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Electrical Engineering

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

22,945 Questions

What are the differences between plc solution and relay ladder logic solution?

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Asked by Wiki User

Control System Type: PLCs are programmable digital computers specifically designed for industrial automation, offering flexible control logic programming languages like ladder logic. Relay ladder logic, on the other hand, uses physical relays and wiring to create control circuits.

Programming Flexibility: PLCs allow for easy modification of control logic through software, facilitating quicker adjustments compared to the manual rewiring required in relay ladder logic.

Scalability and Integration: PLCs support integration with various industrial networks and systems, whereas relay ladder logic setups are typically standalone and less adaptable to complex automation requirements.

Maintenance Efficiency: PLCs enable remote diagnostics and troubleshooting via software tools, reducing downtime and improving maintenance efficiency compared to physical inspection needed for relay ladder logic.

Cost and Complexity: PLC solutions may initially involve higher costs but offer long-term savings through enhanced operational efficiency and reduced maintenance costs, unlike relay ladder logic setups, which may be simpler but less adaptable and scalable.

Industry Standard: PLCs have become the industry standard for industrial automation due to their versatility, reliability, and advanced features compared to traditional relay ladder logic systems.

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How do you connect 480 vac three phase power to a 480 vac single phase transformer?

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Asked by Wiki User

You would connect two of the three phase power lines to the primary winding of the transformer and leave the third one disconnected. This will effectively create a single phase system with a center tap.

How can you run a 380VAC 3-phase 50hz motor on a 220VAC 3-phase 60hz supply?

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Asked by Wiki User

To run a 380VAC 3-phase 50Hz motor on a 220VAC 3-phase 60Hz supply, you would need to use a voltage converter to step up the voltage from 220VAC to 380VAC. Additionally, you may need to adjust the motor's parameters to account for the difference in frequency between 50Hz and 60Hz, such as adjusting the motor's speed rating and ensuring the motor does not overheat due to the increased frequency. It's important to consult an electrician or motor specialist to ensure safe and proper operation.

Why noload current in big motors is higher than load current?

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Asked by Wiki User

In large motors, the no-load current is higher because the motor needs to overcome the friction and windage losses present when running without a load. These losses require more power to overcome, resulting in a higher current draw. When the motor is under a load, the additional power required to turn the load increases the current draw further.

What to do during short circuit?

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Asked by Wiki User

During a short circuit, immediately turn off the power source. Do not touch any exposed wires or attempt to fix the issue yourself. Contact a qualified electrician to safely inspect and repair the electrical system to prevent any further hazards.

What is dynamic stability in a three phase motor?

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Asked by Wiki User

Dynamic stability in a three-phase motor refers to the motor's ability to maintain proper speed and operation when subjected to sudden changes in load or operating conditions. A motor with good dynamic stability will quickly adjust its speed and torque to maintain steady operation without stalling or overheating. This characteristic is important for applications where the motor is subjected to variable loads or changing operating conditions.

Is line voltage understood as any voltage?

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Asked by Wiki User

No, line voltage specifically refers to the voltage supplied by the power utility and is typically 120V or 240V in residential settings. It is the voltage that powers household electrical systems and devices.

What does Good electrical insulator mean?

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Asked by Cezaroancea

A good electrical insulator is a material that does not conduct electricity easily. It has high resistance to the flow of electrical current, so it helps prevent the leakage or dissipation of electrical energy. Examples of good electrical insulators include rubber, glass, and plastic.

What size isolator for an 11kW 3 phase motor?

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Asked by Wiki User

For an 11kW 3 phase motor, you would typically need a isolator with a current rating of at least 18-20 amps per phase. It's important to also consider the starting current of the motor and select an isolator that can handle the motor's inrush current. Make sure to consult with a qualified electrician to determine the appropriate isolator size for your specific application.

What is phase voltage and line voltage in star connection?

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Asked by Wiki User

In a star connection, phase voltage is the voltage measured across each individual phase and neutral. Line voltage is the voltage measured across any two phases in the system. The line voltage is higher (√3 times) than the phase voltage in a star connection.

How many amps per leg can you pull on a 50 amp 3 phase connector?

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Asked by Wiki User

On a 50 amp 3 phase connector, you can pull 50 amps per leg. This means that each of the three phases can carry up to 50 amps individually, resulting in a total capacity of 50 amps per leg.

Why does the run capacitor have a lower MFD rating than the start capacitor?

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Asked by Wiki User

The run capacitor is designed to maintain a steady voltage supply to the motor while it's running, so it requires a lower capacitance value. In contrast, the start capacitor provides an additional boost to initiate the motor's rotation, requiring a higher capacitance value to deliver the necessary power during startup.

What is a difference between ground fault and earth fault?

