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such things as a downed power line , the utility company ’s primary transformer fuse or cutout being open , an open connection , a bad termination , an open splice , a broken conductor(passive) can be caused bySingle phasing
when one of the three back - up fuses blows or if one of the contactor contacts is open - circuited(passive) is usually causedSingle - phasing
between 155 and 5,000 gpm " SMART " Motor Protectionpreventssingle phasing
Patent US5587570 - Circuit breaker interlock unitto preventsingle phasing
when a multipole circuit breaker opens all poles openpreventingsingle - phasing
that a circuit breaker will be tripped when any current limiter has blownpreventingsingle phasing
When any fuse blows , the Open - Fuse Lockout trips the breakerto preventsingle - phasing
Assigned to Bayer Corp. , Tarrytown , N.Y. Circuit breaker interlock unitto preventsingle phasing
Dec 24 , 1996 General Electric Company Circuit breaker interlock unitto preventsingle phasing DE3331823A1
when only one fuse interrupts in a circuit during a phase to ground fault(passive) is causedSingle phasing
the use of single - phase protection devices such as fuses and circuit breakers(passive) is caused bySingle phasing
the phasesthus preventingsingle phasing
so if one leg overloads , power to all legs are removedto prevent' single phasing
we would be disconnectedpreventssingle phasing
one phasecausingsingle phasing
Mechanically - interlinked tripping devices in multiple unitspreventssingle phasing
blown fuses(passive) caused bysingle - phasing
loose wire connectionscausingsingle - phasing
three - phase interruptionsto preventsingle - phasing
the systemmay causesingle - phasing
If a single current - limiting fuse clears a fault , the MVI will sense an imbalance and tripto preventsingle phasing
one cobtactor contactcausingsingle phasing
which simultaneously opens all ungrounded conductors in lieu of fusesto preventsingle phasing
the blowing of one of the three back - up fuses(passive) can be caused bySingle - phasing
an open phase on the primary side of the transformer bank(passive) caused bya single - phasing
not to rely on standard , three - overload startersto preventsingle - phasing
source - line burndown(passive) could be caused bysingle - phasing
Defective contacts in three phase breakerscan also causesingle phasing
the contactor Failurecausingsingle phasing
a bad contactor , a loose wire , or a faulty winding in the motor(passive) may be caused bysingle phasing
Nothingcan preventsingle phasing
no single devicecan preventsingle phasing
orderto prevent" single - phasing
Blowing of single HRC fuse will trip LBS immediatelyto preventsingle phasing
a blown fuse , broken wire , or worn contact(passive) Typically caused bya single phasing
also(passive) might ... be causedSingle phasing
oxidation layerpromptingsingle phasing
serious damage to motorscan causeserious damage to motors
burns and distortion to one windingcausesburns and distortion to one winding
the overload damage(passive) caused bythe overload damage
in severe electrical or mechanical damagecan resultin severe electrical or mechanical damage
a motor to run hot , not start after stopping , lose significant efficiency and potentially results in damage to the motor and its connected loadcausesa motor to run hot , not start after stopping , lose significant efficiency and potentially results in damage to the motor and its connected load
negative phase sequence components in the voltagecausesnegative phase sequence components in the voltage
the phase to phase voltages you measured(passive) 've seen caused bythe phase to phase voltages you measured
on the primary source voltage or the secondary source voltagecan originateon the primary source voltage or the secondary source voltage
from blown fused link(sresultingfrom blown fused link(s
more amp draw than the overloads are rated for on the other lines providing power to the motorcausingmore amp draw than the overloads are rated for on the other lines providing power to the motor
in burning of motorswill resultin burning of motors
sustained overloads or overcurrent conditions(passive) caused bysustained overloads or overcurrent conditions
the two phases that remain energized in a three - phase motor to increase current by an average of 173 %will causethe two phases that remain energized in a three - phase motor to increase current by an average of 173 %
a problematic situation for a three - phase motor that can continue to operate by drawing more current ( thus more heat ) on the remaining two phasescreatesa problematic situation for a three - phase motor that can continue to operate by drawing more current ( thus more heat ) on the remaining two phases
excessive noise and vibration in motorscan sometimes causeexcessive noise and vibration in motors
extreme magnetic unbalance , reduction in torque and over heating due to negative phase sequence currentsmay causeextreme magnetic unbalance , reduction in torque and over heating due to negative phase sequence currents
to unwanted motor vibrations causing mechanical wear Reducing the life of your motor from the extra heat on the other two phases 13 5can leadto unwanted motor vibrations causing mechanical wear Reducing the life of your motor from the extra heat on the other two phases 13 5
severe burning and distortioncausessevere burning and distortion
very high negative sequence voltage and current and low Vln or Vll voltagescausesvery high negative sequence voltage and current and low Vln or Vll voltages
alsocausesalso
to unwanted motor vibrations in addition to the results of unbalanced phasescan leadto unwanted motor vibrations in addition to the results of unbalanced phases
to one of the ' hot ' phase wires to become overloadedleadsto one of the ' hot ' phase wires to become overloaded
to unexpected losscan contributeto unexpected loss
in unbalanced stator currentsresultsin unbalanced stator currents
to 14 % of all motor failuresleadsto 14 % of all motor failures
from acts of nature or system operations not directly controlled by DLPUD personnelresultsfrom acts of nature or system operations not directly controlled by DLPUD personnel