18
Apr
Non Linear Electrical Loads. The changing impedance. Non-linear loads change the shape of the current waveform from a sine wave to some other form. These pulses distort the current waveforms which in turn generates harmonics that can lead to power problems. Non-linear loads create harmonic currents in addition to the original fundamental frequency AC current causing.
Electrical Equipment loads where the impedance changes with the applied voltage are considered to be non-linear. For resistive and most inductive loads current is also sinusoidal but rectifiers charging a battery draw an almost square wave current pulse. Non-linear loads are not new. Applies to those ac loads where the current is not to the voltage. Non-linear loads draw in currents in abrupt short pulses. Characteristics of nonlinear loads NONLINEAR LOAD CURRENT NOT PROPORTIONAL TO VOLTAGE Voltage supplied to a non linear system either by utility or generator set is sinusoidal.
A nonlinear circuit is an electric circuit whose parameters are varied with respect to Current and Voltage.
For resistive and most inductive loads current is also sinusoidal but rectifiers charging a battery draw an almost square wave current pulse. Non-linear loads can be motor controllers inverters welding equipment MRI scanner rectifiers UPS systems computers printers TVs etc. Non-linear loads impedance changes with the applied voltage. Whats happened is that the quantity of non-linear loads has grown exponentially. Electrical engineers inspectors and contractors and the National Electrical Code NEC have dealt with nonlinear loads for many years. ØA line current is the B-A load current minus the A-C load current.