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Protected Object

CT 800/1

Wye Connected

IED

ANSI11000026-5-en-.vsd

B C

SMAI_20_2

BLOCK

REVROT

^GRP2_A

^GRP2_B

^GRP2_C

^GRP2N

AI3P

AI1

AI2

AI3

AI4

AIN

ANSI11000026 V5 EN-US

Figure 14: Wye connected three-phase CT set with its wye point away from the protected object

In the example, everything is done in a similar way as in the above described example

(Figure

13). The only difference is the setting of the parameter CTStarPoint of the used

current inputs on the TRM (item 2 in Figure 14 and 13):

• CTprim=600A

• CTsec

=5A

• CTWyePoint=FromObject

The ratio of the first two parameters is only used inside the IED. The third parameter as

set in this example will negate the measured currents in order to ensure that the

currents are measured towards the protected object within the IED.

A third alternative is to have the residual/neutral current from the three-phase CT set

connected to the IED as shown in Figure

14.

1MRK 511 401-UUS A Section 4

Analog inputs

Bay control REC670 2.2 ANSI 71

Application manual

ABB rec670 Applications Manual

Other manuals for ABB rec670