Operation Principle - ABB RELION 620 Series Technical Manual

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Protection functions

32P executes on the direction of positive-sequence power and not the

value. If overpower or underpower is needed, refer to 32O and 32U. 32P

is generally used for directional controls.

Operation principle

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

parameter values are "Enable" and "Disable".

The operation of 32P can be described with a module diagram. All the modules in the

diagram are explained in the next sections.

GUID-D45D62FF-12ED-47FA-9B97-FF5BF0251AFE-ANSI V1 EN

Functional module diagram

Directional detector

The Directional detector module compares the angle of the positive-sequence current I1

to the angle of the positive-sequence voltage V1. Using the positive-sequence voltage

angle as reference, the positive-sequence current angle is compared to the Characteristic

angle setting. If the angular difference is within the operating sector selected with the

Directional mode setting, the Enable signal is sent to Timer.

The operating sector is defined by the setting Min forward angle, Max forward angle, Min

reverse angle and Max reverse angle. The options that can be selected for the Directional

mode setting are "Forward" and "Reverse".

1MAC504801-IB E

620 series ANSI

Technical Manual

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