What is the power factor of mercury vapour lamp?
Discharge lamps
| Type of lamp (W) | Power demand (W) at | Current In (A) |
|---|---|---|
| PF corrected | ||
| 131 | 154 | 0.69 |
| Mercury vapour + metal halide (also called metal-iodide) | ||
| 70 | 80.5 | 0.40 |
Are mercury vapor bulbs efficient?
Mercury vapor lamps are more energy efficient than incandescent and most fluorescent lights, with luminous efficacies of 35 to 65 lumens/watt. Their other advantages are a long bulb lifetime in the range of 24,000 hours and a high intensity, clear white light output.
What is a con with mercury vapor light?
Phasing Out — Probably the largest con to mercury vapor lamps is that the United States government is working on phasing them out as a lighting option. In fact, the passing of the Energy Policy Act of 2005 banned mercury vapor ballasts in the US.
How is the power factor of a discharge lamp improved?
The power factor can be improved by connecting a capacitor in parallel with the inductive load. As we know that capacitor draws a leading current which can neutralize the lagging power factor produced by the inductive loads.
Why are Hg vapor lamps preferred than Na lamps?
Historically, the advantages of Mercury vapor lamps is that they are more energy efficient than incandescent and most fluorescent lights, especially for outdoor applications, with luminous efficacies of 35 to 65 lumens/watt.
Can I replace a mercury vapor bulb with an LED bulb?
Retrofit is a direct replacement of the conventional halogen or high pressure sodium bulbs with LED lamps. After the replacement of 175W mercury vapor lamps with LED, you can enjoy 80,000 hours life span and flicker free illumination.
What are the methods to improve power factor?
There are three main ways to improve power factor:
- Capacitor Banks.
- Synchronous Condensers.
- Phase Advancers.
What are the causes of low power factor?
Some causes of low power factor are a) The presence of harmonic current in the system reduces power factor. b) Improper wiring leads to three-phase imbalance causing low power factor. c) When the system is loaded lightly, the voltage increases, increasing the magnetization current demand of the machine.
What are the causes of poor power factor?
How do you fix low power factor?
You can improve power factor by adding power factor correction capacitors to your plant distribution system. When apparent power (kVA) is greater than working power (kW), the utility must supply the excess reactive current plus the working current . Power capacitors act as reactive current generators .
What are the factors affecting power factor?
What Affects Power Factor?
- Linear resistive loads. Voltage and current are in phase with power factor equal to 1.0 for purely resistive loads.
- Inductive loads. Voltage and current are out of phase for linear non-resistive/reactive loads.
- Non-linear loads.
What are the signs of low power factor?
If residential electrical loads contain low power factors, then this leads to huge increases in power to perform a task. Thus energy consumption is increased, which increases the cost of equipment or installations. A poor power factor creates high voltage drops in the power distribution network.
What causes a poor power factor?
The main cause of low Power factor is Inductive Load. As in pure inductive circuit, Current lags 90° from Voltage, this large difference of phase angle between current and voltage causes zero power factor.