Black Box IC109A-R2 Instrukcja Instalacji Pobierz pdf (Strona 134)

128

Commissioning

Checking Residual Current/

Voltage Input Connections

Description

Perform this check when the residual voltage is:

1 delivered by three VTs on the secondary circuits

connected in a broken delta arrangement

2 when the residual current is obtained by a specific

sensor such as:

b CSH120 or CSH200 zero sequence CT

b CSH30 interposing ring CT (whether installed on

the secondary circuit of a single 1A or 5A CT that

encompasses the three phases, or on the neutral

connection of the three 1A or 5A phase CTs)

b other zero sequence CT connected to an

ACE990 interface

Block Diagram

Procedure

1 Connect according to the diagram below:

b the generator voltage terminals to the voltage test terminal box using the plug

provided

b a wire between the generator current terminals to inject current into the

primary circuit of the zero sequence CT or CT, with:

v the wire passing through the zero sequence CT or CT in the Pa-Pb

direction

v with P1 the bus end and P2 the cable end

2 Turn the generator on.

3 Apply a V

voltage, set to the rated secondary voltage of the VTs, connected in

a broken delta arrangement (V

s / 3 or Uns/3)

4 Inject a current set to 5A in phase with the voltage applied (generator phase

displacement α(V

, I) = 0°)

DE50714

Note: the number of CTs/VTs connected to the Sepam™ current/voltage connector phase inputs is given as an example and is not used for the test.

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

DE50359

Sepam™ Series 80 is equipped with two

independent residual current inputs which

may be connected to a zero sequence CT

installed on the cables, tank grounding

cable or neutral point of a transformer, or on

the grounding cable of a motor or generator. In some

cases, reading of the

0 or

’0 angle is impossible due

to the position of the zero sequence CT (for example,:

transformer tank grounding cable or neutral point) or

because only one of the two Ir or Vr measurements is

necessary or possible. When this is the case, simply

check the measured residual current value Ir or I’r.

5 Use the SFT2841 software to check the following:

b the value indicated for the measured Ir residual current is approximately

equal to 5A

b the value indicated for the measured V0 residual voltage is approximately

equal to the rated primary phase-to-neutral voltage of the VTs

p = V

p / 3)

b the value indicated for the phase displacement ϕr(Vr, Ir) between the Ir

current and Vr voltage is approximately equal to 0°

6 Use the same procedure if the I’r input is connected. When this is the case, the

phase displacement angle you want to check is ϕ’r(Vr, I’r), between the I’r current

and Vr voltage.

7 Turn the generator off when you finish the test.

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