Recently Published Blogs
Circuit breakers should be tested on regular intervals to mitigate the risk of failure. A faulty breaker can cause a lot of problems if a fault condition were to occur. It is a good idea to have reliable tools that can thoroughly test the circuit breakers to avoid problems in the electrical system. One of the tools that offers complete diagnostic features for secondary injection testing of circuit breakers is the ABB PR010/T Secondary Injection Test Set.READ MORE >>
Insulation plays a very important role in an electrical system. Without electrical insulation, the electricity flowing in the conductors is exposed to short circuit to other conductors or create the risk of electrocution to personnel. It is important to always check the integrity of insulation to ensure the safety and reliability.READ MORE >>
Low resistance measurements are a valuable part of electrical system reliability. This type of testing helps to identify high impedance electrical connections that can result in excess heating, losses and potentially failure of power system components.READ MORE >>
Often, the breakdown of unsuspecting components can trigger failures and result in hazardous conditions to patients, doctors, medical personnel and facility devices.READ MORE >>
The capacitor discharge technique is performed with a surge generator, nicknamed “thumper.” This device converts line power into high voltage, unidirectional, impulses that are transmitted into a faulted power cable. A simplified circuit of a surge generator connected to a faulted cable is shown in Figure 1.
Figure 1.READ MORE >>
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 >>
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 >>