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equipment you use every day.

Merlin Gerin ME Secondary Injection Test Set

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. 

Understanding Current Transformers – Part II Characteristics

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

Understanding Current Transformers – Part I Introduction

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.

Understanding Current Transformers – Part II Characteristics

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

What Is the Advantage of VLF Hipot Testing?

 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. 

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

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).

What Is the Advantage of VLF Hipot Testing?

 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. 

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

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).

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

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. 

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

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.