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Recently Published Blogs

Protec Carries a Full Line of Vanguard Products for All Testing Needs

by Protec Tech Team October 23, 2017

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.


Perform Diagnostic Transformers Testing with Vanguard EZCT-2000C Plus

by Protec Tech Team May 23, 2017

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


Rent a Vanguard EZCT-2000C Plus for Reliable Current Transfomer Testing

by Protec Tech Team December 02, 2016

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


Rent Vanguard EZCT Current Transformer Test Sets from Protec

by Protec Tech Team August 09, 2016

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.


Rent Electrical Test and Measurement Equipment from Protec Today

by Protec Tech Team June 08, 2016

Each Protec office maintains a full complement of electrical test and measurement equipment. Offering equipment from all of the premiere manufacturers for rent, lease or purchase, Protec has the electrical testing equipment you need to get the job done.

Whether you're in the market for a Micro-Ohmmeter like the AEMC 6250 10A Micro-Ohmmeter, offering output up to 10 Amps, this test set is uniquely designed to conduct tests on both resistive and inductive material, with operator selection directly from the front panel.


Rent the Vanguard TRF-100 Automatic Three Phase TTR from Protec

by Protec Tech Team May 26, 2016

The Vanguard TRF-100 Automatic Three Phase TTR is a microprocessor-based, automatic, three phase, transformer turns-ratio tester.

A lightweight, portable unit designed for testing transformers at utility power substations, the TRF-100 Automatic Three Phase TTR determines the transformer turns-ratio using the IEEE C57.12.90 measurement method.


Rent the Vanguard CT-7000 Digital Circuit Breaker Analyzer from Protec

by Protec Tech Team March 07, 2016

A stand-alone, microcomputer-driven extra high voltage circuit breaker analyzer, the Vanguard CT-7000 Digital Circuit Breaker Analyzer applies a test voltage of 35 Vdc to each of the contact channels thus allowing an analog to digital converter (A/D) to determine if a close, an open or an insertion resistor was the state of contact.


Collect Data for Up to 90 Minutes with the Vanguard TRM-403

by Protec Tech Team January 06, 2016

In the past, winding resistance measurements were taken using the Kelvin Bridge, an arrangement of resistors which enables the measurement of very low resistances.  Winding Measurement Kits work by injecting known current through the winding and measuring the voltage drop across the winding.


Protec Offers a Wide Range of Vanguard Test Equipment

by Protec Tech Team December 02, 2015

Whatever your electrical test and measurement needs might be, rely on the wide range of Vanguard test equipment offered by Protec.

Transformer Turns Ratio Testers

Vanguard TRI-PHASE True Three Phase TTR





Keep CTs in Good Working Condition with Vanguard EZCT Test Sets

by Protec Tech Team September 25, 2015

Current transformers are often used to convert high currents to a lower one which is safe enough for measuring instruments or protective devices to use. It is also used in monitoring the power facility during operation. It is important to keep them in good working condition because this can cause inaccurate measurements or sometimes damage the electrical facility.


Measure EHV Circuit Breaker Contact Resistance with Vanguard TRM-403

by Protec Tech Team August 24, 2015

A three phase transformer winding resistance meter, the Vanguard TRM-403 Transformer Resistance Meter can accurately measure resistance from 1 micro-ohm to 500 Ohms, it can be used as a micro-ohm meter to measure EHV circuit breaker contact resistance, or for any low resistance measuring application.

The Vanguard TRM-403 Transformer Resistance Meter can perform a special test to collect data automatically for up to 90 minutes (at 60-second sampling intervals) or 45 minutes (at 30 second sampling intervals). The test data is recorded with a time stamp. All test results can be printed on the unit’s built-in 2.5” wide thermal printer.


Vanguard LTCA-40 Load Tap Changer Analyzer Capable of Outputting 40A

by Protec Tech Team August 21, 2015

For measuring winding resistance of highly inductive power transformers consider the Vanguard LTCA-40 Load Tap Changer Analyzer.

Triple resistance-reading channels allow the Vanguard LTCA-40 Load Tap Changer Analyzer to measure three winding resistances simultaneously. Four-wire (Kelvin) connections provide high accuracy and require no lead compensation. A special feature of the Vanguard LTCA-40 is its ability to measure and graph the resistance trace of a transformer LTC during operation. Using a 60Vdc power supply, the Vanguard LTCA-40 is capable of outputting 40 amperes.


Protec Equipment Resources Inc.
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Grand Prairie, Texas 75050

Phone: 972.352.5550
Fax: 972.352.5553

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