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ABB RET670 Installation And Commissioning Manual

ABB RET670
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13.10.2.3 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.
3 U
0
× U
L1
U
L2
U
L3
+ +=
IEC00000276 V1 EN (Equation 16)
Where:
U
L1
, U
L2
and U
L3
IEC00000275 V1 EN
= the measured phase voltages.
4. Compare the result with the set value (consider that the set value 3U0> is in
percentage of the base voltage of the zero-sequence operating voltage.
13.10.2.4
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.
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. Connect the nominal dc voltage to the CBCLOSED binary input.
3. Change the voltages and currents in all three phases simultaneously.
The voltage change should be greater then set DU> and the current change
should be less than the set DI<.
The BLKU and BLKZ signals appear without any time delay. The
BLKZ signal will be activated, only if the internal deadline detection is
not activated at the same time.
3PH should appear after 5 seconds, if the remaining voltage levels are
lower than the set UDLD< of the DLD function.
4. Apply normal conditions as in step
3.
The BLKU, BLKZ and 3PH signals should reset, if activated, see step 1.
5.
Change the voltages and currents in all three phases simultaneously.
1MRK 504 088-UEN C Section 13
Verifying settings by secondary injection
173
Installation and commissioning manual

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ABB RET670 Specifications

General IconGeneral
Rated Frequency50/60 Hz
InputsAnalog and binary inputs
ApplicationProtection of power systems
Communication ProtocolsIEC 61850, DNP3, Modbus
Operating Temperature Range-25°C to +55°C
MountingRack mounted
Number of Binary InputsUp to 48
Number of Binary Outputs32
Protection FunctionsOvercurrent Protection
OutputsBinary outputs
EnclosureIP 54
TypeLine Differential Protection
Number of Analog Inputs24

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