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KSZ, KSW, KSWz Container transformer stations

Application

MV container transformer stations and cable boxes in enclosures for external maintenance (KSZ) and internal maintenance (KSW) and ZKSN cable boxes in enclosures are intended to provide power supply for city, construction site, and industry recipients from medium voltage cable and overhead or cable networks.

If other configurations are necessary, we offer professional technical counselling. The company shall draft up the design adaptation for the construction and electric parts in agreed designs.

Equipment

Innovative technology of production

The characteristic feature of the enclosure systems produced by Strunobet-Migacz Sp. z o.o. is the technology of manufacturing elements that constitute monolithic components. The structure consists of independent parts that make up the cable basement, the main part and the roof. Depending on the selected devices and intended use, the enclosures may be executed in compact (with external maintenance) and container (external maintenance) versions.

Main part

The main part of the enclosure of the transformer station is the system of four walls monolithically integrated with the floor. The floor is a separation of the transformer room and the switchgears from the internal space of the cable basement.

The separation of the transformer room from the switchgear room is done with the barrier made of perforated or solid sheet in a frame of an angle, or alternatively a reinforced concrete slab fixed to the external walls and the floor.

The enclosure is made of self-curing concrete SCC class C 30/37. Concreting of the enclosure is done upside down, with simultaneous concreting of the walls with the floor to achieve a leak tight monolith. Openings are provided in the walls for the door and grates and in the floor for running the cables.

The internal surface of the walls is covered with acrylic decorative plaster (white or any other light colour). The external surface of the walls is also covered with acrylic façade plaster. The colour scheme and façade type are offered in the standard version. The colour scheme and the type of the façade of the enclosure may be selected in accordance with the individual requirements of the client. The protection degree is increased to REI 120 with PROMATEC panels fixed on the internal surface of the walls.

Cable basement

The cable basement is executed in the form of a single-piece prefabricated element with the size matching the freezing zone of the ground, which at the same time performs the role of the foundation of the station. The cable basement is made of self-curing concrete SCC class C C30/37.

The cable basement has a 300 mm high barrier provided to separate a part of the basement as the “bathtub” for the whole oil from the transformer (plus some reserve). On request of the Employer, the barrier may be executed at the full height of the basement, in the numbers stated by the Employer. The area of the oil bowl is covered with two coats of oil-resistant paint. Sleeves (e.g. made of plastic) are permanently concreted in the walls for cable and earthing passages. The external surfaces of the cable basement are covered with the proper agents that ensure its total water- and leak-tightness execution in both directions.

Roof

The roof of the enclosure is executed in the form of the rectangular reinforced concrete slab with variable thickness in order to achieve 2.2% gradient towards the larger dimension. The minimum thickness of the roof slab at its edge is 90 mm, with the maximum thickness of 130 mm in the centre of the span. The roof slab is made of self-curing concrete SCC class C 30/37. Complex elements, such as the edge or the eaves, are additionally reinforced. The roof is set directly on the walls. The elastomer primer creates the gap between the walls of the station and the roof, which is used for natural ventilation of the station room. The roof is placed without fixing to enable its upward movement in case of arc shorting in order to provide escape path for gases and half-particles, and then fall back on its place. The external surface of the roof is painted with paint resistant to solar radiation and rainwater, and it may be additionally covered with a layer of roofing paper. To adjust the shape of the roof to the architectural requirements, it is possible to provide add-ons in the form of gable or envelop canopies covered with metal or ceramic roofing tiles.

Types of enclosures

External maintenance

ZKSN 130/210 enclosure

A compact enclosure with external maintenance is mostly used for MV cable boxes with the integrated distribution board in SF6 or vacuum insulation. The enclosure consists of two elements (the main part and the roof). The new solution offers the possibility of execution of the cable box with a MV switchgear in RSS air insulation.

  • External width1,3 m
  • External length2,1 m
  • Total height2,5 m
  • Height after setting (from the ground level)1,65 m
  • Development area2,73 m²
  • Usable area2,09 m²
  • Mass of the main part4,12 t
  • Mass of the roof0,88 t
  • Total mass5 t

ZKSN 130/290 enclosure

A compact enclosure with external maintenance is mostly used for MV cable boxes with the integrated distribution board in SF6 or vacuum insulation. The new solution offers the possibility of execution of the cable box with a MV switchgear in RSS air insulation.

