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Inspection and test procedures for Rotating Machinery, Synchronous Motors and...
Inspection and test procedures of Rotating Machinery, Synchronous Motors and Generators (On photo: Small machine test set – ee.polyu.edu.hk)Procedures (Index) Visual and Mechanical InspectionElectrical...
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Physical Structure & Configuration of DC Machines
Physical structure and configuration of DC MachinesTwo-pole machineFigure 1 depicts a two-pole machine in which the stator poles are constructed in such a way as to project closer to the rotor than to...
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Practices for grounding and bonding of cable trays
Grounding and bonding of cable trays (on photo: Ground wire connected to cable tray; photo credit: solarprofessional.com)Metallic Cable TraysCable tray may be used as the Equipment Grounding Conductor...
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Testing Procedures for HV Voltage Transformers
Testing Procedures for HV Voltage Transformers (photo credit: hvcafrica.com)Content:Equipment required for testingGeneral inspectionInsulation Resistance TestPolarity TestTransformer Turns ratio test...
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Total Losses in Power Distribution and Transmission Lines (2)
Total Losses in Power Distribution and Transmission Lines (Photo taken my Michael Kappel) Continued from first part: Total Losses in Power Distribution & Transmission Lines (1)There are two types...
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Peak Value of Deadly Lightning Current
Peak Value of Deadly Lightning Current (photo credit: William via Flickr)Lightning DischargeLightning currents are load-independent currents, i.e. a lightning discharge can be considered an almost...
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Motor Starting via Chokes or Resistors
Motor Starting via Chokes or ResistorsReducing the voltage and starting currentThe series-connected chokes (Figure 1) or resistors (Figure 2) reduce the voltage at the motor and hence also the starting...
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Electrical Thumb Rules You MUST Follow (Part 8)
Electrical Thumb Rules You MUST Follow (Part 8) Continued from part 7: Electrical Thumb Rules You MUST Follow (Part 7) Three EE thumb rules to follow:Accuracy Class of Metering CTAccuracy Class Letter...
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Testing of power transformer – Measurement of impedance voltage and load loss
Figure 4.1 – Circuit for the impedance and load-loss measurementPurpose of the measurementThe measurement is carried out to determine the load-losses of the transformer and the impedanse voltage at...
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Location of Current Transformers in HV Substation
Siemens High Voltage Instrument TransformersPower flowCurrent transformers are used for protection, instrumentation, metering and control. It is only the first function that has any bearing on the...
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Let’s start learning the PLC programming
Let’s start learning the PLC programmingIntroductionFor managing and control of the electrical systems there once were used electromechanical relays. In time as tehnology advanced came and PLC devices...
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Hey Mom, look at that big HVDC Transformer!
SIEMENS – www.siemens.com/press – 800,000 volt transformer for high-voltage direct current transmission. The core of the system are ten transformers for voltage of 800 kV. They are each as large as a...
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Electrical Design Project of a Three Bed Room House (Part 1)
Electrical design project of a three bed room house (Part 1)Requirements and StandardsElectrical design is not an easy task. It requires a lot of expertise. Detailed study is needed prior to...
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Underfloor Cable Systems
Underfloor Cable Systems (on photo: Obo Betermann underfloor cable trunking – screed-covered duct systems)Power distributionIt should be understood that the generic term ‘underfloor’ applies to...
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Enclosure protection against ingress of solid objects and liquids
Enclosure protection against ingress of solid objects and liquids (photo credit: koehl.eu)Enclosure protection (IP) codeAs you already probably know, IP stands for Ingress Protection. International...
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PLC implementation of the bottle-filling application
PLC implementation of the bottle-filling application (photo credit: aircontrolindustries.com)Detection of positionIn this example (see Figure 1), we will implement a control program that detects the...
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Electrical Design Project of a Three Bed Room House (Part 2)
Electrical Design Project of a Three Bed Room House (Part 2) Continued from 1st part: Electrical Design Project of a Three Bed Room House (Part 1) Building regulationsSmoke detectorsAll new domestic...
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Electromagnetic Stresses On Busbar System
Electromagnetic Stresses On Busbar System (photo credit: teknomega.com)IntroductionWhen a conductor carries a current it creates a magnetic field which interacts with any other magnetic field present...
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Inspection and Test procedures for Instrument Transformers
Inspection and Test procedures for Instrument Transformers (on photo: Ritz Instrument Transformers)Procedures to follow: Visual and Mechanical InspectionElectrical Tests:Electrical Tests – Current...
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Erection Procedures of Earthing Arrangements (TNC, TN-S, TNC-S and TT)
Erection Procedures of Earthing Arrangements: TNC, TN-S, TNC-S and TT (original photo by aeconline.ae)Earthing of low voltage networksThe earthing of low voltage networks in the UK is largely...
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