Question

Lo ?? ? Lo Lo Lo 40 No Lo N Figure. 1 star connection Figure.2 triangle connection It is known that the line voltage of the three-phase power supply is 220V, the load of each phase is a resistive load, and the resistance value is 2.5?? Table 2 the measurement data for star connection Symmetric load With neutral line Without neutral line $U_{12}$ Line voltage $U_{23}$ $U_{31}$ $U_1$ Phase voltage $U_2$ $U_3$ $I_1$ Current $I_2$ $I_3$ Table 3 the measurement data for triangle connection Voltage $U_{12}$ $U_{23}$ $U_{31}$ Line current $I_1$ $I_2$ $I_3$ Phase current $I_{12}$ $I_{23}$ $I_{31}$ power $3P_t$ Symmetric load Experimental report: 1. List the experimental data. 2. Explain the relationship between phase and line values of voltage and current when the symmetric load are star connection and triangle connection.

          Lo
??
?
Lo
Lo
Lo
40
No
Lo
N
Figure. 1 star connection
Figure.2 triangle connection
It is known that the line voltage of the three-phase power supply is 220V, the load of each
phase is a resistive load, and the resistance value is 2.5??
Table 2 the measurement data for star connection
Symmetric load
With neutral line Without neutral line
$U_{12}$
Line voltage
$U_{23}$
$U_{31}$
$U_1$
Phase voltage
$U_2$
$U_3$
$I_1$
Current
$I_2$
$I_3$
Table 3 the measurement data for triangle connection
Voltage
$U_{12}$
$U_{23}$
$U_{31}$
Line current
$I_1$
$I_2$
$I_3$
Phase current
$I_{12}$
$I_{23}$
$I_{31}$
power
$3P_t$
Symmetric load
Experimental report:
1. List the experimental data.
2. Explain the relationship between phase and line values of voltage and current when the
symmetric load are star connection and triangle connection.

Lo
??
?
Lo
Lo
Lo
40
No
Lo
N
Figure. 1 star connection
Figure.2 triangle connection
It is known that the line voltage of the three-phase power supply is 220V, the load of each
phase is a resistive load, and the resistance value is 2.5??
Table 2 the measurement data for star connection
Symmetric load
With neutral line Without neutral line
U12
Line voltage
U23
U31
U1
Phase voltage
U2
U3
I1
Current
I2
I3
Table 3 the measurement data for triangle connection
Voltage
U12
U23
U31
Line current
I1
I2
I3
Phase current
I12
I23
I31
power
3Pt
Symmetric load
Experimental report:
1. List the experimental data.
2. Explain the relationship between phase and line values of voltage and current when the
symmetric load are star connection and triangle connection.

Added by Rafael D.

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