Measuring The Operate Value For The Zero Sequence Function - ABB Relion 650 Series Commissioning Manual

1MRK 511 209-UEN -
5.6.2.3
REC650
Commissioning Manual
Procedure
1. Simulate normal operating conditions with the three-phase currents in phase
with their corresponding phase voltages and with all of them equal to their
rated values.
2. Slowly decrease the measured voltage in one phase until the BLKU signal
appears.
3. Record the measured voltage and calculate the corresponding negative-
sequence voltage according to the equation.
Observe that the voltages in the equation are phasors:
2
× ×
3 U = U + a
2 L 1
EQUATION707 V1 EN
Where:
U U
L1 L2
EQUATION708 V1 EN
2 p ×
j ---------- -
3
×
a = 1 e = –
EQUATION709 V1 EN
4. Compare the result with the set value (consider that the set value 3U2> is in
percentage of the base voltage UBase) of the negative-sequence operating
voltage.

Measuring the operate value for the zero sequence function

Measure the operate value for the zero sequence function, if included in the IED.
Procedure:
1. Simulate normal operating conditions with the three phase currents in phase
with their corresponding phase voltages and with all of them equal to their
rated values.
2. Slowly decrease the measured voltage in one phase until the BLKU signal
appears.
3. Record the measured voltage and calculate the corresponding zero sequence
voltage according to the equation.
Observe that the voltages in the equation are phasors.
×
U + a U
L 2 L3
and U
L3
3
,
------ -
0 5 + j
2
Section 5
Testing functionality
(Equation 13)
= the measured phase voltages
67