Iris Power PDAlert Bantam PD Detection During Short Risetime Voltage Surges
... inverters using IGBTs/IGCTs in the early 1990s created a new stator winding failure mechanism in motors rated as low as 440 V. In “random wound” motor stator windings typical of motors rated less than 1000 V, partial discharges were found to occur due to the short risetimes of the voltage impulses. ...
... inverters using IGBTs/IGCTs in the early 1990s created a new stator winding failure mechanism in motors rated as low as 440 V. In “random wound” motor stator windings typical of motors rated less than 1000 V, partial discharges were found to occur due to the short risetimes of the voltage impulses. ...
Using Your Solid State Anodizer
... The unit is shipped ready for bench operation after connection to an AC power source. The supply is air cooled. Sufficient space should be allotted so that a free flow of cooling air can reach the rear of the instrument when it is in operation. It should be used in an area where the ambient temperat ...
... The unit is shipped ready for bench operation after connection to an AC power source. The supply is air cooled. Sufficient space should be allotted so that a free flow of cooling air can reach the rear of the instrument when it is in operation. It should be used in an area where the ambient temperat ...
A Solution to Simplify 60A Multiphase Designs
... As the ratio of output voltage to input voltage increases, and/or switching frequency increases, the high and low side power MOSFET switches must be carefully optimized and balanced for the application as outlined in the power loss equations of Figure 1 (ref. 1). Significant advances in technology ( ...
... As the ratio of output voltage to input voltage increases, and/or switching frequency increases, the high and low side power MOSFET switches must be carefully optimized and balanced for the application as outlined in the power loss equations of Figure 1 (ref. 1). Significant advances in technology ( ...
TechTopics No. 20 - Power factor correction capacitor
... the motor when the motor is switched off. At the instant that the motor is switched off, the motor and the driven load are at full speed. When the motor is switched off, the motor and load inertia will continue to drive the motor. If the magnetizing current required by the motor is available from th ...
... the motor when the motor is switched off. At the instant that the motor is switched off, the motor and the driven load are at full speed. When the motor is switched off, the motor and load inertia will continue to drive the motor. If the magnetizing current required by the motor is available from th ...
a novel wall-switched step-dimming concept in led
... At full load and rated voltage of 220 V, the measured input power factor is 0.993 and current THD is 2.81% with an efficiency of 90.51%. INTRODUCTION: Owing to the advantages of LED solutions in lighting industries, this is an attractive field of study and research. The fundamental requirement of an ...
... At full load and rated voltage of 220 V, the measured input power factor is 0.993 and current THD is 2.81% with an efficiency of 90.51%. INTRODUCTION: Owing to the advantages of LED solutions in lighting industries, this is an attractive field of study and research. The fundamental requirement of an ...
STP 3 & 4 8.0 Electric Power 8.1 Introduction
... Three non-Class 1E buses and one Class 1E division receive power from the single unit auxiliary transformer assigned to each load group. Load groups A, B and C line up with Divisions I, II and III, respectively. One winding of the reserve auxiliary transformer may be utilized to supply reserve power ...
... Three non-Class 1E buses and one Class 1E division receive power from the single unit auxiliary transformer assigned to each load group. Load groups A, B and C line up with Divisions I, II and III, respectively. One winding of the reserve auxiliary transformer may be utilized to supply reserve power ...
Reducing the Total No-Load Power
... the beneficial effect will be twice as great on the primary side. ...
... the beneficial effect will be twice as great on the primary side. ...
power supply measurement tips
... n Monitor input and output voltages, as well as feedback or control signals to verify that the loop response (e.g. critical damp ing) is as expected during changes of input voltage and output load. n Monitor the input and output voltages and currents along with the control signals t ...
... n Monitor input and output voltages, as well as feedback or control signals to verify that the loop response (e.g. critical damp ing) is as expected during changes of input voltage and output load. n Monitor the input and output voltages and currents along with the control signals t ...
Document
... scientist Nikola Tesla (born 1856, died1943). It is a high voltage, high frequency, power generator, primarily built for conducting experiments and to observe phenomenon associated with alternating electricity. With this coil, Tesla was able to generate voltages of such magnitude, they would shoot o ...
... scientist Nikola Tesla (born 1856, died1943). It is a high voltage, high frequency, power generator, primarily built for conducting experiments and to observe phenomenon associated with alternating electricity. With this coil, Tesla was able to generate voltages of such magnitude, they would shoot o ...
Power factor
In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit, and is a dimensionless number in the closed interval of -1 to 1. A power factor of less than one means that the voltage and current waveforms are not in phase, reducing the instantaneous product of the two waveforms (V x I). Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power will be greater than the real power. A negative power factor occurs when the device (which is normally the load) generates power, which then flows back towards the source, which is normally considered the generator.In an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The higher currents increase the energy lost in the distribution system, and require larger wires and other equipment. Because of the costs of larger equipment and wasted energy, electrical utilities will usually charge a higher cost to industrial or commercial customers where there is a low power factor.Linear loads with low power factor (such as induction motors) can be corrected with a passive network of capacitors or inductors. Non-linear loads, such as rectifiers, distort the current drawn from the system. In such cases, active or passive power factor correction may be used to counteract the distortion and raise the power factor. The devices for correction of the power factor may be at a central substation, spread out over a distribution system, or built into power-consuming equipment.