Test Of Frequency Difference; Test Of Reference Voltage; Test Of Energizing Check; Test Of Dead Line Live Bus (Dllb) - ABB REC 561 User Manual

ABB Network Partner AB
Version 1.0-00
4.2.3 Test of frequency
difference
4.2.4 Test of reference
voltage
4.3 Test of energizing
check
4.3.1 Test of dead line live
bus (DLLB)
Synchronism and energizing
check for double circuit breakers
and voltage selection
The frequency difference is set at 50 mHz on the MMI, and the test
should verify that operation is achieved when the FreqDiff frequency dif-
ference is lower than 50 mHz.
1 Use the same MMI setting as under "Test of phase difference".
2 Test with FreqDiff = 0 mHz
Apply voltages U-Line (UL1) equal to 100% U
equal to 100% U /sqr3, with a frequency difference equal to 0 mHz
r
and a phase difference lower than 45°. Check that the SYN1-
AUTOOK and SYN1-MANOK outputs are activated.
3 Test with FreqDiff = 1Hz
Apply voltage to the U-line (UL1) equal to 100% U
quency equal to 50 Hz and voltage U-bus (U5) equal to 100% U
with a frequency equal to 49 Hz.
Check that the two outputs are not activated.
4 The test can be repeated with different frequency values to verify that
the function operates for values lower than the set ones. If the FREJA
program, Test of synchronising relay, is used the frequency can be
changed continuously.
But note that a frequency difference also implies a floating mutual-
phase difference. So the SYN1-AUTOOK and SYN1-MANOK out-
puts might not be stable, even though the frequency difference is within
set limits, because the phase difference is not stable!
1 Use the same basic test connection as in Fig. 8. The UDiff between the
voltage connected to U-bus and U-line should be 0%, so that the
SYN1-AUTOOK and SYN1-MANOK outputs are activated first.
Change the U-Line voltage connection to UL2 without changeing the
seting on the MMI
Check that the two outputs are not activated.
2 The test can also be repeated by moving the U-line to the UL3 input.
Use these voltage inputs:
U-line = UL1, UL2 or UL3 voltage input on the terminal.
U-bus = U5 voltage input on the terminal.
The test should verify that the energizing function operates for a low volt-
age on the U-Line and for a high voltage on the U-bus. This corresponds
to an energizing of a dead line to a live bus.
Use these MMI settings during the test if the final setting is not deter-
mined.
1MRK 580 167-XEN
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/sqr3 and U-Bus (U5)
r
/sqr3 with a fre-
r
/sqr3,
r