What is stray load loss?

The stray load loss can be regarded as the difference of the total iron losses and harmonic rotor cage losses between the no load and load conditions.

What is stray load losses in induction motor?

Stray load loss refers generally to the sources of induction machine loss not accounted for by typical calculations of primary or secondary copper loss, no load core loss, or friction and windage loss.

What do you mean by stray load loss of an alternator?

Stray load losses – These are losses caused by the load current due to changes in the magnetic flux distribution, eddy currents and harmonics. They can be reduced by using better materials and thinner laminations.

How are stray losses calculated?

What is the cause of occurrence of stray load losses in transformer?

All the magnetic field produced by the primary is intercepted by the secondary winding, an e.m.f induced in that winding, this is called back e.m.f and current is called eddy current (As per Lenz's Law ) this eddy current is a cause of losses in the transformer winding and the losses so produced in the transformer ...

stray load losses in transformer

What is stray losses in machines?

Standards report us that the stray-load loss is that portion of losses in a machine not accounted for by the sum of friction and windage, stator I²R loss, rotor I²R loss and core loss.

What is stray loss and constant loss?

Notice that, as Stray Load loss depends upon the load current therefore it is categorized under variable loss while Mechanical Loss (independent of load current) comes under constant loss. No load Iron Loss is constant and therefore it is under Constant Loss.

How do you calculate load loss?

The calculation of load (Copper) losses are based on the ratio of the current being measured and the rated full load current squared and the results multiplied by load (copper) losses from the data sheet.

Which test gives us stray losses?

Abstract: A loading-back test has been used for the determination of the stray load losses in polyphase induction machines. This test, which was found to have a high degree of accuracy, enables the various losses to be separated. The application of the test is simple and convenient.

What is load loss in transformer?

Transformer losses are produced by the electrical current flowing in the coils and the magnetic field alternating in the core. The losses associated with the coils are called the load losses, while the losses produced in the core are called no-load losses.

What is the cause of the stray load losses in the synchronous machine?

What is the cause of the stray load losses in the synchronous machine? Explanation: The stray load loss occurs due to stray fields. They are formed when the machine is being loaded.

What is stray losses in synchronous motor?

The stray losses in the rotor, generally grouped under the heading of rotor surface losses, are shown to be due to several effects, notably those due to the concentration of ampere-conductors in one slot and to the irregularities present in the stator m.m.f. wave.

How do you calculate alternator loss?

TotalLosses=3?2???+????+??+?misc. The copper losses in the armature winding vary as the square of armature current in the armature winding. As the armature current varies and hence the armature copper losses.

What is windage loss?

Windage loss in a generator is the power absorbed by the fluid surrounding the rotor. as a result of the relative motion between the rotor and the stator.

What are the losses in a 3 phase induction motor?

There are three main types losses in induction motor: Copper losses. Iron losses. Friction and windage losses.

What is core loss current?

Core loss is the loss that occurs in a magnetic core due to alternating magnetization, which is the sum of the hysteresis loss and the eddy current loss.

What are stray losses in DC motor?

Stray Losses :

The loss due to sparking between the brushes and commutator segments, loss due to the armature reaction effect that distorts the flux distribution, and many more are considered as stray losses. Since they are difficult to measure, stray losses are considered as 1% of the total output power.

What is eddy current loss?

If an eddy current of magnitude I flows through a core path of resistance r, it will dissipate energy in the form of heat according to the power equation power = I2R. Since this represents energy being expended for no useful purpose, it is considered as an eddy current loss, sometimes called iron loss.

What causes hysteresis loss?

Hysteresis loss is caused by the magnetization and demagnetization of the core as current flows in the forward and reverse directions. As the magnetizing force (current) increases, the magnetic flux increases.

What are different types of losses in transformer?

Why the rating of transformer is in kVA?

The copper and iron are the two types of losses that occur in the transformer. The copper loss depends on the current (ampere) flows through the windings of the transformer while the iron loss depends on the voltage (volts). i.e., the rating of the transformer is in kVA. Was this answer helpful?

What is constant loss?

Constant losses are those losses that always occur irrespective of the load conditions and whose value remains constant for a given machine. Mechanical losses, core losses, and shunt field copper losses are included in constant losses.

What is iron loss in motor?

Iron losses can be divided into hysteresis losses, eddy current losses and additional losses. Iron losses are given per weight and depend on the frequency and the maximum flux density. This means that the faster the motor rotates, the higher the iron losses.

How many types of losses are there in an electrical machine?

The losses that occur in a DC Machine is divided into five basic categories. The various losses are Electrical or Copper losses (I²R losses), Core losses or Iron losses, Brush losses, Mechanical losses, Stray load losses.