Deepakkumar Yadav
ydeepak297@gmail.com Classification of Transmission Line Short transmission line Medium transmission line Long transmission line 1) Short transmission line Length of transmission line = below 50 km. Voltage = below 20 kV Due to smaller length and low voltage capacitance effect is neglected and only resistance and inductance is considered. 2) Medium transmission line Length of transmission … Read more
Lighting Schemes : For different purposes different lighting schemes are suggested. Types of Lighting Schemes : If the light falls on the polished surface the light is reflected back. This is good for illuminated but it produces glare on the eyes which is harmful. If light falls on the coarse surfaces like painted ceilings, frosted … Read more
What is Electrical Submetering ? Electrical submetering involves the installation power meters (also called power monitors, electrical meters, or energy monitors) that can measure energy usage after it reaches the primary utility meter. Submetering offers the ability to monitor energy usage for individual tenants, departments, pieces of equipment or other loads to account for their actual energy … Read more
Current Transformers : Q. State the specifications of CT as a protective transformer. Video :- The instrument transformers, which used in conjunction with ammeter, over current relay etc. are known as current transformers. Current transformers step down current from high value to a low value. Their current ratio is substantially constant for given range of … Read more
Melded Case Circuit Breaker (MCCB) : Molded case circuit breakers are tested and rated according to the UL489 Standard. Their current carrying parts, mechanisms and trip devices are completely contained within a molded case of insulating material. MCCBs are available in various frame sizes with various interrupting ratings for each frame size. Molded case circuit breakers are designed … Read more
Miniature circuit breaker (MCB) Actuator lever – used to manually trip and reset the circuit breaker. Also indicates the status of the circuit breaker (On or Off/tripped). Most breakers are designed so they can still trip even if the lever is held or locked in the “on” position. This is sometimes referred to as “free trip” … Read more
Air Break Circuit Breaker : Q. What are types of air circuit breakers? Draw neat sketch of one air circuit breakers and explain its working. Construction of Air Break Circuit Breaker : There are two sets of contacts. Main contacts and arcing contacts. Main contacts conduct the current in closed position of the breaker. They … Read more
Classification of Circuit Breakers : Circuit breakers can be classified by various methods however; the most general way of classification is on the basis of medium used for arc extinction. Various arc extinction medium used in circuit breakers is usually oil, air sulphur hexafluoride (SF6) or vacuum. According to above mediums, circuit breakers are classified … Read more
Methods of Arc Extinction : Q. State and explain the two different methods of arc extinction in a circuit breaker. Q. Explain the principle of arc extinction in C.B. Explain the arc phenomenon. Q. State the method of arc extinction. Q. what are the two different methods of arc extinction in circuit breakers? Explain each … Read more
Electrical Circuit Breaker Arc Formation Process : Q. What is arc formation process? Q. Define circuit breaker. Explain arcing phenomenon in circuit breaker. Arc Formation Definition : Refer Figure (a) circuit breakers contacts are in closed position. And entire cross section of conductor carries the current. Now when fault occurs on system a heavy current flows … Read more