Testing the effectiveness of electrical insulators can be done using Power factor testing. This test applies to medium and high voltage equipment such as transformers, oil filled capacitors, motors, bushings or any electrical device with an insulator. Doble Engineering is one of the leading manufacturers of Power factor testers. One popular tester is the Doble M4000 M4100 Power Factor Insulation Analyzer.READ MORE >>
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Understanding cable system configurations …
The three cables that make up a 3 phase circuit can be placed in different formations. Typical configurations include the trefoil or triangular and the flat formation. The choice will depend on several factors like screen bonding method, conductor area and available space for installation.
Typical cable formations
Capacitance and Dissipation Factor (C&DF) test equipment can sometimes be limited by their power supply when testing highly capacitive objects. An example of power system apparatus that might fall into this category would include large motors, generators or cabling. Test specimens that have a characteristically higher capacitance value will sometimes achieve a maximum output current from the test equipment at less than the desired test voltage. By appropriately positioning a resonating inductor that is adjusted to resonate with the capacitance of the test object, the range of charging current from the test equipment can effectively be extended to accommodate testing of more capacitive test objects.READ MORE >>
The measure of a system’s reliability of operation is known as its power quality. It is essential to check and maintain power quality, as a failure to do so may lead to significant losses through heating, unscheduled downtime and the and the shortened life cycle of power system apparatus.READ MORE >>
Some of the more common misoperations of electro-mechanical relays can be attributed to welded contacts or open circuited operating coils. While these type issues may initially appear to be small and inconsequential, if not detected early, the impacts can seriously affect the protection and reliability of electrical distribution. The failure of protective relays to operate in actual fault conditions can be extremely dangerous to the electrical system itself and more importantly...to those who work near the affected circuit.READ MORE >>
When it comes to the testing of protective relays, the Omicron CMC 356 Universal Relay Test Set and Commissioning Tool offers high powered solutions to engineers needing versatile equipment that can test multiple generations of differing types of relays.READ MORE >>
The magnetically supported Iris Power RIV800 Robotic Camera Inspection Vehicle has been developed to provide an automated scanning method for the ELCID stator core interlaminar insulation test equipment.
The Vehicle allows scanning of the stator core of a generator or large motor, in order to test the integrity of the stator lamination insulation more efficiently. The equipment can also be adapted to carry other lightweight attachments for stator inspection including the mini-camera or wedge tightness probe. A single control unit is used to provide power and control to the vehicle and camera module.READ MORE >>
Engineers prefer to test electric cables using very low frequency or VLF Hipot testing because of its safety and simplicity. This diagnostic test checks if the cable is still capable of withstanding the electricity passing through it. A test voltage of slightly higher than the cable's rating is applied and held for a specified time depending on the purpose for which the test is being performed. If the cable is bad, the defects in the cable will further deteriorate to the point of failure.READ MORE >>
In past blogs we discussed methods for localizing and pinpointing faults on medium and high voltage electric power cables. These methods focused on the use of high voltage surge generators (thumpers), high voltage radar techniques (arc reflection) plus electromagnetic and acoustic pinpointing. These techniques work well for medium and high resistance faults on shielded cable structures, but do not lend themselves to low voltage cables or pilot cables (signal and control lines).READ MORE >>
Used with the Fluke 1736 Power Quality Analyzer, the Fluke i40s-EL 3pk Clamp-on Current Transformer is used for low current measurement; suitable for making measurements up to 40A, and also measures accurately on 1A and 5A secondary current transformers.
The i40s-EL jaw is capable of being clamped on current conductors up to 15mm in diameter.READ MORE >>
The KMET45811 allows the Cooper Power Systems Type MET Electronic Recloser Control Tester to be utilized for testing Triple/Single Recloser Controls.
With Amphenol plugs to simplify connections, the KMET45811 provides visual open/close indication independently per phase.READ MORE >>
The Phenix Technologies 6CP100/50-10 AC Dielectric Test Set is a portable, rugged AC high voltage test set ideally suited for use in the field or in the laboratory. The 6CP100 offers a complete test system in a mobile package and utilizes a combination control and regulator enclosure and a separate high voltage section.
The system is equipped with advanced digital metering, and control and protection devices which are easy to use and provide all the necessary information to safely operate the system.READ MORE >>