2 Functions
130
7ST6 Manual
E50417-G1176-C251-A3
Figure 2-39
Connection of an external protection device to the internal automatic reclosure
function
Thermal Auto-
reclose Function
The thermal auto reclose function behaves largely in the same way as the general
auto reclose function, but is in part controlled by its own parameters and outputs its
own indications.
It differs from the general auto reclose function in the following points:
• The thermal auto reclose function cooperates only with the device-internal thermal
overload protection. In the integrated thermal overload protection, pickup and TRIP
coincide; therefore there are no action times.
• The thermal overload protection does not have multiple stages. Therefore no dis-
tinction is made between the 1st reclosure cycle and the subsequent cycles. As a
result, the thermal auto reclose function has no cycle-specific parameters.
• There is no settable dead time. The dead time is dynamic, and results from the tem-
perature curve. The reclosure temperature is set in the thermal overload protection.
• Separate parameters exist for switching the thermal auto reclose function on and
off. Likewise, there are separate indications for the status of the thermal auto
reclose function.
For circuit breaker supervision, interaction with a synchro-check, the manual-close
feature and the dynamic blocking time, the parameters of the general auto reclose
function are used.
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