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Introduction to instrument transformers

via Edvard — Wed, 16 May 2012 20:55:02 +0000

Instrument transformers – ABBInstrument transformers (ITs) are designed to transform voltage of current from the high values in the transmission and distribution systems to the low values that can be utilized by low voltage metering devices. There are three primary applications for which ITs are used: metering (for energy billing and transaction purposes); protection control (for system protection and protective relaying purposes); and load survey (for economic management of industrial … [visit site to read more]

Please read the whole article at the Electrical Engineering Portal

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Power Measurement In AC Circuits

via Edvard — Wed, 16 May 2012 20:54:59 +0000

Power Measurement In AC Circuits

GE Watthour MeterPower measurement in AC circuits can be quite a bit more complex than with DC circuits for the simple reason that phase shift complicates the matter beyond multiplying voltage by current figures obtained with meters.What is needed is an instrument able to determine the product (multiplication) of instantaneous voltage and current. Fortunately, the common electrodynamometer movement with its stationary and moving coil does a fine job of this.Three phase power measurement … [visit site to read more]

Please read the whole article at the Electrical Engineering Portal

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Why You Need an Uninterruptible Power Supply

dave manney — Wed, 16 May 2012 19:12:19 +0000

Why You Need an Uninterruptible Power Supply

Many people would agree that a power loss in their home is an inconvenience. But for businesses, a power loss can be disastrous; it leads to downtime where a business is … [visit site to read more]

WATTS NEW - The official blog for L&S Electric.com

Transformer Repair

dave manney — Wed, 16 May 2012 17:39:26 +0000

Transformer Repair

The need for transformer repair

Transformers are normally varied in sizes and they are the heart of all the power systems. Due to the fact that they are … [visit site to read more]

WATTS NEW - The official blog for L&S Electric.com

Tip: Root Cause Analysis – keep an ear out

dave manney — Wed, 16 May 2012 16:15:56 +0000

Tip: Root Cause Analysis – keep an ear out

Here’s a tip from Reliability Web:

When it comes to looking for failures during a Reliability Study or for causes during a Root Cause Analysis investigation, ‘Listen to your operators’.

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WATTS NEW - The official blog for L&S Electric.com

Finding Rebates & Incentives for VFDs

dave manney — Tue, 15 May 2012 16:42:25 +0000

Finding Rebates & Incentives for VFDs

One of the greatest benefits variable frequency drives (VFDs) offer is the ability to save you money by running your equipment in a most efficient manner. There are, however, additional benefits, such as receiving incentives or rebates from federal, state, and local agencies.

In an article* entitled, “No hot air about VFDs,” Kay Dekker, from Yaskawa Electric America, writes about locating and applying for those incentives.

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WATTS NEW - The official blog for L&S Electric.com

Bearing Lubrication

dave manney — Mon, 14 May 2012 21:02:20 +0000

Bearing Lubrication

Bearing lubrication is the act of applying a lubricant on the surface between the rolling bearings parts ant the metal surface. Lubrication seeks to reduce direct contact between the rolling and the sliding surfaces. When applied, the lubricant separates the two surfaces, reducing friction.

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WATTS NEW - The official blog for L&S Electric.com

Sizing of power cables for circuit breaker controlled feeders (part 2)

via Edvard — Sun, 13 May 2012 21:07:01 +0000

Sizing of power cables for circuit breaker controlled feeders (part 2)

Sizing of power cables for circuit breaker controlled feeders (part 2) Continued from article Sizing of power cables for circuit breaker controlled feeders (part 1) 2. Criteria-2 Continuous current capacity (Ampacity)This criterion is applied so that cross section of the cable can carry the required load current continuously at the designed ambient temperature and laying condition. Ampacity is defined as the current in amperes a conductor can carry continuously under the conditions of … [visit site to read more]

Please read the whole article at the Electrical Engineering Portal

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Question from the Field: Maintenance Ready Backlog

via Reliability Now — Sat, 12 May 2012 11:36:10 +0000

Question from the Field: Maintenance Ready Backlog

So what is maintenance ready backlog, … [visit site to read more]

Please read the whole article at the Reliability Now Blog

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Sizing of power cables for circuit breaker controlled feeders (part 1)

via Edvard — Sat, 12 May 2012 11:36:05 +0000

Sizing of power cables for circuit breaker controlled feeders (part 1)

Low voltage switchboard with circuit breakers (incomers, feeders) The following three criteria apply for the sizing of cables for circuit breaker controlled feeders:I. Short circuit current withstand capacityThis criteria is applied to determine the minimum cross section area of the cable, so that cable can withstand the short circuit current.Failure to check the conductor size for short-circuit heating could result in permanent damage to the cable insulation and could also result into fire. … [visit site to read more]

Please read the whole article at the Electrical Engineering Portal

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