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Field Inspection and Testing of Medium-Voltage Motor Control Centres (MCCs)
Field Inspection and Testing of Medium-Voltage Motor Control Centres - MCCs (Photo by Arrow Speed Controls; arrowspeed.com // MX3 Medium Voltage Solid State Soft-Starter)Equipment and Installation...
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Power Transformer Turns Ratio Test
Power Transformer Turns Ratio TestTurns ratio between the windingsThe turns ratio test is an AC low voltage test which determines the ratio of the high voltage winding to all other windings at no-load....
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Power Transformer Capacitance and Dissipation Factor Test
Figure 1 – Capacitance and Dissipation Factor Test connection diagramTransformer insulation systemThe capacitance and dissipation factor test is an AC low voltage maintenance test and is very similar...
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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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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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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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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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How to measure insulation resistance of a motor
How to measure insulation resistance of a motor (photo credit: elecls.cc.oita-u.ac.jp)Winding insulation resistanceIf the motor is not put into operation immediately upon arrival, it is important to...
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Why is Continuous On-line Monitoring of Partial Discharge in the Switchgear...
Why is Continuous On-line Monitoring Partial Discharge in the Switchgear Necessary? (on photo: 11kV voltage transfromer spout failure in progress – Located by Partial Discharge survey; by...
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Testing of Power Transformer – Measurement of Zero-Sequence Impedance
Testing of Power Transformer – Measurement of Zero-Sequence Impedance (on photo: preparing the 400 kV transformer for the test field inside the ABB’s factory)Earth-fault protectionPurpose of the...
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Transformer Routine Test – Partial Discharge Measurement
Transformer Routine Test – Partial Discharge Measurement (on photo: OSB Power Transformers Test Laboratory by BEST Transformers)Transformer insulation structureThis routine test aims to measure the...
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Test On 110kV Power Cable After Installation (1)
Test On 110kV Power Cable After Installation – Part 1 (on photo: Kyoritsu 4102A digital earth resistance tester)General description of site test procedureSite test procedure covers all necessary...
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Test On 110kV Power Cable After Installation (2)
Test On 110kV Power Cable After Installation (Part 2)General description of site test procedureIn previous part of this technical article first three procedures were explained. Now the rest will be...
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Test On 110kV Power Cable After Installation (3)
Test On 110kV Power Cable After Installation (Part 3)General description of site test procedureIn previous two parts of this technical article first six procedures were explained. Now the last three...
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Inspection, Test and Measurement Procedures for LV and MV (up to 36kV)...
Inspection, Test and Measurement Procedures for LV and MV (up to 36kV) Switchgears (on photo” Eaton Cutler Hammer Magnum DS Switchgear Inspection, and Transformer Testing)Importance of checks and...
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Basic Transformer Routine Test – Measurement of Winding Resistances
Measurement of the transformer winding resistances (photo credit: colvininfrared.com)Purpose of the measurementThe resistance between all pairs of phase terminals of each transformer winding are...
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Do Not Energize Oil-Filled Transformer Without Performing These 15 Tests and...
Do Not Energize Oil-Filled Transformer Without Performing These 15 Tests and Checks! (on photo 3-core type oil-immersed rectifier transformer 380kV; via electric-power-transformers.com)Obligatory...
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Impulse withstand voltage test performed on assemblies
Impulse withstand voltage test performed on assemblies (on photo: Tests in the impulse current laboratory by DEHN)Rated impulse withstand voltageOnly optional in the past, the impulse test which allow...
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General Guidelines for Online Partial Discharge Testing of Power Cables
Suitable Cable Termination for online PD measurement as individual earth shield of each cable is connected to substation earth separately. Also heat shrink tubes can be seen over earth shieldsFaults in...
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