DE102010035269A1 - Energy system for use in transformer station, has draining channels, cooling elements and blowing lattices arranged in receiving elements and/or supporting elements of active portion of medium-voltage switchgear - Google Patents

Abstract

The system has a medium-voltage switchgear (7) with an active portion (8) arranged in a gas chamber (17) of a gas-insulated transformer (5) or a supplementary gas chamber (9) attached to the switchgear. A medium voltage terminal (10) of the switchgear is connected to a gas-insulated active component (2) of the transformer. The switchgear, low-voltage distribution board, lifting device, housing portions, draining channels (13), cooling elements (14) and blowing lattices (15) of gases of interfering light arc are arranged in receiving elements and/or supporting elements of the active portion.

Description

The invention relates to a housing for energy systems, in particular for transformer stations. A transformer station is an electrical equipment and connected in function, at least one transformer, a medium-voltage switchgear, possibly transducers, counters and low-voltage distribution. They are delivered as fully factory-ready tested units and commissioned on site after connecting the supply cables.

The foundation trough of the transformer stations contains an oil pan as the most commonly used transformers have insulating oil as a cooling medium. In practice, there are the housings for energy systems in both concrete, plastic, aluminum sheet and steel sheet.

The concrete casings have the foundation trough and the housing predominantly in one piece. They are therefore difficult and limited in equipment design options.

The sheet steel housings have the advantage of fire resistance compared to plastic or aluminum housing. They are very resistant to corrosion due to today's production possibilities and the use of galvanized sheet steel with powder coating. The practice here shows a life expectancy of over 30 years.

The enclosures for power engineering plants, in particular for transformer stations in sheet steel, predominantly have a foundation sump made of 4 mm steel sheet, oil-tight welded with a fixed mechanical structure, which is able to accommodate the power engineering components such as transformer, medium-voltage switchgear, transducers, meters and low-voltage distribution. Since the steel tub is 80% in the ground, it will be galvanized by immersion. It then has an outer and inner zinc layer of> 70 microns. Subsequently, the tub gets a powder layer or bituminous layer of at least 140 microns. A solution that has proven itself in practice for decades. However, this necessary oil-tight tub construction is very expensive. Another aspect of this arrangement is the oil-insulated transformer. It embodies a high fire load and today has mostly a hermetically sealed boiler. This kettle is like out 1 obviously traditionally executed as a corrugated iron boiler. Shown is a half boiler with associated active part ( 2 ). The insulating part of the active part is directly above the corrugated metal ( 1 ) thermally connected to the cooling environment. The corrugated metal wall thickness is however predominantly only 1.2 mm. An isolation-technically complex active part ( 2 ), which today is a power energy collector with its medium-voltage winding and low-voltage winding, because not only from the medium-voltage side is fed but also by the decentralized energy supply from the low-voltage side, energy is introduced.

It happens that a fire in the low-voltage system leads to the combustion of the cable insulation of the connecting lines to the transformer whose still live conductor receives an arc connection to the boiler or corrugated iron and burns holes here, then lead to leakage of the oil and the existing fire additional food give. This results in very high temperatures and extreme fire consequences.

Since these electrotechnical systems in compact design are everywhere in the public area, accessible to everyone, and you know that a transformer 630 kVA contains about 300 liters of insulating oil, you realize how close the potential danger.

From patent no .: 10 2007 003 941 a power transformer with pressure-resistant boiler and vessel-integrated cooling is known. This design is in 2 shown. Shown is a half boiler ( 3 ) with associated active part ( 2 ), waves (in the middle of the shaft arrangement) 1 ) are omitted around the cutouts ( 4 ) above and below in the boiler part ( 3 ) in the presentation. Here is the boiler part ( 3 ) from a continuously folded multi-plate thick sheet metal. In the longitudinal wall are above and below cutouts ( 4 ). Corrugated sheets ( 1 ) are welded on the inside (to the active part) and outside (to the environment) to this wall oil-tight. The corrugated sheet assembly is filled with a cooling liquid which is independent of the insulating medium to active part ( 2 ). The depth of the waves (inside, outside) can be adjusted depending on the thermal transfer capability of the insulating - or donating media. This results in a boiler which is pressure-resistant and is capable of the thermal losses of the active part ( 2 ) depending on the depth of the corrugated sheets ( 1 ) for both liquid and gaseous insulating dissipate.

This boiler version 2 stands out from the traditional design and paves the way for a new technical construction of housing for energy systems that uses only gaseous insulating media as a coolant for the active part.

