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Sunday, January 30, 2011

PowerPoint Presentation On Main Distribution Frame And Faults

PPT On Main Distribution Frame And Faults


Main Distribution Frame And Faults Presentation Transcript:
1. Company Profile
The nine jewels “Navratanas” declared by Indian government are NTPC, VSNL, ONGC, IOC, HPCL, SAIL, BHEL, IPCLAND, and BPCL. Therefore, B.H.E.L. is one of the Navratanas .

2. B.H.E.L is ranked among the top 12 companies in the world for manufacturing power generation equipment.

At present B.H.E.L. have 14 manufacturing units. The major units are B.H.E.L. –Bhopal, B.H.E.L. – Hyderabad, B.H.E.L. – Triuchy, and B.H.E.L. – Haridwar. The corporate office is situated in New –Delhi and provides necessary top management leadership.

Communication is a process of transferring information from one entity to another. Communication processes are sign-mediated interactions between at least two agents which share a repertoire of signs and semiotic rules. Communication is commonly defined as "the imparting or interchange of thoughts, opinions, or information by speech, writing, or signs".

 5. Types of Communication Systems
Analog Communication Systems Analog message: “Physical quantity that varies with time” Digital Communication Systems Digital message: “Ordered sequence of symbols selected from a finite set of discrete elements”

6. Telephone Exchange
In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls.

7. Electronic Exchange
Pre-digital automatic exchanges. To overcome demerits of traditional exchanges, electronic exchanges are used. The greatest advantage it provides is that no time is lossed in making a connection and a very high speed of operation is possible.

8. How the telephone call is made…??
Outgoing Calls Generally 48-60V always remains on the telephone line. But as the handset is picked-up the voltage limiter drops this voltage to 9-12V. On hearing the dial tone it is confirmed that the apparatus is ready to work and after dialing the number a ringing pulse is send to the called party. When the calling party picks-up the handset the billing meter of the exchange becomes activated. There is a counter in the exchange, which counts the pulse and converts them into calls.

9. Incoming Calls
Just opposite of outgoing calls. In the incoming calls the telephone detects the ringing signal from the exchange and provides the ring. At the instance of ringing signal, there remains a voltage of 75-110V/20 Hz on the telephone. A high voltage (A.C.) is sent from the ringer section of the exchange to start the ringer circuit of the telephone. The duration of this tone, if unattended, is 1 minute after which an engage tone is heard. After lifting the handset a circuit is established and a call is made.

10. For more please refer our PPT. Thanks.

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