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1 Phase Current
2 Phase Current
No 50/51-n Opera-
tion
50/51-n Operation
67G/67GS/67N Directional Earth Fault
Calculated Earth Fault
,
Measured Earth Fault
and
Sensitive Earth Fault
elements can be
set as directional. These are polarized from residual voltage, calculated from the 3 phase voltage inputs or the
3V0 input depending on the VT1/2/3
Config
setting in the CT/VT menu.
The relay
Char Angle
setting is the characteristic phase angle of the fault impedance i.e. the phase angle of
the fault current with respect to the voltage driving the current. The earth fault functions are polarized from
the residual voltage which is in anti-phase with the fault voltage for a single-phase to earth fault. Care is
required when testing by secondary injection with regard to current and voltage polarity.
To simulate an earth fault on a relay with 3 phase-phase or 3 phase-neutral connected voltage inputs, defined
by the VT1/2/3
Config
setting of Van,Vbn,Vcn or Va,Vb,Vc, proceed as follows. Balanced 3P voltage should
first be applied, then the phase-neutral voltage magnitude on the faulted phase should be reduced in magni-
tude with no change in phase angle to produce V
res
and simulate the fault. The fault current, on the faulted
phase only, should be set at the MTA with respect to the phase-neutral voltage on the faulted phase, e.g. for a
relay setting of -15°, set the phase current to lag the ph-n voltage by 15°.
Alternatively, a single phase voltage source can be used in the above test. The polarity of this voltage, applied
to the faulted phase-neutral alone, must be reversed to produce the same residual voltage (V
res
) phase direc-
tion as that produced by the 3P voltage simulation described above.
For the
Phase Voltage Config
of Vab, Vbc, Vo, the single phase voltage applied to the Vo input is used as
the polarizing quantity. The inversion is once again required since this input is designed to measure the
residual voltage directly, as produced by an ‘open delta VT’ arrangement. The current must be set at the MTA
with respect to the inversion of this voltage. e.g. for a relay setting of -15°, the phase current must lag the (Vo
+ 180°) voltage by 15°, i.e. if Vo is set at 180°, set I
ph
at -15°.
If the pickup of one directional
Earth Fault
element is mapped to an LED, this can be used to check direc-
tional boundaries for pickup and drop-off as the current phase angle is increased and decreased. Note that the
Calculated Earth Fault
,
Measured Earth Fault
and
Sensitive Earth Fault
have separate
directional settings and must be tested individually.
[dw_7SR5_function67G/67GS/67NFunctionalTests, 1, en_US]
Figure 9-11
Directional Earth Fault Boundary System Angles
9.10.20
Functional Tests
9.10 Protection Functional Tests
Reyrolle 7SR5, Transformer Protection Device, Device Manual
445
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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