• – Ausgesprochen Brandlastarm. Das Aktivteil kann abhängig von dem gasförmigen Isoliermedium sehr brandarm ausgeführt werden.
• – Keine Ölauffangwanne
• – Durch Verwendung von dem gleichem Gasisolierendem Medium in der Mittelspannungsschaltanlage und um dem Aktivteil des Transformators können beide Elementen zu einem gleichen Gasraum verschmelzen

The advantages are:

• - Pronounced fire load arm. The active part can be carried out very low fire depending on the gaseous insulating medium.
• - No oil sump
• - By using the same gas-insulating medium in the medium-voltage switchgear and the active part of the transformer both elements can merge into a same gas space

This new technical solution of electrical equipment, especially stations is in 3 shown.

The new system consists of at least one gas-insulated transformer ( 5 ) and a medium-voltage switchgear ( 7 ). The gas-insulated active part ( 2 ) of the transformer has a complete metallic encapsulation whose walls are one-, two- or three-sided with a vessel-integrated cooling ( 6 ), a leftover page ( 16 ) is used as a partition ( 16 ) to the MS switchgear ( 7 ) or as a housing part ( 16 ) the metal-enclosed MS switchgear ( 7 ), whereby the active parts of the medium voltage switchgear ( 8th ) either in the gas space ( 17 ) of the transformer or in an additional one of the MS switchgear ( 7 ) associated gas space ( 9 ) are housed. The medium voltage connection ( 10 ) of the MS switchgear ( 7 ) to the active part ( 2 ) of the transformer ( 5 ) can go directly to the active part ( 2 ) or by the encapsulation ( 16 ) respectively. The pressure relief ( 11 ) in the event of an arc in the transformer ( 5 ) or in the MS switchgear ( 7 ) takes place in a floor frame ( 12 ), which in function the receiving elements or support elements for the active part ( 2 ), the MS switchgear ( 7 ), the low-voltage distribution, the lifting device and other housing parts may contain, but also drainage channels ( 13 ), Cooling elements ( 14 ) and exhaust grille ( 15 ) for the internal arc gases.

The possible integration of the active parts of the MS switchgear ( 8th ) in the gas space of the transformer ( 5 ) leads to very small construction methods.

This arrangement leads with anodized roof and possibly protective walls to an electrical system that can be set up with little effort. The system has a gas-insulated MV switchgear, a corresponding active part and low-voltage distribution a very low fire load. Arc faults within the MV switchgear or transformer remain safely enclosed in the system.

The system is thus very safe even in extreme internal fault situations or outside influences, such as mechanical damage caused by traffic accidents in public spaces.

Brief description of the drawings:

1 View of a half boiler part with active part of a transformer in conventional design.

2 View of a half boiler part with active part of a transformer in the version according to patent no .: 10 2007 003 941.

3 View of the new power plant

LIST OF REFERENCE NUMBERS

1

corrugated iron 1 . 2 and 3

2

Active part of the transformer 1 . 2 and 3

3

Boiler part of 2

4

Cutout in boiler part 3 from 2

5

transformer 3

6

Vessel-integrated cooling 3

7

MV switchgear 3

8th

Active parts of the MS switchgear 3

9

Gas chamber of the MS switchgear 3

10

Medium voltage connection from MV switchgear to transformer 3

11

Pressure relief path of the arc flash gases 3

12

bottom frame 3

13

Pressure relief channel for the internal arc gases 3

14

Cooling arrangement for the arc fault gases 3

15

Outlet grille for the internal arc gases 3

16

Partition wall or housing part of the MS switchgear 3

17

Gas space of the transformer 3

Claims (1)

Energy-technical plant, in particular for transformer stations, consisting of at least one gas-insulated transformer ( 5 ) and a medium-voltage switchgear ( 7 ), characterized in that the gas-insulated active part ( 2 ) of the transformer has a complete metallic encapsulation whose walls have one, two or three sides with a vessel-integrated cooling ( 6 ), a leftover page ( 16 ) in the function as a partition ( 16 ) to the metal-enclosed MS switchgear ( 7 ) or as a housing part ( 16 ) the metal-enclosed MS switchgear ( 7 ), the active parts ( 8th ) of the medium voltage switchgear ( 7 ) either in the gas space ( 17 ) of the transformer or in an additional one of the MS switchgear ( 7 ) associated gas space ( 9 ), the medium-voltage connection ( 10 ) of the MS switchgear ( 7 ) to the transformer ( 5 ) directly to the active part ( 2 ) of Transformers ( 5 ) or by the encapsulation ( 16 ) to the active part ( 2 ) of the transformer ( 5 ) and the pressure relief ( 11 ) in the event of an electric arc fault, in the transformer ( 5 ) or in the MS switchgear ( 7 ), in a floor frame ( 12 ) is introduced, the function of the receiving elements or support elements for the active part ( 2 ), the MS switchgear ( 7 ), the low-voltage distribution, the lifting device and other housing parts may contain, but also drainage channels ( 13 ), Cooling elements ( 14 ) and exhaust grille ( 15 ) for the internal arc gases.

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