Phase sequence monitoring relay TCPM

temperatureDPCOthree-phase

• detects phase failure with regenerated voltage present • up to 6 PTC sensors in series • fixed asymmetry alarm >10% • no neutral connection required • adjustable reaction timer 0.1 - 10s • LED indicators for power supply, relay and reaction timer The TCP-M monitors phase sequence, phase failure and phaseasymmetry, and is used with PTC sensors to provide over temperatureprotection for motors and other equipment. When the phase sequence iscorrect, all phases are detected, and the resistance of the PTC sensors onthe input T1 - T2 is within the correct range, the output relay energises.At a loss of one phase (> Vn x 0.75 ), or the detection of an asymmetryimbalance >10%, or when the resistance of the PTC sensors exceeds thetriggering threshold (3100 Ohm) the reaction time starts. At the end of time the output relayde-energises. Time is adjustablebetween 0.1s and 10s and is used totime out short transients which wouldotherwise cause nuisance tripping.The relay energises again whenphase L1, L2 and L3 return to thecorrect range and the resistance ofthe sensors falls below the resetthreshold (1650 Ohms). The control relay will detect a phasefailure even with a regeneratedvoltage present on the failed phase(no detection on request).