Application
The stations are designed to supply rural, urban-neighborhood and small-scale industry consumers from a 15 kV or 20 kV medium voltage overhead or cable network.
Design
The station structure is based on E-type spun prestressed concrete poles. It is founded by means of plate or well-shaped stopes.
The substation’s support structure is adapted to fulfill, to a limited extent, the function of a curb pole for medium- and low-voltage lines.
The power supply from the overhead line can be made with AFL 6-35 (50, 70) wire or insulated wire of 35 (50-70) mm2. The station can use transformers of various types without a maintainer with a capacity of up to 630 kVA.
The new generation of MV/LVpole stations takes into account the use of new materials and equipment, as well as new operational requirements, aimed at simplifying operation and increasing operational safety.
Equipment
Supply of MV side
- AFL bare wires 6-35; 50;(70);
- 35;50;(70) insulated cables;
- three-core cables;
- single-coating;
- Single-conductor cables with polyethylene insulation and small sheath.
Transformer power
- typical up to 250 kVA;
- 400 kVA;
- Up to 630 kVA – max. weight of the transformer 2500 kg.
Rod type
- E-type spun prestressed concrete poles.
Insulation
- LWP 8-24, LWP 8-245, LWZ 8-24 standing insulators;
- LP 60/5u, LP 60/8, CS70AA20, CS70AA30, HASDI, SDI pendant insulators.
Degree of tightening
- 0°; 1°; 2°;3°.
Type of soil
- medium and weak.
Type of foundation
- In a drilled hole;
- dug, circle studies;
- slab foundations.
Climate zones
- I, II, III and areas with increased rime.
LV circuits
- Overhead with bare or insulated conductors;
- cables.
LV switchgear
- RST switchgear up to 1250A in an aluminum enclosure in the I or II protection class, equipped with the following modules: power supply and drainage, measurement and balancing, site lighting. Pole-mounted switchgear attached to the station or cable-mounted on the foundation next to the station.
Rated parameters
| Voltage Rating: | 15/0,4 kV; 20/0,4 kV, 30/0,4 kV |
| Rated insulation voltage: | 20 kV |
Station types, transformer weight and power
| STSR type stations | |
| STSR-PO-20/25 – 25 kVA | 350 kg |
| STSR-20/400 – 250 – 400 kVA | 1500 kg |
| STSRp-20/400 – 400 kVA | 2000 kg |
| STSRS type stations | |
| 630 kVA | do 2500 kg |
| STS type stations p (b) | |
| STS-20/40 – do 40 kVA | 350 kg |
| STS-20/100 – do 100 kVA | 750 kg |
| STS-20/250 – 160 – 250 kVA | 1250 kg |
| STS-20/400 – do 400 kVA | 1650 kg |
| STN type stations | |
| STN-20/100 – do 100 kVA | 750 kg |
| STN-20/250 – 160 – 250 kVA | 1250 kg |
| STN-20/400 – 400 kVA | 1650 kg |
| STN-20/630 – 630 kVA | 2150 kg |
