Formule Electrotehnica

  • June 2020
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Id=Uf/Z

Uf

Z 400 0.6

Cc

Pi 14.4 36

666.67 Pc=Cc*Pi 0.4 Cc=Ci*Cs

Ci 14.4

Ic=Pi/(Uf*cosFI*eta)

1.2 Pi

12.5 Ic=Pi*Ci/(sqrt3*U*cosFI*eta)

Pi 541.27

Ic=Pc/(Uf*cosFI med)

Pc 1.13

cos Fimed=Ica/sqrt(Ica2+icr2)

Jp=Ip/Sf

0.5

U cos fi 75000 400

0.5

Ip

Ip=k*In

Du%=100*DU/UN

DU

Ic=P/U

P 0.1

Irem<=0.8*Uf*Sf/(ro*(1+m)*L)

Uf 0.04

m=Sf/Spe

sqrt(t)=KS/I

K

R=0.8*ro/L

U 23 220 Sf ro 220 0.3

tanFI=Q/P

L 2.3

Q 0.38

20 P

12 Uf

m 0.96

Spe 23

S I 115 0.23

ro 0.09

21

UN 2 220

0.3

0.05

0.8

In

Sf 0.01

eta

Icr 22

5

0.91

0.8

Sf 105 30

k 105

eta

Uf cos FImed 130 230 0.5

21

3.5

P=Uf*I*cosFI

Uf cos fi 2000 400

Ica 0.05

Cs 12

32 I

cosFi

120

2

1254 P=sqrt3*U*I*cosFi

220 U

3949.08 Q=Uf*I*sinFI

I 400

Uf 6

Q=sqrt3*U*I*sinFi

S=sqrt3*U*I

I

U

S=sqrt(P2+Q2)

I

P 5

cosFI=P/S

Q

P

4 S

5 Ssc

3

1

3

2.5 fr=sqrt(Ssc/Q)

2

1

2 Q

54

3 sinFI

2

42

1.73

sinFi

I

Uf

0.95

2

2

84

cosFI

I

U

0.95

6

1

8 S=Uf*I

6

6

2

curentul de defect

puterea de calcul

coeficientul de cerere

curentul de calcul al circuitului monofazat Ci 2 curentul de calcul al circuitului trifazat

curentul de calcul pentru circuite monofazate pt tablouri de iluminat si prize

factor de putere mediu al receptoarelor

densitatea de curent

curentul de pornire al motorului

pierderi de tensiune relative

curentul de calcul la circuitele de curent continuu L 500 curentul de reglaj al declansatoarelor electromagnetice

timpul in care conductorul atinge temp. limita admisa la scurtcircuit

rezistenta de dispersie a prizei de pamant

puterea activa monofazata

puterea activa trifazata

puterea reactiva monofazata

puterea reactiva trifazata

puterea aparenta monofazata

puterea reactiva trifazata

puterea aparenta

factorul de putere

frecventa de rezonanta

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