ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

HVAC Transmission System (Electric Power Transmission Lines)

Updated on May 4, 2013

Introduction to HVAC Transmission System

The increased demand of electricity needs more generation of electrical power. As the generation takes place at remote places, an efficient distribution system is necessary. The problems of AC transmission particularly in long distance transmission has led to the development of DC transmission.

HVAC Transmission system can be divided into two parts:

(a) Transmission System

(b) Distribution Sysyem

Each part is again subdivided into two parts:

1. Primary Transmission

2. Secondary Transmission

Generation and transmission now a days is almost exclusively three phase. The secondary transmission is also three phase whereas the distribution to the customer may be three phase or single depending on the requirement of the consumer.

HVAC Transmission System

HVAC Transmission System
HVAC Transmission System | Source

Primary Transmission

in fig the central station CS generates power using three phase alternators at 6.6 or 11 or 13.2 or 32 kV. The voltage is then stepped up by suitable three phase transformers, to 132 kV as shown.

Such a high voltage of transmission requires conductors of smaller cross section which results reduction in the cost of copper or aluminium.

However the cost of insulation increases. The transmission voltage is therefore determined by economic considerations. Higher transmission voltage also reduces the line losses and improves the efficiency.

The three phase three wire overhead high voltage transmission line gets terminated in the step down transformers in a sub station known as Receiving Station (RS).

Receiving station is usually situated outside the city to ensure safety. Here the voltage is stepped down to 33 kV from 132 kV.


Secondary Transmission

From The receiving station, power is then transmitted at 33kv by underground cables located at various points in the city. This is known as secondary or low voltage transmission. At substation this is further reduced from 3kV to 3.3 kV, using step down transformers.

Primary Distribution

The output of substation at 3.3 kV can be directly given to a customer whose demand exceeds 50kVA using special feeders. This is primary distribution.

Secondary Distribution

The secondary distribution is done at 440 or 230 V. The reduction in voltage level from 3.3 kV to 440/230 V is done by the step down transformers at the distribution substations.

The most common system for secondary distribution is 440/230 V, three phase, four wire system. The single phase residential load is connected between any one line and the neutral where as three phase 440 V , motor load is connected across thee phase lines directly. The standard frequency for a.c. working is 50 Hz in India and 60 Hz for U.S.A. For single phase traction applications, frequencies as low as 25 or 16.67 Hz are also used.

Comments

    0 of 8192 characters used
    Post Comment

    • profile image

      suraj onkar ingole 

      3 years ago

      created an energy magnetic or solar reduce the cost.....

    • profile image

      prakash 

      4 years ago

      very helpful .....

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)