The ratings of a three-winding transformer are: Primary: Y connected, 66kV, 20MVA Secondary: Y conncetd, 13.2kV, 15MVA Tertairy : deta connected, 2.3kV, 5MVA Neglicting resistances and excitation current, the per-unit leakage reactances are: Xps 0.08 pu on a 20MVA, 66kV Xpt=0.1 pu on 20MVA, 66 kV Xst-0.09 pu on 15MVA, 2.3kV (a) Determine the per-unt reactanaces Xp, Xs, Xt using a system base of 20MVA, 66kV at the promary winding. ing lond and the

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.