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Recently Published Blogs

What Is the Advantage of VLF Hipot Testing?

by Protec Tech Team May 20, 2019

 VLF hipot —very low frequency hipot — is an AC high potential instrument used for testing the dielectric strength of insulating materials at 0.1 Hz or lower. Instead of having to perform DC testing because high potential test equipment that operates at power system frequency are large, heavy and therefore not very portable, VLF high potential testing  makes testing cables and electrical apparatus in the field more practical and economical. 

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Rent the Omicron TESTRANO 600 Three-phase Power Transformer Test Set

by Protec Tech Team May 20, 2019

The Omicron TESTRANO 600 Three-phase Power Transformer Test System is a portable, three-phase power transformer test system, which supports most common electrical tests on power transformers for routine and diagnostic testing onsite or during factory acceptance tests (FAT).

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The Vanguard VBT-60, VBT-80 and VBT-80P Vacuum Bottle Testers

by Protec Tech Team May 14, 2019

Vacuum interrupters offer several advantages over older arc extinguishing contact systems found in circuit breakers and other types of switch gear. Vacuum breakers have long mechanical and electrical operating life and excellent switching capabilities. These sealed bottles create an envelop of negative pressure that is not conducive to the formation or sustaining of electrical arcs when contacts operate under load.  Additionally, since the contacts are encased in a bottle, they are not exposed to the contaminants found in many of the environments where they are utilized. They are virtually maintenance-free and have operation counts from 5000 to 1000000 before they reach their end of life. However, even if they have long operating lives, vacuum bottles should be tested for defects to avoid problems in the electrical system. 

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Vanguard Test Info: Why Use a DLRO (Digital Low Resistance Ohmmeter)?

by Protec Tech Team May 14, 2019

If you are reading this blog, it might be because it is time to break out a Micro-Ohmmeter to ensure the reliability of electrical connections throughout your electrical power system. The Vanguard Auto-Ohm is the ideal tool to use when evaluating the integrity of electrical bonds to power system equipment, as well as the contact resistance within the electrical equipment itself.  

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The Test Equipment You Need for Cable Preventive Maintenance

by Protec Tech Team May 01, 2019

Cables are exposed to the elements like moisture, dirt and other contaminants. They are also subjected to mechanical and electrical stress during operation. This is the importance of regular testing of cables. Predictive maintenance often employs diagnostic type tests which will provide the test data necessary to prioritize the replacement of those cables before they become faulted and the source of unscheduled down time.

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How to Maintain Your Station Batteries … Part V … Ohmic Trending

by Protec Tech Team April 26, 2019

There are three types of ohmic battery testers — impedance testers, conductance testers and resistance testers. Each method is recognized by the IEEE and each can be used as a means of determining the State-of-Health (SOH) of a battery.  Perhaps one of the greatest values of ohmic testing is that it is performed while the battery is on-line and it fills the gap between discharge tests by providing an indication of internal changes to the battery.

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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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