Electrical coupling

Coupling 1Ph

 

 

 

P = U ² / r

 Coupling mono

if U = u

P = p: The surface charge density (W / cm ²) is preserved

Coupling series 1Ph

 

P = U ² / U ² re = / 2r

Coupling monosif U = u 

P = p / 2: The surface charge density (W / cm ²) is divided by 4

Coupling parallel 1Ph

 

P = U ² / re = 2.U ² / r

re = r / 2

Coupling monopsi U = u 

P = 2p: The surface charge density (W / cm ²) is preserved

Coupling 3Ph

 

 

P = 3.U ² / r

 

Delta-V2if U = u

P = 3p: The surface charge density (W/cm2) is preserved

if U = \ / ¯ 3u

P = 9p: The surface charge density (W/cm2) is multiplied by 3 (it may destroy the resistance)

if U = u / \ / ¯ 3

P = p: The surface charge density (W/cm2) is divided by 3

3Ph Star Coupling

 

 

P = 3.U ² / r = U ² / r

Coupling star-V2if U = u \ / ¯ 3

P = 3p: The surface charge density (W/cm2) is preserved

if U = u 

P = p: The surface charge density (W/cm2) is divided by 3

if U = u / \ / ¯ 3

P = p / 3: The surface charge density (W/cm2) is divided by 9

Other couplings 3Ph star

 

P = 3.U ² / re = U ² / re

Coupling etoileP                        Wye

Other couplings 3Ph triangle

 

P = 3.U ² / Re

 

Delta             Coupling triangleP

 

Reminder: equivalent resistance Re

Resistors r1, r2, ... rn in series

 

 

Resistors r1, r2, ... rn parallel

Re = r1 + r2 + ... + Rn

If r1 = r2 = ... = Rn = r Re = n.r

 

1 / Re = 1 / r1 + 1/r2 + ... 1 / rn

If r1 = r2 = ... Rn = r = 1 / Re = n.1 / r Re = r / n

 

NOTE: If p is the power of the heater at the rated voltage u and U the voltage, the total power P and the drying surface (W / cm ²) are equal to:

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