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4.
Function test
4.1 Phase current differential element DIF test
(1) Minimum operating value test
Tap setting
(2) Percentage restraining characteristic test
Tap setting
4.2 Inverse definite minimum time overcurrent element (IDMT) OC, EF and SEF test
Element
OC
EF
SEF
4.3 Thermal overload element test
Element
THM-A
THM-T
4.4 CBF and UC element test
Element
CBF
UC
I
Measured current
Measured current (I 2 )
I
× Tap
× Tap
20 × Tap
Test current
Measured operating time
1.2 × I s
20 × I s
1.2 × I s
20 × I s
1.2 × I s
20 × I s
Test current
Measured operating time
1.2 × I s
10 × I s
Tap setting
⎯ 225 ⎯
I
Measured current
6 F 2 S 0 8 2 8
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