SYCON-7800

Protection Relay

The earth fault is sensed by measuring the neutral current. Normally in the three-phase system the vector sum of three-phase current is zero hence no current flows from neutral to earth. If a ground fault occurs the vector sum is not zero. If we can sense the current from neutral to earth we will get the residual current which we can say as earth fault current. Sensing this current calibrated we can compare with the set point to detect the earth’s fault.

Order code	Current Range	Tripping Time
SYCON 7721	30 mA to 300 mA	0.15 Sec To 3 Sec
SYCON 7722	300 mA to 3 A	0.15 Sec To 3 Sec
SYCON 7723	1 A to 8 A	0.15 Sec To 3 Sec

Solid-state
Wide operating current range.
Low power consumption
Variable current and time setting
Ideal for compliance to I E rule 61-A.

Healthy & Fault Indication

Site settable Current & Time
Reset Facility
Test Mode Facility

Input Auxiliary Supply	230 VAC (110 VAC & 415 VAC optional)
Current Sensitivity	Variable from 10 % to 80 % ,settable with DIP switches in three different models
Trip Time	From 0.15 Seconds to 3.00 seconds settable with DIP switches
Relay Contacts	Potential free NO-C-NC, 10Amps at 250 VAC contacts
Trip Indication	LED