Circuit Breaker - Types of Circuit Breaker - Different Types of Circuit ...

Circuit Breaker - Types of Circuit Breaker - Different Types of Circuit Breakers A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit or in no load condition. In this video, I will going to show you Different types of circuit Breakers. 

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Manual Call Points

 A ‘Manual Call Point’ is a device which enables personnel to raise an alarm in the event of a fire
 incident by pressing a frangible element to activate the alarm system.

Manual Call Points should be installed at a height of 1.2m above floor level at easily accessible, conspicuous positions, on exit routes, at the entry floor landings of staircases and at all exits to the open air.

Manual Call Points should be spaced so that one may always be found within a maximum distance of 45m apart or 25m for disabled person.

What are the Most Popular PLC Programming Languages?

There are 5 languages that are all a part of the IEC (International Electrotechnical Commission) Section 61131-3 Standard. This IEC Standard allows some ground rules that standardize PLC’s and their languages. The 5 most popular PLC programming languages are Ladder Diagram (LD), Sequential Function Charts (SFC), Function Block Diagram (FBD), Structured Text (ST), and Instruction List (IL). Let’s take a deeper look into all these PLC Programming Languages.

Once you learn ST, you will never use another language. It is a little difficult to learn if you are not familiar with programming in c or pascal, however once you get it, you can make the same thing like other languages but using just a few lines of code. You can create really complex algorithms, such as advanced PID control, stepper/servo motion control using matrix theory for driving several axis simultaneously (widely used for robotics), manouver variables directly in word data type (memory level) saving cycle time when running big programs, you can read and write data directly from protocol ports (ethercat, modbus, profinet etc), not to mention the integration with image systems. you are not limited to the manufacturer's library and function blocks. You will have the power to modify and create new function blocks based in your needs, edit libraries etc.. You can make things that are impossible in other plc languages. If you are starting to learn PLC and your goal is to become a pro, go for ST language and you will not regret. Other languages like ladder are good for electricians due the way it is written, it is pretty simple and easy for first steps, but as soon you need something more complex such data analysis, dinamic control or advanced motion control, these languages are not good

DIODES

DIODES
Power diodes provide uncontrolled rectification of power and are used in applications such
as electroplating, anodizing, battery charging, welding, power supplies (de and ac), and variablefrequency
drives. They are also used in feedback and the freewheeling functions of converters
and snubbers. A typical power diode has P-1-N structure, that is, it is a P-N junction with a nearintrinsic
semiconductor layer (!-layer) in the middle to sustain reverse voltage.
Figure 1.1 shows the diode symbol and its volt-ampere characteristics. In the forwardbiased
condition, the diode can be represented by a junction offset drop and a series-equivalent
resistance that gives a positive slope in the V-1 characteristics. The typical forward conduction
drop is 1.0 V. This drop will cause conduction loss, and the device must be cooled by the
appropriate heat sink to limit the junction temperature. In the reverse-biased condition, a small

Figure 1.2 Turn-off switching characteristics of a diode
leakage current tlows due to minority carriers, which gradually increase with voltage. If the
reverse voltage exceeds a threshold value, called the breakdown voltage, the device goes through
avalanche breakdown, which is when reverse current becomes large and the diode is destroyed
by heating due to large power dissipation in the junction.
The turn-otT voltage and current characteristics as functions of time, which arc indicated in
Figure 1.2, are particularly important for a diode. In the forward high-conduction region. the
conduction drop (V F) is small, as mentioned before. At this condition. the P and N regions near
the junction and the !-layer remain saturated with minority carriers.
If the device is open-circuited, the carriers die by a recombination process. which takes a
reasonably long time. Normally, a reverse de voltage (V Rl is applied to turn off the device. as
indicated in Figure 1.2. At timet= 0, the reverse voltage is applied when the current goes down
linearly because of series-circuit inductance. During time t2, the current is negative and the
minority carriers sweep out across the junction, but the excess carrier concentration keeps the
junction saturated, and therefore, the same negative current slope is maintained.

ល្បិចទន្ទេញជីវវិទ្យាងាយចាំបំផុត

ល្បិចទន្ទេញជីវវិទ្យាងាយចាំបំផុត
 ១/. ប្រមូលសំណួរចម្លើយពីក្នុងសៀវភៅ និងវិញ្ញាសាផ្សេងៗដាក់ម្ដុំ
 ២/. ស្រង់សំណួរសុទ្ធតាមមេរៀននីមួយៗឱ្យអស់
៣/. កុំព្យាយាមទន្ទេញនៅក្នុងសៀវភៅមេរៀន តែត្រូវទន្ទេញសំណួរចម្លើយដែលយើងបានស្រង់មក
៤/. ពេលចាំអស់ហើយត្រូវសួរសំណួរ និងរកចម្លើយដោយខ្លួនឯង(កុំមើលក្រដាសឬសៀវភៅ)
៥/. ត្រូវទន្ទេញទាំងសំណួរ និងចម្លើយ(ព្រោះពេលខ្លះអ្នកចេះតែឆ្លើយ មិនដឹងថាសំណួរគេសួររបៀបម៉េច)

