Different Types of Relay.
Depending on the operating principle and structural features relays are of different types such
as electromagnetic relays, thermal relays, power varied relays, multi-dimensional relays,
and so on, with varied ratings, sizes and applications.
This video main aim is to give a brief idea about various relays that are employed for
a wide variety of control applications.
Some of these relays are described this video.
Electromagnetic Relays.
These relays are constructed with electrical, mechanical and magnetic components, and have
operating coil and mechanical contacts.
Therefore, when the coil gets activated by a supply system, these mechanical contacts
gets opened or closed.
DC and AC Relays.
Both AC and DC relays work on the same principle as electromagnetic induction, but the construction
is somewhat differentiated and also depends on the application for which these relays
are selected.
DC relays are employed with a freewheeling diode to de-energize the coil, and the AC
relays uses laminated cores to prevent eddy current losses.
Attraction Type Electromagnetic Relays.
These relays can work with both AC and DC supply and attract a metal bar or a piece
of metal when power is supplied to the coil.
This can be a plunger being drawn towards the solenoid or an armature being attracted
towards the poles of an electromagnet as shown in the figure.
These relays don't have any time delays so these are used for instantaneous operation.
Induction Type Relays.
These are used as protective relays in AC systems alone and are usable with DC systems.
The actuating force for contacts movement is developed by a moving conductor that may
be a disc or a cup, through the interaction of electromagnetic fluxes due to fault currents.
These are of several types like shaded pole, watt-hour and induction cup structures and
are mostly used as directional relays in power-system protection and also for high-speed switching
operation applications.
Magnetic Latching Relays.
These relays use permanent magnet or parts with a high remittance to remain the armature
at the same point as the coil is electrified when the coil power source is taken away.
Solid State Relays.
Solid State uses solid state components to perform the switching operation without moving
any parts.
Since the control energy required is much lower compared with the output power to be
controlled by this relay that results the power gain higher when compared to the electromagnetic
relays.
These are of different types: reed relay coupled SSR, transformer coupled SSR, photo-coupled
SSR, and so on.
The above figure shows a photo coupled SSR where the control signal is applied by LED
and it is detected by a photo-sensitive semiconductor device.
The output from this photo detector is used to trigger the gate of TRIAC or SCR that switches
the load.
Hybrid Relays.
These relays are composed of electromagnetic relays and electronic components.
Usually, the input part contains the electronic circuitry that performs rectification and
the other control functions, and the output part include electromagnetic relay.
Thermal Relay.
These relays are based on the effects of heat, which means - the rise in the ambient temperature
from the limit, directs the contacts to switch from one position to other.
These are mainly used in motor protection and consist of bimetallic elements like temperature
sensors as well as control elements.
Thermal overload relays are the best examples of these relays.
Reed Relay.
Reed Relays consist of a pair of magnetic strips (also called as reed) that is sealed
within a glass tube.
This reed acts as both an armature and a contact blade.
The magnetic field applied to the coil is wrapped around this tube that makes these
reeds move so that switching operation is performed.
Relays are also available with different pin configurations like 3 pin, 4 pin and 5 pin
relays.
The ways in which these relays are operated is shown in the below figure.
Switching contacts can be SPST, SPDT, DPST and DPDT types.
Some of the relays are normally open (NO) type and the other are normally closed (NC)
types.
Thanks for watching this video.
More about information of about relay, check out my video How a Relay Works?
please subscribe my channel learning Engineering.
For more infomation >> Types of Relay - Different Types of Relay - Classification of Relays - Duration: 4:46.-------------------------------------------
TI Update 12.28.16 - Duration: 30:40.
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ВСПЫШ и ЧУДО МАШИНКИ Новая серия на русском от Tyomka TV ВСПЫШ Гонки Мультик про машинки для детей - Duration: 2:25.
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SAYKOJI - LIFESAVER - Duration: 3:55.
