Hitachi RET670 User Manual

Test point Reach Value Comments
7 X 0
R RLdFw
set
8 X –0.1072 x RLdFw
set
Exact: 0.4 x RFPE x tan (ArgDir=20°)
R 0.4 x RLdFw
set
9 X –0.8 x RLdFw
set
x tan(ArgDir=20°)
R 0.8 x RLdFw
set
10 X 0.17 x (2 x X1
set
+ X0
set
) Exact: 0.5 x (2 x X1
set
X0
set
)/3
R -0.36 x (2 x X1
set
+ X0
set
) Exact: 0.5 x (2X1
set
+ X0
set
)/(3 x tan(AgNegDir=30°)
11 X 0.27 x (2 x X1
set
+X0
set
) Exact: 0.8 x (2 x X1
set
+ X0
set
)/3
R –0.57 x (2 x X1
set
+ X0
set
) Exact: 0.8 x (2X1set + X0set)/(3 x
tan(AgNegDir=30°)
12 X 0.5 x (2 x X1
set
+ X0
set
)/3
R 0.5 x (2 x R1
set
+ R0
set
)/3
13 X 0 Only used when RLdFw > RFPE
R RFPE
11.4.1.1 Measuring the operating limit of set values
M14944-126 v8
Procedure:
1. Subject the IED to healthy normal load conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the measured impedance to find the operating
value of the phase-to-phase fault for zone 1 according to test point 1 in figure
25 and table 20.
Compare the result of the measurement with the set value.
3. Repeat steps 1 to 2 to find the operating value for test points 2, 3 in table
20.
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 to find the operating value for the phase-to-earth fault L3–E according to
figure
26 and table 21.
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).
11.4.1.2 Measuring the operating time of distance protection zones
M14944-154 v6
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 12 in figure
25 and table 20 for zone 1. Compare the result of the measurement with the
setting t1PP.
3. Repeat steps 1 to 2 to find the operating time for the phase-to-earth fault according to test point
12 in figure
26 and table 21. Compare the result of the measurement with the setting t1PE.
4. Repeat steps 1 to 3 to find the operating time for all other used measuring zones.
1MRK 504 165-UEN Rev. K Section 11
Testing functionality by secondary injection
Transformer protection RET670 105
Commissioning manual
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Hitachi RET670 Specifications

General

Brand	Hitachi
Model	RET670
Category	Control Systems
Language	English