Category Archive for: «Testing and Commissioning»

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Erection Procedures of Earthing Arrangements (TNC, TN-S, TNC-S and TT)

Earthing of low voltage networks The earthing of low voltage networks in the UK is largely determined by the Low Voltage Supplies. However, if the incoming supplies are at 11kV and the transformers are in the ownership of the user, the LV supplies may be earthed in a less conventional way using a high impedance. […]

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Inspection and Test procedures for Instrument Transformers

Procedures to follow: Visual and Mechanical Inspection Electrical Tests: Electrical Tests – Current Transformers Electrical Tests – Voltage Transformers Electrical Tests – Coupling-Capacitor Voltage Transformers Electrical Tests – High-Accuracy Instrument Transformers (Reserved) Test Values: Test Values: Visual and Mechanical Test Values: Current Transformers – Electrical Test Values:Voltage Transformers – Electrical Test Values: Coupling Capacitor Voltage […]

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Testing of power transformer – Measurement of impedance voltage and load loss

Purpose of the measurement The measurement is carried out to determine the load-losses of the transformer and the impedanse voltage at rated frequency and rated current. Apparatus and measuring circuit On Figure 1 above (Circuit for the impedance and load-loss measurement) there are following figures: G1 – Supply generator T1 – Step-up transformer T2 – […]

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Testing Procedures for HV Voltage Transformers

Content: Equipment required for testing General inspection Insulation Resistance Test Polarity Test Transformer Turns ratio test 1. Equipment required Following equipment is necessary to perform testings: Polarity test kit Megger 500-5000V Ohmmeter Multimeter Autotransformers & Step-up transformers Go up to the Content 2. General inspection Mechanical checks General visual inspection and compliance with the drawings […]

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Inspection and test procedures for Rotating Machinery, Synchronous Motors and Generators

Procedures (Index) Visual and Mechanical Inspection Electrical Tests Test Values Visual and Mechanical Tests Electrical Tests Pictures: Electrical machine wired for electrical testing The Electrical Machines Laboratory TABLE 100.10 – Maximum Allowable Vibration Amplitude TABLE 100.12 – US Standard Fasteners 1. Visual and Mechanical Inspection Compare equipment nameplate datawith drawings and specifications. Inspect physical and […]

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Power Transformer Capacitance and Dissipation Factor Test

Transformer insulation system The capacitance and dissipation factor test is an AC low voltage maintenance test and is very similar to the power factor test. While the transformer preparation is identical to the power factor test procedure, there is no requiremnts to make connection changes once the initial test set connections are made. High-voltage winding […]

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Power Transformer Turns Ratio Test

Turns ratio between the windings The 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. The turns ratio test is performed on all taps of every winding. Voltage is applied on the H marked leads and measured of the X […]

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Field Inspection and Testing of Medium-Voltage Motor Control Centres (MCCs)

Equipment and Installation Check Items Check MCC equipment for: alignment, levelness, and tightness of all bolting. Check all equipment for: removal of blocking, supports, temporary ties, and temporary wire jumpers. Check that all protective barriers are properly installed. Check door alignment of individual starter units and door interlock operation. Check operation of external overload protective […]

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8 Important Checks To Do Before Powering Up The Dry-Type Transformer

8 Obligatory Checks The transformer should be powered up only after checking the following 8 items: 1st Check (name plate ratings) Make sure the name plate ratings are in accordance with the ratings foreseen for the place of installation. 2nd Check (parallel operation) When transformers are to be operated in parallel, make sure they are […]

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Testing and Commissioning Procedure For Motors

Scope Of Motor Testing It should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. Motor vibration shall be measured in a tri-axial direction, i.e.: Point x axis – side of bearing housing at shaft height Point y axis – top of […]

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