How are stray losses calculated?
Table of Contents
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 meant by stray losses in DC machine?
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 stray loss 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.
What are stray losses in synchronous generator?
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.
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.
What is eddy current loss?
When an alternating magnetic field is applied to a magnetic material, an emf is induced in the material itself according to Faraday’s Law of Electromagnetic induction. Similar to hysteresis loss, eddy current loss also increases the temperature of the magnetic material. …
What is a stray loss?
Stray load loss: The combination of friction losses due to moving of bearing and shaft and windage losses due to air gap is called stray loss.
What is the meaning of stray losses?
What is dielectric loss transformer?
Dielectric loss occurs in the insulating material of the transformer that is in the oil of the transformer, or in the solid insulations. When the oil gets deteriorated or the solid insulation get damaged, or its quality decreases and because of this, the efficiency of transformer is effected.
What is stray losses in motor?
Stray loss refers generally to any induction machine loss not accounted for by the standard calculations of primary copper loss, secondary copper (or slip) loss, core loss measured at no load, or friction and windage.
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 Coil losses?
Definition: Power loss in a transformer due to the flow of current. These losses are present only when the transformer is serving a load. Load losses vary by the square of the current magnitude.