SOTF

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SWITCH ON TO FAULT (SOTF) FEATURE:

Settings Of Switch On To Fault (SOTF):

ESOTF = Y

ENCLO = Y

CLOEND = 10.00

EN52A = N

52AEND = 10.00

SOTFD = 500 (This setting for testing should be kept some higher value,

after testing of SOTF function it should be kept as original value) 50H = 1.20

Z2PD = 2000

Z3PD = 2000

Z4PD = 2000

Z2GD = 2000

Z3GD = 2000

Z4GD = 2000

(Keep the Zone time delays {Z2PD to Z4GD} at maximum value for testing of

SOTF function, after testing of SOTF feature change these settings to original

gvalue)

MTO = M2P + Z2G + 50H

Step 1 Click “OMICRON Test Universe

1.51” Icon in desktop.

“OMICRON start page” window

opens.

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Step 2 Click “Distance…” in “OMICRON

start page”.

“OMICRON Distance –{Test

View: Distance1” window opens.

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Step 3 “OMICRON Distance” window

select ‘Parameters > Test Object…’

‘Parameters For Protection

Device’ menu window opens.

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Step 4 In ‘Parameters For Protection

Device’ menu window enter the

parameters in ‘Device Settings’,

‘System Settings’.

This will configure the settings

essential for testing.

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Procedure For Creating MHO Characteristics Zones:

Step 5 In ‘Parameters For Protection

Device’ > ’Zone Setting’ menu

Click ‘New’ button New Zone will be added

Click ‘Edit ‘ button ‘Characteristic Editor’ window

opens.

In ‘Characteristic Editor >

‘Predefined Shapes’ menu click

‘Circle’ button

It will add mho characteristics

Enter impedance reach value, offset

and line angle values in the ‘Element

list’ window then press ‘OK’ button

Adopt the settings corresponding

to zone 2 for testing the SOTF

function. The same procedure

can be followed for including

any number of Mho

characteristics for testing.

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Step 6 In ‘Parameters For Protection

Device’ menu window enter the

parameters in ‘Test Settings’,

This will configure the settings

essential for testing.

Step 7 In “OMICRON Distance –{Test

View: Distance1” window select

‘Parameters > Hardware

Configuration…’

“Hardware Configuration” menu

window opens.

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Step 8 In “Hardware Configuration” menu

Click “General > Test Set(s) >

Details”.

“Output Configuration Details”

menu window opens.

Step 9 Select 3 Voltage and 3 current

sources & Click “OK”.

“Output Configuration Details”

menu window closes.

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Step 10 In “Hardware Configuration” menu Click

“Analog Outputs” select the voltage and

current sources.

-

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Step 11 In “Hardware Configuration” menu Click

“Binary / Analog Inputs” and in “Binary

Outputs” select none of the inputs / outputs.

-

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Step 12 In “OMICRON Distance –{Test View:

Distance1” window select ‘Vie

w > Test’.

“Test View” Menu

opens.

Step 13 In “OMICRON Distance –{Test

View: Distance2” window ‘Fault

type’ menu select

‘R-Y-B’ fault.

Fault type cab be selected according to

the element being tested in the MTO

equation.

Step 14 In “OMICRON Distance –{Test

View: Distance2” window ‘Shot’

menu enter the Test point

impedances at line angle to be tested

and click ‘Add’ button for testing

test points.

Enter the test point zone reaches

corresponding to element, which is

being tested in MTO equation and

keep the corresponding zone element

time delay at maximum value in the

SEL 321 relay.

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Step 15 In “OMICRON Distance –{Test View: Distance2”

window ‘Settings’ menu enter the parameters for

testing.

-

Step 16 Apply rated DC input to the status input,

which has been assigned to breaker-closing

input.

As soon as the DC input

applied to the status input

which has been assigned

to breaker closing input,

the fault should be

applied to create the

SOTF condition with in

SOTFD set time delay in

the relay.

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Step 17 In “OMICRON Distance –{Test View: Distance2”

window click and select ‘Start single Test’ button.

Fault impedance

selected will be

applied to relay.