National Fire Alarm Code Defined By NFPA 72
NFPA 72 is the National Fire Alarm Code. The importance of installing smoke and fire alarms in homes is supported by results from exhaustive investigations of home fires indicating that… Read more
Aug 16, 2013 | By Edvard Csanyi
An Overview of IEC 60076-10 – Determination Of Sound Levels Of Power Transformers
The audible sound radiated by transformers is generated by a combination of magnetostrictive deformation of the core and electromagnetic forces in the windings, tank walls and magnetic shields. Historically, the… Read more
Aug 14, 2013 | By Edvard Csanyi
Jet pumps used for private well systems or low flow irrigation applications
Jet Pumps are mounted above ground and lift the water out of the ground through a suction pipe. Jets are popular in areas with high water tables and warmer climates…. Read more
Aug 12, 2013 | By Edvard Csanyi
7 Most Common Motor Enclosure Types Defined By NEMA Standards
The enclosure of the motor must protect the windings, bearings, and other mechanical parts from moisture, chemicals, mechanical damage and abrasion from grit. NEMA standards MG1-1.25 through 1.27 define more… Read more
Aug 09, 2013 | By Edvard Csanyi
Motor Service Factor (SF) Defined By NEMA
Motor Service Factor (SF) is the percentage of overloading the motor can handle for short periods when operating normally within the correct voltage tolerances. This is practical as it gives… Read more
Aug 07, 2013 | By Edvard Csanyi
Where do the strongest electric and magnetic fields come from in a power substation?
Electric substations produce electric and magnetic fields. In a substation, the strongest fields around the perimeter fence come from the transmission and distribution lines entering and leaving the substation. The… Read more
Aug 05, 2013 | By Edvard Csanyi
NEMA Definition Of Motor Full Load Nominal Efficency (Standard MG1-12.54.2)
Efficiency is defined as the ratio of the power output divided by the power input. Machine losses are in the form of heat, and include: Stator winding loss, Rotor loss,… Read more
Aug 02, 2013 | By Edvard Csanyi
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 | By 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 | By 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 | By 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 | By Edvard Csanyi
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 | By 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 | By 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 | By 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 | By Edvard Csanyi