Manual 37353A
MFR 13 Packages - Protection Relay
© Woodward
Page 39/91
Configuration Screens
Synchronizing
functions ON
Synchronizing functions
ON/OFF
ON
................ Synchronizing functions have been enabled. The subsequent screens
of this function are displayed.
OFF
.............. Synchronizing functions have been disabled. The subsequent screens
of this function are not displayed.
Synchronization
df max 0.00Hz
Maximum permissible positive slip frequency differential for synchr.
0.02 to 0.49 Hz
This parameter defines the upper permissible frequency differential limit for syn-
chronization. Prior to the control issuing a breaker closure command, the monitored
frequency differential of the two systems must be less than the value configured
here.
Positive slip refers to the System (GN) frequency being greater than the System
(MN) frequency.
Synchronization
df min -0.00Hz
Maximum permissible negative slip frequency differential for synchr. 0.00 to -0.49 Hz
This parameter defines the lower permissible frequency differential limit for syn-
chronization. Prior to the control issuing a breaker closure command, the monitored
frequency differential of the two systems must be greater than the value configured
here.
Negative slip refers to the System (GN) frequency being less than the System (MN)
frequency.
Synchronization
dV max = 00.0%
Maximum permissible voltage differential
0.1 to 15.0 %
A close command will not be issued until the measured differential voltage of the
two systems is less than the value configured here. An internal hysteresis of 12.5%
of the value configured will be applied to eliminate relay chatter. The percentage
configured here is a + or – value.
Synchronization
Max phase < 00
Maximum permissible phase angle
1 to 60°
The phase angle in synchronous networks must not exceed the value configured
here to be able to energize the closing relay. If the value configured here is between
55° and 60°, the closing relay will not energize until the phase angle falls below
55°, but it will remain energized until the phase angle exceeds the configured value
even if it is between 55° and 60°.
Synchronization
Time pulse>000ms
Minimum pulse time of the breaker close relay
50 to 250 ms
The duration of the breaker closure command is defined by this parameter. The
length of the pulse can be adjusted to the requirements of the individual breaker.
The configured value defines the minimum on time of the pulse.
Gen.circ.breaker
Pick-up t. 000ms
Breaker inherent delay
40 to 300 ms
All breakers have an inherent delay. This is the time from when the closure com-
mand is issued until the breaker contacts are closed. This parameter defines that
time. The control unit uses the time value configured here to determine when the
breaker closure command is issued independent of the frequency differential. This
permits the breaker contacts to close as close as possible to the synchronous point.
