Power transformer | 2500kVA | 10kV/0.4kV | Yyn0 | TMX 250/10 | ONAN | IP54/IP00 | Elprom | 34211.00.06 | 153469

Technical Specifications

Manufacturer: Elprom
Country of origin: Bulgaria (Kyustendil)
Model: TMX 250/10
Year of manufacture: 2018
Standard: EN 60076

Electrical Parameters:

Rated power: 250 kVA
Vector group: Yyn0

High voltage (HV):
10500 V – 13.75 A
10250 V – 14.8 A
10000 V – 14.43 A
9750 V – 14.8 A
9500 V – 15.19 A

Low voltage (LV): 420 V – 343.66 A
Um: 12 / 1.1 kV
Impedance (at 75°C): 3.77 %

Losses:

Short-circuit losses (Pk): 3354.74 W
No-load losses (Po): 314.31 W

Insulation and Cooling:

Insulation level: LI75 AC28 / LI – AC5
Cooling type: ONAN (natural oil and air circulation)
Oil: PCB-free (complies with EN 12766)

Temperature Parameters:

Maximum oil temperature: 100°C
Ambient temperature: up to +40°C
Winding temperature rise: 65°C

Construction:

Winding material: aluminium / aluminium (Al/Al)
Electrical steel: grain-oriented steel
Protection class: IP54 / IP00
Tap changer: off-load (operable only when de-energized)

Weight:

Transformer: 135 kg
Active part: 670 kg
Oil: 225 kg
Total weight: 1075 kg

Note: transformer is hermetically sealed – do not open

Functions

Efficient voltage transformation from 10 kV to 0.4 kV
Stable power supply for industrial and commercial applications
Adjustable voltage via tap changer (off-load)
Optimized energy losses – reduced operating costs
Durable construction using high-quality electrical steel
Safe operation due to hermetically sealed design

Applications

Industry:
Manufacturing facilities
Power distribution substations
Supply of high-power equipment

Infrastructure projects:
Commercial buildings
Logistics centers
Energy networks

For engineers:
Design of electrical networks
Optimization of power distribution systems
Implementation of reliable transformer solutions

For electricians:
Transformer installation and connection
Operation and maintenance works
Reconstruction and modernization projects

Advantages

High quality in accordance with EN 60076
Low no-load and load losses
Hermetically sealed – minimal maintenance
Resistant to temperature fluctuations
Reliable ONAN cooling system
Long service life due to quality materials
Safe PCB-free oil

Disadvantages

High weight – requires special transport and installation equipment
Tap changing only when de-energized
Requires proper ventilation at installation site
Non-openable design (limited on-site repair possibilities)