៦/. ថតសម្លេងរបស់អ្នកទុកស្ដាប់នៅពេលទំនេរ
៧/. មើលវីដេអូ ឬរូបភាពឱ្យបានច្រើន
៨/. ចូលរួមសកម្មភាពទន្ទេញមេរៀន និងធ្វើលំហាត់ជាមួយមិត្តភក្ដិ(ហាមស៊ីត្រាវ)
៩/. ព្យាយាមមើលរូបភាពហើយពន្យល់ទើបឆាប់ចាំ និងមិនចេះភ្លេច
១០/.ឧស្សាហ៍ធ្វើត្តេសខ្លួនឯងឡើងវិញលើមេរៀនដែលបានទន្ទេញរួច(ព្រោះពេលខ្លះទន្ទេញមិនបាន១នាទីផងភ្លេចទៅវិញក៏មាន)
១១/. កុំទន្ទេញលោភពេក ចុងក្រោយអត់ចាំសូម្បីតែ១សំណួរ
អត្ថបទ៖ សយ ចាន់ដេង
#Idolអ្នកបន្តវេន#

Fundamentals of Power Electronics - Buck Converter Basics

Here, we introduce the buck converter topology and it's two switching operation modes. We derive the relationship between the input voltage, average output voltage, and active switch duty ratio. I recommend to explain the basic operation including current direction flows in a simple explanation of buck converters, first, before explaining formulas.

If the input voltage is variable but the output voltage is desired to be a constant lower value can a controller be setup to control the duty cycle of that switch to hold the output voltage at the desired level? your diagram shows the inductor after the MOSFET, but other discussions on buck converters indicate the inductor prior to the MOSFET. I wonder what your thoughts are on this difference? When referring to iL I presume that you are talking about only the ripple current through the inductor and not load current as well Holy crap thanks for this video! None of the other SMPS videos I could find actually bothered to explain the theory behind how these work at a basic level. This was super helpful and I'm assuming the boost converter video will be equally edifying. So I want to use a buck converter to regulate a DC TV. Every-time a load is added it disturbs the TV. I am not considering a linear regulator as they are inefficient. I have the following questions: 1. Is Vo almost constant since Vo == Vc? 2. Are buck converters suitable for regulating sensitive electronics like TV's and computers?

THREE PHASE(3-Q) AC TO DC CONVERTER USING THYRISTOR BY MATLAB SIMULATION

Three phase ac to dc converter using thyristor by matlab simulation with RL load ; R=10 OHMS AND L=0.01 HENRY Earlier time thyristor Bridge rectifiers are employed to obtain dc regulated voltage from ac main. These rectifiers pollute the utility with low -order harmonics, which are difficult to filter . The continuous use of thyristor Bridge rectifiers injects current harmonic components into the power grid and increases reactive power demands and power system voltage fluctuations. Harmonic current components create several problems like Increase in power system losses. Oscillatory torques in rotating machinery.

Significant interference with communication circuits that share common right-of-ways with AC power circuits, Overheating and insulator failures in transformers, rotating machinery, conductor and cables. Generates noise on regulating and control circuits causing erroneous operation of such equipment. Reactive power burden, low system efficiency, poor power factor, system unbalance and causes excessive neutral currents. Malfunctioning of the protective relays and untimely tripping, Failure of capacit

What is a Transformer And How Do They Work?

A SIMPLE explanation for how a transformer works. This tutorial covers the working principle of a transformer. You can learn more about transformers here: https://www.electrical4u.com/what-is-... Comment below with any additional questions you have. If you enjoyed this video on transformers and want to see more like it, please LIKE and SUBSCRIBE to our Youtube channel.

Does the secondary coil cut the alternating magnetic field? Is that why the secondary coil has induced voltage? does it mean that we can simply use a 220v→12v transformer as a 12v→220v one? Very nice explanation. We are hoping to get more such superb videos from you relevant to Electrical & Electronics field. You did a comprehensive job. Very easy to understand !! Thank you :)

Matlab Simulation of CONTROLLED FULLWAVE RECTIFIER

scope wave show y axis line only.. there's no wave like yours....how do I fix this? I've been looking

for it everywhere. and you saved my life. thank you very much. and also do you have a instagram account.

Star and Delta Connection - Explained | TheElectricalGuy

Star/wye connection and delta connection are the two different methods which are used for connecting 3 phase system. In this video, we’ll learn in detail about star and delta connection. We’ll also know voltage and current relationship in both the connections, and where these connections are used. So, if you want to get the details, you need watch the video.

he three branches of the network are connected in such a way that it forms a closed loop known as Delta Connection. In a star connection, the starting and the finishing point ends of the three coils are connected together to a common point known as the neutral point. But in Delta connection, there is no neutral point. why the current and voltage are same or changes in y and delta connection? please let know of any links which would help me claire my doubts.

Introduction to Fire Alarm Systems 1

I'm explaining how fire alarm systems work for new technicians or other employees who deal with these systems. This is my first video in a string of many Khan Academy-styled lessons. This video introduces the basic concepts involved in the initiating circuits on a conventional fire alarm panel. Thank you so much for this.

