Air Insulated Switch-gear VS Gas Insulated Switch-gear

Air Insulated Switch-gear VS Gas Insulated Switch-gear

Gas Insulated Switch-Gear
Air Insulated Switch-Gear

Limitations of Air Insulated Switchgears (AISs)

  • Large dimensions due to statutory clearances & poor dielectric strength of air
  • Insulation deterioration with ambient conditions and susceptibility to pollutants
  • Wastage of space above
  • Life of steel structures
  • Seismic instability
  • Large planning and execution time
  • Grounding-mat is essential for containing touch and step potentials
  • Hot line washing and regular maintenance of the substation is essential, requires more spares inventory and man-power

Advantages of GISs over AISs

  • Compact space-saving design
  • Minimal operating cost
  • Minimal weight by lightweight construction
  • Safe encapsulation
  • Environmental compatibility
  • Economical transport
  • Reliability
  • Smooth and efficient installation and commissioning








Every Challenge Is An Opportunity


Edison, one of Europe’s oldest power companies, which was founded in 1884 in Milano, owns the Fontanamora hydroelectric plant that generates three megawatts (MW) of renewable power from turbines and auxiliary machinery. The plant is situated at Lombardy by a fast-flowing river at the bottom of a steep gorge. Lombardy lies in the north of the country, sharing a border with Switzerland.
As the second energy company in Italy, and a European leading operator with operations in the supply, production and sales of electric power and hydrocarbons (natural gas and crude oil), Edison has a strong focus on renewable generation. It has 7.7 giga watts (GW) of installed renewable capacity, comprising hydroelectric, wind, solar, thermometric plants and a biomass system.

The challenge


At the beginning of 2013, Edison decided to undertake a complete revamp of the plant, with the project including also the step-up of the voltage level of connection to the electricity grid, from medium to high voltage. The customer decided to replace the previously installed switch gear with a new product featuring the latest in switching technology: ABB's PASS hybrid switch gear module, rated at 72.5 kilo volts (kV).

The project was challenging both technically and from an installation perspective, as access to the powerhouse is only possible by way of a steep, narrow stairway down the side of the gorge. Entrance to the powerhouse is small, and the room available for installing switch gear is only three square meters wide.

Solution with innovative design

To cope with these difficult space challenges, ABB leveraged its expertise in switch gear design to supply a hybrid module that integrates a circuit breaker and two dis-connectors, plus current and voltage transformers – and the control and protection relay in a single unit. 
Plug-in cable terminals instead of traditional air-insulated bushings were deployed to further reduce the module's size, enabling it to fit it in the reduced space of the Fontanamora powerhouse.

Innovative logistics

To overcome the narrow stairway and minimise transport risks, the installation team secured the PASS hybrid module with special harness straps – and lowered it down into the gorge with a crane. The preassembled unit arrived on site pretested for high-voltage and ready for installation, which took four days. There was no need for the additional equipment typically needed to perform on-site high-voltage tests, so the ABB PASS hybrid module could be put into service without delay, saving time and costs.








RENEWABLE ENERGY DEMAND IN EUROPE REACHES RECORD LEVELS

RENEWABLE ENERGY DEMAND IN EUROPE REACHES RECORD LEVELS


The demand for renewable electricity in Europe, documented with Guarantees of Origin (GO), continued to grow in 2015. The growth is up more than 8% from 2014 and surpassed 340 TWh. Behind this growth are thousands of businesses and millions of households in numerous European countries – voluntarily purchasing renewable electricity documented with Guarantees of Origin.
The market has seen a steady increase in national participants but is still dominated by a select number of countries. The five countries that consume the most renewable energy are Germany, Sweden, Switzerland, the Netherlands and Italy. Together they demand ¾ of the renewable energy used in Europe. The Netherlands is the fastest growing market. From 2014 to 2015 it has grown by a brisk 12%, and consumed more than 42.5 TWh in 2015. Germany is still the largest market with a total volume of 87 TWh in 2015.

The marketplace for Guarantees of Origin is steadily growing in terms of countries, with more than 20 countries actively working with AIB (Association of Issuing Bodies) and fully using EECS, the common European market standard.
Norway, Austria, Finland, Denmark, France and Belgium today make up the next group of countries – each with a steady market demand between 10 and 35 TWh annually. The rest of the national markets are still fairly immature, and together represent only a smaller share of the total market demand.
The AIB statistics include only GOs based on the EECS standard. There are still countries with national certificate markets that have yet to adopt the EECS standard. These markets total more than 100 TWh of additional market demand. This pushes the actual market volume beyond 440 TWh.
United Kingdom and Spain – will they join the European market in 2016?
The development in 2015 follows a record-breaking 2014, during which the market experienced a 27.6 % growth and an all-time high, 314 TWh demand for renewable electricity. Moreover, for the first time since 2011, there was a real balance between supply and demand.
With the UK, Spain and a few smaller countries considering joining AIB, and adopting the EECS standard, there is much discussion and uncertainty concerning how this will affect the market. Both the UK and Spain are countries with a sizable renewable energy generation, as well as a corporate sector that can have strong demand for renewable energy. Wholesale prices have risen significantly the last part of 2015. The question market-players and consumers are voicing is “Will the inclusion of new markets give additional push to the upward price development?”
The European demand for renewable electricity documented by Guarantees of Origin now constitutes more than 13% of all electricity consumption in Europe (ca. 3,200 TWh) and approximately 40% of all electricity generated from renewable sources in Europe (ca. 1,100 TWh).
The above is a commentary based on figures published by AIB (Association of Issuing Bodies).
ECOHZ offers renewable energy solutions to electricity providers, businesses and organizations across Europe, North America and Asia – providing renewable electricity, from a wide range of sources, regions and qualities. Renewable electricity is documented by Guarantees of Origin in Europe, RECs and Green-e in the US, and International RECs (I-REC) in selected Asian markets. ECOHZ also provides a new and innovative solution – GO² – combining renewable energy purchases with the financing and building of new renewable power generation. Companies choosing documented renewable energy can reduce their carbon footprint and improve their sustainability ratings. ECOHZ is among the leading independent suppliers in Europe, and is located in Norway and Switzerland. ECOHZ endeavors to play an active role in the current energy transition through its vision of “changing energy behavior”.
For more information see: http://www.ecohz.com