  • External width1,6 m
  • External length2,9 m
  • Total height2,5 m
  • Height after setting (from the ground level)1,65 m
  • Development area4,64 m²
  • Usable area3,63 m²
  • Mass of the main part5,74 t
  • Mass of the roof1,56 t
  • Total mass7,3 t

KSZ 210/290 enclosure

A compact enclosure with external maintenance is mostly used for compact transformer stations with the transformer power up to 630 kVA, with the integrated distribution board in SF6 or vacuum insulation. The enclosure consists of two elements (the main part and the roof). Depending on the used devices and the required maintenance type, the enclosure may be provided in four variants (A, B, C and 3P).

Custom solutions including the possibility of execution of additional access doors in the walls.

Variant A

  • External width2,1 m
  • External length2,9 m
  • Total height2,5 m
  • Height after setting (from the ground level)1,65 m
  • Development area6,09 m²
  • Usable area5,13 m²
  • Mass of the main part6,04 t
  • Mass of the roof1,95 t
  • Total mass7,99 t

Variant B

  • External width2,1 m
  • External length2,9 m
  • Total height2,5 m
  • Height after setting (from the ground level)1,65 m
  • Development area6,09 m²
  • Usable area5,13 m²
  • Mass of the main part6,5 t
  • Mass of the roof1,95 t
  • Total mass8,45 t

Variant C

  • External width2,1 m
  • External length2,9 m
  • Total height2,5 m
  • Height after setting (from the ground level)1,65 m
  • Development area6,09 m²
  • Usable area5,13 m²
  • Mass of the main part6,25 t
  • Mass of the roof1,95 t
  • Total mass8,2 t

Variant 3P

  • External width2,1 m
  • External length2,9 m
  • Total height2,5 m
  • Height after setting (from the ground level)1,65 m
  • Development area6,09 m²
  • Usable area5,13 m²
  • Mass of the main part6,25 t
  • Mass of the roofem>1,95 t
  • Total mass8,2 t

Internal maintenance

KSW enclosure

KSW enclosures allow execution of buildings with external as well as internal maintenance, combined with the cable basement that constitutes a separate monolith. The variable width of the enclosure (2550 mm or 2960 mm) allows to customise the enclosure to the requirements.

KSW 255 enclosure

The KSW 255 container enclosure, with its mobility, will find many areas of application. The main are: professional power engineering transformer stations, industrial stations, section compartments, generator rooms, and custom solutions.

The width of the enclosure is 2550 mm, and the length may be selected in the range from 3000 mm to 8000 mm, with 200 mm steps. The enclosure consists of three independent reinforced concrete elements (the cable basement, the body along with the floor, and the roof) executed as monolithic structures. The height inside the body is 2450 mm.

The enclosure can be provided with steel (on request: aluminium) door joinery, ventilation grates, door and roof fans or other access elements. The layout of the devices is determined for the optimum development of the solution in terms of technical and economic aspects.

  • External width3 up to 8 m
  • External length2,55 m
  • Total height3,62 m
  • Height after setting (from the ground level)2,82 m
  • Development area7,65 up to 20,40 m²
  • Usable area6,48 up to 18,10 m²
  • Mass of the main part16,8 up to 38,3 t

KSW 296 enclosure

The KSW 296 container enclosure, with its mobility, will find many areas of application. The main are: professional power engineering transformer stations, industrial stations, section compartments, generator rooms, and custom solutions.

The width of the enclosure is 2960 mm, and the length may be selected in the range from 2960 mm to 6960 mm, with 200 mm steps. The enclosure consists of three independent reinforced concrete elements (the cable basement, the body along with the floor, and the roof) executed as monolithic structures. The height inside the main part is 2820 and may be reduced on request to 2450.

The enclosure can be provided with steel (on request of the client: aluminium) door joinery, ventilation grates, door and roof fans or other access elements. The layout of the devices is determined for the optimum development of the solution in terms of technical and economic aspects.

  • External width2,96 up to 6,96 m
  • External length2,96 m
  • Total height3,64 up to 4,01 m
  • Height after setting (from the ground level)2,84 up to 3,21 m
  • Development area8,76 up to 20,60 m²
  • Usable area7,45 up to 18,38 m²
  • Mass of the main part20,1 up to 40,1 t

Large-size enclosures: custom designs

With the equipment designed whose dimensions exceed the possibility of housing in a single enclosure, multi-segment enclosures may be configured.

