Relay and Circuit Breaker Working | Operation Explained with Animation

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English

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Hindi

Variant 1

Posted on: Jan 17, 2025

Video by: Pranab's Lab

Learn about the working of relays and circuit breakers through animated visuals. Follow step-by-step diagrams to understand how these components play a crucial role in system operations.

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0:01

Hello friends, welcome to my lab.

0:03

In this video, I will show you the basic operation of a relay and circuit breaker in a power

0:08

system.

0:10

If you love my video, please like it and don't forget to subscribe and share with your friends.

0:14

Let's switch on.

0:20

So let's draw the circuit diagram step by step.

0:23

First of all, an outgoing line of any system voltage is taken from a busbar.

0:28

You can see a gap is placed in between the lines and we will put a switch in that position

0:35

later.

0:37

Now, a CT that means current transformer is placed in that line.

0:42

Basically, a CT is used to perform two basic functions.

0:47

Firstly, to step down the current and measure the line current at a certain ratio and secondly,

0:53

it works as a sensing element of a relay.

0:56

way. In the figure you can see the CD secondary

1:00

terminals are connected with a relay coil. In between the relay coil a soft iron plunger

1:06

is placed which is electrically isolated from the coil. Electrically isolated means no current

1:13

will flow between the relay coil and that iron plunger. Now when the relay coil is energized

1:20

that means magnetized then the iron plunger will be attracted and when the relay coil

1:26

will be de-energized that means demagnetized then the iron plunger will be released.

1:34

Just like this.

1:43

Now you can see a separate circuit is drawn just above the relay coil plunger.

1:49

This circuit is called the trip circuit.

1:52

The circuit contains a DC power supply from battery, a trip coil and two contacts.

1:59

The contacts

2:00

are placed just below the relay coil plunger. The trip circuit can be closed

2:05

only by the relay coil plunger. Please remember that the trip circuit

2:10

contacts are normally in open condition. Now you can see a separate plunger is

2:18

placed between the trip coil just like the relay coil plunger and it can

2:23

control the opening and closing of the main line contacts. Please remember that

2:30

the trip coil contacts are in normally closed condition.

2:34

And this is the part which is called the circuit breaker of the system, which helps to break

2:40

the circuit in abnormal condition.

2:44

Our diagram is done, now let's discuss the operation of it.

2:49

Assume that normal current is flowing through the line from the busbar.

2:54

As a result, a small amount of current is flowing through the CT and relay coil.

3:01

Then the magnetizing power of the relay coil is very low to attract the relay coil plunger.

3:12

This is the normal condition.

3:14

Now let's assume a fault is occurred in the line.

3:19

As a result a huge amount of current will be flowed from the busbar to the line.

3:26

And according to the CT ratio it will also carry a large amount of current from the CT to the relay coil.

3:34

With the increase of the CT current, the magnetizing power of the relay is also increased and it

3:40

attracts the plunger.

3:44

The plunger will close the trip circuit and a current will be flowed through the trip

3:49

coil.

3:52

By flowing normal current through the trip coil, it gets energized.

3:57

As a result, the trip coil plunger will be attracted.

4:00

And finally the circuit is opened with the opening of the circuit breaker.

4:04

As a result the CT and relay coil will sense no current.

4:09

Then the relay coil is de-energized and it releases the plunger.

4:13

Then no current flows through the trip circuit and the trip coil is de-energized and the

