Packaged switchgear units (outdoor metal-clad switchgear)
Outdoor packaged switchgear units of the 35 (10.6) / 0.4 kV series (hereinafter the outdoor packaged switchgear unit) with transformers rated up to 4.0 MVA are designed for receiving, converting and distributing three-phase AC electrical energy at the industrial frequency of 50 Hz at a rated voltage of 35 (10.6) / 0.4 kV.
The outdoor packaged switchgear units are intended for operation under the conditions specified for the UHL design, placement category 1, in accordance with GOST 15150-69.
Designation structure
Example of a designation entry when ordering: an outdoor packaged switchgear unit with two power transformers rated at 630 kVA each, for a rated HV voltage of 10 kV, for a rated LV voltage of 0.4 kV, climatic design – UHL, placement category – 1.
Main technical specifications
| Parameter name | Parameter value |
|---|---|
| Power transformer rating, MVA | up to 4 |
| Number of power transformers | 1 or 2 |
| Rated voltage on the HV side, kV | 35 (10; 6) |
| Highest operating voltage on the HV side, kV | 40.5 (12; 7.2) |
| Rated voltage on the LV side, kV | 0.4 |
| Electrodynamic withstand current on the HV side, kA | 52 |
| Electrodynamic withstand current on the LV side, kA | 41 |
| Thermal withstand current on the HV side for 3 s, kA | 20 |
| Thermal withstand current on the LV side for 3 s, kA | 16 |
| Rated voltage of auxiliary circuits, D | up to 220 |
| Climatic design to GOST 15150-69 | UHL1 |
Design
The outdoor packaged switchgear unit consists of transportable modules made of sandwich panels up to 2600 mm wide. Depending on its purpose, it can be fitted with cabinets from 0.4 to 35 kV, power transformers and control-panel boards. The cabinets are arranged in a single or double row with single-sided or double-sided servicing (depending on the cabinet type). The width of the maintenance corridor is at least 800 mm.
As thermal insulation materials, three-layer “sandwich” panels with a filler of non-combustible mineral wool from 50 to 100 mm thick (at the customer’s request) are used. The end modules (located at the ends) serve as enclosing and thermal-insulation structures and have doors that allow cabinets or equipment to be transported during their repair or replacement.
A distribution cabinet for supplying the substation’s own needs is installed on the wall of the LV-0.4 switchgear compartment.
Design features
The outdoor packaged switchgear unit may consist of three or more modules:
- HV switchgear for 35 (10; 6) kV;
- power transformer compartment;
- LV switchgear for 0.4 kV.
The number of required modules is determined on the basis of the questionnaire. Each module is assembled by the manufacturer. After transportation, installation is carried out at the site. Installation of the modules is carried out directly by the customer!
Lighting, ventilation, heating and other elements are installed in the compartments (depending on what is specified in the questionnaire). The wiring of the auxiliary heating, lighting and ventilation circuits is installed in the compartments at the manufacturer’s plant. During installation of the outdoor packaged switchgear unit, it is only necessary to interconnect the circuits of adjacent modules according to the wiring diagram.
If necessary, air-conditioning, heating and climate-control systems, as well as security and fire alarm systems, can be installed.
An internal earthing loop is provided in the outdoor packaged switchgear unit, and the
possibility of connecting to the substation’s external earthing loop is foreseen.
RAL-9006 is used as the default colour (it can be changed at the customer’s request).
The foundations for the substation are designed by a design organization. The outdoor packaged switchgear unit is installed on a pile foundation. The elevation of the top of the foundation is taken as 0.5-2.2 m.
A foundation frame made of No. 16 channels is installed on the piles. When installing on the foundation, the base of the building must be welded to the foundation frame around the perimeter with a fillet weld of 6-8 mm leg, with a weld length of 200 mm and a spacing of 1000 mm.
Reinforced-concrete structures are not included in the manufacturer’s supply!
An order for the manufacture of a modular building of the outdoor packaged switchgear unit type is placed together with the order for the switchgear cabinets in the form of a questionnaire.
The following information must additionally be specified in the questionnaire:
- internal lighting of the outdoor packaged switchgear unit – yes (default);
- external lighting of the outdoor packaged switchgear unit – yes (default);
- heating of the outdoor packaged switchgear unit compartments:
- 10 kV switchgear compartment – no (default);
- 0.4 kV switchgear compartment – no (default);
- transformer compartment – no (default);
- ventilation of the outdoor packaged switchgear unit compartments:
- 10 kV switchgear compartment – natural (default)/forced;
- 0.4 kV switchgear compartment – natural (default)/forced;
- transformer compartment – natural (default)/forced;
- security alarm – no (default);
- fire alarm – no (default);
- air-conditioning – no (default);
- sandwich panel thickness – 100 mm (default);
- enclosure colour – RAL-9006 (default).
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FREQUENTLY ASKED QUESTIONS
An outdoor packaged switchgear unit (enclosed design) is an insulated, factory-built block-modular building inside which the high-voltage cubicles (metal-clad switchgear) are installed. The main difference from KRUN (an outdoor cabinet) is the presence of a maintenance corridor. Staff enter the building and work with the equipment in warmth and comfort, regardless of the weather outside, which is critically important for complex repairs and inspections.
It is the best solution for: 1. Solar (PV) and wind power plants: as a central distribution point for collecting power. 2. Industrial enterprises: to replace old brick substations. 3. Oil and gas fields: where rapid deployment of a power system in an open field is required.
- Speed: manufacturing a module takes several weeks, whereas major construction lasts for months. - Paperwork: the outdoor packaged switchgear unit is legally considered "equipment" rather than "real estate", which significantly simplifies obtaining installation permits. - Quality: all connections are assembled and tested at the factory, not in the dust of a construction site.
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