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4. Function test
4.1 Percentage current differential element DIF test
(1) Minimum operating value test
Tap setting Measured current
(2) Percentage restraining characteristic test
Tap setting
I
1
Measured current (I
2
)
× I
k
× I
k
(3) Operating time test
Tap setting Test current Measured time
4.2 2F-lock element check
4.3 5F-lock element check
4.4 High-set overcurrent element HOC test
(1) Minimum operating value test
Tap setting Measured current
(2) Operating time test
Tap setting Test current Measured time
4.5 Restricted earth fault element REF test
Tap setting
I
a
Measured current (I
n
)
× I
k
× I
k