5.3.2 Function block
A071286 V2 EN
Figure 291: Function block
5.3.3 Functionality
The master trip function TRPPTRC is used as a trip command collector and
handler after the protection functions. The features of this function influence the
trip signal behavior of the circuit breaker. The minimum trip pulse length can be
set when the non-latched mode is selected. It is also possible to select the latched or
lockout mode for the trip signal.
5.3.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
When the TRPPTRC function is disabled, all trip outputs intended
to go through the function to the circuit breaker trip coil are blocked!
The operation of the tripping logic function can be described with a module
diagram. All the modules in the diagram are explained in the next sections.
A070882 V4 EN
Figure 292: Functional module diagram
Timer
The duration of the TRIP output signal from TRPPTRC can be adjusted with the
Trip pulse time setting when the "Non-latched" operation mode is used. The pulse
length should be long enough to secure the opening of the breaker. For three-pole
tripping, TRPPTRC has a single input OPERATE, through which all trip output
signals are routed from the protection functions within the IED, or from external
protection functions via one or more of the IED's binary inputs. The function has a
Section 5 1YHT530004D05 D
Protection related functions
552 615 series
Technical Manual
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