ABB Relion 670 Series Commissioning Manual page 121

1MRK 511 403-UEN Rev. K
•
•
•
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:
•
•
•
Last section of the characteristic:
If VDepMode = either Slope or Step, the minimum measured phase-to-phase voltage is higher
than UHighLimit/100*UBase:
•
•
•
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 IEC Very inv.; If the IEC Very inverse
time characteristic is selected, the trip signals TROC and TRIP will operate after a time defined
by the equation:
[ ]
t s
IECEQUATION2435 V1 EN-US
where:
t
I
StartCurr Set operate value
This means that if the measured phase current jumps from 0 to 2 times the set operate level
and time multiplier k is set to 1.0 s (default value), then the TROC and TRIP signals will operate
after a time delay equal to 13.5 s ± tolerance.
Taking into account the above explanation, inject 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
trip time delay.
Bay control REC670
Commissioning manual
UL1: Ampl = 10 / √3; Angle = 0°
UL2: Ampl = 10 / √3; Angle = 240°
UL3: Ampl = 100 / √3; Angle = 120°
UL1: Ampl = 50 / √3; Angle = 0°
UL2: Ampl = 50 / √3; Angle = 240°
UL3: Ampl = 100 / √3; Angle = 120°
UL1: Ampl = 105/ √3; Angle = 0°
UL2: Ampl = 105/ √3; Angle = 240°
UL3: Ampl = 105 / √3; Angle = 120°
13 5 . * k
=
 
I
 −
 1
 
StartCurr
Operate time in seconds
Measured value (for example, phase current)
If tDef_OC is set to a value different from 0 s, then this time delay is added to
the one that is defined by the IDMT characteristic.
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Section 11
Testing functionality by secondary injection
(Equation 18)
115