Tig Welding Theory

tig welding theory

Have you ever wondered why some powers is expressed in watts, some amps, some in volts, and some in KVA? For many in the industry accommodation that can be a very confusing. Let's face it, business professionals content are probably not electrical engineers, electrical engineers, and most know nothing of the content creation and delivery.

This article explains in simple terms the difference between ratings great power, and describe where each must be used in planning their network architecture.

According to APC, the main difference between watts and volt amps power draw is determined by the energy from a real source of energy and heat generated by the equipment. The VA rating is used for sizing equipment such as switches, wiring, and UPS. The VA rating is usually equal to or greater than the number of watts, since it includes the power factor "in its calculation.

Power factors

The power factor is a calculation used to account for the difference in power used to convert alternating current into direct current for use in devices hardware and appliances. There are two types of power supplies – capacitor input supply and power factor corrected supply.

Factor corrected power supplies used in high-end computing and switching equipment, and a proportion of 1VA: 1W – for a very simple calculation to expand Electric and UPS. Thus, in theory, if the power factor is 1:1, and the UPS is a UPS 80kVA, it would be able to load the inverter and 100% of its index.

Major appliances and lowest and equipment video using power supply input capacitor and a power factor from.55 to.75 any time the value of VA.

Normally, when the scale of an inverter for use in a data center using a load factor of 60% of the UPS. If you overload a UPS is almost certain that there is a blackout, according to the draw for the batteries exceed the capacity of the UPS. Most UPS comes automatically bypass the battery when an overload situation. 60% load factor accounts for the strong likelihood that most of the teams energy consumed by the inverter is in a category that has a power factor and.75 between.55.

Example 1

You have a UPS 10KVA. Your data center has racks of low-end self-assembled computers with an estimated total score of 9,000 watts. Your UPS what to do, as the power factor probably around.70. You need at least enough 12.85KVA backup data center.

Example 2

You have 10KVA UPS. Your data center is a low-end self-assembled teams with a total score estimated 6,000 watts. Your UPS will be able to handle the load factor power, corrected notes need about 8.5KVA UPS.

Some modern UPS allows you to know the power factor and the average time capacity actual load of the inverter.

Some useful conversion factors

or cooling

– 1 watt =. 86 kcal / h

– 1 watt = 3.412 Btu / h

– 1 watt = 2.843 x 10-4 tons

– 1 ton = 200 Btu / min

– 1 ton = 12,000 BTU / h

– 1 ton = 3517.2 W

Conversion or kVA


kVA = V i? – A i Sieur? – Sieur √ 3 / Sieur 1000


kVA = V i? – Sieur A / Sieur 1000


kVA = Voltage x Current (amps)

Watts = VA x PF

BTU = Watts x 3.41

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