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Overexcitation IDMT curves 1, 2 and 3
The base equation for the IDMT curves "OvExt IDMT Crv1", "OvExt IDMT Crv2" and
"OvExt IDMT Crv3" is:
t s
e
ak
b
M
c
( )
=
⋅
+ −
60
100
GUID-5D74EA35-03AD-44D1-9EE0-0B1999C55BF1 V1 EN
(Equation 122)
t(s) Trip time in seconds
M
Excitation level (V/f ratio or volts/hertz) in pu
k
Time multiplier setting
The constant "60" in
converts time from minutes to seconds.
Table 557:
Parameters a, b and c for different IDMT curves
Operating curve type
setting
a
b
c
OvExt IDMT Crv1
2.5
115.00
4.886
OvExt IDMT Crv2
2.5
113.50
3.040
OvExt IDMT Crv3
2.5
108.75
2.443
Section 4
1MAC059074-MB A
Protection functions
648
615 series ANSI
Technical Manual
Содержание Relion 615 series
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