Hitachi Relion 670 Series Commissioning Manual page 180

Section 11
Testing functionality by secondary injection
Picup Curr
ANSIEQUATION2434 V1 EN-US
Example (rated secondary current = 5A):
CT ratio
VT ratio
Pickup_Curr
VDepFact
VHighLimit
IBase
VBase
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*VBase; if
VDepMode = Step, the minimum measured phase-to-phase voltage is lower than VHighLimit/
100*VBase:
•
•
•
Second section of the characteristic only:
If VDepMode = Slope, the minimum measured phase-to-phase voltage is between 0.25*VBase and
VHighLimit/100*VBase:
•
•
•
Last section of the characteristic:
If VDepMode = either Slope or Step, the minimum measured phase-to-phase voltage is higher than
VHighLimit/100*VBase:
•
•
•
4. Inject the voltages that are related to the first part of the characteristic, and then slowly increase the
phase current IA from 0.0 A up to the value the function trips. The PICKUP and STOC signals must
be activated when the amplitude of the phase current IA 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 IA 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 trips when IA is slightly higher than: 0.5 A in the second section; 5A 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 = ANSI Def. Time.
Apply the voltages related to the last part of the characteristic and inject a current IA 200% higher
174
_ CT sec
IBase
× ×
100
CTprim
VA: Ampl = 10 / √3; Angle = 0°
VB: Ampl = 10 / √3; Angle = 240°
VC: Ampl = 100 / √3; Angle = 120°
VA: Ampl = 50 / √3; Angle = 0°
VB: Ampl = 50 / √3; Angle = 240°
VC: Ampl = 100 / √3; Angle = 120°
VA: Ampl = 105/ √3; Angle = 0°
VB: Ampl = 105/ √3; Angle = 240°
VC: Ampl = 105 / √3; Angle = 120°
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10 000/5A
10 kV/100 V
100%
25%
100%
10 000 A
10 kV
Line distance protection REL670
1MRK506371-UUS Rev. M
(Equation 91)
Commissioning manual