In response, the current pump control circuit generates a control signal which is used to generate a current component at the fundamental frequency which lags the line voltage by approximately 90 degrees. This fundamental frequency current component is transmitted through an impedance to the power ...
energy from the system to charge their plates and then return the stored energy when theelectric chargeis removed. Capacitors oppose the change in voltage and cause the current toleadthe voltage by π/2 radians (90 degrees). They oppose the AC because of theircapacitive impedancedenoted byXC....
A bolted fault behind the relaying point will result in the current leading the voltage by 180°–∠θLINE. In Fig. 8(A), we see that the current lags the voltage by the transmission line angle. A voltage-polarized distance element would identify the fault as being in the forward ...
The faulted voltage should drop in proportion to the severity of the fault The fault current should be significantly larger than the normal load current. The fault current should lag the voltage by 40-89.9 degrees depending on the line characteristics, voltage, and severity of the fault. The no...
The load power factor is said to be lagging which implies that the load impedance should have an inductive component (current lags voltage). That in turn implies that the angle associated with that impedance should be positive. So fix up your load impedance. Nov 21, 2014 #32 magician ...
the burden resistor voltage 98d lags the line voltage VCA 99d by approximately 90 degrees. Therefore, when the reactive phase angle between the line voltage VCA and burden resistor voltage is a leading value as in FIG. 1c, the generator excitation 25 is to be reduced. Conversely, when the...
two steps of start and stop control are used to compensate for the difference. The clock rate is governed by the position feedback signal. Although, this technique uses two levels of voltage for motor windings, it involves essentially a digital drive and has nothing to do with the instant in...
motor voltage. Thus, the field current, which lags 90 degrees behind this voltage, is nearly in phase with the motor voltage and produces an armature counter-electromotive force nearly in opposition to the impressed voltage.
A current pump control circuit (132) receives an input signal which is representative of the power line voltage and generates a control signal which is used to generate a fundamental frequency current component which lags the line voltage by approximately 90 degrees. This fundamental frequency ...
On closure of switch 10a the transformer 4, the core of which is only unsaturated in the neighbourhood of zero current passage and the current in which lags nearly 90 degrees behind the voltage, charges the condenser 7 through the rectifier 8 and removes the blocking voltage from the grid ...