258
6
F
2
S
0
8
3
4
Figure 6.5.1.3 Testing DOCN Element
6.5.1.6 Inverse Definite Minimum Time Overcurrent Element (IDMT) OCI, EFI
The testing circuit is shown in Figure 6.5.1.4.
Single-phase
current
source
A
TB1
-2
-1
-7
-8
Ia
3Io
GRZ100
Monitoring
jack
A
0V
Time
counter
TB4 -A16
-A17
E
DC
power
supply
+
−
Start
Stop
OV
Figure 6.5.1.4 Testing IDMT
One of the four inverse time characteristics can be set, and the output signal numbers of the IDMT
are as follows:
Element Signal
number
OCI-A 97
OCI-B 98
OCI-C 99
EFI 61
Fix the time characteristic to test by setting the scheme switch MEFI or MOCI on the "Scheme
switch" screen.
"Setting (change)" sub-menu
→
"Protection" screen
→
"Trip" screen
→
"Scheme switch" screen
The test procedure is as follows:
•
Press 5 (= Logic circuit) on the "Test" screen to display the "Logic circuit" screen.
•
Enter a signal number to observe the OCI or EFI output at monitoring jack A and press the
ENTER key.
•
Apply a test current and measure the operating time. The magnitude of the test current should
be between 1.2
×
Is to 20
×
Is, where Is is the current setting.
•
Calculate the theoretical operating time using the characteristic equations shown in Section
2.6.4. Check that the measured operating time is within IEC 60255-3 class 5 for standard, very
and long-time inverse or IEC 60255-3 class 7.5 for extremely inverse.
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