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Asked by Wiki User

  • An earth fault relay and an overcurrent relay are both protective devices used in electrical systems, but they serve different purposes and operate based on different principles. Here are the key differences:Function:Earth Fault Relay: Detects ground (earth) faults, which occur when a live conductor comes into contact with the earth or a grounded component. Its primary function is to sense leakage currents to the ground and trip the circuit breaker to prevent damage or hazards.Overcurrent Relay: Detects overcurrent conditions, which occur when the current exceeds the rated capacity of the circuit. This could be due to overloads or short circuits. Its primary function is to protect the electrical system from excessive current that can cause overheating and damage.Detection Method:Earth Fault Relay: Typically uses a zero-sequence current transformer (CT) or residual connection method to measure the imbalance between phase currents, which indicates a ground fault.Overcurrent Relay: Uses current transformers (CTs) to measure the current in each phase and operates when the current exceeds a predetermined threshold.Sensitivity:Earth Fault Relay: More sensitive to small currents, as earth faults often involve low fault currents compared to phase-to-phase faults.Overcurrent Relay: Designed to detect larger currents that exceed the normal operating range of the circuit.Applications:Earth Fault Relay: Commonly used in systems where protection against ground faults is critical, such as in power distribution networks, industrial installations, and consumer units.Overcurrent Relay: Widely used in protecting transformers, motors, generators, and feeders from overcurrent conditions.Configuration:Earth Fault Relay: Usually configured to operate at a lower current setting due to the nature of ground faults.Overcurrent Relay: Configured based on the normal operating current of the circuit and its protection requirements, usually at a higher current setting than earth fault relays.In summary, while both relays are crucial for system protection, an earth fault relay focuses on detecting and isolating ground faults, whereas an overcurrent relay protects against excessive current conditions that can damage equipment and cause safety hazards.

What is diffence between ac volt?

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Asked by Wiki User

AC voltage refers to alternating current voltage, which changes direction periodically. This type of voltage is commonly used in household electrical outlets. On the other hand, DC voltage stands for direct current voltage, which flows in only one direction. This type of voltage is often used in batteries and electronic devices that require a constant power source.

Why do you step up and then step down electricity from a power station?

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Asked by Wiki User

Electricity is stepped up at power stations for efficient long-distance transmission, as higher voltage reduces energy loss during the journey. When reaching a local distribution point, electricity is stepped down to safer levels for household use. This step-down process ensures that the electricity supplied to homes and businesses is at a voltage suitable for common appliances.

What will be the load voltage if load resistance is 10 k ohm and load current is 2 ma?

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Asked by Wiki User

The load voltage can be calculated using Ohm's Law: V = I * R, where V is the voltage, I is the current, and R is the resistance. Substituting the values, V = 2 mA * 10 k ohm = 20 V. Therefore, the load voltage will be 20 volts.

What will happen if you use phase to phase voltage for a single phase device?

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Asked by Wiki User

If a single-phase device is connected to a phase-to-phase voltage, the device may get damaged due to the higher voltage applied. Single-phase devices are designed to operate at a lower voltage compared to phase-to-phase voltage levels typically found in three-phase systems. It is important to match the voltage ratings of the device with the supply voltage to prevent damage.

How does neutral missing protection work in single phase energy meter?

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Asked by Wiki User

Neutral missing protection in a single-phase energy meter detects the absence of the neutral wire in the electrical circuit. When the neutral wire is missing, it can result in overvoltage on the load side. The energy meter typically shuts off to prevent damage to the connected equipment in such a situation.

How do you change the connection of single line to 3 phase line of DC motor?

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Asked by Wiki User

To change the connection of a single-phase line to a three-phase line for a DC motor, typically you would need to use a phase converter or a variable frequency drive (VFD) to convert the power supply. This will allow you to provide the necessary three-phase power to the DC motor for it to operate efficiently and safely. It's important to consult with an electrician or engineer to ensure the proper conversion is done based on the motor specifications.

What is electrical properties of Ge and Si?

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Asked by Wiki User

Germanium (Ge) is a semiconductor with higher mobility than silicon (Si) but also has a higher intrinsic carrier concentration. Silicon is the most widely used semiconductor material due to its abundance and lower cost. Both materials can be doped to change their conductivity and have a bandgap that allows them to be used in electronic devices.

What is the meaning of single phase and three phase voltage and what actually does it represent?

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Asked by Wiki User

Single phase voltage refers to a system with one live conductor and one neutral conductor, commonly used in residential applications. Three phase voltage refers to a system with three live conductors, used in commercial and industrial applications to deliver more power with higher efficiency. Both types of voltage represent the alternating current that powers electrical equipment and devices.

What is the horsepower of a 3 phase 480 volt 1.7 amp motor?

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Asked by Wiki User

To calculate the horsepower of a motor, you can use the formula: HP = (Volts x Amps x Efficiency x Power Factor) / 746. In this case, assuming an efficiency of 0.85 and a power factor of 0.9, the horsepower of a 3-phase 480 volt 1.7 amp motor would be around 1.2 HP.

How much more efficient is a 2 hp 240 v 3 phase motor compared to a 120 v single phase 2 hp motor?

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Asked by Wiki User

A 240V 3-phase motor is generally more efficient compared to a 120V single-phase motor of the same horsepower rating because it provides smoother and more consistent power delivery. The 3-phase motor also tends to have lower operating temperatures and reduced energy losses, resulting in higher efficiency and better performance overall.

How do you connect a 460v 3 phase to a 220v pump?

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Asked by Wiki User

You would need to use a step-down transformer to reduce the voltage from 460V to 220V. Make sure the transformer is rated for the appropriate power and phase requirements of your pump. Consult with a qualified electrician to ensure the proper installation and safety.

What will the voltage drop on a 1.5 mm cable run 1.5 kilometres be?

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Asked by Wiki User

The voltage drop on a 1.5 mm cable run of 1.5 kilometers will depend on factors such as the current flowing through the cable, the material of the cable, and the temperature. Typically, to calculate voltage drop, you can use the formula: Voltage drop = (2 x current x length x resistance) / cross-sectional area.