What are the main type of stator winding faults?

Different types of stator winding faults are (i) short circuit between two turns of same phase—called turn-to-turn fault, (ii) short circuit between two coils of same phase—called coil to coil fault, (iii) short circuit between turns of two phases—called phase to phase fault, (iv) short circuit between turns of all …

What is stator winding fault?

Stator faults usually start as inter-turn short circuits. In fact the primary or main cause of the stator faults is insulation degradation which leads to inter-turn short circuits. When an inter-turn short circuit occurs, extremely high currents flowing in the short circuited coil cause the propagation of destruction.

What is the probable reason for failure in this 3 phase stator winding?

TYPICAL CAUSES OF WINDING FAILURES IN THREE·PHASE STATORS failure is the result of an open power source, a poor the insulation in all phases of in one phase of the power connection at the motor the motor normally is caused supply to the motor.

What is stator winding fault in alternator?

In the case of resistance neutral earthing the neutral point of stator winding is connected to the ground through a resistor. Here, one current transformer is connected across the neutral and earth connection of the alternator.

What causes stator to go bad?

To answer why stators fail, it is because the coating on the windings breaks down, usually because of heat, causing a short which can also burn the fine wire of the winding in two at the short causing an open circuit. The way to prevent failures is to prevent the heat.

What is rotor earth fault?

The Rotor Earth Fault Protection Device consists of a current injection device which applies an AC voltage to the rotor winding by means of a slip ring fitted on the rotor. The current is applied to the rotor through a coupling capacitor.

What causes stator winding failure?

Abstract: Stator winding failures are generally attributed to groundwall or turn insulation failures. The failure mechanism involves the gradual development of a weakness in the insulation. This surface discharge can lead to rapid winding failure following the inward motion of the corona activity.

What is the most important stator winding fault of an alternator?

Answer: Stator winding fault. It is the most severe fault and considered most important for alternator protection. This vital protection of alternator stator is Differential circulating current scheme or Mertz price differential current protection scheme of alternator is discussed in a separate post.

What is Interturn?

Adjective. interturn (not comparable) (electrical engineering) Between turns of a winding.

Can a stator go bad from sitting?

Stators do not go bad from sitting unless the mag housing is full of water.

Is there a way to detect a stator fault?

Detection of incipiently occurring faults, especially in large machines can be cost effective. In the case of stator faults, for motors and generators with windings rated 4 kV and above the partial discharge based methods are reliable; however for low voltage motors stator fault detection procedures are yet to be standardized [1].

How is the current amplified during a stator fault?

Penman et al. analyzed motor current spectrum under faulty conditions (inter-turn short circuit) [19]. They have illustrated that the rotor slot harmonics (RSH) in the motor current are amplified under stator winding fault conditions.

What causes insulation in a stator winding to fail?

This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surge. This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surge. Thermal deterioration of insulation in one phase of the stator winding can result from unequal voltage between phases.

What causes a stator fault in an induction motor?

Stator faults usually start as inter-turn short circuits. In fact the primary or main cause of the stator faults is insulation degradation which leads to inter-turn short circuits.

What are the main type of stator winding faults? Different types of stator winding faults are (i) short circuit between two turns of same phase—called turn-to-turn fault, (ii) short circuit between two coils of same phase—called coil to coil fault, (iii) short circuit between turns of two phases—called phase to phase fault, (iv) short circuit…