Relays in industry and home aplycations

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Introduction to :

Relays

Relays

A relay is an electrically operated switch. Many relays

use an electromagnet to mechanically operate a

switch, but other operating principles are also used,

such as solid-state relays. Relays are used where it is

necessary to control a circuit by a low-power signal.

There are many different types of valves that are found in different industries and applications are as Below:

Differetial relays Differential protection relays

Power relays Electromechanical relays

Time delay relays PCB power relays

Digital relays

Safety relays

Monitoring relays

D i f f e r e n t i a l r e l a y s

Differential relays are types of relays used to check the difference in terms of input and output currents for a given power system in terms of the phase angle or magnitude of the current measured. Differential relays can take a number of forms depending on the type of equipment that they are protecting.

Power re lays

Power relays are electrically operated

switches that use electromagnetic coils to

aid in closing or opening a current circuit.

Power relays are made up of amateurs,

springs and one or more contacts. Power

relays designed to open when electric

current is applied have an electromagnet

that attracts the amateur pulling the

amateur in the coil's direction until it

reaches the contact hence closing the

circuit.

T i m e d e l a y r e l a y s Time delay relays are special- purpose relays also referred to as logic components that have some characteristics of both timers and relays integrated to regulate current in electrical circuits. These types of electrical switches are arranged for an intentional delay in operating their contacts ensuring they are only used in specific time frames. Time delay relays normally stay on for a specific amount of time when activated and are switched off when the time finally elapses. Operators have the ability to adjust the delay time simply by turning a knob to the required time frame.

D i g i t a l r e l a y s

Wikipedia the free encyclopedia defines digital

relays are types of electrical safety switches that

use binary digit mechanisms such as micro-

controllers with software based algorithms for the

detection of electrical faults. Digital relays can

also be referred to as microprocessor type

protective relays by their manufacturers.

Digital relays have analogue to digital converters

that convert the measured analogue quantities to

implement the most suitable protection algorithm.

Safety relays

These are types of electrical switches that check and monitors a safety system allowing the machine to start or execute commands open the circuit hence stopping the machine when faced with potential danger.

Single function safety relays are used in smaller machines where a dedicated logic device is needed to complete the safety function due to their economical use.

Monitoring relays

Monitoring relays are electrical switches whose main purpose is to monitor balanced or imbalanced supplies of wire loads powered by generators, uninterrupted power supplies, stabilizers, inverters and electric boards.

Monitoring relays are required in electric switch-gear technologies.

Differential protection relays

These types of electrical switches are found in electrical power transformers rated more than 5MVA. They are able to detect faults occurring in transformers inside the insulating oil responding to the faults hence providing the appropriate reflex action. Differential protection relays are meant to prevent the arising of differences between the input or output currents in the transformers hence ensuring there is no short circuiting or rise in electric voltage.

Electromechanical relays

These are electrical switching devices that complete or interrupt an electrical circuit via opening or closing the circuit by physically moving electrical contacts into contact or away from each other.

These switches are electrically operated to isolate circuits or batteries, detects faults or malfunctions in transmission and distribution lines as well as controlling high powered circuits using low powered electrical circuits.

PCB power relays

Printed circuit board power relays are electrical switching devices used for high power and low level applications that mainly require the use of printed circuit board assembly. They are mainly used in applications that require relatively smaller relays making PCB mounting practical and relatively easy.

PCB power relays normally use either electromagnetic PCB relays or Reed relays in their magnetic craft ranges.

VALVES

Contact details : VISUM Ltd. Letna 40 040 01 Kosice Slovakia - E.U.

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