Operating Instructions SYN 5201/SYN 5202
Document No Art Part Language Revision page
abb
ABB Switzerland Ltd
3BHS109762 E01
en D 13
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
Frequency matcher with variable pulse durations
The frequency matcher issues a command the length of which is proportional to the
current slip. The proportionality factor df/dt can be adapted to the governor. The
frequency matcher aims at a value midway between the nearer slip limit and zero. The
adjusting command length tpf is:
dtdf
s
s
tpf
/
2
max
Between 1/3 and 2/3 of smax there is a range where no adjustment takes place. The
adjusting pulse is discontinued as soon as the slip passes through zero. The command
length does not fall below a settable minimum value. After an adjusting command, the
system waits for the set pulse interval ts f so that the actual values can stabilise to the
new setpoint.
S00005
df
dt
tp f
ts f
-smax
s = 0
1/2*(+smax)
+smax
s
t
Time
Adjusting pulse Pulse interval time
Speed (Slip)
Slip
Set point governor
Range w/o adjusting pulses over-synchronous
admissible paralleling range
Range w/o adjusting pulses sub-
synchronous
Range for lower commands
Range for higher commands
Range for lower commands
sub-synchronous range over-synchronous range
Slip
S00004
-smax
2/3*(-smax)
1/3*(-smax)
1/3*(+smax)
2/3*(+smax)
+smax
s=0
s
Range for raise pulses
Range for lower pulses
Range for raise pulses
Range for lower pulses
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