I am starting a job as an installer in 3 days and your videos have given me so much training. Now when I show up for my first day on the job I will actually have some idea of what the boss is talking about! You are awesome man, and I really hope you do more videos. I'm only on video 12 but I am definitely going to finish the series. I just wanted to let you know how much you have helped me and how much I truly appreciate it. Addressable fire alarm panels offer a range of programming options and display important information regarding the complete fire alarm system. Analogue addressable fire alarm systems give details on individual detectors. Honeywell Morley IAS, Cooper Fire Alarm System, Reval Fire, Addressable Fire Alarm System Single Loop or Multi-Loop System available. Contact us to get the best quality multi-loop system control panel at a low price.

របបមិនប្រក្រតីរបស់សៀគ្វីអគ្គិសនី និងការការពារទល់នឹងចរន្តលើស

ការប្រើអគ្គិសនី មានធាតុសំខាន់យ៉ាងហោចណាស់៣ គឺ 

១)ប្រភពផ្ដល់ថាមពលអគ្គិសនី 

២)ឧបករណ៍ទទួលថាមពល និង បំពេញកិច្ចការសម្រាប់អ្នកប្រើ ដូចជាបញ្ចេញពន្លឺ បង្វិលម៉ាស៊ីនអ្វីមួយ(បក់កង្ហារ ម៉ាស៊ីនបោក​ -ល-) និង

៣) ខ្សែចម្លងសម្រាប់យកថាមពលពីប្រភព មក ឧបករណ៍ទទួល។

ក្នុងល.ខ.ធម្មតា និង ក្នុងការប្រើខ្សែចម្លងត្រឹមត្រូវ ការប្រើប្រាស់អគ្គិសនីមិនមានផលប៉ះពាល់អាក្រក់អ្វីទេ។ តែតាមបទពិសោធន៍នៃការប្រើប្រាស់អគ្គិសនី ការប្រើប្រាស់មិនត្រឹមត្រូវទៅតាមការកំណត់របស់អ្នកផលិតឧបករណ៍ ឬ ការប្រើឧបករណ៍ ដែលមានគុណភាពមិនគ្រប់គ្រាន់តាមស្តង់ដា ការរៀបចំសៀគ្វីអគ្គិសនីមិនស្របតាមតម្រូវការស្តង់ដាគ្រប់គ្រាន់ 

អាចនាំអោយមានភាពមិនប្រក្រតី ឬ កំហូច។ ករណីញឹកញាប់ ដែលអាចកើតមាន គឺ ការប្រើដែលនាំអោយចរន្តអគ្គិសនីកើនធំដល់កម្រិតមួយ បង្កអោយខ្សែចម្លងក្ដៅរហូតឆេះជ័រអ៊ីសូឡង់ និងទៅជាមូលហេតុនៃគ្រោះផ្សេងៗ ជាយថាហេតុ។​ ករណី២យ៉ាងនៃការកើនចរន្ត មាន 

១)ការប្រើឧបករណ៍ហួសកម្រិតអនុញ្ញាត ហៅថាលើសបន្ទុក និង 

២)សៀគ្វីមានកំហូចអ៊ីសូឡង់ ដោយមូលហេតុអ្វី១ ធ្វើអោយមានការឆ្លងចរន្ដ ក្នុងភាសាសាមញ្ញ ហៅថា ទូសសេ ។

INTRODUCTION TO CONTROLLED RECTIFIERS

Controlled rectifiers are line commutated ac to dc power converters which are
used to convert a fixed voltage, fixed frequency ac power supply into variable dc
output voltage.

Type of input: Fixed voltage, fixed frequency ac power supply.
Type of output: Variable dc output voltage
The input supply fed to a controlled rectifier is ac supply at a fixed rms
voltage and at a fixed frequency. We can obtain variable dc output voltage by using
controlled rectifiers. By employing phase controlled thyristors in the controlled
rectifier circuits we can obtain variable dc output voltage and variable dc (average)
output current by varying the trigger angle (phase angle) at which the thyristors are
triggered. We obtain a uni-directional and pulsating load current waveform, which has
a specific average value.
The thyristors are forward biased during the positive half cycle of input supply
and can be turned ON by applying suitable gate trigger pulses at the thyristor gate
leads. The thyristor current and the load current begin to flow once the thyristors are
triggered (turned ON) say at ωt =α . The load current flows when the thyristors
conduct from ωt =α to β . The output voltage across the load follows the input
supply voltage through the conducting thyristor. At ωt = β , when the load current
falls to zero, the thyristors turn off due to AC line (natural) commutation.
In some bridge controlled rectifier circuits the conducting thyristor turns off,
when the other thyristor is (other group of thyristors are) turned ON.
The thyristor remains reverse biased during the negative half cycle of input
supply. The type of commutation used in controlled rectifier circuits is referred to AC
line commutation or Natural commutation or AC phase commutation.
When the input ac supply voltage reverses and becomes negative during the
negative half cycle, the thyristor becomes reverse biased and hence turns off. There
are several types of power converters which use ac line commutation. These are
referred to as line commutated converters.

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