Compact Secondary Substations (CSS) For secure, reliable power distribution and space saving solutions

Transcription

1 Compact Secondary Substations (CSS) For secure, reliable power distribution and space saving solutions

2 ABB a global leader ABB is a global leader in Power and Automation technologies that enable utility and industry customers to improve performance while lowering environmental impact. The ABB Group of companies operates in around 100 countries. In India, ABB serves customers with the complete range of power and automation technologies. The company has a vast installed base, extensive manufacturing and a countrywide marketing and service presence. The Power Technologies division offers electric, gas and water utilities as well as industrial and commercial customers a wide range of products, systems and services for power generation, transmission and distribution. ABB s turnkey solution capabilities in the sector range from bulk power transmission, substations and complete electrification to utility automation and distribution systems. The product offering covers a wide spectrum of technologies across the entire voltage range including indoor and outdoor circuit breakers, air and gas insulated switchgear, disconnectors, capacitor banks, reactive power compensators, power distribution and instrument transformers and a range of power distribution products like Compact Substations (CSS), Ring Main Units (RMU). Advantage ABB 120 years of technology and innovation Unparalleled domain competence Vast global experience Total solution provider Large installed base Environment-friendly technologies 2 ABB

3 Compact Secondary Substations (CSS) Designed in accordance with IEC standards, the CSS is a prefabricated secondary substation with type-tested equipment and includes a distribution transformer, medium voltage switchgear, low-voltage switchboard, connections and associated equipment in a compact unit. The CSS is designed keeping in mind high levels of personal safety and aesthetics as they are often located in high density, urban centres. All components are housed in an enclosure, which protects the equipment against environmental hazards and unauthorised access. The enclosure is typically divided into three sections or compartments medium voltage switchgear, low voltage switchboard and distribution transformer. The substation can be operated from the inside (Walk-in type) or from the outside (Non Walk-in type). The electrical equipment is cooled by natural ventilation through openings in the substation. The standard degree of protection for CSS is IP23D in accordance with IEC standards. If required, CSS can be supplied with doors that comply with IP54 standards, by including gaskets and excluding the door ventilation openings. Key features Wide modular product range Enhanced safety Several options and extensive flexibility Appealing aesthetics Reduced overall plant and operating costs Applications Secondary Substation Distribution Operation Supply Feeding Satellite Pylon feeder station Application Public distribution At medium-voltage level To satellite stations and major electricity customers Connection of decentralised power plant to the public network Substations for the end of radial connections Smaller stations connected to overhead lines Type designations (example) Product type CSS = Compact Secondary Substation Materials S = Steel C = Concrete Layout W = Walk-in N = Non Walk-in C = Compact Width Number of modules wide Length Number of modules long CSS-S C - X - Y Quality The entire CSS range is manufactured in accordance with ABB s stringent quality and environmental (ISO 9001 and ISO 14001) standards. Personal safety All live parts in the CSS range are protected against unintentional contact by means of lockable doors. Cable connections and fuses in the medium voltage room are also protected against unintentional contact. Anti-contact protection is tested in accordance with IEC Clinched or screwed connections form electrical connections with all of the station s metal parts. The galvanised steel foundation is bolted to the structure. The result is a fully earthed enclosure, providing a high level of personal safety. Protection The substation is subjected to moisture, condensation and dirt. In coastal locations sea salt on the surface of open, insulated surfaces can cause leaking current, which can result in a flashover. Accordingly, the CSS is designed and fabricated using material and equipment capable of withstanding harsh climatic and operational conditions. ABB 3

4 Product overview The CSS consists of modular components which makes it possible to custom design the equipment based on customers requirements. The solutions shown below are a few examples of the many options. Model CSS-SW Walk-in station. Surface mounted and operated from the inside. Model CSS-SN Non-walk-in station. Surface mounted and operated from the outside. Model CSS-SC Compact station. Installed partially below the ground and operated from the outside. Legend Low voltage switchboards Medium voltage switchgear Distribution transformer 4 ABB

5 Design Modular structure The enclosures of CSS consist of 300mm wide modules (M) and plus corner sections measuring 115x115 mm. The walls are supplied in four different heights and the roofs with two angles of pitch, 6 o and 18 o. The doors are 2, 3 or 4 m wide and can be fitted as either single or double doors. The ventilation doors are 2 or 3 m wide. Standard building sizes Clinching technology for maximum strength is used to assemble the walls and the roof. Lifting fittings, corner sections, bearing sections, base plates and cable covers are assembled using bolts. The low voltage switchboard and the medium voltage switchgear are bolted to the structure. The roof, the walls and doors are constructed from 1.5 mm galvanised sheet steel and the CSS is painted with two coats of polyurethane paint. Foundation or base frame W = Width 4 M 5 M 6 M 7 M External width, steel (mm) L = Length 5 M 6 M 7 M 8 M External length, steel (mm) L = Length 9 M 10 M 11 M 12 M External length, steel (mm) H = Wall height (mm) R = Roof height (mm) Width of building 4 M 5 M 6 M 7 M 6 roof pitch roof pitch The CSS models designed for installation at ground level have a 130mm high base frame. The models for installation partially below ground level are supplied with foundations at three different heights: 528mm, 778mm or 978mm, depending on the size of the transformer. The foundation and base frame are produced using 2mm G.I. Sheet. The CSS comes in standard sizes and other customised sizes can be supplied on request. The Enclosure The enclosure is typically divided into three compartments for the medium voltage switchgear, low voltage switchboard and distribution transformer. All standard modules of walls, doors and ceilings are produced using roller formed sections. The detachable roof with ventilation openings is supported by a beam and secured to the corner sections with bolts. Standard doors are fitted with handles and bolts for padlocks. The doors are closed by means of a twopoint device, which secures the door to the top frame and the base frame. The doors are fitted with stainless steel hinges and with door stoppers. The wall and roof modules are assembled by means of a self-locking mechanism. ABB 5