LOST AND HELPLESS ALONE IN THE DARKNESS
GOT NOWHERE TO GO UNTIL YOU CAME ALONG
GELAP DAN SEPI TERHILANG SENDIRI KAU HADIR TUMBUHKAN HARAPAN LAGI
YOU'RE MY POWER, YOU'RE MY HOPE
YOU'RE MY LIGHT, SHINING BRIGHT
KAU KUATKU, HARAPANKU, PENUNTUN DAN CAHAYA
WE GO BETTER TOGETHER, LIKE YOU AND I FOREVER
IT'S LIKE WE'RE ONE WITH THE FORCE
LOVE IS THE ONLY ONE SOURCE
YOU CAME ALONG, YOU BRING THE LIGHT
KEEP ME IN LINE IN MY HEAD, YOU SO TIGHT
JUST LIKE A JEDI TRICKIN' ON MY MIND
BUT YOU ARE SINCERE HA, YOU MAKE ME FEEL FINE
AND I'M THANKFUL FOR WHAT YOU HAVE DONE
YOU GO ALL THE WAY
KAU TERANGKU DALAM KEGELAPAN
LIGHT UP SHOW THE WAY
YOU'RE A HERO FOR ME
YOU HAVE SET MY SOUL FREE
YOU ARE MY DESTINY
FOREVER, MY LIFESAVER
TURN IT ON LIKE A LIGHTSABER
TURN IT ON LIKE A LIGHTSABER
HAMPA SEPERTI DI ANGKASA
TANPAMU AKU TAK KUASA
BAGIKU KAU PENYAMBUNG ASA
TAK UBAHNYA PELITA DI SETIAP MASA
RASA SENANG DAN TENANG
SURAM SILAM KUKENANG
TAKKAN TERPUTUS BENANG
KASIH SEJATI KUDAKI KURENANG
AND I'M THANKFUL FOR WHAT YOU HAVE DONE
YOU GO ALL THE WAY
KAU TERANGKU DALAM KEGELAPAN
LIGHT UP SHOW THE WAY
YOU'RE A HERO FOR ME
YOU HAVE SET MY SOUL FREE
YOU ARE MY DESTINY
FOREVER MY LIFESAVER
TURN IT ON LIKE A LIGHTSABER
TURN IT ON LIKE A LIGHTSABER
TURN IT ON LIKE A LIGHTSABER
-------------------------------------------
Laila Main Laila Dance | Raees | Bollywood Choreography | #DanceLikeLaila - Duration: 1:22.
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Speed Racer 48% | Geomerty dash - Duration: 0:47.
pretty tide ship
fast cube
really fast balls
whoooooooooooooooooooooooooooooo
wait why is it going in slow motion
WAIT WHAT
-------------------------------------------
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The Metropolitan Museum's English Gallery - Duration: 5:08.
There's an astonishing amount of racy
stuff in art in a big museum like the
Metropolitan you can find almost the
whole history of human sexuality
included in the artworks and that's
what our tours are about at Shady Ladies
Tours we show you the racy side of art
in the museum from the ancient Greeks
up to the modern collection there is
even racy stuff in parts of the museum
where you really wouldn't expect it to
A great example is the Met's gallery
of English 18th century paintings I
think if you just look at it without
knowing anything you would imagine that
it's a gallery of portraits of dukes
and duchesses all of whom came from
aristocratic families and had perfect
spotless lives and that is in fact not
true at all I think that's what the
portrait painters want you to think
because these are very honorific
portraits of people who were important
but it doesn't mean they didn't have
scandalous backgrounds and I'll just tell
you that the a little tiny bit about four
of them then you can come on our tour
some time to find out a lot more fun
gallery as you walk in on the left
there's a very big portrait very grand
of a woman in a vast gold dress again
you might think she was the Duchess but
she's not at all
this is one of the most prominent
courtesans of 18th century London a
woman named Grace Dalrymple Elliot who
was the lover of a whole string of
aristocrats including for instance
the Prince of Wales the future George
the fourth she actually might have had an
illegitimate child by George the fourth
she also lived in France for about a
decade and was the lover of a cousin
Louis the 16th the Duc d' OrlŽans who was
a very interesting person in history
because he became a
revolutionary if you look right across
the gallery from her you see a
portrait of someone who certainly is an
illegitimate royal child this is Charles
Beauclerk the Duke of St. Albans she had a long
string of titles all of which were given
to him by his father King Charles the
second but he was in fact an
illegitimate child by one of Charles's
innumerable mistresses the actress Nell Gwyn
Gwyn is probably the most
fun of all royal mistresses in history
but there's not that much really to say
about her son except that he had a
lot of children I know when people look at
him they think he's kind of metrosexual in fact
