Energy and Power
Rogowski Coil Construction
Figure 1 shows the construction of a Rogowski coil, an air-core current transformer that is especially well suited to measuring ripple currents in the presence of a DC component or… Read more
Dec 13, 2012 | By Edvard
High Voltage
HV Instrument Current Transformers in T&D
Electrical measurements on a high-voltage transmission and distribution systems cannot be made practically or safely with direct contact to the power carrying conductors. Instead, the voltages and currents must be… Read more
Nov 23, 2012 | By Edvard
Energy and Power
Overview of Single Phase Induction Type Energy Meter
Single phase induction type energy meter is also popularly known as watt-hour meter. This name is given to it. This article is only focused about its constructional features and its… Read more
Sep 28, 2012 | By Bipul Raman
Metering
Analog signals in measurement and control of physical processes
Instrumentation is a field of study and work centering on measurement and control of physical processes. These physical processes include pressure, temperature, flow rate, and chemical consistency. An instrument is… Read more
Sep 13, 2012 | By Edvard
Cables
Locating underground electrical cable faults
Before attempting to locate underground cable faults on direct buried primary cable, it is necessary to know where the cable is located and what route it takes. If the fault… Read more
Jul 13, 2012 | By Edvard
Electrical Lectures
Power Measurement In AC Circuits
Power 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… Read more
May 15, 2012 | By Edvard
Metering
An Overview Of Clamp Meter
Clamp-on ammeter or simply ‘clamp meter’ is an instrument that is used to measure the current flowing through a conductor. An AC Clamp meter basically consists of a current transformer… Read more
May 06, 2012 | By S
Cables
Measurement of insulation resistance (IR)
The measurement of insulation resistance is a common routine test performed on all types of electrical wires and cables. As a production test, this test is often used as a… Read more
Apr 28, 2012 | By jiguparmar
Metering
Analog Data Acquisition with Transducers
Transducers measure power system parameters by sampling instrument transformer secondaries. They provide a scaled, low-energy signal that represents a power system quantity that the SA interface controller can easily accept…. Read more
Apr 19, 2012 | By Edvard
Metering
Voltage Instrument Transformer (VT) – Introduction
Instrument transformers are primarily used to provide isolation between the main primary circuit and the secondary control and measuring devices. This isolation is achieved by magnetically coupling the two circuits…. Read more
Feb 20, 2012 | By Edvard
Energy and Power
Moving Iron Instruments – Voltmeter and Ammeter
Moving-iron instruments are generally used to measure alternating voltages and currents. In moving-iron instruments the movable system consists of one or more pieces of specially-shaped soft iron, which are so… Read more
Nov 13, 2011 | By Bipul Raman
Metering
D’Arsonval Meter Movement
The most commonly used sensing mechanism used in DC ammeters, voltmeters, and ohm meters is a current-sensing device called a D’Arsonval meter movement (Figure 1). The D’Arsonval movement is a… Read more
Mar 08, 2011 | By Edvard
Metering
How To Use A Digital Multimeter
A digital multimeter is used to make various electrical measurements, such as AC and DC voltage, AC and DC current, and resistance. It is called a multimeter because it combines… Read more
Feb 23, 2011 | By Edvard
Electronics
Ethernet History
Ethernet is the most popular and widely deployed network technology in the world. In 1973, while working on a way to link the Xerox “Alto” computer to a printer, Bob… Read more
Jan 25, 2011 | By Edvard
Energy and Power
Economic advantages of power factor correction
Power supply authorities apply a tariff system which imposes penalties on the drawing of energy with a monthly average power factor lower than 0.9. The contracts applied are different from… Read more
Dec 04, 2010 | By Edvard
