5. Operation
43
5.1.
Basic Operation
⚫
Demand time and demand value of current demand
The demand time (t
o
) is the time until the measurement display value (I
o
) displays 95% of the input (I) when a
certain constant input (I) is given. To display 100% of the input (I), about three times more than the time (t
o
) is needed.
The demand value is the measurement display value with the above time characteristics, and it shows the overall average within
the demand time.
The demand value changes over a relatively long time, so it is not a
ffected by input changes within a short time.
Therefore, this is good for monitoring transformer overload.
Ⅰ
Measure
ment
displa
y value
Time (t)
（Ⅰ
0
）
t
0
(Time period)
0.95
Ⅰ
