Mitsubishi Electric MELPRO-A Series Instruction Manual page 14

3. Operation characteristics test
①In the field test, please apply I
On the other hand, please apply V
The example of test circuit is shown in Fig. 7-4.
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
From ②
From ①
20Ω
R
SW
AC100
/110V
P1 P2 P1, P2 terminal of MDG relay
[MDG+ZCT combination]
current from the primary side of ZCT (or test terminal: kt, ℓt).
0
voltage to the input terminal of the relay directly.
0
setting V setting
0 0
Minimum
Minimum Each setting
Minimum Minimum
Minimum Minimum
CB
ZCT
"MZT" K
Phase
meter
L
－ －
φ
＋ ＋
0~1000Ω
A
～
R
1 2
Voltage regulator
Fig. 7-4 Example of test circuit
Test condition
Time setting
Instantaneous
Instantaneous
Instantaneous
Instantaneous
0.2s
0.3s or more
Tripping coil
52a a11
kt
+
Z1
k
"MDG-A4V"
Z2
ℓ
ℓt
a
190V
V
0~50V
～
14
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
AC100V
O
Earthed Voltage Transformer
or
DC100V
a12
P1
AC100/110V
P2
f
+
Disconnect
To ①
Note) This figure shows the connection of
V = 190V.
0
In the case of V
To ②
connection from
Criteria
±10% of setting
value
±10% of setting
value
Lag: 35～55°
Lead: 125～145°
50～100ms
0.1～0.3s
±20% of setting
time
U V W
(EVT)
a f
= 110V, change the
0
a
a
to .
190V
110V
JEP0-IL9559