JUMO 709040 TYA-110 thyristor power unit Operating Manual - Manual (Page 28)

4 Electrical connection
28 Power units 02.06
4.4 Star configuration: with star point connected to N
U
L
= phase-phase voltage P
tot
= total controlled power
U
N
= phase-neutral voltage I
L
= current in phase conductor
U
Thy
= voltage on thyristor power unit I
Thy
= current in thyristor power unit