Circutor computer SMART Series (Available until stock) Manuel d'utilisateur télécharger pdf (Page 24)

M98235701-03-12A

Computer Smart 6/Computer Smart 12

- 23 -

When the 440 V capacitor power reference is used for a 400 V grid voltage, the following table is used:

CT Ratio

)

Power in kvar of the smallest stage, in kvar, at 440 V

2.5 5.00 7.5 10.0 12.5 15.0 20.0 25.0 30.0 40.0 50.0 60.0 75.0 80.0

150/5 0.09

0.18

0.27

0.36

0.45

0.54

0.72

0.90

200/5 0.07

0.14

0.20

0.27

0.34

0.41

0.54

0.68

0.81

250/5 0.05

0.11

0.16

0.22

0.27

0.33

0.43

0.54

0.65

0.87

300/5 0.05

0.09

0.14

0.18

0.23

0.27

0.36

0.45

0.54

0.72

0.90

400/5

0.07

0.10

0.14

0.17

0.20

0.27

0.34

0.41

0.54

0.68

0.81

500/5

0.05

0.08

0.11

0.14

0.16

0.22

0.27

0.33

0.43

0.54

0.65

0.81

0.87

600/5

0.05

0.07

0.09

0.11

0.14

0.18

0.23

0.27

0.36

0.45

0.54

0.68

0.72

800/5 0.05

0.07

0.08

0.10

0.14

0.17

0.20

0.27

0.34

0.41

0.51

0.54

1000/5 0.04

0.05

0.07

0.08

0.11

0.14

0.16

0.22

0.27

0.33

0.41

0.43

1500/5 0.04

0.05

0.07

0.09

0.11

0.14

0.18

0.22

0.27

0.29

2000/5 0.04

0.05

0.07

0.08

0.11

0.14

0.16

0.20

0.22

2500/5 0.04

0.05

0.07

0.09

0.11

0.13

0.16

0.17

3000/5 0.04

0.05

0.07

0.09

0.11

0.14

4000/5 0.04

0.05

0.07

0.08

0.10

0.11

IMPORTANT!:

When the C/K adjustment is configured under the real values, there will be a series of continuous

connections and disconnections with minor load variations. (The system performs more operations than

those actually needed).

When the C/K adjustment is configured as "high" (10%), the regulator will need a higher reactive power

demand to perform the switching operations and, therefore, perform fewer operations.

Calculation of the C/K Factor

In the case of values that have not been included in the table, the C/K factor can be calculated as follows:

The reactive power of the smallest capacitor Q and the grid voltage U must be known. The current of this

capacitor will be then calculated as

The transformation ratio of the current transformer must also be known. This is the K factor:

sec

prim

IK /=

where: Iprim is the nominal current of the transformer's primary (for example, it would be 250A in a 250/5)

Isec is the transformer's secondary current. Usually 5 A.

Therefore, the C/K factor will be:

⋅⋅

For example: In a 400V unit, the smallest capacitor is 60 kVAr with a current transformer with a 500/5 ratio.

The calculation is as follows:

K factor

1005/500

Current of the smallest capacitor

6,86

4003

100060

⋅

C/K value

866,0

100

6,86

/ ===

When the 60kvar power is referenced to 440 V, it must be multiplied by Ugrid^2/440^2, so that the previous

example would be:

6.71

2^4403

400*100060

⋅

72,0/

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 32 33

Commentaires sur ces manuels

Pas de commentaire

Circutor computer SMART Series (Available until stock) Manuel d'utilisateur Page 24

Commentaires sur ces manuels

Produits connexes et manuels pour Instruments de mesure Circutor computer SMART Series (Available until stock)