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Recently Published Blogs

The M4110 Leakage Reactance Module from Doble Test Instruments

by Protec Tech Team April 19, 2019

Leakage Reactance testing is highly sensitive to transformer winding deformation.  When these type changes occur, electrical losses increase and make the transformer less efficient. Additionally, these type indications, as reflected in the impedance of a transformer, can be used as a diagnostic tool to help maintain the health of the transformer and ensure its continued service.

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High Current Low Resistance Testing with a 100A DLRO

by Protec Tech Team April 19, 2019

A 10 ampere Digital Low Resistance Ohmmeter is sufficient for many low resistance measurement applications. However, industry standards and guidelines will recommend, if not require a minimum of a 100 amps DC source when evaluating connections relating to medium and high voltage power system apparatus. Very small changes in contact resistance can have significant impacts on these apparatus in terms of how they perform in service.  The use of higher current helps in the precision of the measurement and is therefore preferred when evaluating connections in higher voltage applications.

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Power Sensor Trip Unit Testing with the GE PST1-1 Secondary Injection Test Kit

by Protec Tech Team April 10, 2019

A secondary injection test is a method of verifying the electrical operational characteristics of a circuit breaker. While not specifically addressing components in the primary current path of a circuit breaker, secondary injection testing is used to verify operational settings and characteristics in the decision making portion of the circuit breaker (solid state trip device).  This type of electrical operational testing can be conducted without the need for large, high powered primary injection test equipment. Since this method of testing only uses low level signals that the trip device would normally see from current sensor secondaries, it can also be less time consuming and generally safer than performing primary injection testing.

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Advantages of TDR Compared to Thumping in Underground Cable Troubleshooting

by Protec Tech Team April 10, 2019

Common methods of finding faults in direct buried cables is arc reflection or simply thumping. Thumping is a method that is performed by discharging a large amount of energy into a cable. This electrical energy will seek to arc across the path of least resistance to ground, which in this case would be the electrical insulating material that separates the center conductor from the outer shield, or concentric neutral.  When that arc occurs it often makes an audible thumping sound in the vicinity of the arc. If thumping is being performed where there is high ambient noise, or for some reason cannot be heard, directional acoustic detectors can be used in pinpointing the fault location. However, this method may require the cable to be thumped for a lengthy period of time while walking the path of the cable and listening.  If a TDR (Time Domain Reflectometer) is incorporated into the test, along with a thumper, then when the arc occurs, the TDR will reflected the change to the impedance of the insulation at the location of the fault. This would be the Arc Reflection method and can significantly reduce the thumping time necessary to locate the fault.  It can be used to localize the fault and if necessary pinpointed using an acoustic fault detector.

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Fluke Networks OptiFiber Pro Series 2 OTDR Rental Options From Protec

by Protec Tech Team April 04, 2019

The Fluke Networks OptiFiber Pro Series 2 is an OTDR designed to make every level of user more efficient whether working in data centers, outside plant, FTTx or PON applications.

Users can set up and shoot traces in no time by using the Auto OTDR function which analyzes the fiber under test and then chooses appropriate settings. The EventMap feature analyzes traces like an expert, calculating overall loss and reflectance, indicating events such as splices, splitters bends and connectors.

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Test Circuit Breaker Contact Response Time with Vanguard's CT Series of Circuit Breaker Timers

by Protec Tech Team April 04, 2019

Circuit breakers have a very critical purpose in an electrical system. They interrupt current if there is an overload in the main line. Their response should be very precise because a slow breaker may be too late to prevent damage in the electrical facility before it trips. A too sensitive and fast breaker may interrupt the current due to a harmless voltage spike. This can be a nuisance because you are always having to investigate the validity of the fault that tripped the breaker.

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Transformer Winding Resistance Measurement with Raytech Winding Resistance Meters

by Protec Tech Team March 28, 2019

Transformer winding resistance can help you determine the condition of transformers. When a transformer develops defects like coil to core or coil to coil shorts, opens and corroded connectors, the resistance of the windings change. It is a good idea to regularly test transformer components because a defect can cause severe power losses, electrical instability and eventual failure.

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Rent the Omicron ARCO 400, a Universal Test Set for Recloser Controls

by Protec Tech Team March 28, 2019

The Omicron ARCO 400 drastically simplifies recloser control testing, and offers a new way of testing that covers all of the circumstances in the field, no matter which type of recloser control that needs to be tested or which type of controller function needs to be verified. 

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When it Comes to Electrical Test Equipment, Protec Works Hard for You

by Protec Tech Team March 18, 2019

Whether you're looking to rent or purchase equipment, or if you just have a question regarding a specific test requirement, Protec's knowledgeable staff is here to help.

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Protec Connect - The Only App You Need for Electrical Test Equipment

by Protec Tech Team March 18, 2019

Introducing Protec Connect

Renting electrical test and measurement equipment just got a whole lot easier.

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Three Phase Relay Diagnostics with the Megger MPRT 8430 Relay Tester

by Protec Tech Team March 07, 2019

Relays undergo electrical and mechanical stress during operation. This can result in the premature deterioration of the relay system. It is a good idea to always check if the relays are working properly. Additionally, acceptance testing allows verification of the programmed characteristics of the relay. This lets you correct operational deficiencies or programming errors prior to it becoming an issue.

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Megger and Doble – The Best Electrical Test Equipment

by Protec Tech Team March 07, 2019

Electrical test equipment rental is very common these days. There are many companies that give you different kinds of testing devices at reasonable rates. Devices like oscilloscopes, network analyzers, function generators, spectrum analyzers, logic analyzers, and telecommunication test equipment are readily available for rental or lease. But the problem is, which one should you rent? For this, you need to analyze your needs and understand your requirements. Two major companies in the electrical testing industry are Megger and Doble.

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