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參數(shù)資料
| 型號： | LM1851 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Ground Fault Interrupter(電源接地失敗中斷器) |
| 中文描述： | 接地故障遮斷（電源接地失敗中斷器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 87K |
| 代理商： | LM1851 |
PRODUCT SPECIFICATION
LM1851
7
where:
T = integration time
V = threshold voltage
I = average fault current into CT
(6)
therefore:
(7)
I
120 V
rms
R
B
)
------------------------------------
è
+
RG
RN
------RN
è
=
heavy fault
current generated
(swamps I
TH
)
portion of fault
current shunted
around GFI
1000 turns
----1 turn
è
1
è
0.91
)
′
′
′
current
division of
input sense
transformer
CT
charging
on half-
cycles
only
rms to
average
conversion
CT
500
0.4
1.6
′
1000
′
′
0.91
(
)
′
--------------------------------------------------17.5
0.008
′
=
CT
0.01
m
F
=
In practice, the actual value of C
T
will have to be modified to
include the effects of the neutral loop upon the net charging
current. The effect of neutral loop induced currents is diffi-
cult to quantize, but typically they sum with normal fault
currents, thus allowing a larger value of C
T
.
For UL943 requirements, 0.015
m
F has been found to be the
best compromise between timing and noise.
For those GFI standards not requiring grounded neutral
detection, a still larger value capacity can be used and better
noise immunity obtained.
The larger capacitor can be accommodated because R
N
and
R
G
are not present, allowing the full fault current, I, to enter
the GFI.
In Figure 10, grounded neutral detection is accomplished by
feeding the neutral coil with 120 Hz energy continuously and
allowing some of the energy to couple into the sense trans-
former during conditions of neutral fault.
Transformers may be obtained from Magnetic Metals, Inc.,
21st Street and Hayes Street, Camden, NJ 08101—
(609) 964-7842.
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