What are stray load losses?

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 flux in transformer?

Stray losses in steel parts of the transformers occur due to the stray field of the main windings, leads and connecting conductors. Flux lines of the stray field of a single pair of main windings (same core limb, phase) close predominantly across the top and the bottom of the windings.

What are dielectric losses in transformer?

Dielectric losses are caused by the insulating material and insulation such as transformer oil. It rarely occurs as compared to the core and copper losses. If the transformer oil or insulation capacity gets deteriorated, the dielectric loss increases.

What is stray losses in DC motor?

According to this standard, the stray load losses 1n d.c. machinery are defined as the sum of the following par- tial losses: (1) Additional core loss due to the flux from arma- ture windings excited by load current (2) Eddy currents in the armature windings (3) Short circuit loss of commutation.

What is the purpose of conducting open circuit test?

The purpose of the open-circuit test is to determine the no-load current and losses of the transformer because of which their no-load parameters are determined. This test is performed on the primary winding of the transformer.

What are the 2 types of losses?

Types of Losses in a Transformer

• Iron Losses.
• Hysteresis Loss.
• Eddy Current Loss.
• Copper Loss Or Ohmic Loss.
• Stray Loss.
• Dielectric Loss.

What are the two types of losses?

Terms in this set (5)

• necessary losses. Losses that are replaced by something different or better, natural and positive part of life.
• actual loss.
• perceived loss.
• maturational loss.
• situational loss.

What are losses in motor?

Intrinsic losses are of two types: fixed losses – independent of motor load, and variable losses – dependent on load. Fixed losses consist of magnetic core losses and friction and windage losses. Magnetic core losses (sometimes called iron losses) consist of eddy current and hysteresis losses in the stator.

What are iron losses?

Definition of iron loss : the loss of available energy by hysteresis and eddy currents in an electromagnetic apparatus (as a transformer) — compare copper loss.

What are hysteresis losses?

Hysteresis loss is caused by the magnetization and demagnetization of the core as current flows in the forward and reverse directions. A hysteresis loop shows the relationship between the induced magnetic flux density (B) and the magnetizing force (H). It is often referred to as the B-H loop.

What causes stray losses in Transformers?

Leakage field present in the transformer induce eddy currents in conductors, tanks, channels, bolts etc and these eddy currents give rise to stray losses. Refer photo of complete Tank with cover and Channels / Frame Parts figure- 6&7.

What is the difference between iron loss and stray loss?

In case of transformer there is no rotating part so there is no windage loss or frictional loss. As hysteresis loss and eddy current loss take place in the iron core of transformer, bth losses the termed together as iron loss. Stray losses are additional eddy losses in the structural parts and within the winding.

What is load loss in a transformer?

Load loss in Transformer is sum of copper loss and stray loss. This stray loss is further classified into eddy current loss in winding and eddy current loss in support structures like flitch plate, frames and tank.

What are hysteresis and eddy current losses in Transformers?

Hysteresis and Eddy current losses both occur in the transformer core. The former on the quality of core lamination and latter the thickness and resistance of the core used to construct the core. Stray losses are also called iron losses.