Larsen & Toubro U-POWER Omega UW-MTX 1.5G, User Manual

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6-8
Note: Refer UW-MTX Release manual for the programming of further protections in detail.
3. Protection....
continued
Earth Fault :When fault current flows from phase to earth due to rupturing of insulation,
this can lead to arc flash events and electric shock. This causes more damage to
the distribution system. This feature provides protection against earth fault current.
Neutral Overload :This provides protection against neutral overload at 50%, 100% & 200% of rated
current. It follows overload characteristics.
Restricted EF :It works in the restricted zone of source side. It functions similar to normal earth
fault protection
Earth Leakage :Earth leakage current is harmful to human body. Sensing of fault current & communicating
occurrence of fault signal to the main release is being done by an earth leakage module.
Under current :Decrease in any phase current below threshold leads to under current.
Current Unbalance :It provides protection against any unbalance in phase currents .
Settings: Overload configuration:
Similarly set all protection parameters .
Overload
Protection
O/L Char
Pick-up (Ir) : Enable
2
: I T
: 1In
Overload
Protection
O/L Char
Pick-up (Ir) : Enable
2
: I T
: 1In
Overload
Delay (tr)
Pre-alarm
Thm-mem : 2s
: 0.80Ir
: On
Enable O/L protection Select O/L char. from the
drop down list.
Select delay from drop down list
Save Settings ?
Yes No
After programming the settings, press key to escape from menu and
confirm the changes in Save Settings. After doing all the settings Save the
Set Group by pressing the escape key . Save in Progress” message
“
confirms the Set Group has saved.
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