ABB REG650 Technical Manual page 156

Section 7
Current protection
150
voltage is a combination of the apparent voltage (85%) and a memory voltage
(15%). The following combinations are used.
Phase-phase short circuit:
= -
U U U
refL L 1 2 L 1 L 2
EQUATION1449 V1 EN
= -
U U U
refL L 2 3 L 2 L 3
EQUATION1450 V1 EN
= -
U U U
refL L 3 1 L 3 L 1
EQUATION1451 V1 EN
Phase-earth short circuit:
=
U U I
refL 1 L 1 dirL 1
EQUATION1452 V1 EN
=
U U I
refL 2 L 2 dirL 2
EQUATION1453 V1 EN
=
U U I
refL 3 L 3 dirL 3
EQUATION1454 V1 EN
= -
I I I
dirL L 1 2 L 1 L 2
= -
I I I
dirL L 2 3 L 2 L 3
= -
I I I
dirL L 3 1 L 3 L 1
=
I
L 1
=
I
L 2
=
I
L 3
1MRK 502 034-UEN -
(Equation 33)
(Equation 34)
(Equation 35)
(Equation 36)
(Equation 37)
(Equation 38)
Technical Manual