Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Here are some things that use a 480-volt power supply:I. Industrial equipment fieldLarge electric motorsIn industrial production, many large electric motors require a higher voltage to provide sufficient power. For example, electric motors used to drive large fans, pumps, compressors and other equipment usually adopt 480 volts. These motors have relatively large power, generally ranging from several tens of kilowatts to several hundred kilowatts or even higher.For example, in a chemical plant, t

In an AC induction motor, using a star-delta starter (also known as a Y-△ starter) is a common soft-start method that reduces the inrush current during startup, thereby minimizing the impact on the electrical grid and the motor itself. However, this method also has some disadvantages. Below are some of the disadvantages of using a star-delta starter and how they can be addressed:Disadvantages1. Lower Starting Torque Problem Description: During the star connection phase, the starting torque is ap

The reason for using fuses on the low-voltage side of large power systemsProtect Circuit SafetyThe main function of a fuse in a circuit is to protect the safety of the circuit. When there is a fault or abnormality in the circuit, such as overloading or short circuit, the current will increase sharply. In this case, the fuse will automatically fuse and cut off the current, thus preventing damage to the devices in the circuit and avoiding the occurrence of safety accidents such as fire.Overload Pr

The relationship between reactance, resistance, and impedance1. ResistanceResistance is a hindrance to the flow of current in the circuit, which only considers the resistance properties in the AC circuit. The unit of resistance is ohm (Ω), and its calculation formula is as follows:R= V/IV is for voltageI is for currentResistance is present in both DC and AC circuits, but in AC circuits it is only part of the impedance.32. ReactanceReactance is the obstruction effect caused by alternating current

Calculation of reactive powerReactive power (Q) can be calculated by the following formula 4:Q = UIsin ΦAmong them:U is the effective value of the voltage,I is the effective value of the current,sinΦ is the sine of the phase difference between voltage and current.In three-phase induction motors, the unit of reactive power is usually watt (var), kilowatt (kvar) or megawatt (Mvar).Calculation of apparent powerThe apparent power (S) can be calculated by the following formula 4:S=UIAlternatively, fo

The sequential reversal effect on a three-phase induction motorThe sequential reversal of a three-phase induction motor has a certain impact on its operation, which can be analyzed from the following aspects:The impact on motor temperatureWhen a three-phase induction motor is frequently operated for forward and reverse rotation, the temperature of the motor may be higher than when it runs in one direction. This is because each reversal causes a change in the direction of current inside the motor

Adding an extra wire (or conductor) to a parallel circuit has several notable effects on the circuit: Enhanced Current Capacity: One of the main characteristics of a parallel circuit is that it allows more current to flow through. When an additional wire is added, the overall current-carrying capacity increases. This is because the parallel circuit provides more paths for the current to flow through, thereby reducing the overall resistance and allowing more current to pass. Voltage remains const

Calculating the number of turns per slot in a single-phase or three-phase induction motor (also known as an asynchronous motor) involves details of the motor's design and specific parameters. The design of the motor's windings aims to optimize the motor's performance, including efficiency, power factor, and reliability. Below are the general steps and methods to calculate the number of turns per slot:Overview of Steps Determine Motor Parameters: Understand the basic parameters of the motor, incl

When current flows through a circuit with lower voltage from a higher voltage, several scenarios may occur: Damaged Circuit Components: Circuits with lower voltages may not be able to withstand higher voltages, leading to the burning or permanent damage of components within the circuit (such as resistors, capacitors, transistors, etc.). Performance Degradation: Even if components are not immediately damaged, higher voltages can lead to a decline in circuit performance, such as changes in the ope

Relation between stator winding and voltageIn a DC motor, the number of turns in the stator winding (also known as the armature winding) directly affects the induced electromotive force it generates. The effective value of the induced electromotive force per phase of the stator winding E1can be calculated using the following formula:E1 = 4.44 K1 f1 N1 ΦAmong them: E1is the effective value of the induc