Faulty electrical insulation is one of the leading causes of electrical fires. It can cause extensive damage to other components of the electrical system. A power factor test set helps detect faults in insulation by injecting a test voltage and measuring the capacitive and resistive leakage current.

Read More »The Megger CB-100

Rusty terminals or carbonized contacts can reduce the efficiency of electrical components in a power system. A digital low resistance ohmmeter is a test device that measures the resistances of bonded metals, relay contacts, electrical terminals or any metal in contact with another metal. An increase in resistance on these devices can be a sign of degradation.

Read More »The Improved Raytech Micro Junior II DLRO

Moisture, mechanical stress and arcing can cause bonded metals or electrical terminals to weaken. Rust and carbon deposits can form in-between the joints but may not show any physical signs of degradation. A digital low resistance ohm meter or a micro ohmmeter measures the resistance of the test sample then compares the current resistance with the baseline value. 

Read More »The Features of the AEMC 5600 DLRO

Protective relays and circuit breakers are regularly tested for possible flash hazards or component degradation because of their critical role in an electrical system. The common tests done are the primary and secondary injection tests.

Read More »Need a Secondary Injection Test Set? Get it from Protec

Time domain reflectometers are used to detect cable faults. It can test cables and detect faults up to a distance of 10000 feet. A TDR detects cable problems by sending a pulse and measuring the time of the pulse echo. Cable problems like poor splicing, discontinuity and poor joints can change the impedance of the cable which causes the pulse to be reflected back. 

Read More »The Megger CFL510F TDR is available for Rent from Protec

One way to detect problems on welded joints and relay contacts is by using a digital low resistance ohm meter. It detects internal problems of joints or contacts by measuring its resistance. A small increase in its baseline resistance means that there is a change in composition of the material. Rust, dirt, pollutants or thinning of metal contacts are the common causes of resistance change.

Read More »The Megger 247001 DLRO

Digital Multimeters are important tools in testing electrical devices because of its multi-function capabilities. It can measure voltage, current, resistance, capacitance and frequency. This is why electricians always carry this tester when conducting electrical tests or repairs.

Read More »Protec offers the Fluke 87-III Digital Multimeter for Rent