Black Box IC109A-R2 Instrukcja Instalacji Pobierz pdf (Strona 129)

12363230-216-229-B1

Commissioning

Checking Input Connections

3-Phase Generator

Block Diagram: Two VTs Connected to Sepam™

DE50707

* Detection of Plugged Connector (required for proper

operation. Installed manually)

Procedure

Perform the following steps to check input connections when two or three VTs are

connected to Sepam™, as shown in the preceding two diagrams:

1 Connect the 3-phase voltage and current generator to the corresponding test

terminal boxes. Use the plugs provided, according to the appropriate diagram in

terms of the number of VTs connected to Sepam™.

2 Turn the generator on.

3 Apply the three generator voltages Van, Vbn and Vcn, balanced and set to the

rated secondary phase-to-neutral voltage of the VTs (that is, VNs = V

s/3).

4 Inject the three generator currents Ia, Ib and Ic, balanced and set to the rated

secondary current of the CTs (namely, 1A or 5A) and in phase with the voltages

applied (specifically, generator phase displacement:

α1(Van, Ia) = α2(Vbn, Ib) = α3(Vcn, Ic) = 0°).

5 Use the SFT2841 software to check the following:

b the value indicated for each of the phase currents Ia, Ib, and Ic is

approximately equal to the rated primary current of the CTs

b the value indicated for each of the phase-to-neutral voltages Van, Vbn, and

Vcn is approximately equal to the rated primary phase-to-neutral voltage of

the VT

p = V

p/3)

b the value indicated for each phase displacement ϕa(Van, Ia), ϕb(Vbn, Ib),

and ϕc(Vcn, Ic) between currents Ia, Ib or Ic and voltages Van, Vbn,or Vcn

respectively is approximately equal to 0°

6 Turn the generator off.

Van

Vbn

Vcn

Van

Vbn Vcn

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 163 164

Brak uwag

Black Box IC109A-R2 Instrukcja Instalacji Strona 129