Pylon transformer

Pylon transformer

. Because of weight restrictions transformers for pylon transformers are only built for voltages under 30kV.Pylon transformers are often used for the power supply of facilities outside settlements, such as farmyards or pumping stations at voltages below 30kV. Another application is the power supply of switch heatings from the overhead wire of railways electrified with AC. In this case single phase pylon transformers are used.

In North American utility practice, these devices are called "pole mount" transformers, or nicknamed "pole pigs", and are very commonly used for distribution in areas with overhead primary lines. An alternative to a pole pig is used on underground distribution systems. These transformers are mounted in locked steel cases mounted on a concrete pad on the customer's premises. These are called pad mount transformers. These are used in many urban areas and neighborhoods where the primary lines run underground. Many large buildings have electric service provided at primary voltage. These buildings have customer-owned transformers in the basement for step-down purposes.

Outside a typical house one can see one of these devices mounted on the electricity pole. It's a step-down transformer used to convert the high voltage (7200 or 14400 volts) down to the standard 120/240 volts used in the home. The high voltage distribution lines (7200 or 14400 volts in the US) attach to the two bushings on top. The low voltage wires (two hot wires and one neutral) attach to the three terminals on the side. The secondary winding is center-tapped and grounded, making the two end conductors "hot" with respect to the center tap. These wires run down to the electric meter and breaker panel inside the building. Connecting a load between either hot wire and the neutral gives 120 volts. Connecting between both hot wires gives 240 volts. This is the setup for single-phase electric power in the United States. If the power customer needs three-phase power, three pole pigs of the appropriate KVA rating are wired in either a wye or delta transformer bank.High voltage experimenters often use these transformers in reverse (step-up) by feeding 120 or 240 volts into the secondary and drawing the resulting high voltage off the primary bushings, using it to power devices like Jacob's Ladders and Tesla coils.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Anchor pylon — Anchor pylons or strainer pylons utilize horizontal insulators and occur at the endpoints of conductors. Such endpoints are necessary when interfacing with other modes of power transmission (see image) and, due to the inflexibility of the… …   Wikipedia

  • Huddersfield Narrow Canal Pylon — The Huddersfield Narrow Canal Pylon, (National Grid tower designation 4ZO251B ), is an electricity pylon which stands with its feet over the Huddersfield Narrow Canal near Heyrod, Stalybridge, Greater Manchester at 53°29 37 N, 2°2 25 W. The… …   Wikipedia

  • Electrical substation — An electrical substation is a subsidiary station of an electricity generation, transmission and distribution system where voltage is transformed from high to low or the reverse using transformers. Electric power may flow through several… …   Wikipedia

  • List of electrical engineering topics — This is a listing of electrical engineering and electronic engineering topics and related terms. Contents 1 Electromagnetism 2 Physical laws 3 Control engineering 4 Electronics …   Wikipedia

  • Hydro-Québec's electricity transmission system — is an expansive, international power transmission system located in Quebec, Canada with extensions into the Northeastern United States. Major expansion of the network began with the commissioning of the alternating current 735,000 volt (735 kV)… …   Wikipedia

  • Facility 0704 — is a 110kV three phase AC powerline built in 1952 with 2 electric circuits south of Gomaringen, Germany. BackgroundFacility 0704 begins at a branch pylon near the loop mill ( Schleifmühle ) at Gomaringen and runs across a distance of… …   Wikipedia

  • GKK Etzenricht — thumb|Switchyard of former GKK Etzenricht. On the right the pylon by which thepowerline to Czech runs, left from this the valve hall, on the left the only remaining AC filterGKK Etzenricht, abbreviation for Gleichstromkurzkupplung) Etzenricht,… …   Wikipedia

  • Insulator (electrical) — Ceramic insulator at railways Conducting copper wire insulate …   Wikipedia

  • Electric power transmission — Electric transmission redirects here. For vehicle transmissions, see diesel electric transmission. 400 kV high tension transmission lines near Madrid Electric power transmission or high voltage electric transmission is the bulk transfer of… …   Wikipedia

  • Electricity meter — Typical North American domestic analog electricity meter …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”