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How to convert kW to kVA

2017-08-31 1:42:00 AM

How to convert real power in kilowatts (kW) to apparent power in kilovolt-amps (kVA).

kW to kVA calculation formula

The apparent power S in kilovolt-amps (kVA) is equal to the real power P in kilowatts (kW), divided by the Power Factor PF:

S(kVA) =  P(kW) PF

So kilovolt-amps are equal to kilowatts divided by the power factor.

kilovolt-amps = kilowatts / PF

or

kVA = kW / PF

Example

What is the apparent power in kilovolt-amps when the real power is 3 kW and the power factor is 0.8?

Solution:

S = 3kW / 0.8 = 3.75kVA

Posted in Ballast & LED Driver By Ballast & Transformer Team

Isolation Transformer

Transformers with primary (input) and secondary (output) windings separated from each other are known as isolation transformers. Under this construction, the input power and the output power are electrically separated by an dielectric insulation barrier.

 

Isolation Transformer Winding Diagram

Isolation Transformer

 

 

Advantages of using an isolation transformer

  • The primary and secondary winding can be constructed as a step-up or step-down transformer to match the load in the electrical system
  • Preventing the equipment from getting spikes and harmonics from the mains
  • Safety. There will be no conductive connection between the live part of the circuit and earth. With the isolating transformer, there is no danger in touching the live while the body is earthed.
  • By connecting the electrical system safety ground to the neutral conductor on the transformer secondary, it eliminates neutral-to-ground voltage and noise. This resolves reliability problems for microprocessor-based electronics.

Isolating transformers are also the most common kind of transformers for voltage step-up and step-down usage.However, 1:1 ratio transformers, where input and output voltage are the same, are also widely used to solely take advantage of the isolation.


Autotransformer

Step-down Autotransformer

Step-up Autotransformer
Step-down Autotransformer Step-up Autotransformer

 

In an autotransformer, the primary and secondary share a common winding. The secondary voltage always has a common terminal with the primary. Step up or down of the voltage is achieved by a tap from the winding measuring from the common end. For example, a secondary tap at 50% of the winding will produce a voltage half of the input.

Advantages of using an Autotransformer

  • Lighter in weight and smaller in physical size as it requires fewer windings and a smaller core.
  • Less costly compared to an isolation transformer.
  • The advantages listed typically are for autotransformer with voltage ratio ranging up to 3:1 voltage or vice versa. Beyond this range, an isolation transformer is usually more economical.

Limitations

  • There is no isolation between the primary winding and the secondary winding. Therefore protection of the equipment is dependant on the supply devices.
  • As the primary and secondary share a common end, if the neutral side of the primary voltage is not grounded, the secondary side will not be either.
  • A failure of the winding insulation of the autotransformer will result in full input voltage applied to the output.
Posted in Hold-Tite Fasteners Hand Dryer - FAQs By Ballast & Transformer Team

About Leviton OBC AFCI Receptacles

As a market leader in electrical wiring devices, Leviton has introduced an OBC AFCI Blank Receptacle which addresses the dangers associated with both types of potentially hazardous arcing – parallel and series arcing. Similar to GFCIs, AFCI receptacles provide feed-through protection and are able to detect downstream parallel and series arc-faults, as well as upstream series arc-faults. Utilizing an AFCI receptacle offers homeowners the benefit of localized Test and Reset, providing a convenient option to AFCI breakers.

 

The Difference between AFCI and GFCI outlets

AFCIs and GFCIs are both important devices to incorporate into a home’s electrical system. It is important to recognize, however, that although they are similar in appearance they offer very different protection. The AFCI blank receptacle is designed to provide protection from electrical fires that could result from arc-faults, whereas the GFCI receptacle protects people from potentially hazardous shocks and electrocution. Additionally, GFCI receptacles are required in wet or damp locations such as kitchens, bathrooms, basements, laundry rooms and garages. AFCI receptacles are often required in family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets and hallways.

Posted in Safety Products By Leviton Product Support

How to install Floor Heating

2016-06-04 1:51:52 AM

Floor Heating and Snow Melting for Professionals 

Danfoss is the leading manufacturer of intelligent electric floor heating systems and outdoor systems for ice and snow melting.
 
This position is secured by a dedicated focus on advanced and above all user friendly systems, developed in the world’s largest competence center for floor heating. 

Read More
Posted in Heating & Cooling By Danfoss Sales Rep

Intermatic ET2000 Series

You must purchase a new ET2000 series control. Your free ET2000 series control will be of equal or lesser value. Limited to one unit per customer (Electrical Firm). Proof of purchase will be required - copy of paid receipt. Contractor must complete online survey by September 1, 2016. Promotion dates April 1 - June 30, 2016. Allow 4 - 6 weeks for processing and shipping of new product. While supplies last. Contractor must agree to receive marketing messages from Intermatic. Contractor's name or picture may be used in marketing or advertising. See go.intermatic.com/et2000x2 for full details.

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Posted in News & Promotions By Intermatic Sales

The IP Rating System

2016-03-04 12:57:00 AM

The IP rating system

  • IP stands for Ingress Protection
  • The rating’s first digit e.g. IP65 relates to the ingress protection against dust (6 means dust tight, see the table below)
  • The second digit e.g. IP65 relates to the ingress protection against water (5 means protected against water jets, see the table below)
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Posted in Fixture Fundamentals By Lighting Fixture Support Team

Coupons & Promotion - Bulbspro.com

2016-02-28 3:55:47 AM

Since 2015, Bulbspro.com has tried to send weekly coupons and promotion discount flyers in a easy way. We invite and encourage our existing customers and potential customers to subscribe our weekly discount flyers. 

Weekly Coupons & Promotions from Bulbspro.com

Coupons & Promotions Bulbspro.com

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Posted in News & Promotions By Discount Coupons & Promotions Management

The Job of a Ballast

Starting Methods:

  • Instant Start Electronic Ballasts
  • Rapid Start Electronic Ballasts
  • Programmed Start Electronic Ballasts
Read More
Posted in Ballast & LED Driver By Ballast Support Team

Fulham Ballast Chart for 2D / 2-D / Butterfly CFL Bulbs.

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Posted in Bulbs & Tubes By Fulham Ballast Expert
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