ZILINSKIS · MV 15 kV
Construction of the RS Maliniec 15 kV MV switching station with feeder lines and the necessary network rebuild in Konin
For ZILINSKIS Sp. z o.o. we built the cable lines feeding the new RS Maliniec switching station: 6 MV sections in 3×XRUHAKXS 1×240/50 mm² totalling 2,890 m and a 2,520 m line in 3×XRUHAKXS 1×240/25 mm². We installed a 3-way ZKSN junction, completed ~350 m of directional drilling and 18 sets of joints and terminations. Value of the works: PLN 642,000 net.
| Client | ZILINSKIS Sp. z o.o. |
|---|---|
| Location | Konin — rozdzielnia sieciowa 15 kV RS Maliniec Greater Poland Voivodeship |
| Voltage | SN-15 kV |
| BIGBUD's role | Construction subcontractor |
| Net value | PLN 642,000 net |
| Completion period | 14 Aug 2025 – 20 Mar 2026 |
The task
A new MV network node in Konin
ZILINSKIS Sp. z o.o. is a contractor working in the power sector, for which BIGBUD had already undergrounded an MV line in Toruń. That job was followed by another contract, again as the construction subcontractor.
The task was titled „Budowa rozdzielni sieciowej średniego napięcia 15kV RS Maliniec wraz z budową linii zasilających oraz niezbędną przebudową sieci w miejscowości Konin, gmina miejska” — construction of the RS Maliniec 15 kV switching station with feeder lines and the necessary network rebuild. A switching station (RS) is a node of the MV network where feeder lines converge and from which lines run out to transformer substations. Our scope was the cable work: feeder lines, network rebuild, the ZKSN junction and cable accessories.
Period: 14 August 2025 – 20 March 2026 — the schedule also covered the winter months.
How the works went
Feeder lines, junction and accessories
The general course of such works, mapped to the quantities in the reference letter.
Routes in a town
In a town, a cable route has to avoid existing utilities — water, gas, telecoms and other power cables. Routes are set out by a surveyor before trenching, and conflict points are checked with trial holes. Where an open trench would disrupt traffic or damage surfaces, drilling is used.
Scope of works
- setting out the line routes
- directional drilling — ~350 m in total
- agreements with land and utility owners
Feeder lines for the station
Six MV cable sections in 3×XRUHAKXS 1×240/50 mm² totalling 2,890 m were built, plus a 2,520 m line in 3×XRUHAKXS 1×240/25 mm². 240 mm² cables are used on more heavily loaded lines — and feeders to a network node are exactly that.
Result
- 2,890 m of 1×240/50 mm² line (6 sections)
- 2,520 m of 1×240/25 mm² line
ZKSN junction on ul. Rybacka
A 3-way ZKSN cable junction was installed on ul. Rybacka in Konin. Installation covers preparing the base or foundation, setting the enclosure, bringing in the cables and connecting them to the junction's fields.
Scope of works
- installation of a 3-way ZKSN junction
- cable entry and connection
Cable accessories — 18 sets
The range of accessories reflects the variety of connection points: 6 sets of MV joints connecting cable lengths, 6 sets of straight indoor terminations (cable ends in indoor switchgear), 4 sets of outdoor terminations (transitions from cable to overhead line) and 2 sets of connector terminations.
Scope of works
- MV joints — 6 sets
- straight indoor terminations — 6 sets
- outdoor terminations — 4 sets
- connector terminations — 2 sets
Testing and documentation
Once installation is complete, the lines undergo acceptance tests and measurements, an as-built geodetic survey is carried out and the documentation is handed to the client.
Result
- lines ready for connection into the network
Technology
XRUHAKXS 1×240/50, a 3-way ZKSN and four kinds of accessories
A general explanation of the elements of the contract.
What XRUHAKXS 1×240/50 mm² means
XRUHAKXS is a single-core MV cable with an aluminium conductor and XLPE insulation, a copper wire screen with longitudinal water-blocking and a reinforced PE sheath. “1×240” is one conductor of 240 mm² and “/50” is the cross-section of the screen. A larger screen (50 rather than 25 mm²) is chosen, among other things, for the fault currents expected at that point of the network. More in MV cables.
A 3-way ZKSN junction
An MV cable junction is made up of fields (ways) — each field is a separate connection for one cable line with its own switching equipment. A 3-way junction can, for example, take an incoming feeder, pass the line on and supply a branch, letting the operator sectionalise the network.
Indoor, outdoor and connector terminations
A cable termination ends the cable and controls the electric field where the screen stops. Indoor terminations go into switchgear inside buildings, outdoor ones onto poles where cable meets overhead line, and connector (plug-in) terminations into junctions and switchgear with bushings.
Drilling in a town
In built-up areas directional drilling lets a line pass under a carriageway, pavement or tram track without tearing it up. We run our own GRUNDODRILL Tracto Technik 15 XPT rig — see our equipment and horizontal directional drilling.
What this project shows
A returning client, a larger cross-section, more accessories
Compared with Toruń, the Konin lines used larger cables (240 mm² instead of 150 mm²), and the accessories covered four kinds of item — from joints to indoor, outdoor and connector terminations. That is typical of work around a network node: each line ends in a different type of equipment and needs a different termination.
What matters most to the client is that a repeat contract from the same general contractor ended with the same result — performed properly, on the agreed dates and without defects.
- second contract for ZILINSKIS Sp. z o.o.
- 7 MV cable lines, 5,410 m in total
- 18 sets of joints and terminations of four kinds
„The above-mentioned works carried out by BIGBUD Sp. z o.o. were performed properly, in accordance with good construction practice, on the agreed dates and without defects.”
See also
MV and LV cable lines
Construction, rebuilding and repair of MV 6–30 kV and LV 0.4 kV cable lines: trenching, drilling, cable laying, joints, terminations, testing and handover.
Learn moreUtility conflict relocation
Relocating MV and LV networks that clash with roads, railways and new developments: cable diversions, undergrounding, HDD, DSO outages and acceptance.
Learn moreToruń — MV 15 kV line undergrounding
MV 15 kV line undergrounding in Toruń for ZILINSKIS: 5,725 m of 3× XRUHAKXS 1×150 mm², 2 ZKSN junctions, ~600 m of directional drilling. PLN 682,000 net.
Learn moreBuilding a switching station or rebuilding an MV network in town?
We will deliver the cable lines, drilling and accessories — send us the design and we will reply with a quote and schedule.