Mikro N202-240AD User manual

TECHNICAL DATA
1. Current and Time Adjustments
Earth-fault Low-set Current (I>) Adjustment
- This adjustment is for setting the minumum earth-fault
current for tripping with time delay.
- The setting range is between 0.1A to 2A
Earth-fault High-set Current (I>>) Adjustment
- This adjustment is for setting the instantaneous tripping
current due to an earth-fault.
- The setting range is between 1x to 10x of the earth-fault
low-set setting value.
I>> = a x I> (a= 1 to 10)
- This high-set feature can be disabled by setting the
tripping current to innity (∞).
Time Delay (TM) Adjustment
- The time multiplier is for setting the normal inverse
time/ current characteristic (IDMT) as according to
BS142.
- The setting range between 0.05 to 1.0 .
2. Light Indicators
The light indicators display the status of the system.
AUX I> I>>
O O O No auxiliary power supply.
On O O System normal mode. No tripping.
On Blink O Earth-fault low-set start.
On On O Earth-fault low-set tripped.
On O Blink Earth-fault high-set start.
On O On Earth-fault high-set tripped.
Indicator Status
3. Push Buttons
Reset Button
- The reset button is for resetting the light indicators (I> or I>>) after an earth-fault tripping
has occured.
- To reset, press the reset button once.
Test Button
- Test button is for checking the relay operation.
- Push and hold the test button, I> and I>> LEDs start blinking then LEDs turn On and relay
contacts will be activated after 3s.
4. Trip Contacts
There are two set of tripping contacts namely, R1 and R2.
R1,R2 - Manual Reset Type
- These contacts is activated during an earth-fault trip. The contacts remain activeted
regardless of the removal of fault current. This relay can only be reset by pressing the
“RESET” button.
N202 IDMT Earth-Fault Relay User’s Guide
AUXI>>I>
TEST RESET
I
0.1A
0.5A
2A
1.5A
1A
TM
0.05
0.1
0.2
0.3
0.4 0.5 0.6
0.7
0.8
0.9
1.0
I
X1
X2
X4
X6
X8
X10
IDMT EARTH FAULT RELAY
N202
abc
def
f
g
h
a - Low-set start/trip status indicator
b - High-set start/trip status indicator
c - Auxiliary power supply indicator
d - Test button
e - Trip reset button
f - Earth-fault low-set adjustment
g - Delay time adjustment
h - Earth-fault high-set adjustment
IDMT Normal Inverse Curve

5. Electrical Specication
Auxiliary Supply
N202-240AD............................................ 85 ~ 265 VAC or 110 ~ 370 VDC
Supply frequency.................................. 50Hz or 60Hz
VA rating................................................... 3 VA typical
Trip Contact
Rated Voltage......................................... 250 VAC
Continuous carry................................... 5A (cos = 1.0)
Expected electrical life........................100,000 operations
Expected mechanical life................... 5 million operations
Setting Ranges
Low-set (I>)..............................................0.1A to 2.0A (2% to 40%)
Low-set delay time (TM).....................0.05 to 1.0
High-set (I>>)......................................... I> to 10x I> or disable
High-set delay time (t>>).................. Instantaneous
Indicators
Auxiliary supply..................................... Green LED indicator
Pick-up...................................................... Red LED indicator
Trip............................................................. Red LED indicator
6. Mechanical
Mounting.................................................. Panel mounting
Front panel............................................... 72x72 mm
Approximate weight............................. 0.6 kg
Aux
62345
L
R1
N
7 8 9 10 11 12
COMNO NC
1
N 202
L1
L2
L3
N
LOAD
R2
COM NC NO
7. Connection Diagram
8. Case Dimensions
72 mm
Front
72 mm
97 mm
89 mm
Side
68.0 ± 0.5 mm
68.0 ± 0.5 mm
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DANGER