Application Guide
P12x/EN AP/A96
MiCOM P120/P121/P122/P123
Page 23/80
7. RECTIFIER
PROTECTION
Rectifiers require a specific inverse time protection curve.
Protecting a rectifier is different from protecting conventional overcurrent applications. In fact,
a large number of rectifiers can withstand relatively long periods of overcharge without being
damaged. To give an idea, they can generally withstand 150 % of the load for 2 hours and
300 % for 1 minute.
A typical application is shown on the diagram below.
+
-
A
B
C
C
B
A
N
Rs
Protection
Transformer
Rectifier
P0025ENa
FIGURE 6: PROTECTION FOR SILICON RECTIFIERS
10000
1000
100
10
1
0.1
1
2
3
4
5
6
7
8
Typical thermal limit
for silicon rectifier
Protection curve
Instantaneous
overcurrent
Typical
load area
Time (seconds)
Multiple of rated current
P0026ENa
FIGURE 7: MATCHING CURVE TO LOAD AND THERMAL LIMIT OF RECTIFIER
Содержание MiCom P120
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