ABB SYN 5201 Operating Instructions Manual page 40

Operating Instructions
The maximum phase shift ±  max permitted for paralleling is calculated from the greatest
phase shift which occurs plus a reserve. ±  max is limited by the current i T = f(U1, U2,
x ) flowing after paralleling and if the flow of power in a particular direction is to be
T
avoided. In the latter case, the corresponding parameter (-  max or +  max) is set to
zero.
Maximum voltage difference, overexcited -  Umax and underexcited +  Umax
Maximum permitted amplitude difference between the two voltages.

usual values for generators: 1 to 5 %

usual values for synchronous lines 3 to 10 %
Recommended setting: default setting
Maximum voltage Umax
No paralleling takes place above this voltage. The default setting of 120 % can be
changed if necessary.
Minimum voltage Umin
No paralleling takes place below this voltage.
The default setting of 80 % can be changed if necessary.
4.2.4 Parameter group Dead Bus Conditions
Maximum zero voltage U0max
Maximum voltage at which the SYNCHROTACT 5 still recognises the measuring
voltages as zero voltage. A different value should only be set if necessary.
Release of the measuring voltages as no-voltage U1not, U2not, 1*2not
These parameters only need to be set for paralleling of no-voltage lines. The
synchronization of two existing voltages is not affected by the programming. The
following relationships apply:
U1not U2not
OFF OFF
ON OFF
OFF ON
ON ON
OFF OFF
ON OFF
OFF ON
ON ON
abb
ABB Switzerland Ltd
Template: CHIND Techn doc stand, A4 P de, R1.DOT; Filename: 3BHS109762E01 D.doc; Print: 12/6/2011 5:48:00 PM; Save: 12/1/2011 2:37:00 PM; CHIND No. 3BHS109763 ZAB D14 Rev. -; I-Q
1*2not Conditions
OFF Both U1 and U2 must be present (default).
OFF Only the voltage U1 can be missing, U2 must be present.
OFF Only the voltage U2 can be missing, U1 must be present.
OFF One of the two voltages can be missing, the other must be
present.
ON Both voltages can be missing (simultaneously)
ON The voltage U1 or both voltages can be missing.
ON The voltage U2 or both voltages can be missing.
ON One of the two voltages or both voltages can be missing.
Document No Art Part
3BHS109762 E01
SYN 5201/SYN 5202
Language Revision page
en D 40