What are stray losses?
Table of Contents
- 1 What are stray losses?
- 2 How do dc machines reduce stray losses?
- 3 What is stray loss and constant loss?
- 4 What are stray losses in transformers?
- 5 What is eddy current loss in DC machine?
- 6 How do the losses affect the machine?
- 7 What are the causes of stray losses?
- 8 What are the stray load losses in DC machine?
- 9 What is meant by stray loss?
- 10 What are stray losses in Mechanical Engineering?
What are stray losses?
The stray losses / circulating current losses are the source of heat generation in the transformer and ultimately paper insulation aged or loses its insulation property or strength & failed during course of its service rendering the short of life expectancy.
How do dc machines reduce stray losses?
How to reduce the loss lost in a DC machine? Damage to DC machines is mainly caused by three different sources such as resistive, magnetic, and switching. To reduce magnetic and hysteresis damage, cover the magnetic core to prevent eddy currents.
How are stray losses calculated?
Formulas in spreadsheet
- HV Full load current = VA / (1.732 · Volt)
- LV Full load current = VA / (1.732 · Volt)
- HV Side I2R losses = I²R · 1.5.
- LV Side I²R losses = I²R · 0.5 · 3.
- Total I² R lossses at Amb.
- Total Stray losses at Amb.
- I²R lossses at 75° C temp = ((225 + 75) · losses) / (225 + Amb.
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.
What are stray losses in transformers?
The stray losses in transformer metallic parts are caused by magnetic leakage flux generated basically by the current passing through the windings but also by the high-current loops outside the windings.
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 eddy current loss in DC machine?
Eddy Current Loss in DC Machine According to Faraday’s law of electromagnetic induction, when an iron core rotates in the magnetic field, an emf is also induced in the core. This current is useless for the machine. This loss of current is called eddy current. This loss is almost constant for the DC machines.
How do the losses affect the machine?
During this process, the total input power is not transformed into output power. Some part of input power gets wasted in various forms. The form of this loss may vary from one machine to another. These losses give in the rise in temperature of the machine and reduce the efficiency of the machine.
What are the different types of losses in DC machine?
There are four internal losses that contribute to lower efficiency of a DC generator.
- Copper losses.
- Eddy-current losses.
- Hysteresis losses.
- Mechanical losses.
What are the causes of stray losses?
Stray loss is mainly caused by leakage flux from winding, but structures closer to the winding will tend to be affected easier by leakage flux. The ratio of stray loss relative to all losses may not necessarily be large but heat is generated in certain areas and may become an issue in the operation of transformers.
What are the stray load losses in DC machine?
Stray Losses in dc machine. These losses are the miscellaneous type of losses. The following factors are considered in stray load losses. The distortion of flux because of armature reaction. Short circuit currents in the coil, undergoing commutation.
What are the losses of a DC machine?
LOSSES OF DC MACHINE IS DIVIDED IN TO COPPER LOSSES AND STRAY LOSSES. STRAY LOSSES FURTHER DIVIDED IN TO IRON LOSSES AND MECHANICAL LOSSES. MECHANICAL LOSS CONSISTS OF FRICTION LOSS AND WINDAGE LOSS. AND It IS 10 TO 20 PERCENTAGE OF FULL LOAD LOSSES. IRON LOSS IS 20 TO 30 PERCENT AND CALLED CORE LOSS.
What is meant by stray loss?
Stray loss is the unavoidable loss arising out of reasons / factors beyond our control. This includes losses in wires or conductors, transformer iron and copper loss, leakage losses in insulation or dielectrics.
What are stray losses in Mechanical Engineering?
In addition to the losses stated above, there may be small losses present which are called as stray losses or miscellaneous losses. These losses are difficult to account. They are usually due to inaccuracies in the designing and modeling of the machine. Most of the times, stray losses are assumed to be 1\% of the full load.