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122
Thermal phase overload protection
(THOL)
where I
is the secondary rated current of the main CT and I
SEC
ondary rated current of the main CT.
The relay setting value is given in percentage of the secondary base current value, I
associated with the current transformer input I1. The value is given from this formula:
Is
SE C
⋅
-------------- - 100
I
=
set
I
1b
The parameters for the thermal phase overload protection function are set via the local
HMI or PST (Parameter Setting Tool). Refer to the Technical reference manual for set-
ting parameters and path in local HMI.
For temperature compensation, input No. 1 on the MIM module No.1 is always used
(fixed configuration). Necessary settings for the MIM module are On/Off for activation,
time intervals for measuring of current, upper and lower value for the current input and
temperatures corresponding to max. respectively min. current. These settings can only
be made via the PST setting tools.
&KDSWHU
&XUUHQW
is the primary sec-
PRIM
,
1b
(Equation 59)
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