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6.5.1.2
Earth fault element EF1 to EF4 and SEF1 to SEF4
The earth fault element is checked on the operating current value and operating time for IDMT
curve.
Operating current check
The testing circuit is shown in Figure 6.5.3.
+
Single-phase
current
−
source
+
power
−
supply
Figure 6.5.3 Test Circuit for EF and SEF Elements
The output signal of testing element is assigned a configurable LED.
The output signal numbers of the elements are as follows:
Element
EF1
EF2
EF3
EF4
• Enter the signal number to observe the operation at the LED as shown in Section 6.5.1 and
press the ENTER key.
• Apply a test current and change the magnitude of the current applied and measure the value
at which the element operates.
Check that the measured value is within 5% of the setting value.
A
Signal No.
Element
63
SEF1
64
SEF2
65
SEF3
66
SEF4
168
GRE110
TB 1
- 5
- 6
- 7
- 8
TB 1 - 13
- 14
-12
Signal No.
67
68
69
70
6 F 2 T 0 1 7 2
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- Inverse Time Overcurrent Protection
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