Page 35 - 通用电气（中国）有限公司

EntelliGuard* L

Short-circuit Protection ST and STDB

Overcurrent Protection against short-circuit:
ST, STDB
The EntelliGuard* GT-L Electronic Trip and
breaker combination can be equipped with
a number of different short-circuit protection
devices each with their own distinctive
properties and field of application. SET
SET UP CURRENT SHORT TIME
The Timed Short-circuit Protection Device is METER 1000A PICKUP
3
designed to offer selectivity over a defined x lr
current range and offers a unique combination STATUS Ie ST BAND Overcurrent protection
2
of multiple time bands and current settings. SLOPE
EVENTS OFF
To allow selectivity with a wide range of
different downstream devices whilst not
unnecessarily sacrificing clearing time, EntelliGuard GT Electronic Trip Unit
17 different time bands are available. The 10
device has an adjustment range of 1.5 to 12 - Time Current Curve
(+-10%) times the chosen Long Time current ST- Protection Device
2
value (Ir) in steps of 0,5 (pick up setting). I t OFF-
- STDB bands Intro
The graph indicates 6 of the available 17 time
bands across the full adjustment range.
The table contains the minimum delay time A
and the maximum total interruption times for 0,8 1
all time band settings. 0,6
Timed Short-circuit (ST) Protection I t bands 0,4 B
2
(slope)
2
The ST device can also be set to a I t slope 0,2
2
value. The available multiple I t slopes are
normally used to achieve selectivity with 0,1 C
downstream fuses or to improve selectivity
with downstream circuit breakers.
D
The device has an adjustment range of 1.5 to
12 (+-10%) times the chosen Long Time current
value (Ir) in steps of 0.5 (pick up setting) and
17 time bands. 0,01 E
Tripping Time In Seconds (s)
2
There are three available I t slopes
(K set at 3,8 or 18) . X

0,001
0 , 1 0 1 0 , 0 0 1 0 0 , 0 0
x Breaker Rating In
]

2
Short time tripping times at indicated levels per selected STDB band - I t OFF, in milliseconds
x Ir Min 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Max
1.5 x Tripping 90 100 110 120 170 190 240 270 300 340 400 450 600 700 800 900 1000
±10% Non Tripping 30 40 50 60 110 130 180 210 240 280 340 390 540 640 740 840 940
12 x Tripping 90 100 110 120 170 190 240 270 300 340 400 450 600 700 800 900 1000
±10% Non Tripping 30 40 50 60 110 130 180 210 240 280 340 390 540 640 740 840 940

B.5