Black Box IC109A-R2 Installationshandbuch PDF herunterladen (Seite 131)

12563230-216-229-B1

Commissioning

Checking Input Connections

Single-Phase Generator &

Voltages Delivered by 2 VT

Description

Perform this check when:

b the input foltages are supplied by two VTs as a

set

b the VTs connect phase-to-phase in the primary

With this configuration, the residual voltage must be

obtained outside Sepam™ by using three VTs that

have their secondaries connected in a broken delta

arrangement.

You can also perform this check when the residual voltages are either:

b obtained by other means

b used for purposes other than protection (control, monitoring, alarm)

Block Diagram

DE50709

* 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 by using the plugs provided, according to

the block diagram.

2 Turn the generator on.

3 Apply (via the test box) the voltage delivered at the V-N terminals of the generator, set to 3/2 multiplied by the rated secondary phase-to-

phase voltage of the VTs (that is, 3 V

/ 2) between terminals 1-2 of Sepam’s voltage inputs.

4 Inject the generator I current, set to the rated secondary current of the CTs (that is, 1A or 5A) and in phase with the V

voltage applied

(specifically, generator phase displacement α(V-N, I) = 0°) to Sepam’s phase a current input (via the test 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 (I

Np).

b the value indicated for Van phase-to-neutral voltage is approximately equal to the rated primary phase-to-neutral voltage of the VT

p = V

p / 3)

b the value indicated for the phase displacement ϕ1(V1, I1) between the Ia current and Va voltage is approximately equal to 0°

6 Proceed in the same way to check the Ib, Vb, ϕb(Vb, Ib) values:

b apply the generator V

voltage set to 3V

LLs

/ 2 in parallel between terminals 1-2 and 4-2 of Sepam’s voltage inputs (via the test box).

b inject a current set to 1A or 5A and in phase opposition with the V

voltage

(that is, α(V

, I) = 180°) to Sepam’s phase b current input (via the test box)

b obtain Ib ≅ INp, Vbn ≅ V

p = V

p/3 and ϕb ≅ 0°. In the absence of residual voltage, Vbn = 0, Vab = 3V

LLp

/ 2

7 Check the Ic, Vcn, ϕc(Vcn, Ic) values as well:

b apply the generator V

voltage set to 3V

LLs

/ 2 between terminals 4 and 2 of Sepam’s voltage inputs (via the test box)

b inject a current equal to 1A or 5A and in phase with the V

voltage (namely, α(V

, I) = 0°) to Sepam’s phase c current input (via the

test box)

b obtain Ic ≅ INp, Vcn ≅ V

LnL

p = V

p / 3 and ϕc ≅ 0°. In the absence of residual voltage, Vcn = 0, Vab = 3V

LLp

/ 2

8 Turn the generator off.

Van

Vbn

Vcn

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