Energy and Power
Application of 4-pole Switchgear Devices
The majority of low-voltage switchgear is equipped with three contacts in the main circuit, which switch three-phase loads in all poles. In some applications switchgear with four main poles is… Read more
Oct 31, 2012 | By Edvard Csanyi
Energy and Power
Testing and Commissioning of Current Transformer
1. Objective 2. Test Equipment Required 3. Test procedures Mechanical Check and Visual Inspection Insulation Resistance Test Polarity Test Secondary/Loop Resistance Test Burden Test (optional test) Magnetization Curve Test (optional… Read more
Oct 19, 2012 | By Edvard Csanyi
Energy and Power
How to Protect Capacitor Banks?
Capacitor banks are used to compensate for reactive energy absorbed by electrical system loads, and sometimes to make up filters to reduce harmonic voltage. Their role is to improve the… Read more
Oct 05, 2012 | By Edvard Csanyi
Power Substation
Designing of HV Power Substation and Layout
Introduction Earthing and Bonding Substation Earthing Calculation Methodology (Earthing Materials) Layout of Substation Different Layouts for Substations (single busbar, mesh, 1 1/2 cb) Principle of Substation Layouts (spatial separation, maintenance zones) Components of… Read more
Oct 01, 2012 | By sprabakar22
Energy and Power
Inspection of Ground-Fault Protection Systems
This type of protection is defined by the NEC (National Electrical Code) to ensure protection against fire on electrical power installations. To ensure protection against fire: The NEC defines the… Read more
Sep 25, 2012 | By Edvard Csanyi
Energy and Power
What is the purpose of equipotential bonding?
Equipotential bonding is essentially an electrical connection maintaining various exposed conductive parts and extraneous conductive parts at substantially the same potential. An earthed equipotential zone is one within which exposed… Read more
Sep 20, 2012 | By Edvard Csanyi
Transformers
Purpose of Shielded Isolation Transformer
A shielded transformer is a two-winding transformer, usually delta–star connected and serves the following purposes: – Voltage transformation from the distribution voltage to the equipment’s utilization voltage. – Converting a 3-wire… Read more
Aug 29, 2012 | By Edvard Csanyi
Energy and Power
Delta-Star Transformer Connection Overview
In this type of connection, the primary connected in delta fashion while the secondary current is connected in star. The main use of this connection is to step up the… Read more
Jul 10, 2012 | By jiguparmar
Technical Guide/Paper
Electrical network protection guide
Among their multiple purposes, protection devices: Contribute to protecting people against electrical hazards, Avoid damage to equipment (a three-phase short-circuit on medium-voltage busbars can melt up to 50 kg of… Read more
Jun 30, 2012 | By Edvard Csanyi
Transformers
ZigZag Transformer Connection Overview
The zigzag connection of tranformer is also called the interconnected star connection. This connection has some of the features of the Y and the ∆ connections, combining the advantages of… Read more
Jun 15, 2012 | By jiguparmar
Transformers
Scott-T Transformer Connection Overview
There are two main reasons for the need to transform from three phases to two phases: to give a supply to an existing two phase system from a three phase… Read more
Jun 12, 2012 | By jiguparmar
Transformers
Star-Delta Transformer Connection Overview
In this type of transformer connection, then primary is connected in star fashion while the secondary is connected in delta fashion as shown in the Figure 1 below. The voltages… Read more
Jun 10, 2012 | By jiguparmar
Energy and Power
Understanding Vector Group of Transformer (2)
Continued from first part Understanding Vector Group of Transformer (part 1) Vector Groups are the IEC method of categorizing the primary and secondary winding configurations of 3-phase transformers. Windings can… Read more
Jun 04, 2012 | By jiguparmar
Power Substation
Transformer Connection Star-Star
The windings of three phase transformers may be connected in by Y or Δ in the same manner as for three single phase transformer. Since the secondary’s may be connected either… Read more
May 23, 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 Csanyi
