Compact air-insulated 12–24 kV switchgear for transformer substations
Air-insulated medium-voltage monoblock for transformer substations without a service aisle, including concrete ones. Rated voltage 12 or 24 kV, rated current 630 A. Each unit has at least one cable and one transformer connection.
- Rated voltage
- 12 and 24 kV
- Rated current
- 630 A; transformer connection 125 A (fuses)
- Short-time withstand current
- up to 20 kA, 1 s (12 kV)
- Peak withstand current
- up to 50 kA
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The monoblock is designed for substations with no service aisle. It is installed and transported as a single block, not as separate panels. It is used in distribution transformer substations of utilities, industrial and commercial consumers and charging infrastructure. Installation is intended in closed electrical rooms at altitudes of up to 1000 m above sea level, and above that the insulation level must be corrected.
Frequency 50 Hz. Short-time withstand current up to 20 kA for 1 s, peak withstand current up to 50 kA (12 kV class). Lightning impulse 75 / 125 kV and short-duration withstand voltage 28 / 50 kV for the 12 / 24 kV classes respectively. The transformer connection is made as a load-break switch–fuse combination for 125 A with HV fuses. Internal arc withstand was tested by an independent institute at 16, 20 and 25 kA for 1 s, with pressure relieved downward. Degree of protection IP3X. Compliance with EN 62271-200, EN 62271-1 and VDE 0682-552.
The range includes the versions D 12-127014 (about 390 kg), D 12-147014 (480 kg), D 24-121114 (630 kg), D 24-171114 (590 kg) and D 24-211114 (960 kg). The D 12 versions belong to the 12 kV class and D 24 to the 24 kV class. The height above the floor is 1600 mm. Cable panels are equipped with H 27 EK load-break switches, and transformer panels with H 27 SEA or H 27 SuT combinations. Earthing switches, current and voltage transformers, surge arresters and sockets for capacitive voltage indication are available as options.
The structure is metal, the frame is hot-dip galvanized, and the front doors have inspection windows. Interlocks and insulating protective barriers are provided for the duration of work. The interlocks rule out erroneous operations, and the barriers separate live parts from the work area. The weight of the versions, 390–960 kg, is taken into account for transportation and foundation selection. In the typical substation from the brochure, the switchgear supplies a transformer of up to 2500 kVA, and the LV distribution is built on system 403 with an incomer of up to 1250 A and up to ten feeders of 400 or 630 A.
Technical specifications
| Rated voltage | 12 and 24 kV |
|---|---|
| Rated current | 630 A; transformer connection 125 A (fuses) |
| Short-time withstand current | up to 20 kA, 1 s (12 kV) |
| Peak withstand current | up to 50 kA |
| Insulation level | 28/75 kV (12 kV), 50/125 kV (24 kV) |
| Arc withstand | 16, 20, 25 kA, 1 s |
| Types | D12-127014, D12-147014, D24-121114, D24-171114, D24-211114 (390–960 kg) |
| Transformer power | up to 2500 kVA |
| Degree of protection | IP3X |
| Standards | EN 62271-200, EN 62271-1, VDE 0682-552 |
Request a price and lead time
Compact air-insulated 12–24 kV switchgear for transformer substations. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What voltage classes and current does this switchgear have?
Classes 12 and 24 kV, rated current 630 A. The transformer connection is made for 125 A with HV fuses.
What internal arc withstand does it have?
Tests by an independent institute were performed at 16, 20 and 25 kA for 1 s, with pressure relieved downward.
What transformer power is the switchgear intended for?
In the typical substation from the brochure it supplies a transformer of up to 2500 kVA. The height above the floor is 1600 mm, and the weight of the versions is 390–960 kg.
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