Problem 5.5: A 460-V bus in a factory supplying power to several feeders has the Thevenin source impedance behind the bus equal to 0.002 + j0.01 Q/phase. A power factor-correcting capacitor rated 500 kVARh is connected to the bus as shown in Figure P5.5. Determine the parallel resonance frequency and iden- tify the precaution needed for connecting a power electronics load to this bus.

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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.