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Monthly Archive for: «July, 2013»

Talking about HV shunt reactor switching (part 2)

Continued from first part: Talking About HV Shunt Reactor Switching (part 1) Scope (explained in previous part) Shunt reactors application (explained in previous part) Closing operation (explained in previous part) Opening operation Conclusions In the… Read more

Jul 31, 2013 | Nicola

Talking about HV shunt reactor switching (part 2)

Talking about HV shunt reactor switching (1)

These notes aim to give basic idea of the main criticalities related to HV shunt reactor switching, particularly in terms of voltage, and how such problems are faced and solved by modern switching technology. Content:… Read more

Jul 29, 2013 | Nicola

Talking about HV shunt reactor switching

Selection Of Crane Duty Motors (Part 3)

Continued from second part: Selection Of Crane Duty Motors (Part 2) N = Duration of motor operation under rated conditions R = Duration of motor at rest and de-energised ØMax = Maximum temperature attained during… Read more

Jul 27, 2013 | Ashok Parikh

Selection Of Crane Duty Motors

Equipotential Bonding For Metal Installations

The electrical low voltage consumer’s installation requiring certain earthing resistances (disconnection conditions of the protective elements) and the foundation earth electrode providing good earthing resistances at cost-effective installation, the foundation earth electrode is an optimal… Read more

Jul 26, 2013 | Edvard

Equipotential Bonding For Metal Installations

Selection Of Crane Duty Motors (Part 2)

Continued from first part: Selection Of Crane Duty Motors (Part 1) Following two types of motors are widely used for crane duty applications. Squirrel Cage Crane Duty Motors Slip ring and Wound Rotor Crane Duty… Read more

Jul 24, 2013 | Ashok Parikh

Selection Of Crane Duty Motors (Part 2)

Selection Of Crane Duty Motors (Part 1)

The operating conditions such as duty cycle, startup, temperature and operating environment are vital considerations in the motor efficiency and reliability. It is absolutely essential to match the motors to their specified operating conditions for… Read more

Jul 22, 2013 | Ashok Parikh

Selection Of Crane Duty Motors

NEC Branch Circuit Requirements

The National Electrical Code (NEC 2011) provides guidance for electrical contractors and electricians, but it is really intended for use by governmental agencies that have legal jurisdiction over electrical installations and authorized electrical and insurance… Read more

Jul 15, 2013 | Edvard

NEC Branch Circuit Requirements

What is the rewind scenario if a motor fails?

Unlike an initial motor purchase where your decision is limited to procuring a standard versus a premium efficiency motor, a motor failure or burnout produces three alternatives. Your options are to rewind the failed motor,… Read more

Jul 10, 2013 | Edvard

What is the rewind scenario if a motor fails?

A Few Words About Battery Hazards and Why They Happen

Because batteries store large amounts of energy, there are certain hazards that are associated with battery operation. These hazards must be fully understood to ensure safe operation of batteries. Cell short circuits can be caused… Read more

Jul 03, 2013 | Edvard

A Few Words About Battery Hazards and Why They Happen

Voltage Distribution In a Suspension Insulator Strain

A suspension insulator strain consists of a series of alternately insulators and metal parts, which bind each insulator to the next. This constitutes a series of connected capacitors, with each one’s capacitance being created by… Read more

Jul 01, 2013 | Emmanouil Angeladas

Voltage Distribution In a Suspension Insulator Strain


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