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In a 3 phase power system, say for a 3 phase motor - it is necessary to have all three phases intact to be able to run the motor efficiently, safely. If any one phase fails , the motor still continues to run but the temperature raises rapidly, due to high current. The motor winding can burn out, can trip off due to overload.
Hence a device called phase failure relay is connected. It constantly reads all the 3 phases and cuts off the main supply in case any one phase fails.
What else can I help you with?
What is a fail passive and a fail operational auto pilot system in aircrafts?
Fail-passive Automatic Landing System An automatic landing system is fail-passive if, in the event of a failure, there is no significant out-of-trim condition or deviation of flight path or attitude - but the landing is not completed automatically. NOTE: For a fail-passive automatic landing system the pilot assumes control of the aircraft after a failure. The following are typical arrangements: (1) A monitored automatic pilot in which automatic monitors will provide the necessary failure detection and protection. (2) Two automatic pilots with automatic comparison to provide the necessary failure detection and protection. Fail-operational Automatic Landing System. An automatic landing system is fail-operational if, in the event of a failure, the approach, flare and landing can be completed by the remaining part of the automatic system. NOTE: In the event of a failure, the automatic landing system will operate as a fail-passive system. The following are typical arrangements: (1) Two monitored automatic pilots, one remaining operative after a failure. (2) Three automatic pilots, two remaining operative (to permit comparison and provide necessary failure detection and protection) after a failure.
What is a standby phase?
Standby phase is in a yugioh duel after draw phase,you could use card effect at standby phase.
Bode Plot Is applicable to minimum phase network or non minimum phase network?
minimum phase network
Three phase voltage in india?
It is 230V single phase and 440V in 3 phase system at 50 Hz.AnswerIf the single-phase voltage is 230 V, then the three-phase voltage must be 400 V, not 440 V. The line voltage is 1.732 times the phase voltage.
What is single phasing preventor?
Single phasing preventor is an electronic circuit which prevents the Thee phase operated Electrical machines from single phase cut off, Phase reversal and phase imbalance.
How do you do for phase sequence protection at three phase motor operation?
motor is designed to operate in forward and reverse direction for the purpose of elevator. Phase sequence protection is not required.
What is phase failure relay?
These relay sense the Negative Sequence Voltage components of system supply & offers protection against Phase Failure, Phase Sequence Reversal with Under/Over Voltage conditions which are dangerous to motor winding and cause motor burnouts.
What is the type of generator protection to protect against unequal phase current?
differential protection
What is the phase when chromatids fail to separate properly?
The phase when chromatids fail to separate properly is called nondisjunction. This can result in an abnormal distribution of chromosomes in the daughter cells, leading to genetic disorders such as Down syndrome.
Should a starting windings in the split phase motor fail to energise what would be the result?
what will be the result if the starting winding in a split phase motor fails
What is a digital overload protection device for 3 phase motors?
3
What sort of protection scheme do you suggest for the protection of a 10 HP motor?
1)Instantaneous overcurrent protection. 2.Ground fault protection. 3.Thermal overload protection. 4.Stalling Protection. 5.Phase unbalance protection.
What happen when only one phase of three phase generator is fully loaded?
any more load will add to that phase ,over current protection will trip the generator.
How is a IDMT relay used to give protection against a phase to earth fault a phase to phase fault on a feeder?
As with any IDMT relay the higher the fault current the quicker the trip time.
Acute phase for sprained ankle?
P.R.I.C.E.S protection rest ice compression elevation support
What level of protection will you need to work with or near contamination materials during the phase of the CCOR?
4
Nomaleficence is an ethical principle that is based on this phase?
never knowingly do harm to patients. protection of patients
