Table of Contents
What is the purpose of low-voltage protection?
There are low-voltage protection (LVP), low-voltage release (LVR), and low-voltage release effect (LVRE) controllers. The main purpose of an LVP controller is to de-energize the motor in a low voltage condition and keep it from re-starting automatically upon return of normal voltage (Below Figure).
What does under voltage protection mean?
Definition of undervoltage protection : the protection of a circuit by an automatic device against operation on reduced voltage.
Is a manual starter an example of low-voltage protection?
Low Voltage Protection (LVP), which prevents automatic restarting of equipment after a power failure, is usually not possible with a manual starter. This means, if the power fails, the power contacts remain closed (toggle or button in ON position). The other main type of starter is the AC magnetic motor starter.
What is a 52 relay?
52 AC circuit breaker A device that is used to close and interrupt an AC power circuit under normal conditions or to interrupt this circuit under fault or emergency conditions.
How many types of stators are there?
Stator of Three Phase Induction Motor The stator of the three phase induction motor consists of three main parts: Stator frame. Stator core. Stator winding or field winding.
What is an 83 relay?
83 – Automatic Selective Control or Transfer. Relay. 84 – Operating Mechanism. 85 – Pilot Communications, Carrier or Pilot- Wire Relay.
What is a 47 relay?
The 47 relay is on 4.16KV MCB that feeds a line up of 4.16KV feeder breakers, that in turn provide cables underground to building transformers. The original purpose of this relay (I am told) was to protect the motors on site from phase loss, and/or, reverse phase rotation.
How do stators work?
The stator is the coil of wire housed inside the engine case. A magnet on a shaft spins within the stator, creating alternating current (AC). That current travels along fairly heavy gauge wire through the case and into the rectifier/regulator which converts it to DC power, and at a consistent output.
What are stators made of?
The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.5 millimetre. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors.
Which motor is never started on no load?
This can be seen from the speed-armature current and the speed-torque characteristics that on low armature current and low torque condition motor shows a tendency to rotate with dangerously high speed. This is the reason why series motor should never be started on light loads or no load conditions.