ABB RELION REX640 Technical Manual page 1106

Protection and control

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Protection functions

Function block

Figure 620: Function block

Functionality

The multipurpose protection function MAPGAPC is used as a general protection

with many possible application areas as it has flexible measuring and setting

facilities. The function can be used as an under- or overprotection with a settable

absolute hysteresis limit. The function operates with the definite time (DT)

characteristics.

The function contains a blocking functionality. It is possible to block function

outputs, the definite timer or the function itself.

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "On" and "Off".

The operation of MAPGAPC can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 621: Functional module diagram

Level detector

The level detector compares AI_VALUE to the

mode setting defines the direction of the level detector.

Operation setting. The

Start value setting. The Operation

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