Black Box IC109A-R2 Installationshandbuch PDF herunterladen (Seite 130)

124

Commissioning

Checking Input Connections

Single-Phase Generator &

Voltages Delivered by 3 VT

Block Diagram

DE50708

* Detection of Plugged Connector (required for proper operation. Installed manually)

Procedure

1 Connect the single-phase voltage and current generator to the corresponding

test terminal boxes, using the plugs provided, according to the block diagram

above.

2 Turn the generator on.

3 Apply the generator V-N voltage set to the rated secondary phase-to-neutral

voltage of the VTs (that is, V

s = V

LLs

/3) between Sepam’s phase a voltage

input terminals (via the test box).

4 Inject the generator I current, set to the rated secondary current of the CTs

(namely, 1A or 5A) and in phase with the V-N voltage applied

(specifically,generator phase displacement α(V

, I) = 0°) to Sepam’s phase a

current input (via the text box).

5 Use the SFT2841 software to check the following:

b the value indicated for Ia phase current is approximately equal to the rated

primary current of the CT

b the value indicated for Va phase-to-neutral voltage is approximately equal to

the rated primary phase-to-neutral voltage of the VT (V

p = V

/ 3)

b the value indicated for the phase displacement ϕa(Van, Ia) between the Ia

current and Van voltage is approximately equal to 0°

6 Proceed in the same way by circular permutation with the phase b and c voltages

and currents, to check the Ib, Vbn, ϕb(Vbn, Ib) and Ic, Vcn, ϕc(Vcn, Ic) values

7 Turn the generator off.

Van

Vbn

Vcn

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Black Box IC109A-R2 Installationshandbuch Seite 130