ABB REL650 series, Commissioning Manual

Page: 139 / 208

9.7.2.3 Measuring the operate value for the zero-sequence function
M1405-72 v11
Measure the operate value for the zero-sequence function, if included in the IED.
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):
3 U
0
×
U
L1
U
L2
U
L3
+ + =
IEC00000276 V1 EN-US
(Equation 94)
Where:
U
L1
, U
L2
and U
L3
IEC00000275 V1 EN-US
are the measured phase voltages
4. Compare the result with the set value of the zero-sequence operating voltage
(consider that the set value
3U0> is in percentage of the base voltage.)
5. Repeat steps 1 and 2 . Then slowly increase the measured current in one phase
until the BLKU signal disappears.
6. Record the measured current and calculate the corresponding zero-sequence
current according to the equation (observe that the currents in the equation are
phasors):
0 L1 L2 L3
3 = I I I I
× + +
IECEQUATION00019 V1 EN-US
(Equation 95)
Where:
1 2 3 L L L
I I and I
,
IECEQUATION00020 V1 EN-US
are the measured phase currents
7. Compare the result with the set value of the zero-sequence operate current.
Consider that the set value
3I0< is in percentage of the base current IBase .
9.7.2.4 Measuring the operate value for the dead line detection function
GUID-4ABF1FD4-F6D3-4109-AFE5-552875E558A0 v4
1. Apply three-phase voltages with their rated value and zero currents.
2. Decrease the measured voltage in one phase until the DLD1PH signal
appears.
3. This is the point at which the dead line condition is detected. Check the value
of the decreased voltage with the set value UDLD< (UDLD< is in percentage
of the base voltage
UBase ).
1MRK 506 383-UEN A
Section 9
Testing functionality by secondary injection
Line distance protection REL650 2.2 IEC 133
Commissioning manual