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.READ MORE >>
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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.READ MORE >>
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.READ MORE >>
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.READ MORE >>
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.READ MORE >>
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.READ MORE >>
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.READ MORE >>
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.READ MORE >>