Omicron CP TD1 Reference Manual

157
Appendix
12.9.7 Delta-Connected Windings
For delta-connected windings, R12, R23 and R31 cannot be measured directly
but calculated from the measured Ra, Rb and Rc values.
Ra = R1 + R2
Rb = R2 + R3
Rc = R3 + R1
Y connection without Neutral:
Rc - Rb + Ra = 2 R1
 R1 = (Rc + Ra - Rb) / 2
Ra - Rc + Rb = 2 R2
 R2 = (Ra + Rb - Rc) / 2
Rb - Ra + Rc = 2 R3
 R3 = (Rb + Rc - Ra) / 2
Closed delta winding
R12 = R1 + R2 + (R1 x R2) / R3
R23 = R2 + R3 + (R2 x R3) / R1
R31 = R3 + R1 + (R3 x R1) / R2
Figure 12-15 Delta-connected windings

Omicron CP TD1 Specifications

General

Brand	Omicron
Model	CP TD1
Category	Measuring Instruments
Language	English