ABB Relion 670 Series Applications Manual page 367

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1MRK 505 370-UUS Rev. K

Example for use of GRP_OFF signal in FXDSIGN

The Restricted earth fault function (REFPDIF) (87N) can be used both for auto-transformers and normal

transformers.

When used for auto-transformers, information from both windings parts, together with the neutral point

current, needs to be available to the function. This means that three inputs are needed.

ANSI11000083 V1 EN-US

Figure 195: REFPDIF (87N) function inputs for autotransformer application

For normal transformers only one winding and the neutral point is available. This means that only two

inputs are used. Since all group connections are mandatory to be connected, the third input needs to be

connected to something, which is the GRP_OFF signal in FXDSIGN function block.

ANSI11000084 V1 EN-US

Figure 196: REFPDIF (87N) function inputs for normal transformer application

Busbar protection REB670

Application manual

REFPDIF (87N)

ANSI11000083_1_en.vsd

REFPDIF (87N)

ANSI11000084_1_en.vsd

Relion reb670