Power factor is the percentage of consumed power(KW) versus supplied power(KVA). This is important because a low power factor can waste energy, result in inefficient use of electrical power, and often result in higher energy bills.

Power Factor Correction will improve the energy efficiency of any electrical system, but a reduction in your power bill is only available where a power company charges a power factor penalty. Typically the penalty takes the form of a KVA Demand charge. Steelman will be happy to help you determine if you are paying a power factor penalty.

There are several types of Power Factor Correction: Fixed capacitor banks, Automatic capacitor banks and Static Var Generator. Automatic capacitors banks are also known as switched capacitors. Automatic capacitors vary the amount of correction (KVAR) supplied to an electrical system, while fixed capacitors supply a constant amount of correction (KVAR). Automatic capacitors are made up of banks that are switched off and on by a microprocessor controller based on the plant electrical load at any given time. Automatic capacitors are installed at the main incoming power source, while fixed capacitors are generally installed at individual motor loads throughout a plant.

Static Var Generator ,also known as active power factor  compensators (APFC) or instantaneous stepless reactive power  compensators are the ultimate answer to power quality problems  caused by low power factor and reactive power demand for a wide  range of segments and applications.

There are different ways to arrive at the correct amount of KVAR for a given application depending on the information available to you. The IEEE provides standard tables that allow you to choose a KVAR rating for individual motors based on horsepower and RPM rating. Additionally, some motor manufacturers recommend a maximum KVAR rating. Also, the required KVAR can be calculated if you have the following information: Current power factor, desired power factor, and total(max) load (KW) .

The answer to this varies with each installation. If you have just a limited number of motors that need correction, it would be advisable to put a fixed capacitor at each motor. If you have a large plant with varying loads and numerous motors, an automatic capacitor may be better. Other factors to consider are maintenance and “down-time”. A fixed capacitor requires less maintenance and if the unit goes down, you have not lost all of your correction abilities. If you need to replace or work on an automatic capacitor, it may require taking the whole plant down or losing all of your correcting ability for a length of time. Additionally, capacitors cannot be directly connected to some equipment. As you can see there are many factors to consider when choosing fixed or automatic capacitors.

ZDDQ low voltage capacitor banks

ZDDQ medium voltage capacitor banks

ZDDQ low voltage Static var generator

ZDDQ medium voltage statcom