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heat up and cause faults in a short time is solved by thermal overload protection functions in
modern systems.
Thermal Overload Protecions are shown in IEC 60617 Standards with I
Standards with PH_PTTR_A; in IEEE / ANSI Standards with 49-A.
EŞİK-1 PH_PTTR_A
The menu view is as follows.
The settings that can be made in the menu are described below.
4.3.2.3.1
Protection
It can be selected 'Active' or 'Passive'.According to the treshold situation, the protection is
activated in the active state and disabled in the passive state.
4.3.2.3.2
I
>
Θ
The thermal protection shows the ratio of the nominal current of the device to the I
transformer primary nominal current and is called the thermal protection set current. This
value, for example, when thermal protection of measured 1600 kVA (34.5 / 0.4) kV power
Thermal Overload Protection
IEC 61850
Thermal Overload Protection Function Symbols
IEC 60617
IEEE-ANSI
I
>-A
49-A
Θ
60
>-A; in IEC 61850
Θ
current
n
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