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Monthly Archive for: «April, 2012»

Energy and Power

Time relays setting ranges explained in details

Time relays are used in control switching operations involving time delay. Most of these time relays have multiple time setting ranges and most of them are explained below. Time relays… Read more

Apr 30, 2012 | By Edvard

Siemens SIRIUS 3RP25 timing relay with microprocessor, OFF delay without auxiliary voltage, fully cover the functionality of the predecessor types on ASIC basis
Maintenance

Measurement of insulation resistance (IR) – 2

Continued from first part: Measurement of insulation resistance (IR) – Part 1 1. IR Values For Electrical Apparatus & Systems 2. IR Value for Transformer 3. IR Value for Tap Changer… Read more

Apr 29, 2012 | By jiguparmar

Fluke insulation resistance tester up to 10kV
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
Energy and Power

Overview Of Electrical Loads In Building

The electrical design professional should determine a building’s electrical load characteristics early in the preliminary design stage of the building to select the proper power distribution system and equipment having… Read more

Apr 27, 2012 | By Edvard

Low voltage switchgear type 'OKKEN' - Schneider Electric
Lighting

Light Emission Depreciation

Illuminance provided initially by a lighting installation will decrease in a gradual way during its use due to a reduction in lamp lumens, to lamps which burn down, and to… Read more

Apr 24, 2012 | By Edvard

Dirty surface of the fluoroscent lamp
Electric Motor

Direct On Line (DOL) Motor Starter

Different starting methods are employed for starting induction motors because Induction Motor draws more starting current during starting. To prevent damage to the windings due to the high starting current… Read more

Apr 22, 2012 | By jiguparmar

Direct Online Motor Starter - Square D
Transformers

What is the best transformer coolant?

One of the main sources of losses and reasons for temperature rise in various parts of a transformer are the magnetic circuit and windings. So what are the actually reasons… Read more

Apr 20, 2012 | By Edvard

What is the best transformer coolant?
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
Electrical Lectures

Inspection Of Voltage Drop In Conductors

It is part of the inspection process to ensure that installed conductors have been correctly selected for current carrying capacity and voltage drop. To check the suitability of the current… Read more

Apr 15, 2012 | By Edvard

Inspection Of Voltage Drop In Conductors
Electrical Lectures

What is incident energy caused by arc flash?

Incident energy is the energy per unit area received on a surface located a working distance away from the arc flash location. The working distance is the distance from where… Read more

Apr 13, 2012 | By Edvard

Arc flash in switchboard
Energy and Power

Key Cyber Security Purposes for the Smart Grid

In the Smart Grid, there are two key purposes for cyber security: Keep electricity flowing to customers, businesses, and industry. For decades, the power system industry has been developing extensive… Read more

Apr 12, 2012 | By Edvard

Key Cyber Security Purposes for the Smart Grid
Electrical Lectures

Short review of resistance, reactance and impedance

Resistance is essentially friction against the motion of electrons. It is present in all conductors to some extent (except superconductors!), most notably in resistors. When alternating current goes through a… Read more

Apr 08, 2012 | By Edvard

Figure 1 - Perfect resistor, inductor and capacitor


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