Design Criteria To match your monitoring circuitry to a specific CT, you need to know the CT characteristics in relationship to input current, turn ratio, and frequency range. The Rb referenced in the curves below is defined as Rb = 1 Volt/Is, the value which will yield one volt per amp...
The Tesla primary consists of approximately 8 turns of #6 gauge copper ground wire which is commonly available at most hardware stores. About40 feet will be needed for our purposes. This wire is wound onto a wooden form, the construction of which I will now describe. Begin construction by c...
2. Full-featured: CT volt-ampere characteristic test, inflection point calculation and error curve, CT ratio polarity test, contrast calculation, secondary side circuit inspection, PT volt-ampere characteristic test, PT ratio polarity test. Automatically records show that all kinds of test re...
The process begins with the “User Turns” section of the “MAX13256 Transformer Design” spreadsheet as seen in Figure 14. Figure 14. User turns section of the MAX13256 transformer design spreadsheet. Note the values in cells C30, C31, and C32. These are the minimum turns needed. We star...
Once the turns have been established, the initial calculations must be redefined. Flux Walking Faraday's Law states that the flux through a winding is equal to the integral volt-seconds per turn. This requires that the voltage across any winding of any magnetic device must average zero over a...
Assuming a 1:1 turns ratio, the load current from the bias supply appears as a DC current in the gate drive IC. Therefore, we can use the following equation as an estimate: P = Iload2 × Roℎ + Rol (18) To improve the accuracy of the equation, we can add the RMS current due...
2. Full-featured: CT volt-ampere characteristic test, inflection point calculation and error curve, CT ratio polarity test, contrast calculation, secondary side circuit inspection, PT volt-ampere characteristic test, PT ratio polarity test. Automatically records show tha...
Now, rate of change of flux per turn means induced electro motive force in volts. Therefore, average electro-motive force induced/turn = 4f Ømaxvolt If flux Ø varies sinusoidally, then r.m.s value of induced e.m.f is obtained by multiplying the average value with form factor. ...
Because the relationship between input and output voltages is simply the transformer turns-ratio, the accuracy of the input would impact the accuracy of the output. There is no requirement from the transformer driver, while the input voltage accuracy is demanded by the output voltage requirements. ...
While Vt-wise all of these transformers can be driven by the SN6501, other important factors such as isolation voltage, transformer wattage, and turns ratio must be considered before making the final decision. 8.2.2.5.2 Turns Ratio Estimate Assume the rectifier diodes and linear regulator has ...