Mikro N202 User Manual

O O O No auxiliary power supply.

On O O System normal mode. No tripping.

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

a

b

c

a - Low-set start/trip status indicator

2. Light Indicators

The light indicators display the status of the system.

b - High-set start/trip status indicator

c - Auxiliary power supply indicator

h

f

d - Test button

e - Trip reset button

f - Earth-fault low-set adjustment

g

g - Delay time adjustment

h - Earth-fault high-set adjustment

d

e

f

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

Indicator

AUX I> I>>

Status

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.

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.

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 .

IDMT Normal Inverse Curve

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.

5. Electrical Specication

Aux

7. Connection Diagram

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

COMNO NC

1

R1

7 8 9 10

L1

L2

L3

N

8. Case Dimensions

72 mm

COM NC NO

62 3 4 5

R2

12

11

N

N 202

L

DANGER

!

97 mm
89 mm

LOAD

68.0 ± 0.5 mm

6. Mechanical

Mounting.................................................. Panel mounting

Front panel............................................... 72x72 mm

Approximate weight............................. 0.6 kg

Side

Front

72 mm

68.0 ± 0.5 mm