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Monthly Archive for: «April, 2012»

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 perform either on-delay or off-delay… Read more

Apr 30, 2012 | Edvard

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

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 4. IR Value for Electric… Read more

Apr 29, 2012 | jiguparmar

Fluke insulation resistance tester up to 10kV

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 customer acceptance test, with minimum… Read more

Apr 28, 2012 | 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

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 adequate power capacity with proper… Read more

Apr 27, 2012 | Edvard

Low voltage switchgear type 'OKKEN' - Schneider Electric

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 accumulation of dirtiness in lamps,… Read more

Apr 24, 2012 | Edvard

Dirty surface of the fluoroscent lamp

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 flow, we employ different types… Read more

Apr 22, 2012 | jiguparmar

Direct Online Motor Starter - Square D

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 of heating the transformer? Responsible… Read more

Apr 20, 2012 | Edvard

What is the best transformer coolant?

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. Transducers also isolate and buffer… Read more

Apr 19, 2012 | Edvard

Current transducer

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 carrying capacity it is simply… Read more

Apr 15, 2012 | Edvard

Inspection Of Voltage Drop In Conductors

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 the worker to the flash… Read more

Apr 13, 2012 | Edvard

Arc flash in switchboard

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 and sophisticated systems and equipment… Read more

Apr 12, 2012 | Edvard

Key Cyber Security Purposes for the Smart Grid

Star-delta motor starter explained in details

Most induction motors are started directly on line, but when very large motors are started that way, they cause a disturbance of voltage on the supply lines due to large starting current surges. To limit… Read more

Apr 10, 2012 | jiguparmar

Star-delta motor starter panel

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 resistance, a voltage drop is… Read more

Apr 08, 2012 | Edvard

Figure 1 - Perfect resistor, inductor and capacitor

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