Function Block - ABB 615 series Technical Manual

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Protection functions

Function block

GUID-2C0FEE94-AF1B-4C4E-9DE2-9D1164E19992 V1 EN

Function block

Functionality

The directional reactive power undervoltage protection function 32Q-27 is used at the grid

connection point of distributed power generating units as stipulated by various grid codes

to prevent voltage collapse of the grid due to network faults. 32Q-27 measures phase

voltages and current at the grid connection point. The generating facility is disconnected

from the network with a specific time delay if all phase voltages decrease and remain at

or below the specified limit and if reactive power is simultaneously consumed (that is,

under-excitation operation).

The function contains a blocking functionality to block function outputs, timer or the

function itself.

Operation principle

The function can be enabled and disabled with the Operation setting. The corresponding

parameter values are "Enable" and "Disable".

The operation of 32Q-27 can be described using a module diagram. All the modules in the

diagram are explained in the next sections.

1MAC059074-MB A

615 series ANSI

Technical Manual

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