hi I am diwakar I would like to get details on function of single phasing precentor Wikipedia

Single Phase Preventer



Protection of induction motors against single phasing or reverse phasing or unbalance supply is one of the major problems in electrical systems. For safe running of 3-phase motors, special protections that keep a continuous watch on supply conditions are very essentials. The major cause of maxium motors burn-out is overloading which occurs due to unbalance supply or single phasing. Phase failure occurs in case of fuse blown-off, loose connections or loss of phase from supply itself.

'PROTONs MULTIFUNCTION RELAY - SPP 1' offer these protections along with LOW/HIGH voltage tripping to ensure the trouble free running of 3-phase motors.
Single Phase Preventer



SALIENT FEATURES :
•
Operates on the principle of sensing negative sequence components of the system.
•
Suitable for the protections of motors of any H.P.
•
Protection against single phasing, reverse phasing, unbalance supply.
•
No separate auxiliary supply required.
•
Individual trip indication for SPP, reverse phasing and indication for output relay ON.
•
Auto reset type voltage hysterisis gap for tripping on under/over voltage.

TECHNICAL SPECIFICATION :
System Supply
: 415 VAC, Three phase +/- 10%
Output Contacts
: One changeover ( C-NO-NC)
Output contact rating
: 5 Amps at 230 V AC.
Trip Time delay
: 2-3 seconds.
Reset Mode
: Auto reset.
Trip Indications
: For SPP, reverse phasing and relay ON indication.
Unbalance trip setting
: Fixed at 40 Volts between any two phases.
Temperature range
: -5 0C to 60 0C.
Relative humidity
: 95% R.H.
Mounting
: Din rail.
: Base mounting dimensions 55 (W) x 65 (L) x 125 (D) mm.
Auxiliary Supply
: 24 V DC, +/- 10% (optional feature)
* Due to continuous change, specifications are subject to change without notice.

APPLICATION :
Electrical Panels.
Compressor motors.
Electrical Test benches.
Submersible pumps.
Genset panels.
Cold storages.