Why Transformer Rating In kVA, Not in KW?

Why Transformer Rating In kVA, Not in KW?

In Simple words, 
There are two type of losses in a transformer:
1. Copper Losses
2. Iron Losses or Core Losses or  Insulation Losses
Copper losses ( I²R)depends on Current which passing through transformer winding while Iron Losses or Core Losses or  Insulation Losses depends on Voltage.
That’s why the Transformer Rating may be expressed in kVA,Not in kW.







Different types of transformer

Different types of transformer

Types of Transformers:

There are two basic Types of Transformers
  1. Single Phase Transformer
  2. Three Phase Transformer
Below are the more types of transformer derived via different functions and operation etc.

Types of Transformers w.r.t Cores:

  • Core Type Transformer
  • Shell Type Transformer
  • Berry Type Transformer

Types of Transformer w.r.t uses:

  • Large Power Transformer
  • Distribution Transformer
  • Small Power Transformer
  • Sign Lighting Transformer
  • Control & Signalling Transformer
  • Gaseous Discharge Lamp Transformer
  • Bell Ringing Transformer
  • Instrument Transformer
  • Constant Current Transformer
  • Series Transformer for Street Lighting

Types of Transformer w.r.t Cooling:

  • Self Air Cooled or Dry Type Transformer
  • Air Blast-Cooled Dry Type
  • Oil Immersed, Self Cooled (OISC) or ONAN (Oil natural, Air natural)
  • Oil Immersed, Combination of Self Cooled and Air blast (ONAN)
  • Oil Immersed, Water Cooled (OW)
  • Oil Immersed, Forced Oil Cooled
  • Oil Immersed, Combination of Self Cooled and Water Cooled (ONAN+OW)
  • Oil Forced, Air forced Cooled (OFAC)
  • Forced Oil, Water Cooled (FOWC)
  • Forced Oil, Self Cooled (OFAN)

Types of  Instrument Transformer:

  • Current Transformer
  • Potential Transformer
  • Constant Current Transformer
  • Rotating Core Transformer or Induction regulator
  • Auto Transformer








Different Parts of Transformer

Different Parts of Transformer

1.
Oil filter valve
17.
Oil drain valve
2.
Conservator
18.
Jacking boss
3.
Buchholz relay
19.
Stopper
4.
Oil filter valve
20.
Foundation bolt
5.
Pressure-relief vent
21.
Grounding terminal
6.
High-voltage bushing
22.
Skid base
7.
Low-voltage bushing
23.
Coil
8.
Suspension lug
24.
Coil pressure plate
9.
B C T Terminal
25.
Core
10.
Tank
26.
Terminal box for protective devices
11.
De-energized tap changer
27.
Rating plate
12.
Tap changer handle
28.
Dial thermometer
13.
Fastener for core and coil
29.
Radiator
14.
Lifting hook for core and coil
30.
Manhole
15.
End frame
31.
Lifting hook
16.
Coil pressure bolt
32.
Dial type oil level gauge.

Introduction to Electrical Transformer

Introduction to Electrical Transformer

What is a Transformer?

In Very Simple words.
Transformer is a device which:
  1. Transfer Electrical power from one electrical circuit to another Electrical circuit.
  2. It’s working without changing the frequency.
  3. Work through on electric induction.
  4. When, both circuits take effect of mutual induction.
  5. Can’t step up or step down the level of DC voltage or DC Current.
  6. Can step up or step down the level of AC voltage or AC Current.

  • Without transformers the electrical energy generated at generating stations won’t probably be sufficient enough to power up a city. Just imagine that there are no transformers.How many power plants do you think have to be set up in order to power up a city? It’s not easy to set up a power plant. It is expensive.
  • Numerous power plant have to be set up in order to have sufficient power. Transformers help by amplifying the Transformer output (stepping up or down the level of voltage or current).
  • When the number of turns of the secondary coil is greater than that of primary coil, such a transformer is known as step up transformer.
  • Likewise when the number of turns of coil of primary coil is greater than that of secondary transformer, such a transformer is known as step down transformer.


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