6 থںࠤቱԍࢺ (GF)
Mpro S和Mpro N ႙ۉጱྃഗᅜ჋ስದԢথںࠤቱԍࢺ
ጎዃLj޿ጎዃሞ฻ᇆᇱሶฉሏႜ (GFsum)ă޿ጎዃ૧ᆩ܏ୟ
ഗዐڦాዃ Rogowski دߌഗ֪ଉ໯ᆶ၎࿋ࢅዐႠۉୁժ
໙฻ᇆጺࢅăሞ 3 ܏ୟഗฉ჋ስথںࠤቱ้Ljٷևݴᆌᆩ
DŽ4 ၍DžዐႴᄲ๑ᆩڼ 4߲޹ڦྔևدߌഗă܏ୟഗᇑྔ
ևدߌഗኮڦ૗ፌٷྺ 10 ௝DŽ33 ᆈ؅Džă
GF ๔ۯۉୁኵڦࠅֶݔྷྺยዃۉୁ (Ig) ڦ15%ăথںࠤቱ
๔ۯۉୁยዃྺ x CTDŽCT=܏ୟഗ InDžLjօ׊ྺ 0.01 x CTă
ுᆶޤዺۉᇸ้Ljยዃݔྷྺ 0.2 ڟ 1 x CTă૶থᆶ+24V DC
዆ۉᇸ้Ljยዃݔྷકٷྺ 0.1 ڟ1 x CTă
޿ࠀీยዃ֪ڟথںࠤቱ๔ۯۉୁ้܏ୟഗཌቄኮമڦ
ჽ้ă
থںࠤቱჽ้ᆶ!4!߲ՎଉLjᆶࠦۨڦჽ้ݔྷLj3!߲!
J3U!ၽ୲ᅃ߲ড۸ڦභີૌ႙ၽ୲ă
TRIP UNIT
ཌቄڇᇮ
֡ፕ
2.2
2.2-05
2.2.3.6 Ground Fault ProtecƟon (GF)
2.2.3.6.1 Ground-Fault Delay (GFDB)
՗!2.8ǖ߲߳჋ۨڦ!GFDB!ݔྷዐኸۨڪူথںࠤቱཌቄ้!－ I²tLj܏Ljڇ࿋ྺࡹ௱!(²)
Table 2.8 : Ground Fault tripping Ɵmes at indicated levels per selected GFDB band -I²t, OFF, in Milliseconds (²)
(1) ૶থᆶޤዺۉᇸ (24V DC)!้Lj0.1 ڟ!0.2 ڦ޹ยዃݔྷᆩă
(2) ၂๖ྺࢤ෥ڦ้ޙࢇ IEC 60479-1 ࢅ IEC 60364 Քጚڦᄲ൱DŽೕ୲ྺ 50 თ࣍ཉူDžă
(1) When an auxiliary supply is connected (24V DC) a extra seƫng 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 opƟonally be equipped
with a ground fault protecƟon that operates on a residual
principle. (GFsum) The device uƟlizes the internal Rogowski
sensors in the circuit breaker to measure and to residually sum
all phase and neutral currents. When the groundfault opƟon is
chosen on a 3 pole breaker an addiƟonal 4th external sensor is
required for most applicaƟons (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 seƫngs are set as mulƟples of x CT
(CT=In of the circuit breaker) in steps of 0.01 x CT.
Without an auxiliary supply the seƫng range is limited to 0.2 to
1 xCT. When a +24V DC contro voltage supply is connected the
seƫng range is increased to 0.1 to 1 x CT.
x Ir 1234567891011121314
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:ဣଚگუഘ܏ୟഗ