Black Box IC109A-R2 Installationshandbuch PDF herunterladen (Seite 135)

12963230-216-229-B1

Commissioning

Checking Residual Current

Input Connections

Description

Perform this check when residual current is measured

by a specific sensor such as:

b CSH120 or CSH200 zero sequence CT

b CSH30 interposing ring CT (installed either on

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

which 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,

Perform this test when residual voltage is calculated in

Sepam™, or cannot be calculated, as in an assembly

with two VTs connected through their primary circuits.

These are not available for the protection function.

Procedure

1 Connect according to the diagram below:

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

primary circuit of the zero sequence CT or CT, with the wire passing through

the zero sequence CT or CT in the Pa-Pb direction, with Pa the bus end and

Pb the cable end

b when applicable, the generator voltage terminals to the voltage test terminal

box, so as to only supply Sepam’s phase A voltage input and therefore obtain

a residual voltage Vr = Va.

2 Turn the generator on.

3 When applicable, apply a VN voltage set to the rated secondary phase-to-neutral

voltage of the VT (V

s = V

s / 3).

4 Inject an I current set to 5A, and when applicable in phase with the VN voltage

applied (specifically, generator phase displacement α(VN, I) = 0°).

Block Diagram

DE50711

Note: the number of CTs connected to the Sepam™ current 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

can 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,for example, transformer neutral point or tank

grounding cable) or because only one of the two I0 or

V0 measurements is necessary or possible. When this

is the case, simply check the measured residual current

value Ir or I’r.

Use the SFT2841 software to check the following:

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

equal to 5A

b when applicable, the value indicated for calculated Vr residual voltage is

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

(VNp = V

LLp

/ 3)

b when applicable, 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 to be checked is ϕ’r(V’r, I’r), between the I’r current

and Vr voltage.

7 Turn off the generator when the test is completed.

Check Appendix A, GFC Measuring Table for more information.

Van

Vbn

Vcn

Van

Vbn Vcn

Van = Vr

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