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RSSw MV switchgear

Application

The RSS-24/630 switchgear is intended for use in transformer stations and in medium voltage cable boxes, in particular where solutions with SF6 insulation are not allowed.

Advantages

The advantage of the switchgear is its compact design, with the minimum dimensions of the cubicle as for distribution units (width 615 mm, depth 950 mm, height 1600 mm). The tandem arrangement of disconnecting switches and earthing switches enables an easy system of connection and disconnection, without the necessity of using a drive transfer system. The switchgear features permanent insulation barriers to prevent access to live components. The insulation barrier commonly inserted manually between the contacts of the disconnector for access to the distribution cubicle has been completely eliminated. This system facilitates operations in the distribution cubicle.

The doors of the disconnection and cable bays are set on a system of hooks, the design of which allows easy and reliable closing with guidance. The doors with hooks offer easy access to the inside of the cubicle, especially in the cable boxes. The inspection windows in the doors allow quick visual determination of the position of the disconnector and earthing switches. The system of mechanical locks prevents misconnections and eliminates access to the cubicle with voltage live and earthing switch open.

Relatively small dimensions of the distribution cubicles allow their use as replacement of distribution units with gas insulation (SF6), thus eliminating the SF6 gas inspection and utilisation process.

Equipment

The enclosure is made of aluzinc sheet, riveted and screwed, with the structure executed for easy access to the instruments, which translates into increased safety and intuitive work during installation and operation activities. The system of mechanical locks prevents misconnections and removal of the cover before disconnection of voltage and closing the earthing switch.

The distribution unit employs NAL 24 disconnecting switches by ABB, with air insulation. The distribution cubicles are made in the arc protection standard.

The feeder bay is the basic design, other variants are offered in arrangement with the company.

Basic technical data

  • Rated voltage24 kV
  • Rated frequency50 Hz
  • Network frequency proof voltage50 kV
  • Lightning impulse proof voltage125 kV
  • Rated continuous current630 A
  • Rated withstand current16 kA (3 s.)
  • Rated peak withstand current40 kA
  • Resistance to internal arc16 kA (1 s.)
  • IP protection level3X
  • Height / width / depth1600/550-615/1000 mm

Compliance with standards

  • PN-EN 62271-200:2012 – „High-voltage switchgear and controlgear – Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV”.

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