The buildings may be connected with shorter or longer walls. Flashings are supplied for the connections of the buildings.

The selected devices have to be optimally laid out. We will present proposed solutions of the facility in arrangement with the client.

  • External width2,96 up to 5,92 m
  • External length8,54 up to 13,96 m
  • Height after setting (from the ground level)3,21 up to 3,35 m

Door joinery and ventilation

In principle, doors and ventilation grates are made of high-quality galvanised steel sheet, powder painted in the agreed RAL colour. For individual needs, aluminium joinery may be provided. Doors are fitted, according to the needs, with air grates ensuring cooling of the devices, and a three-point lock with the MasterKey insert. The above drawings present typical doors and ventilation grates for KSW enclosures. Other dimensions are possible for custom orders.

Lighting and earthing installations

The station is fitted with the electric lighting installation and the 230 V sockets installation. The installations are run on the surface of the walls in protective pipes. The installation is powered from the auxiliaries cubicle of the LV switchgear or from external sources.

The main inner earthing ring is made with flat bar banding steel 40×5 marked yellow-green. The protective earthing inside the station is made with a copper cord connected to the screw terminal in the banding steel connected to the foundation block or ring earth electrode.

Other connections of the earthing installation are executed in the same way, i.e. metal parts of devices station, metal elements of the construction steel structures of the switchgears and of the transformer.

Fans

To improve air circulation in the transformer room, mechanical ventilation systems may be used. Both door and roof fans may be provided.

Fire curtains: fire dampers

Fire curtains are provided for these transformers that require ventilation in the side or back walls of the transformer room, with the simultaneous requirement of REI120 fire resistance class (fire dampers by, e.g. Mercor S.A.). These dampers are made of a double case with the rectangular cross section, a moving separating barrier in the form of a falling foldable curtain, and a trigger and control mechanism activated with a heat sensor mechanism. The isolating barrier is made of stainless steel.

The selection of the dampers and the development of the control system are provided in accordance with the requirements of the given solution. On request of the client, system passages are installed, e.g. by Roxtec or Hauff-Technik.

Sealing systems

All enclosures and transformer stations may be fitted with sealing systems for low and medium voltage cables. In the basic variant, PVC pipes with heat shrink cable passages are used to run MV cables, e.g. AKB5, with penetration sleeves used for LV cables, produced by Strunobet-Migacz Sp. z o.o., in the FeZn type, with a heat shrink pipe.

Variants of roofs and colour schemes

See the images above.

Devices

The systems are customised to meet the needs of the Client and the requirements of the professional power engineering. The offered solutions take into consideration optimisation of execution in terms of technical and economic aspects. To meet the needs of a broad group of clients, our stations are approved for use in professional power engineering applications with the following types of switchgears.

The execution of the specific station takes also into consideration the possibility of using different devices. The details of the products used are provided in the catalogues and in the operating and maintenance manuals of the devices, in the relevant resources of their producers.

MV switchgears

We use switchgears from several producers, custom selected for the individual needs. We use switchgears with air insulation and SF6 insulation. The switchgears are ready for operation in Smart Grid networks.

The switchgears are made with single cubicles of any equipment; when connected, they make up a fully functional switchgear system.

The configuration and parameters of the switchgear depend on the selected producer. We offer, among others: Strunobet – RSS/RSSw, Schneider – RM6, SM6, ABB – SafePlus, SafeRing, UniSec, Efacec – Normafix, Fluofix, Eaton – Xiria, Siemens, 8DJH.

The following cubicles are available:

  • Feeder bays;
  • Circuit breaker bay;
  • Transformer bay;
  • Metering bay;
  • Coupling bay;
  • Busbar bay;
  • Fuse bay.
  • Basic technical data
  • Rated voltage17,5 kV / 24 kV
  • Insulation rated voltage95 / 38 kV or 125 / 50 kV
  • Rated frequency50 Hz
  • Network frequency proof voltage50 kV
  • Impulse withstand voltage2,5 kV
  • Lightning impulse proof voltage125 kV
  • Rated continuous current630 A
  • Rated short-time withstand current16 / 20 / 21 kA
  • Rated peak withstand current40 / 50 kA
  • Internal arc short-circuit current16 kA
  • IP protection level2X, 3X, IP31D, IP4X
  • Height / width / depthdepending on the selected producer

Transformer

The transformer is individually selected taking into account the parameters of the power supply, quality and characteristics of the facility.

