OLR Setting का कन्फ्यूजन खत्म! 10A मोटर पर 5.8A Setting क्यों? @ElectricalTechnician

Friends, you will be asked a question in the interview It will be stated that you have a motor. The current rating of that motor is 10 amperes. And you will be told that the overload relay, which is this There can be two settings in an overload relay; the first setting No more, no less.的一种设置，这个设置在哪里？ How will you do it, and why are you setting it up that way? Hey, tell me this—so many people here give this answer When the main motor is operated, it draws a current of 10 amperes. So, the setting we will configure will also be our 10 ampere setting. We cannot set it this low. But it is precisely there that they fail. Because this overload relay also has such a condition Where you will need to set this up Even though the motor is not drawing 10 amperes of current And you will also receive proper protection in it. How do we set this up? Let's go ahead then. We will explain it in full detail, step by step. First of all, understand this: whenever you need to set the motor So, on the motor's nameplate, you need to look for the amperes. What is written in front of Empire 52 amperes, as written here According to this, you This is where the setting should be done. What is in the starter is our current one. The current goes through this MCB. The motor will go through the entire overload relay. Now, if we need to set it up here So, what will happen in this condition? The current flowing here goes to the motor. It will all pass through this overload relay. So if it says 52 amperes on our motor So the setting we will make here will also be our 52 ampere. I mean, we set the FLC to 100% here. You can set it to 95% here, or alternatively, you can set it to 90% as well. If you are watching the motor at the time it is being run The current here is much lower than the current that exists. Then, when you set this up Otherwise, you'd have to set it to 100% here. Now, if you connect this motor here in star You are running it through the delta starter. So you see, the overload relay that is there It is mounted below the main contactor. If you install the overload relay below the main contactor, won't you? It is here that the story changes. And the question that was asked to you during the interview It is related to this as well. How do I explain it? First of all, please understand this that motor we have here At the time to start this motor When we start it at the beginning First of all, our star contactor gets turned on. And as soon as it is switched on, our main contactor turns on. And if the motor runs in our star connection In this condition, the power supply will go from the MCB to our main contactor. And from the main contactor to the overload relay And the power supply will go from the overload relay to our motor. On this side, our motor, which is connected in star configuration So due to connecting in Star, the whole The current will go through this overload relay. So, in this condition, what will our setting here be? FLC's 100%, but that's where the story changes You know that in a star-delta starter, the motor remains in the star connection only until we keep it engaged until our motor reaches 70-80% rpm As soon as the motor reaches 80%, we star here The delta contactor must be turned on after turning off the contactor. And as soon as you switch on the delta contactor So, the current that exists will also flow from here. And flow will also go from here. I mean, in this motor, the terminals U1, V1, W1 located here The power supply will pass through this overload relay. But the other side of this motor, which is U2, V2, and W2 In this side, the power supply comes through the power supply delta contactor. I mean, the one winding of our motor Phase must also be assigned to this winding here. A phase must also be provided here If we give the R phase here Here we need to provide the Y phase I mean, this winding requires 415 volts of power. So a power supply is right here through the main contactor The power supply will be turned off due to overload. The second one has directly come here I mean, if you're here at this place You'll connect the clamp meter here. If you're measuring, know that 10 amperes to run this motor Current is flowing through it. In the condition where you are here It is currently running in delta here. will be measured here at that time When you do it, you will get only 5.8 amperes here. 5.8 Where does ampere come from? It's a simple calculation. What do you need to do? Multiply this current, which is your main current here, by root 3 here. Divide by the square root of 3 What will happen with 10 divided by 1.732 and divide it If you do it, the answer will be here. 5.8 amperes will be obtained So this 5.8 ampere That current is here to see you right here It gets current if from this place The flow is only 5.8 amperes. So in this condition The setting of your overload relay is also here. Only 5.8 amperes will be required I mean, the FLC written on your motor's nameplate You have to divide it by root 3. And after dividing by root 3, the answer that will come You have to set it in this overload relay. Now, in some overload relays, you'll notice that the overload relay is not We also connect it at the delta point if such a connection is made. will go, then even in this condition, our overload relay here in this The setting will also be divided here by root 3. I mean, if you multiply 58% root 3 here by the FLC, then It will have to be done now, friends, right here You will surely have a doubt in your mind. The doubt is that if we At the time of starting this motor When turning on, at the time of turning on We have seen that our presence here Star contactor is happening And main with star contactor The contactor is operating, and at this moment What is the total current flowing here? I mean the 100% current one that exists Flow is coming from here So if I am in this overload relay The setting here is I will pay only 58% tax So is our overload relay here Will it happen, yes or no? And yes, then why? Otherwise, then why? Please let me know the answer by commenting in the comment box. Before telling you the answer, I would like to inform you that if you The electrical knowledge that you have, you want to take it step by step, right? Starting from the most basic, from the absolute zero level, understanding even the tiniest, smallest concept If you want to acquire knowledge at an engineer level, at a good level For this, you can get the electrical technician app from the Play Store. Download it and log in inside it After logging in, you will be here as an electrician You will get an engineering class; please join this class. This class is a completely basic class where we will teach you the fundamentals. We start teaching from zero level. and gradually increasing the level, the engineer Let's take it to the next level and wrap it up. If you have been working in the industry for two or three years, If nobody teaches you, then this class will be the best for you. Besides this, if you wish to learn about VFDs Then you'll get its class PLC programming If you want to learn, you'll find the class. Moreover, if you know how to read electrical panel drawings You want the LT panel, ST panel, AC circuit, and so on. How to read that drawing which is a drawing How to troubleshoot by looking at