UTEC 505 

01.

The CT Ratio Test feature provides for measuring the CT ratio as an ‘Actual’ ratio or a ‘Best Fit’ ratio. If the CT/PT Burden option is installed, ratios can be measured with and without burden applied. In addition, the phase angle between the primary and secondary is measured.

CT or PT Burden Tests can be performed using two methods. The first method allows the user to add an individual burden to the secondary. The second method allows the user to add a complete sequence of burdens to the secondary. The on-board microcontroller automatically applies the burden for 1 second to prevent resistive element burnout. The display provides for the recall of test values for each burden applied. The Before Burden, and After Burden currents are displayed together with the Percent (%) of change between Before and After Burden readings.

The measurement technique of the 505 eliminates the uncertainty of burden testing in services where continuous current changes are present. It reduces the interpretative requirements of the user since the reduction of CT secondary loop current due to the addition of the selected burden is displayed as a % of the original current. This new measurement method can respond to CT secondary loop currents as low as 0.2 amperes. When performing PT burden testing, both of the test methods can be performed with and without the meter voltage coil attached to the PT secondary.

A CT Demagnetization, or demag, can be done easily if the CT has at least 2.5 amperes in the secondary loop. A quick demag test on a CT that is saturated can save time and money by preventing the unnecessary change out of a good CT. This function applies a series of resistances in a smooth fashion from 0.1 ohm to 8 ohms and back down to 0.1 ohm again to the CT secondary loop. This over burden applied should drive the CT over the knee of the Bh curve (saturating the CT) and demagnetize the core.

Data collected during the test may be saved. Test records can be stored and downloaded to software provided for viewing and exporting the saved test results. Saved data may also be recalled for viewing from the 505.

The UTEC 505 Transformer Analyzer is the ultimate answer to in service CT and PT Testing!