How to working Thermostat, how to check thermostat

How to working Thermostat,  how to check thermostat

Checking Thermostat at 75 Degree Celsius 


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Basic Power Factor Theory:   Power Factor compares the active power (kilowatts or kW) with apparent power (KVA) that is demanded from the power source. It is also a comparison of the active current to the total current, as shown in the triangle below. It is also equal to the cosine of the angle of displacement between the voltage and current waveform. The ratio of actual power to apparent power is usually expressed in percentage and is called power factor.   Generally the Transformers are inductive loads and cause very low power factor during their testing. Inductive equipment needs magnetizing power to produce the flux necessary for the operation of inductive devices. The unit of measure of magnetizing or reactive power is the kilovar (kVAR). The active power (kW) and reactive power (kVAR) together make up apparent power which is measured in kilovolt-amperes (kVA). By representing these components (kW and kVAR) of apparent power (kVA) as the sides of a right triangle, we can ...
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  Transformer losses 1.       Core loss or Iron loss   a.       Hysteresis loss in transformer : Hysteresis loss is due to reversal of magnetization in the transformer core. This loss depends upon the volume and grade of the iron, frequency of magnetic reversals and value of flux density.   Steinmetz formula: W h = ηB max 1.6 fV (watts) where,   η = Steinmetz hysteresis constant              V = volume of the core in m 3                  F = Frequency   Energy loss in a transformer (Eddy current in the core )   b.       Ed dy current loss in transformer : In transformer, AC current is supplied to the primary winding which sets up alternating magnetizing flux. When this flux links with secondary winding, it produces induced emf in it. But some part of this flux also gets...
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