Application Examples - ABB REG670 Applications Manual

Relion 670 series generator protection

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1MRK 502 071-UEN -

Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062

Application manual

are increased √3 times (1.732 times) in comparison with star connected CTs

lead by 30° the primary winding currents (this CT connection rotates currents by

30° in anti-clockwise direction)

do not contain zero sequence current component

For DAB delta connected main CT ratio shall be set for √3 times smaller in RET 670

then the actual ratio of individual phase CTs. The "StarPoint" parameter, for this

particular connection shall be set ToObject. It shall be noted that delta DAB connected

main CTs must be connected exactly as shown in figure 54.

For more detailed info regarding CT data settings please refer to the three application

examples presented in section

Application Examples

Three application examples will be given here. For each example two differential

protection solutions will be presented:

First solution will be with all main CTs star connected.

Second solution will be with delta connected main CT on Y (that is, star)

connected sides of the protected power transformer.

For each differential protection solution the following settings will be given:

Input CT channels on the transformer input modules.

General settings for the transformer differential protection where specific data

about protected power transformer shall be entered.

Finally the setting for the differential protection characteristic will be given for all

presented applications.

Example 1: Star-delta connected power transformer without on-load

Single line diagrams for two possible solutions for such type of power transformer

with all relevant application data are given in figure 55.

Differential protection

"Application

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