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What is the effect of insulation failure in three phase system?
Wiki User
∙ 11y ago
ground faults are the most common problem.
Wiki User
∙ 11y ago
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What are the effects to the transformer insulation of single phasing on a three phase Delta-Wye connection?
The effect of the insulation is to stop electric currents flowing where they should not.
What is the normal insulation leakage current in three phase motor?
zero insulation leakage is known as a ground fault AC, DC, single phase, 3 phase .... same answer on a damp day or with water present it may be a bit higher than zero there is no perfect insulation if you have more than a milliamp you have problems
What is inter-turn fault in three phase motor?
An 'inter-turn' fault occurs when adjacent turns of the same winding are short circuited (due, for example, to insulation breakdown). This affects the turns ratio of the transformer. An 'inter-winding' fault occurs when there is a short circuit between adjacent windings (coils) due to insulation breakdown, and can lead to a catastrophic failure of the transformer.
What is the effect of Phase sequence change in 3 phase supply?
It is important to keep the phase sequence the same throughout the system but it is more important to connect the transformers up with the right polarities. Never close a delta connection without a test fuse wire first, for correct transformer polarity connection.
In a modern industrial plant the most likely polyphase power system in use is a A. one-phase system. C. three-phase system. B. two-phase system. D. four-phase system.?
A "three-phase system" is a polyphase system having three phases. The term "polyphase system" just means a system having multiple phases. If it is used by itself, "a polyphase system" doesn't mean "a three-phase system".
What are the effects to the transformer insulation of single phasing on a three phase Delta-Wye connection?
The effect of the insulation is to stop electric currents flowing where they should not.
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 ideal insulation resistance to earth for a single phase and three phase motor?
Infinity
Why are the insulation resistance values higher for test between phase than between phase and ground?
When testing two cables there is twice the the amount of insulation, as opposed to one cable to ground.
What is the normal insulation leakage current in three phase motor?
zero insulation leakage is known as a ground fault AC, DC, single phase, 3 phase .... same answer on a damp day or with water present it may be a bit higher than zero there is no perfect insulation if you have more than a milliamp you have problems
What would be the effect on the neutral bar of a 3 phase D B if the main incoming neutral is lost?
A three phase delta system does not use a neutral in its operation.
What is the voltage of other two phase of 3 phase system when One phase is open?
If you mean 'phases' and not 'lines', then the loss of a phase has no effect on the voltages provided. You will still obtain three voltages, displaced from each other by 120 degrees.
What is inter-turn fault in three phase motor?
An 'inter-turn' fault occurs when adjacent turns of the same winding are short circuited (due, for example, to insulation breakdown). This affects the turns ratio of the transformer. An 'inter-winding' fault occurs when there is a short circuit between adjacent windings (coils) due to insulation breakdown, and can lead to a catastrophic failure of the transformer.
What effect does the moon phase have on relationships?
The moon phase has no effect on relationships, that's just a rumor.
What is the effect to a three phase system if a single phase load is drawn from it?
A single-phase load can be connected to a three-phase supply either by connecting it between any pair of line conductors or, for a three-phase, four-wire, system, between any line conductor and the neutral conductor -providing, of course, that the resulting voltage matches the requirement of the single-phase load. This is quite a common arrangement, and the utility company will always try to maintain a reasonably 'balanced' load by connecting a number of single-phase loads between alternate line conductors (e.g. A-B, B-C, C-A, etc., or A-N, B-N, C-N, etc.). So, to return to the question: 'What is the effect on a three-phase system if a single-phase load is connected to it?', the answer is that the three-phase system can normally deal with it without any problem.
What is the effect of Phase sequence change in 3 phase supply?
It is important to keep the phase sequence the same throughout the system but it is more important to connect the transformers up with the right polarities. Never close a delta connection without a test fuse wire first, for correct transformer polarity connection.
What is the cause of unsymmetrical three phase short circuit?
By definition a short circuit is the path of least resistance of current flowing through a circuit be it three phase or single phase. The main cause of this condition in electrical circuits is an insulation break down. This break down can be caused by overheating of the insulation to a point where the insulation disintegrates from the conductor that it is supposed to be protect. With the insulation missing from the wire there is the possibility of a short circuit to surrounding grounded material. The other cause of insulation break down is from vibration. Unsupported conductors can vibrate against their metallic enclosures to a point where the insulation is just worn away. Once the insulation becomes thin enough the voltage will bridge the insulation threshold and take the path of least resistance to ground and a short circuit will occur.