LV RWT switchgear

Enclosure

  • Compact, lightweight modular design ensuring the required rigidity of the structure; made of steel galvanised or aluminium profiles connected with cast aluminium or polyamide connectors that enable connection of individual elements without any tools;
  • High mechanical strength and protection level to prevent penetration of dust and mechanical damages;
  • Fully covered, , with covers made of steel sheet with an anti-corrosion coat, powder painted in any colour, provided as fixed or tilting units for easy inspections and thermography observation;
  • The internal space with isolated parts: functional modules, current circuits;
  • It allows to change the power supply side by replacement of the switchgear power supply module or installation of the metering module;
  • Connection of the modules with screws (without riveting or welding) for quick removal of the modules, delivery of the switchgear in modules to the place of installation (when space is limited) and assembly on site;
  • Set on an additional frame matching the dimensions of the cable duct;
  • The switchgear can be built to any dimensions, to meet the specific needs of the Client;
  • Angular connection of modules, e.g. at 90°;
  • Eyebolts for (travelling) crane transport;
  • Marking of the switchgear with permanent engraved plastic plates to enable identification of all key elements;

Current circuits

  • The current circuits of the incoming and outgoing modules made of screwed copper flat bars with the cross section adjusted to current load, fitted with pressed rivet nuts to enable installation of rail components when energised;
  • The connection strip for the terminal of portable earthing devices.

Configuration

MZ incoming module

  • The power supply for the module is provided with busbars or cables with brass terminals ZLM-2×300 to the current circuit strips;
  • The incoming busbar bridge fully covered;
  • (Fuse) insulator switch or power switch up to 2500 A;
  • The earthing clamps for connection of earthing devices;
  • The module may be optionally fitted with PK/EQ.

MO outgoing module

  • Disconnecting switches or fuse bases (strip-mounted or moulded-case types);
  • The module is optionally fitted with additional elements, e.g. generator terminals;
  • Covered redundancy circuits;
  • Cable clamps.

MP – the metering and balancing module compliant with the guidelines of the energy distributor and seller;

SON – the lighting module, the control circuit for street lighting of the traffic route in the vicinity of the station;

OPW – auxiliaries circuits, station lighting (16A/D01), 230 V socket (16A/A01);

PK/EQ – monitoring, analysis of quality of electricity, metering voltage transformers, grid parameters meter (analogue or digital), analyser of electricity quality parameters, communication;

BK – a capacitor to compensate idle running of the transformer / a battery of capacitors.

  • Basic technical data
  • Rated operational voltage230/400 V
  • Insulation rated voltage500/690 V
  • Rated frequency50 Hz
  • Impulse withstand voltage8 kV
  • Busbar rated continuous current1250/1600/2500 A
  • Outgoing busbar rated continuous current160/250/400/630 A
  • Rated short-time withstand current40 kA (1 s.)
  • Rated peak withstand current80 kA
  • Internal arc short-circuit current20 kA
  • Internal arc short-circuit current20 kA
  • IP protection level4X/2X
  • IK level of protection against mechanical impact10
  • Appliance classI
  • Dimensions of incoming / outgoing terminals2 x 4 x 240 mm² / 4 x 240 mm²
  • Network arrangementsTN-S, TN-C, TN-C-S, TT, IT
  • Height / width / depthwithout limitations

Compliance with standards

  • PN-EN 61439-1 – „Low-voltage switchgear and controlgear assemblies. Part 1: General rules”;
  • PN-EN 61439-2 – „Low-voltage switchgear and controlgear assemblies – Part 2: Power switchgear and controlgear assemblies”;
  • PN-E-05163 – „Enclosed low-voltage switchgear and controlgear assemblies. Guide for testing under conditions of arcing due to internal fault”;
  • PN-EN 50274 – „Low-voltage switchgear and controlgear assemblies – Protection against electric shock – Protection against unintentional direct contact with hazardous live parts”;
  • PN-EN 60529 – „Degrees of protection provided by enclosures (IP Code)”;
  • PN-EN ISO 4628 – „Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 6: Assessment of degree of chalking by tape method”;
  • PN-EN ISO 2409 – „Paints and varnishes – Cross-cut test..

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