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Example for use of GRP_OFF signal in FXDSIGN

The Restricted earth fault function REFPDIF 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.

I3PW1CT1

I3PW2CT1

I3P

REFPDIF

IEC09000619_3_en.vsd

IEC09000619 V3 EN

Figure 102: REFPDIF 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.

I3PW1CT1

I3PW2CT1

I3P

REFPDIF

GRP_OFF

FXDSIGN

IEC09000620_3_en.vsd

IEC09000620 V3 EN

Figure 103: REFPDIF function inputs for normal transformer application

11.6 Boolean 16 to integer conversion B16I

11.6.1 Identification

Function description

IEC 61850

identification

IEC 60617

identification

ANSI/IEEE C37.2

device number

Boolean 16 to integer conversion B16I - -

Section 11 1MRK 505 291-UEN A

Logic

254

Application manual

ABB REQ650 User Manual

Other manuals for ABB REQ650