China Cheap price XJM7-J Measuring box (Infrastructure Energy Measurement Box) to America Factories
Exterior and dimensions
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XJM7-J metering box (infrastructure power metering box) is suitable in power supply system with AC 50HZ, rated voltage 380 / 220V , as the power measurement in construction site.
Meet GB7251.1-1997 and GB7251.3-1997 standards.
The data plate for the air conditioner calls for a 20 amp breaker. This breaker is a 30 amp breaker.
Notes is available at http://zenmurali.blogspot.in/
AC FUNDAMENTALS – PART – 10
SIGNIFICANCE OF POWER FACTOR
Alternators and Transformers and Circuit Breakers are rated in kVA because the power factor of the load is not known when the machinery is manufactured in the factory.
CAUSES OF LOW POWER FACTOR
The low power factor is mainly due to the fact that most of the power loads are inductive and, therefore, take lagging currents.
1. Single phase and three phase induction motors which have low lagging p.f. (Inductive load).
2. The motors work at a power factor which is extremely small on light load (0.2 to 0.3) and rises to 0.8 to 0.9 at full load.
3. Arc lamps, electric discharge lamps and electric furnaces and welding equipments operate at low lagging power factor.
4. The load on the power system is varying; being high in the morning and evening and low at other times.
5. Low load period, supply voltage is increased which increases the magnetization current which leads to poor power factor.