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)… Read more

Jul 31, 2013 | Nicola

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… Read more

Jul 29, 2013 | Nicola

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… Read more

Jul 27, 2013 | Ashok Parikh

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… Read more

Jul 26, 2013 | Edvard

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… Read more

Jul 24, 2013 | Ashok Parikh

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… Read more

Jul 22, 2013 | Ashok Parikh

Micro Hydro Power Plant With Automatic Frequency and Excitation Control

First of all, I am very glad to say that our project was successful. It is hydro power plant which was completed totally by our five members team namely me,… Read more

Jul 19, 2013 | Aakash Johari

Commissioning of HV Panel – Operational and Functional Checkup

The main objective of the test is to check the proper operation function of the circuit breaker; in this test we do the following: This test is conducted by manual,… Read more

Jul 17, 2013 | Edvard

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… Read more

Jul 15, 2013 | Edvard

Calculation Example of Small Photovoltaic (PV) Residential Stand-Alone System

– Array Size: 10, 12-volt, 51-watt modules; Isc= 3.25 amps, Voc= 20.7 volts – Batteries: 800 amp-hours at 12 volts – Loads: 5 amps DC and 500-watt inverterwith 90% efficiency…. Read more

Jul 12, 2013 | Edvard

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… Read more

Jul 10, 2013 | Edvard

Development of a Sine-Wave Output In AC Generator

The elementary AC generator (Figure 1) consists of a conductor, or loop of wire in a magnetic field that is produced by an electromagnet. The two ends of the loop are… Read more

Jul 08, 2013 | Edvard

Keeping Motor At Correct Temperature When Connected To a Frequency Converter

When a motor is connected to a frequency converter it must be kept at the correct temperature, and this is subject to two types of influence: If the speed decreases,… Read more

Jul 05, 2013 | Edvard

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… Read more

Jul 03, 2013 | Edvard

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… Read more

Jul 01, 2013 | Emmanouil Angeladas