Polyphase AC Motors: Synchronous and Induction
Polyphase AC Motors
Two basic types are designed to operate polyphase AC motors: synchronous motors and induction motors.
Synchronous Motors
The synchronous motor is essentially a three-phase alternator that works in reverse. The field magnets are mounted on a rotor and are excited by direct current. The armature coils are divided into three parts with three-phase alternating current. The variation of the three waves of current in the armature reaction causes a variable magnetic field, making the field
Read MoreTransformers: Types, Applications, and Measurement Techniques
Why are the grounded side of the transformers?
A: It gets to the secondary grounding that will preclude any dangerous situation in case of a discharge from primary to secondary.
Why not be shorted transformer secondary Measurement of tension?
A: Because currents circulate very intense that may damage the transformer. So when disassembling the measuring instrument should not be shorting the secondary of voltage transformer unit.
What is used transformers?
A: For that high-voltage networks isolate the
Read MoreUninterruptible Power Supply (UPS) Systems
Uninterruptible Power Supply (UPS)
What is a UPS?
A UPS provides emergency power to connected devices during a power outage. It also improves power quality, protecting against surges, spikes, and other electrical disturbances. UPS systems are crucial for “critical load” equipment, such as medical devices and industrial machinery, preventing data loss and equipment damage due to power failures.
Network Problems
- Blackout: Complete loss of power due to events like lightning strikes or excessive demand.
Computer Mouse: History, Types, and Connectivity
The Computer Mouse: A Historical Overview
Early Designs
The first computer mouse, patented as the “XY Position Indicator for a Display System,” was constructed from wood. Its cobblestone-like design featured two metal wheels for controlling cursor movement on two axes (vertical and horizontal) and a red button on top. Despite its archaic appearance, the fundamental operating principles remain the same today.
Mechanical Mice
Mechanical mice utilize a large plastic or rubber multi-layered base. Two
Pressure and Temperature Measurement Instruments
Pressure Gauges
A gauge is an instrument used for measuring fluid pressure, typically the difference between fluid pressure and local mechanical pressure. Pressure is defined as the force per unit area exerted by a liquid or gas perpendicular to a surface.
U-Tube Manometer
 | Pressure gauges are instruments designed to measure pressure. A traditional method for accurate pressure measurement involves a U-shaped glass tube containing a liquid of known density. Mercury is commonly used for high-pressure |
Industrial Automation: Control, Switching, and Protection Devices
Automatism is a system that controls a single machine or production process, reducing human intervention. Commonly used devices include sectioning, switching, and protection devices.
Sectioning Devices: These isolate a part of the network electrically for maintenance. Examples include disconnectors, switches, and circuit breakers or contactors.
Switching Devices: These establish or interrupt the power supply to receptors automatically or remotely. Examples include electromagnetic contactors, relays,
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