Mitsubishi Electric MELPRO-A Series Instruction Manual page 16

3. Operation characteristics test
①In the field test, it is necessary to check the wiring or directionality, so the voltage is applied from the primary
side (high-voltage side) of zero-sequence voltage detector. There are 2 ways to do this, either by combining the
devices to form a test circuit (refer to Fig. 2-5) or by using a commercially available relay tester shown in Fig.
2-6.
②When this test is carried out, be sure that the main circuit is turned OFF.
③When the rated power supply voltage is applied, the RUN display LED (green) lights up. This indicates that the relay
works properly.
④By turning the indicator select switch to "TEST" and pushing "TEST" button for 2 seconds or more, output contact
can be forced to operate (except for the case of LOCK setting).
4. Operation characteristic control point
Perform the test periodically according to the following test conditions and criteria.
Test item
I
I operation
0
Each setting
value
V operation
0
value
Phase
characteristics
Operating time
characteristics
[MDG+ZCT+ZVT combination]
setting V setting
0 0
Minimum
Minimum Each setting
Minimum Minimum
Minimum Minimum
Test condition
Time setting
Instantaneous
Instantaneous
Instantaneous
Instantaneous
0.2s
0.3s or more
16
Input
V = Setting×150%
0
at the max.
sensitivity angle
I = Setting×150%
0
at the max.
sensitivity angle
V = Setting×150%
0
I = Setting×1000%
0
V = Setting×150%
0
I = Setting×130%
0
Applied at the same
time at the max.
sensitivity angle
Criteria
±10% of setting
value
±25% of setting
value
Max. sensitivity
angle = 45°setting
Lag: 25～65°
Lead: 115～155°
Max. sensitivity
angle = 10°setting
Lag: 50～85°
Lead: 90～130°
50～100ms
0.1～0.3s
±20% of setting
time
JEP0-IL9554