DTITalks
Video Chapters:
00:00 Start
00:10 Relays Model & Purpose
02:45 Relays Front & Rare View
06:50 Thank you Note
Protection System in Power System
This portion of our website covers almost everything
related to protection system in power system including standard lead and device
numbers, mode of connections at terminal strips, color codes in multi-core
cables, Dos and Don’ts in execution. It also covers principles of various power
system protection relays and schemes including special power system protection
schemes like differential relays, restricted earth fault protection, directional relays and distance relays etc. The
details of transformer protection, generator protection, transmission line
protection and protection of capacitor banks are also given. It covers almost everything
about protection of power system.
The switch-gear testing, instrument transformers
like current transformer testing, voltage or potential transformer
testing and associated protection relay are
explained in detail.
The close and trip, indication and alarm circuits different of circuit breakers are also
included and explained.
Objective of Power System Protection
The objective of power system protection is to isolate
a faulty section of electrical power system from rest of the live system so that the rest
portion can function satisfactorily without any severe damage due to fault
current.
Actually circuit breaker isolates the faulty system from rest of the healthy
system and these circuit breakers automatically open during fault condition due
to its trip signal which comes from protection relay. The main philosophy about
protection is that no protection of power system can prevent the flow of fault current through the system, it only can prevent the
continuation of flowing of fault current by quickly disconnect the short
circuit path from the system. For satisfying this quick disconnection the
protection relays should have following functional requirements.
Protection System in Power System
Let’s have a discussion on basic concept of protection system in power system and coordination of protection relays.
Basic connection of protection relay is quite simple. The secondary of current transformer is connected to the current coil of relay and secondary of voltage transformer is connected to the voltage coil of the relay. Whenever any fault occurs in the feeder circuit, proportionate secondary current of the CT will flow through the current coil of the relay due to which mmf of that coil is increased. This increased mmf is sufficient to mechanically close the normally open contact of the relay. This relay contact actually closes and completes the DC trip coil circuit and hence the trip coil is energized. The mmf of the trip coil initiates the mechanical movement of the tripping mechanism of the circuit breaker and ultimately the circuit breaker is tripped to isolate the fault.
We differentiate Protection Relay types by function:
* Overcurrent relay
* Inverse Definite Minimum Time relay
* Distance relay/Impedance relay
* Differential relay
* Directional relay
* Synchronism check relay
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ڈی ٹی آئی ، ایک پیشہ ور ٹیم جو آن لائن تربیت فراہم کرنے کے لئے کام کر رہی ہے۔ ہمارا وژن ہمارے معاشرے کے پسماندہ طبقے کے نوجوان کو ذریعہ معاش کے قابل بنانا ہے.ان کو معاش کے لیے ہنر دینا ہے. لاکھوں نوجوان ہیں جن کے پاس یہ صلاحیتیں نہیں ہیں. ہماری صنعت مہارت کی کمی سے دوچار ہے. لہذا ، ہم اس خلا کو پر کرنے کی کوشش کر رہے ہیں۔ ان لوگوں کو دنیا میں دستیاب مواقع کے حصول کے قابل بنانا ہے۔ ہم آنے والے سالوں میں منتظر ہیں کہ وہ اپنی منزل تلاش کر سکیں گے اور باوقار زندگی گزارسکیں گے
#TypesofProtectiveRelaysandDesignRequirements #Descontechnicalinstitute #DTI #ProtectionRelays #SystemProtection #Whatisrelay #RelayPurpose
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