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Recently Published Blogs

Measure Low-Resistance with Test Equipment from Protec

by Protec Tech Team July 28, 2015

An electronic device that measures electrical resistance, ohmmeters come with different levels of sensitivity; some are designed to measure low-resistance materials, while others measure higher resistance.

An ohmmeter functions by passing a constant current or voltage though an object, such as voltage from a battery, and then measuring the resulting current with an ammeter after it passes through the resistance. The higher resistance the material has, the less current will pass through it. An ohmmeter is typically not used to measure resistance across an entire circuit, but rather through different parts of the circuit, although it can be used to test that a circuit is not broken. Components of a circuit can be removed and tested individually for resistance.

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Perform Multiple Current Transformer Tests with the Vanguard EZCT-2000A

by Protec Tech Team July 16, 2015

The Vanguard EZCT-2000A Automated CT Test Set is a microprocessor-based Current Transformer Test Set capable of performing Current Transformer (CT) excitation test, measure the CT current-ratio and polarity and CT winding resistance automatically.

Excitation Test

The CT excitation test is performed using the ANSI/IEEE C57.13.1, IEC 60044-1 test method. The test voltage range for the CT excitation test (50 Vac, 300 Vac, 500 Vac, 1200 Vac or 2000 Vac) can be selected, and then the test voltage is raised and lowered automatically by the Vanguard EZCT-2000A Automated CT Test Set.. The excitation test voltage and current data is collected and stored in the unit’s internal memory. Any of the 10 possible combinations of X1 to X5 can be tested since all of the unit’s test leads can be connected to all of the CT output terminals at the same time. Up to 10 excitation tests can be stored in one record. Once the test is completed, test results can be printed and excitation curves can be plotted on the built-in 4.5-inch wide thermal printer.

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Rent the Vanguard TRM-403 For Any Low Resistance Measurements

by Protec Tech Team July 02, 2015

The Vanguard TRM-403 Transformer Resistance Meter can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply.

The Vanguard TRM-403 ‘s test current is selectable from 1A to 40A, can accurately measure resistance from 1 micro-ohm to 500 Ohms, and can be used as a yes

micro-ohm meter to measure EHV circuit breaker contact resistance, or for any low resistance measuring application.

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Specifications for the Vanguard Auto-Ohm 100 Ampere Micro-Ohmmeter

by Protec Tech Team June 25, 2015

The Vanguard Auto-Ohm 100 Ampere Micro-Ohmmeter applies a true DC current from 10A to 100A to the resistance load to be tested. Any test current setting can be selected by using the function control knob on the front panel.

The Vanguard Auto-Ohm 100 Ampere Micro-Ohmmeter controls the test current’s rise and fall rates by using a switching DC power supply and a current regulator circuit.

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Vanguard TRI-PHASE A True Three Phase Transformer Turns Ratio Tester

by Protec Tech Team June 02, 2015

The Vanguard TRI-PHASE True Three Phase TTR can be used as a stand-alone unit or can be computer-controlled. It can be operated locally using its alpha-numeric keypad and rotary switch. Information is displayed on a back-lit LCD screen (128 x 64 pixels) that is viewable in both bright sunlight and low-light levels. 

The Vanguard TRI-PHASE True Three Phase TTR can store up to 112 test records and 128 test plans in Flash EEPROM. Test records or test plans can be stored or transferred to and from a PC via the available interfaces (RS-232C port, USB port, USB Flash drive port).

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Large Selection of Micro-Ohmmeters Available for Rent from Protec

by Protec Tech Team June 02, 2015

The gaps in joined conductors may accumulate contaminants like moisture, dirt and grease, and as the contaminants accumulate between the joined metals, they introduce resistance. Used to measure junction resistance of joined conductors, Micro-Ohmmeters can evaluate the internal condition of the joined metals. 

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Measure 3 Winding Resistances Simultaneously with the Vanguard LTCA-40

by Protec Tech Team May 26, 2015

The Vanguard LTCA-40 Load Tap Changer Analyzer is designed to accurately measure the winding resistance of highly inductive power transformers. The unit’s triple resistance reading input channels can measure three winding resistances simultaneously.

A special feature of this device is its ability to measure and graph the resistance trace of a transformer LTC or voltage regulator contact during operation. One resistance input channel is dedicated to this feature. The Vanguard LTCA-40 Load Tap Changer Analyzer provides stable resistance readings of very large transformers by utilizing a 60 Vdc power supply capable of outputting a test current up to 40 Amperes.

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Accurately Measure Inside Transformers with Vanguard EZCT Test Sets

by Protec Tech Team May 21, 2015

Vanguard’s EZCT Automatic CT test sets accurately measure what is going on inside transformers. Their  durable automated system can test turns ratio, winding polarity and excitation current without the need for bushing or current transformer removal all using a microprocessor based process. The EZCTs allow simplified testing in the field with results printed using the onboard thermal printer or stored for later retrieval using a PC or laptop.

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Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter Specifications

by Protec Tech Team May 15, 2015

With a Dual Ground option, the Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter can measure circuit breaker contact resistance with both sides of the breaker bushing being grounded.

When a test current is applied to a circuit breaker with both sides grounded, some of the test current flows through the safety ground cables. Using an external current sensor, the Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter measures and eliminates this current from the total test current.

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For Complete CT Testing Rent the Vanguard EZCT-2000C Plus from Protec

by Protec Tech Team May 12, 2015

Using the Vanguard EZCT-2000C Plus Automated CT Test Set CT excitation test is performed using the ANSI/IEEE C57.13.1 test method. Test voltage ranges from 50, 300, 500,1200 and 2000 Vac can be selected for the excitation test. The test voltage is raised and lowered automatically by the EZCT-2000C Plus.

The excitation test voltage and current data is collected and stored in the unit's internal memory. Knee point voltages (ANSI 10/50, IEC 60044, IEEE-30, IEEE-45) are calculated and printed on the test report. All of the test leads can be connected to the CT output terminals (X1, X2, X3, X4 and X5), and there is no lead switching required during testing. 

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Vanguard Auto-Ohm 100A for Controlled Measuring of Very Low Resistance

by Protec Tech Team May 11, 2015

Vanguard test equipment has been around for years and has served the electrical testing needs of many engineers with sophisticated features that allow electrical tests to be done easily. Engineers trust this equipment because of its accuracy and reliability.

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Eliminate the Need For Lead Switching With the Vanguard EZCT-2000A

by Protec Tech Team April 27, 2015

A current transformer (CT) transforms higher current into a more manageable secondary current during normal operation. This change is made possible by copper coils wrapped around an iron core, with the ratio between primary and secondary currents determined by the ratio between the number of primary and secondary turns.

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Protec Equipment Resources Inc.
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