6 Oil collection pit When the CSS is installed partly below the ground, an integrated oil collection pit made from 1.5 mm galvanised steel is a standard feature. A separate oil collection pit for stations installed at ground level can be supplied. The distribution transformer is fitted in the oil collection pit, which has a volume of at least 20% of the transformer s oil volume. The oil collection pit provides protection against oil pollution in case of a leak in the transformer. The oil pit is normally supplied as per IE regulations where the transformer oil capacity is >2000 litres. Ventilation Ventilation is achieved by means of natural air circulation of air from the top of the roof to the lower part of the doors that contain ventilation openings. Sufficient cooling of the distribution transformers is achieved by means of ventilation openings in the transformer room that are designed considering transformer rating, losses and climatic conditions. A standard CSS is classified and type tested in accordance with temperature class K20. Temperature class K10 can be achieved for all ground level substations by means of additional ventilation that can be achieved by increasing the ventilation area of the transformer room. The oil collection pit Partitioned roof The standard roof of up to 3.8 m in length can be detached in one piece. A partitioned roof can be supplied for stations over 3 m. Doors Standard doors are designed for padlocks and can also be fitted with a cylinder lock. Protection To provide protection against dust in the mediumvoltage and low-voltage compartments, the doors can be fitted with gaskets that increase the degree of protection to IP54. Ventilation openings in the doors Other options available Functionality CSS CSS CSS SW SN SC Concrete slab as base Doors with IP54 protection Temperature class K10 Earthing system up to 20 ka Partitioned roof (longer than 3 m) Cylinder lock in doors Aluminium foundation plates Snow panel below doors 6 ABB

7 Electrical equipment in the CSS Medium voltage switchgear The CSS range has been designed and type tested with ABB s medium voltage switchgear and can house the following: Ring Main Unit SafeRing 12-24kV Fuse-switch disconnectors The range of medium voltage switchgear includes both pre-configured and fully configurable gasinsulated solutions. A high level of personal safety is ensured using type tested equipment. Low-voltage switchboard CSS is designed to house various low voltage solutions in accordance with standard norms and regulations, as well as individual requirements. The product range includes various types of fuse-switch disconnectors, including DIN solutions and moulded case circuit breakers. Other equipment can be supplied as per customer specifications. Distribution transformer CSS stations are designed to house distribution transformers up to 1250 kva / 24 kv: Oil-insulated model, hermetically sealed Oil-insulated with oil conservator The CSS can be supplied with a pre-installed distribution transformer. The possibility of lifting the substation with the transformer depends on the type of station, the relevant solution and the transformer size. Cables and cable accessories CSS is supplied with internal cables / terminations: Medium-voltage cables from medium-voltage switchgear to the distribution transformer Low-voltage cables / busbars from low-voltage switchboards to the distribution transformer SF 6 gas-insulated medium-voltage switchgear is connected using elbow connections. The cable termination to the transformer is through regular cable adapters or, if required, elbow connections. The lowvoltage cable / busbars between the distribution transformer and the lowvoltage switchboard are fitted with the necessary terminations. Type test The CSS range is designed and type tested in accordance with IEC 61330, which covers the following test programmes: Control of insulation level Control of temperature rise in the main components in the substation Control of earthing system Control of internal protection class Control the building resistance to mechanical effects Function tests on mechanical parts Additional type tests in accordance with IEC 61330: Rated short-time current test Noise test EMC test The main components are type tested in accordance with their individual standards: Medium-voltage switchgear IEC 60265: High-voltage switches IEC 60298: Metal-enclosed high-voltage switchgear IEC 60694: High-voltage switchgear Low-voltage switchboard IEC 60439: Low-voltage switchgear and control gear Distribution transformer IEC 60076: Power transformers ABB 7

8 ABB Limited Medium Voltage Power Technologies Plot No. 79, Street No. 17 MIDC Area, Satpur Nashik , India Tel: , Fax: Regional Marketing Offices: North NBCC Tower 4th Floor No. 15, Bhikaji Cama Place New Delhi Tel: Fax: /84035 West ABB House Dr. S B Path Ballard Estate Mumbai Tel: Fax: /77 South Embassy Star, 1st Floor No. 8, Palace Road Vasanth Nagar Bangalore Tel: Fax: East 4th Floor No. 9 Elgin Road Kolkata Tel: /8 Fax: Central Vandana House 1st Floor G E Road, Ramkund Raipur Tel: Fax: Century Plaza No. 3C, 3D & 3F, 3rd Floor 561 / 562, Anna Salai Teynampet (Mount Road) Chennai Tel: Fax: