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Protective Relay Testing with Omicron CMC 356

by Protec Tech Team June 11, 2019

Using the Omicron CMC 356 Universal Relay Test Set and Commissioning Tool enables engineers to have advanced functionality right at their fingertips. Verifying correct wiring is a must for wires coming from cubical terminals to the relay, between instrument transformers and relays as well as between the testing equipment and relay.

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Megger Delta 2000 Power Factor Test Set

by Protec Tech Team June 11, 2019

When it’s time to assess the condition of electrical insulation in high voltage conditions such as transformer equipment, circuit breakers, cables, bushings and rotating machinery, there is no better solution than the Megger Delta-2000 Power Factor Test Set. Megger C & DF (Power Factor) test units are known for their comprehensive insulation diagnostics, and the Delta-2000 lives up to the Megger name.

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Merlin Gerin ME Secondary Injection Test Set

by Protec Tech Team June 05, 2019

With the critical role of circuit breakers, it is very important to periodically verify that they are performing as designed and intended. Numerous electrical circuits can potentially be compromised if a circuit breaker fails to trip when fault conditions occur. As with any new product, we expect it to work properly right straight out of the box. The unfortunate truth is that this isn't always the case.  The same is true about circuit breakers.

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This is why their proper operation should be verified as an acceptance test.  Additionally, circuit breakers experience environmental, mechanical, electrical and thermal stresses over the course of their service. A well planned preventative maintenance program can help in avoiding unplanned downtime and service interruptions due to what is often an avoidable mis-operation. Additionally, early detection of performance concerns can save on the cost of equipment repair and/or replacement. 

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Understanding Current Transformers – Part II Characteristics

by Protec Tech Team May 28, 2019

When looking at the accuracy of a CT a number of factors need to be taken into consideration.  These factors will include:

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Understanding Current Transformers – Part I Introduction

by Protec Tech Team May 28, 2019

Current transformers are a commonly used device found in metering and protective relay applications for the electrical power industry.  The purpose of these devices is to scale large primary currents to a smaller, easy to measure, secondary current.  The device also isolates the measuring and recording instruments.  Current transformers (CT) together with voltage transformers (VT) or potential transformers (PT) are known as instrument transformers.

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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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