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Vanguard's EZCT series of current transformer testers are designed to be rugged and portable, ideal for industrial and field applications. They can perform the CT excitation, polarity and ratio tests. These testers allow you to test current transformers in their field-mounted configuration. This reduces the need to remove the CT from the host electrical component.

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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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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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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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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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The Vanguard CT-8000 S3 Digital Circuit Breaker Analyzer can fully analyze a circuit breaker's performance by measuring the main contact and resistor contact time, stroke, velocity, over-travel, bounce back and contact wipes.

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The Vanguard CT-8000 S3 can perform dynamic-resistance tests using a 200-ampere, built-in, DC power supply. One channel is available for performing a dynamic contact resistance test. The resistance measuring range is from 1 micro-ohm to 1,999 micro-ohms.

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Transformer configuration designations like “Delta” and “Wye” originate from the way the windings are connected inside the transformer. These connections determine the way the transformer will perform, and they also determine the methods of calculation required for properly applying a given transformer.

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Metering current transformers and the protective current transformers differs in roles and design, but require the same common current transformer testing practices to ensure their electrical condition, and that they are properly connected to the rest of the system.

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The first Vanguard product was a computerized circuit breaker analyzer, which became the forerunner of an entire series of circuit breaker test equipment. Since then, the Vanguard product line has expanded to include microcomputer-based, precision micro-ohmmeters, single and three phase transformer winding turns ratio testers, transformer winding-resistance meters, mega-ohm resistance meters, and a variety of other electrical utility maintenance support products.

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Current transformers (CTs) are an important component of an electrical systems infrastructure.

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A Current transformer reduces high voltage currents to a lower value and allows for the safe monitoring of electrical current flow.

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Rugged and portable, the Vanguard EZCTs are microprocessor-based, current-transformer test sets with the ability to perform current transformer (CT) excitation, CT current-ratio, and winding polarity tests.

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