what is afdd in electrical?
435457
Arc Fault Detection Devices (AFDDs) are devices that protect specifically against arc faults. They automatically trip a circuit when they detect dangerous electric arcs. They are compact, modular devices that are easily installed in electrical panels along with other protective equipment.
1398036
Bad diodes are a common cause of alternator failure. The diodes are part of the rectifier assembly that converts the alternator's AC output to DC. The alternator's charging output flows through six diodes in the rectifier assembly before it goes to the battery and electrical system.
153397
What is a switching diode? A switching diode is suitable for switching a small signal of up to 100 mA, acting as a rectifier. In contrast, a rectifier diode is used for AC line rectification (from alternating current to direct current). Switching diodes are designed to handle a voltage of less than tens of volts.
526689
A moulded case circuit breaker (MCCB) is a type of electrical protection device that is used to protect the electrical circuit from excessive current, which can cause overload or short circuit.
22678
An Earth-leakage circuit breaker (ELCB) is a safety device used in electrical installations with high Earth impedance to prevent shock. It detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected.
533158
AFCI protection is currently required for all 15 and 20 amp branch circuits providing power to outlets* in residential family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, and similar rooms or areas.
594063
Automatic Implantable Cardioverter Defibrillators (AICD)
1363476
DI is Digital Input which is the contact input to DCS like A contact from pressure switch, level switches etc. AI is the Analog input which is the current output from transmitters, normally 4 to 20 ma or 0 to 20ma.
749567
The VFD's Carrier (Switching) frequency is the frequency of the PWM (Pulse Width Modulation) pulses, i.e. the frequency at which the VFD's output transistors; usually IGBTs (Insulated Gate Bipolar Transistors), are switching. This typically ranges from 2 to 20 kHz.
483432
AMDD is an agile, model-driven, iterative-incremental process: Notice that there is no maintenance phase in which new features are added to the code. This is because our process iterates until the system is retired or aborted. New features can be added during any iteration.
1341015
Earth Leakage Circuit Breaker (ELCB) is a device used to directly detect currents leaking to earth from an installation and cut the power and mainly used in TT earthing systems. You are welcome to read more Important Interview Questions and MCQs.
1171407
FDD deployments provide greater coverage than TDD Mobile devices in a Frequency Division Duplexing (FDD) system transmit on a continuous basis, which enables devices to achieve cell edge rates farther from the base station.
69711
A variable frequency drive (VFD) will improve the system power factor to which it is connected, primarily because the motor reactive current is supplied by the DC bus, rather than the supply system. This will only improve the displacement power factor.
101928
Plays a critical role in preventing excess current surges during the starting of the AC motor. Dynamic Braking Resistors (DBR)– When the AC motor has to be brought to a stop, the VFD with the aid of the braking resistor acts like an electrical braking system instead of employing mechanical braking.
111215
IEC 60417-5007, the power-on symbol (line), appearing on a button or one end of a toggle switch indicates that the control places the equipment into a fully powered state. IEC 60417-5008, the power-off symbol (circle) on a button or toggle, indicates that using the control will disconnect power to the device.
1275599
A variable frequency drive (VFD) is a motor control device that protects and controls the speed of an AC induction motor. A VFD can control the speed of the motor during the start and stop cycle, as well as throughout the run cycle. VFDs are also referred to as adjustable frequency drives (AFDs).
1178453
ESD or Antistatic Safety Shoes?! Antistatic and ESD safety shoes are both conductive safety shoes. This means they protect electrical equipment by sending (conducting) electrical charges to the ground, preventing a static shock, charge or spark.