Testing and Commissioning
Condition Monitoring of Transformers
It is possible to provide transformers with measuring devices to detect early signs of degradation in various components and provide warning to the operator in order to avoid a lengthy and expensive outage due to failure. The technique, which can… Read more
May 24, 2013 | By Edvard Csanyi
Testing and Commissioning
Transformer Routine Dielectric (Insulation) Test
The following insulation tests are performed in order to meet the transformer insulation strength expectations. Unless otherwise requested by the customer, the following test are performed in the following order (IEC 60076-3) : To confirm the insulation of the transformer terminals… Read more
May 23, 2013 | By Edvard Csanyi
Energy and Power
Are you concerned about your privacy in Smart Grid?
Modernization of the grid will increase the level of personal information detail available as well as the instances of collection, use and disclosure of personal information. Instead of measuring energy use at the end of each billing period, smart meters… Read more
May 22, 2013 | By Edvard Csanyi
Testing and Commissioning
Erection Procedure for Power Transformer
This technical article deals with transformers and their installation so we restrict ourselves here to the procedures associated with their commissioning. Transformers should be inspected for internal or external damage, particularly if they have been dropped or tipped over. This should include such… Read more
May 20, 2013 | By Edvard Csanyi
Industrial Automation
Requirements and Functions of Substation Automation
Substation automation is the cutting edge technology in electrical engineering. It means having an intelligent, interactive power distribution network including : Increased performance and reliability of electrical protection. Advanced disturbance and event recording capabilities, aiding in detailed electrical fault analysis…. Read more
May 17, 2013 | By Edvard Csanyi
Energy and Power
Switching contactor and effect of long control lines
In accordance with IEC 60947-4-1 and IEC 60947-5-1, the normal control voltage range of power and control contactors lies between 85 … 110 % of the rated control voltage. Within these limits contactors pull-in perfectly. Frequently contactors are offered with… Read more
May 15, 2013 | By Edvard Csanyi
Energy and Power
How to Determine Correct Number of Earthing Electrodes (Strips, Plates and Pipes) – part 2
Continued from first part: How to Determine Correct Number of Earthing Electrodes (Strips, Plates and Pipes) – part 1 The Earth Resistance of Single Plate electrode is calculated as per IS 3040: R=ρ/A√(3.14/A) Where: ρ = Resistivity of Soil (Ω… Read more
May 13, 2013 | By Jignesh Parmar
Energy and Power
Ferroresonance Occurrence In Power Transformer
Ferroresonance occurs when line capacitance resonates with the magnetizing reactance of a core while it goes in and out of saturation. Ferroresonance is usually associated with potential transformers, which are instrument transformers that are used to develop voltages used by… Read more
May 10, 2013 | By Edvard Csanyi
Testing and Commissioning
When a transformer has stomach pain and wants to…
During normal operation, transformer internal structures and windings are subjected to mechanical forces due to the magnetic forces. These forces are illustrated in Figure 1. By designing the internal structure very strong to withstand these forces over a long period of… Read more
May 08, 2013 | By Edvard Csanyi
Electric Motor
Selection of Induction Motors for Industrial Applications (part 3)
Continued from first part: Selection of Induction Motors for Industrial Applications (part 2) The different rotor class, i.e. KL7, KL10, KL13, KL16, KLp, etc. are available in case of the motor to fulfil the functional torque requirements of the driven… Read more
May 06, 2013 | By Ashok Parikh
Electric Motor
Selection of Induction Motors for Industrial Applications (part 2)
Continued from first part: Selection of Induction Motors for Industrial Applications (part 1) Though standard motors are now available with a better efficiency, this factor (motor efficency) requires due attention when making the selection of the motor for a specific… Read more
May 04, 2013 | By Ashok Parikh
Electric Motor
Selection of Induction Motors for Industrial Applications (part 1)
All types of industries are invariably required to install different types of electric motors as prime mover for driving process equipment participating in their respective production line up. The continuous process of technical development has resulted into availability of highly… Read more
May 03, 2013 | By Ashok Parikh
High Voltage
Erection procedure for HV switchgear (Part 2)
Continued from first part: Erection procedure for HV switchgear (Part 1) Positioning of the cubicles should start near to the centre of the switchboard, installing as early as possible the enclosures associated with any special chambers or trunking. The first… Read more
May 01, 2013 | By Edvard Csanyi
High Voltage
Erection procedure for HV switchgear (Part 1)
Before commencing erection of HV switchgear check that all connections are tight on busbars and on main circuits as well as auxiliary circuits. Examine the insulation very carefully, because there have been reported cases of burned out connections due to… Read more
Apr 29, 2013 | By Edvard Csanyi
Energy and Power
Why Lamp Flickers Sometimes
Voltage regulation has been one of the most important problems of the electric industry since its inception. The sizes of many parts of a power system are determined largely by this one consideration alone. Large proportion of the selling price of electrical power… Read more
Apr 27, 2013 | By Edvard Csanyi