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Video Transcript

0:00

हेलो हेलो फ्रेंड्स वेलकम टू माई लें अब

0:03

इन दिस वीडियो आई विल शो यू ऑल द बेस्ट

0:05

कॉर्पोरेशन ऑफ रियल एंड सॉफ्टवेयर इन थे

0:08

व्होल सिस्टम यू

0:10

तो इसे लाइक माय वीडियोस प्लीज लाइक इट

0:12

एंड डोंट फॉरगेट टो सब्सक्राइब एंड शेयर

0:13

विद योर फ्रेंड्स लेट्स स्विच ऑन ए

0:20

थे सोले आफ बडौदा सर्किट डायग्राम स्टेप

0:22

बाय स्टेप फर्स्ट आफ ऑल एंड आउटगोइंग लाइन

0:26

आफ एनी सिस्टम होल्डर जिस टेकन फ्रॉम इस

0:28

बार यू कैन सी योर पीस प्लेस इन बिटवीन द

0:32

लाइंस एंड विल पुट ए स्विच इन थे पजेशन

0:36

लेटर नाउ ऐसी टीचर मींस कारण ट्रांसफार्मर

0:40

इस प्लेस इन द फ्लाइंग बेसिकली एसिड इस

0:44

यूज्ड टो परफॉर्म टू बेसिक फंक्शंस फर्स्ट

0:47

लु टो स्टेप डाउन द करंट एंड मेजर द लाइन

0:51

करंट ऐड्रेस ठाट अनलेस योर एंड सेकेंड्ली

0:53

आईटी वर्क्स एसएन सिंह एलिमेंट आफ

0:56

एग्ज़ीले इन द फिगर यू कैन सी द विड्थ हिम

1:00

ऑफिसर कनेक्टेड विद थे रिलैक्स ऑयल इन

1:04

थ्रिलर कोयल यह सॉफ्टवेयर ऑनलाइन ज थिस

1:07

प्लेस कोई चीज इलेक्ट्रिकली आइसोलेटेड

1:09

फ्रॉम द रॉयल इलेक्ट्रिकल आइसोलेटेड मींस

1:12

नो कंट्रोल ओं बिटवीन रिलैक्स यौन ट्राउजर

1:17

नाउ इन थ्री बॉयज

1:20

वसुंधरा इज 20 आयरन प्लांट जरूर बे

1:24

अट्रैक्टेड एंड विन थ्रिलिंग ड्रॉ ऑयल

1:27

बीडीए थर्ड थर्ड इन थे राइज इन थे विलेज

1:32

ओं

1:34

मैं जस्ट लाइक दिस ए

1:43

कि नाव यू कैन सी ए सेपरेट सर कि ड्रॉन

1:46

जस्ट एवं द रिलैक्स फील प्लेजर दिशा कि

1:49

डिस्कवर्ड द ट्रिप सर्किट 10 पॉकेट कंटेंट

1:53

एंड डीसी पावर सप्लाई फ्रॉम बैटरी एक

1:56

स्ट्रिप कोयल एंड टू कॉन्टैक्ट्स द

2:00

कॉन्टैक्ट्स ओर प्लेज़ेंट बिल उधर

2:02

इलेक्ट्रॉनिक संजय दत्त सर्किट कैन बे

2:05

क्लोज ओनली बाय धरिला कालिंजर प्लीज

2:08

रिमेंबर टीशर्ट कॉन्टैक्ट्स आफ नॉरमल इन

2:12

अप एंड कंडीशन हैं

2:14

कि नाव यू कैन सी ए सेपरेट लाइंस आफ थिस

2:18

प्लेस बिटवीन द ट्रिप कोयल त्यौंथर एंड

2:23

कैन कंट्रोल ओपनिंग एंड क्लोजिंग ऑफ द मेन

2:26

लाइन कॉन्टैक्ट्स प्लीज रिमेंबर ट्रिपल

2:31

कॉन्टैक्ट्स कॉइन और मौलिक सोच कंडीशन एंड

2:35

दिस इज द व्हाट इज कॉल्ड द सब्सक्राइब टो

2:44

कि अवॉर्ड्स डन नऊ लेट्स डिसकस द पर्सन

2:47

फिट एग्जाम डेट नार्मल कारण डिसप्लेइंग

2:51

सुंदर लाइन फ्रॉम द ब्रिज बार ऐसे रिजल्ट

2:56

ए स्मॉल अमाउंट आफ करंट इस पॉइंट टू द

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