was apparently sexually very active
he had a lot of children and is the ancestor
of an enormous number of great British
aristocrats in history if you look down
at the end of the gallery
there is a very dramatic portrait of a woman
with her hair flying in the wind this is an
actress during a play her name is Elizabeth
Ferran she was in fact the most
prominent comic actress of the century in
England she wasn't a courtesan but
she was an actress with an aristocratic
patron which in eighteenth-century terms
is not very different from a courtesan
that she had in the end stroke of luck
which Grace Dalrymple didn't have which
is that yourher aristocratic patron's wife
died and he married her which
aristocrats could do in the 18th
century some people married their
mistresses I think you had to be important
enough to ride out the scandal but
apparently he felt he was and
she became the Countess of Derby just
across from her
there's another wonderful portrait of
the young officer I think I've asked
many many people what they make of his
attitude as he looks out at you poutily
some people think he's just arrogant
most I think see him instead see his
arrogance as having a kind of sexy edge
as if he were standing there saying
something like babe I know you want me
I don't in fact know anything scandalous
about him but there is something
interesting about him which is that his
sister was good friends with Jane Austen
so looking at this portrait I always
wonder if he might be the model for Willoughby one of the
great cads of English literature
anyway
there is racy stuff in lots of the
museum's galleries and you should come on
our tour and you'll find out a lot more
-------------------------------------------
ЩЕНЯЧИЙ ПАТРУЛЬ Новогодний подарок СКАЙ Развивающие мультики для детей Подарок Новый год для малыщей - Duration: 2:10.
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Shiva Untold - Love and Loss of Sati - Sadhguru - Duration: 3:01.
(Sadhguru): Shiva's love for Sati was like I was just now telling,
when we were in the Kailash trip
people became weepy about what they missed.
They didn't miss anything,
but they felt they missed.
So it's one of those moments when you yield.
So Shiva's love for Sati is just like that –
it's one of those moments where he gave in
to the ways of emotion and to the ways of life.
That was not an eventual happening in his life,
that was just a small happening in his life.
It is his silence which is of utmost significance to us.
It is his silence which is of greatest value to us,
not his romance,
not his marriage,
not his wife's death –
not these things.
But how to talk about his silence? (Laughs)
There is no way to talk about his silence.
now that you have brought up the question. (Laughs)
Yes,
he went through all the throes of
romance and the death and the grief and the works.
But the moment he set it down, he simply sat there still, unmoved,
as if nothing had ever happened to him… nothing...
nothing had happened to him at all.
And in fact nothing had happened to him,
and nothing happens to anybody for that matter.
It is just that because
our psychological and emotional structures are such that
it is designed for us to enjoy the juice of life.
But unfortunately most people don't drink the juice of life,
they drown in the juice of life.
So Shiva also allowed himself that luxury from some moment.
When he thought it's enough,
he came out of it and sat there completely conscious
and in a different state.
So don't ever think that was the eventual happening.
That was just a small happening in his life and that was fine.
That made him kind of more human friendly
because people could relate to him
because he also grieved. (Laughs)
That gives some joy to all the people who are in different levels of misery,
that Shiva also suffered for a certain period of time.
But you need to understand it's just one of those moments
when he has given into the process of life.
But the moment he wants to stop it, he stops it immediately
and sits there untouched by any of these things.
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