Completing The Test; Under Impedance Protection For Generator Zgvpdis; Verifying The Settings - Hitachi RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
OperMode
231a
312a
321a
11.4.15.3

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.4.16

Under impedance protection for Generator ZGVPDIS

Prepare the IED for verification of settings.
Values of the logical signals for ZGVPDIS are available on the local HMI under Main menu /Tests /
Function status /Impedance /ZGVPDIS (21G, Z<) /1:ZGVPDIS:ZGVPDIS . The Signal Monitoring
in PCM600 shows the same signals that are available on the local HMI.
11.4.16.1

Verifying the settings

Distance protection zones
While measuring operating characteristics, keep the current constant. Keep the current as close as
possible to its rated value or lower, however make sure it is higher than 30% of the rated current.
If the measurement of the operating characteristics runs under constant voltage conditions, ensure
that the maximum continuous current in an IED does not exceed four times its rated value.
To verify the zone 1 mho characteristic, at least two points must be tested.
IEC11000312 V2 EN-US
Figure 45:
Where,
156
Fault type/Faulted phase current to the IED
L1L2N/IL1 L1L2N/IL2
No Trip Trip
Trip No Trip
No Trip Trip
X
P3
LineAngle
Z1Rev
P4
Proposed four test points for phase-to-phase fault
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L2L3N/IL2 L2L3N/IL3
Trip No Trip
No Trip Trip
No Trip Trip
P1
Z1Fwd
P2
R
IEC11000312-2-en.vsd
1MRK 504 165-UEN Rev. K
L3L1N/IL1 L3L1N/IL3
No Trip Trip
No Trip Trip
No Trip Trip
GUID-8BD66BC8-AAC3-41C4-B819-B159361688D2 v5
GUID-F882501B-6A03-4409-BF70-DE1CF09E5541 v3
GUID-202C5606-5F12-4C00-A12F-02A33EB571D9 v1
GUID-69610335-7C97-4134-8A47-05501AB5C620 v3
Transformer protection RET670
Commissioning manual