Measuring The Operate Value For The Dead Line Detection Function; Checking The Operation Of The Du/Dt And Di/Dt Based Function - ABB rec670 Commissioning Manual
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Also See for rec670:
- Applications manual (658 pages) ,
- Product manual (139 pages) ,
- Operator's manual (116 pages)
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Section 10
Testing functionality by secondary injection
10.8.2.4
10.8.2.5
138
×
3 U
=
U
+
U
0
L1
L2
IEC00000276 V1 EN
Where:
U
, U
and U
L1
L2
L3
IEC00000275 V1 EN
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):
×
+
+
3
I
=
I
I
0
L1
L2
IECEQUATION00019 V1 EN
Where:
,
I
I and I
L
1
L
2
L
3
IECEQUATION00020 V1 EN
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.
Measuring the operate value for the dead line detection function
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).
4.
Apply three-phase currents with their rated value and zero voltages.
5.
Decrease the measured current in one phase until the DLD1PH signal appears.
6.
This is the point at which the dead line condition is detected. Check the value of
the decreased current with the set value IDLD< (IDLD< is in percentage of the
base current IBase).
Checking the operation of the du/dt and di/dt based function
Check the operation of the du/dt and di/dt based function if included in the IED.
+
U
L3
I
L3
are the measured phase currents
1MRK 511 360-UEN A
(Equation 32)
are the measured phase voltages
(Equation 34)
Bay control REC670 2.1 IEC
Commissioning manual
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