a drawing If you all want to learn all these, then join the drawing class. The best, most advanced class is here—join it now. If you want to learn panel wiring, then besides this But if you want to learn PLC programming, you'll get the class. You'll get the class if you want to learn house wiring, then house wiring The class will be held; apart from this, all the topics of electrical engineering that exist We have classes available related to these topics, which you can access directly. You can join and learn. If you need to join the class, go now. You will find the electrical technician app on the Play Store there. Please install the app and join the class from there if you have If you need any information about the class, feel free to ask me personally. The WhatsApp number given here is 8989044606. This is my WhatsApp. It's a WhatsApp number; you can contact me on this number. So where should it be placed? Let's see, if you're a star When making a star delta starter, use a star delta starter. Do not install the overload relay below the main contactor. Nor should you place it below the delta connector here. Because if your main contactor is located here below What will happen here under these conditions? We'll have to lower the setting. plus some current will flow from this side We do not receive protection from this side. The second thing, if we connect this overload relay here in delta So in the star connection, when the motor runs So at that time, we do not receive protection. The best way would be for your overload relay Connect this overload relay in the main circuit here. I mean, the power supply will go to your overload relay first. Then the power supply comes from there to your place. The main contractor And from there, loop the power will be given to Delta Contractor The benefit will be that our motor, regardless of Go to star or go to delta In both conditions, the current that we have It will pass through this overload relay. And in this overload relay, we have It needs to be set at 100%. I mean the FLC of the motor itself Here we will set it up. Now, the question we had was If we install an overload relay here Under the delta contactor Or down below the main contactor So, will we get protection at the start? Or when our overload relay We will reduce the setting. When the flow hits, it will be 100% star In connection with this condition, what is it? Our overload relay will trip. So the answer is no, because the one that is ours is the overload relay There is a class, as you will see. Here it is written CL10 on this overload relay. Yes, this means class 10 overload relay for you Moseley comes in three types, three classes. The first class will be Class Ten, the second one Class 20 and the third one is Class 30 There will be three different classes here now. What is this class? What does it mean? And Let us understand why it becomes necessary to use this. You see, our overload relay, you know, this overload How quickly will we get protection from the relay? Take the load, suppose you have in this overload relay Current setting of 10 amperes has been made So, when a current of 10A flows, how quickly will your overload relay trip? You'll have to look at the class to see him tripping. The current rating of each overload relay Six times what you have set I mean, in the setting you have here Make sure you have set it to 10A Multiply by 6 the value of that setting. Meaning, multiply by 6 So what will the answer be? 60 amperes According to this If Malo is using this overload relay Suddenly, the current flow of 60 amperes started. While you have set it only at 10 amperes So if your overload relay is the one If he is a Class 10 student here So in this condition, your overload relay Whatever it is will trip here within 10 seconds. Meaning that after 10 seconds of starting The motor that is here is going to be shut down. Similarly, if you set the same setting here to 10 amperes And you used the overload relay here, the Class 20 type. So if the current through your overload relay increases sixfold Six times the current if your start begins to flow So, your overload relay, which will trip in the minimum time It takes 20 seconds Tripping will occur here within 20 seconds in class 20. What happens in class 30? It takes 30 seconds here. Now understand this one thing: if your current one is If the current increases, then the time will decrease accordingly. And this very current, if from your overload relay, current The flow is ongoing; if it decreases, then your tripping time, which is And it will increase even more. Now, let's get to our question—the question is this We will start it, we will turn on the motor So there is also starting current, so starting How much will it be in this start connection? Three to four times, so if we take four How much would it be even if taken at 40 amperes? And suppose that here you have class You have installed the 10A overload relay. So, the overload relay for class 10 10 seconds to trip It will take place, but when will the trip happen in 10 seconds here with this current? What if it becomes six times what it is? It will be if the current here, which is 10 amperes, is multiplied by 6. It is 60 amperes of current; if the current flows, then 10 It will trip in the second, but right now how much current is flowing? Only here 40 ampere I mean our overload relay Anything that takes more than 10 seconds Going crazy and we know it when we turn on the Star Delta Starter At the time of turning on In Star Connection, the motor runs only for 5 to 7 seconds. Or suppose it takes 10 seconds for it to operate. Meaning that the motor reaches up to 80-90% of its RPM It takes you about 8-9 seconds for something So in this much time, your overload relay It won't be possible to operate here. By then, your motor will have been running in delta configuration. Meaning, the current here will decrease. Now, another question should arise in your mind here. the overload relay that is for the remaining class We've already understood the 10th class ones. After that, where should we use the 20-year-old and the 30-year-old ones? So, tell me, how much time does it take to start your motor? How long does your current start last? According to him, you have to select your class. For example, suppose your motor at the time to start the motor The current that is present lasts only for 5-6 seconds. So you're here for the Class 10 one For what purpose will you use the overload relay? For 5-6 seconds After that, the one belonging to class 20 We use it when When our motor or machine The starting current is here. It is around 15 seconds, 16 seconds I mean, our overload relay should not trip during starting. We have to increase the time for it, so we take class 20. In the same way, you start the motor by turning on the machine. The current that is yours lasts up to 20 seconds, 22 seconds, 25 seconds So for 20, 22 seconds you have here the Class 30 one An overload relay of class 30 will have to be used here. So, I hope you've now understood this through this video How much setting do we need to do in an overload relay? Friends, if you have basic electrical knowledge I want to take it from here up to the advanced level. For this, from the Play Store, electrical Please download the technician app. I hope you enjoy today's video Thank you very much for watching this video