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PCD231B PCD231B101 ABB Excitation system control module
PCD231B PCD231B101 ABB Excitation system control module
Our Email: 2235954483@qq.com
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At IDMT characteristic, the operate time of the stage is dependent on the voltage
value: the greater the deviation from the setting value, the shorter the operate time.
Three time/voltage curve groups are available: A, B and C.
An overvoltage stage starts when the measured voltage exceeds the setting value of
the stage. An undervoltage stage starts when the measured voltage drops below the
setting value of the stage. However, the IDMT calculation does not start until the
deviation between the measured voltage and the setting value exceeds 3 percent.
The operate time accuracy stated in technical data applies when the deviation is 10
percent or higher.
Characteristics of the overvoltage stages
The IDMT characteristic curve groups A and B are designed for overvoltage stages
U> and U>>/U2>. Stages U> and U>>/U2> can be configured to use different
characteristics. The relationship between time and voltage at IDMT characteristic
can be expressed as follows:
t[s]= k 480
32 U U>
U>
0.5
+ 0.05
p
×
× ⎛
⎝
⎜ ⎞
⎠
⎟ − − (3)
t = operate time
k = time multiplier k> or k>>
U = measured voltage
U> = set start value U> or U>>/U2>
p = constant (see Table 5.1.4.6.-2)
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