Measuring The Operating Time Of Distance Protection Zones; Phase Selection, Quadrilateral Characteristic With Settable Angle Frpspdis (21) - ABB RET670 Commissioning Manual
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- Applications manual (1016 pages) ,
- Commissioning manual (318 pages) ,
- Installation and commissioning manual (240 pages)
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Section 11
Testing functionality by secondary injection
11.4.5.2
11.4.6
128
Observe that the zones that are not tested have to be blocked and the zone that is
tested has to be released.
4.
Repeat steps 1 to 3 above to find the operating value for the phase-to-ground fault
L3-G according to figure
Test points 8, 9, 10 and 11 are intended to test the directional lines of
impedance protection. Since directionality is a common function for
all 5 measuring zones, it is only necessary to test points 8, 9, 10 and
11 once, in the forward direction in order to test the accuracy of
directionality (directional angles). Directional functionality testing
(trip inside, no-trip outside) should always be made for all
impedance zones set with directionality (forward or reverse).
Measuring the operating time of distance protection zones
Procedure:
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition to find the operating time for the phase-to-phase fault
according to test point 10 in figure
the measurement with the setting tPP.
3.
Repeat steps
1
to
2
to find the operating time for the phase-to-ground fault according
to test point 10 in figure
the setting tPG.
4.
Repeat steps
1
to
2
Observe that the zones that are not tested have to be blocked and the zone that is
tested has to be released.
Phase selection, quadrilateral characteristic with settable angle
FRPSPDIS (21)
Prepare the IED for verification of settings as outlined in section
this chapter.
The phase selectors operate on the same measuring principles as the impedance measuring
zones. So it is necessary to follow the same principles as for distance protection, when
performing the secondary injection tests.
Measure operating characteristics during constant current conditions. Keep the measured
current as close as possible to the rated value of its associated input transformer, or lower.
But ensure that it is higher than 30% of the rated current.
30
and table 25.
29
and table
30
and table 25. Compare the result of the measurement with
to find the operating time for all other used measuring zones.
1MRK 504 165-UUS -
24
for zone 1. Compare the result of
"Preparing for test"
Transformer protection RET670 2.2 ANSI
Commissioning manual
in
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