ABB RED670 - Page 200

UHighLimit 100%
IBase 10 000 A
10 kV
A test for each section of the characteristic of the function VRPVOC may be
performed; that may be achieved by applying the following voltages:
First section of the characteristic:
If VDepMode = Slope, the minimum measured phase-to-phase voltage is
lower than 0,25*UBase; if VDepMode = Step, the minimum measured phase-
to-phase voltage is lower than UHighLimit/100*UBase:
•
UL1: Ampl = 10 / √3; Angle = 0°
•
UL2: Ampl = 10 / √3; Angle = 240°
• UL3: Ampl = 100 / √3; Angle = 120°
Second section of the characteristic only:
If VDepMode = Slope, the minimum measured phase-to-phase voltage is
between 0,25*UBase and UHighLimit/100*UBase:
• UL1: Ampl = 50 / √3; Angle = 0°
• UL2: Ampl = 50 / √3; Angle = 240°
• UL3: Ampl = 100 / √3; Angle = 120°
Last section of the characteristic:
If VDepMode = either Slope or Step, the minimum measured phase-to-phase
voltage is higher than UHighLimit/100*UBase:
• UL1: Ampl = 105/ √3; Angle = 0°
• UL2: Ampl = 105/ √3; Angle = 240°
• UL3: Ampl = 105 / √3; Angle = 120°
4. Inject the voltages that are related to the first part of the characteristic, and
then slowly increase the phase current IL1 from 0.0 A up to the value the
function operates. The START and STOC signals must be activated when the
amplitude of the phase current IL1 is slightly above 0.25 A on the secondary
side. The corresponding trip signals TROC and TRIP will be activated after
the pre-set time delay has expired.
5. Decrease the current IL1 slowly and note the reset value.
6. Repeat steps 4 and 5 applying voltages that are related to the second and the
last section of the characteristic; the function operates when IL1 is slightly
higher than: 0.5 A in the second section; 1A in the last section.
7. Connect the trip output contact to the input channel of the test set in order to
stop the injection and measure the trip time.
8. If definite time delay is used for the overcurrent step, set the setting
Characterist = IEC Def. Time. Apply the voltages related to the last part of
the characteristic and inject a current IL1 200% higher than the set operation
level, and check the definite time delay for trip (the signals TROC and TRIP
of the protection function VRPVOC are active in trip condition).
9. If inverse time delay is used for the overcurrent step, the parameter setting
Characterist shall be properly set; we can refer, for example, to the setting
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
194 Line differential protection RED670 2.2 IEC
Commissioning manual