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Archive: Category «Metering»

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

HV Instrument Current Transformers in Transmission and Distribution Systems
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

GE Watthour Meter
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

Clapm meter
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

Megger MIT1020 10-kV insulation resistance testers are all designed specifically to assist the user with the testing and maintenance of high voltage equipment
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

Current transducer
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

Voltage Transformer (VT) - Introduction And Purpose
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

Analog ammeter and voltmeter designed to measure a.c. current and a.c. voltage
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

Figure 1 - D’Arsonval Meter Movement
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

How to use digital multimeter
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

Ethernet Plug
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

Economic advantages of power factor correction
Metering

Megger Tests

The insulation resistance meter test method for determining the condition of electrical insulation has been widely used for many years as a general nondestructive test method. A serious limitation of… Read more

Nov 26, 2010 | By Edvard

Megger


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