6
Interior Connection
△
Wiring
Wiring mode of interior connection
△
wired winding is as shown in Figure 5.
In this test, input impedance is connected to c and output impedance to a
，
on behalf of a
phase.
In this test, input impedance is connected to a and output impedance to b
，
on behalf of b
phase.
In this test, input impedance is connected to b and output impedance to c
，
on behalf of c
phase.
Figure 5 Interior Connection Δ Wiring
Theoretically, the two non-measured windings that are connected in series first and
then connected with the circuit in parallel in interior connection Δ wiring mode have some
effect over the testing process. However, it is believed that their effect over the
non-measured coil is negligible when attenuation is more than 10dB.
Exterior connection Δ wiring
Wiring mode when windings are disengaged in measurement is as shown in Figure 6.
It is regarded interior connection Δ wiring if connections are not disengaged, when the
wiring mode is as shown in Figure 7.
In this test, input impedance is connected to x and output impedance to a
，
on behalf
of a phase.
In this test, input impedance is connected to y and output impedance to b
，
on behalf
of b phase.
In this test, input impedance is connected to z and output impedance to c
，
on behalf
of c phase.
