![[:uk]Gerb4002-green[:]](https://uea.com.ua/wp-content/uploads/2024/11/Gerb4002-green-150x150.png)
Power transformers play a critical role in power supply systems, ensuring efficient distribution of electrical energy. Transformers designed for specific operating conditions and industrial needs, particularly for railway transport, are of special importance. Power transformers of TMZh type, manufactured by LLC “UKRELEKTROAPARAT”, are oil-filled step-down three-phase double-winding transformers intended for powering electrical equipment of alternating current electrified railways, and are available in capacities from 25 to 2500 kVA.
Design Features
TMZh transformers possess a set of technical parameters that determine their functionality and suitability for use in railway electrical networks. Understanding these characteristics is important for the correct selection and operation of the equipment.
- Welded rectangular tanks with radiators for efficient cooling.
- Presence of special hooks for lifting the assembled transformer.
- Location on the tank of necessary elements for oil maintenance (plugs for filling, draining, taking samples) and a grounding bolt.
- Active part consisting of windings, a high-voltage switch, and a magnetic core made of high-quality steel, manufactured using modern technology (cutting on a «GEORG» line, «Step-Lap» stacking).
- Outdoor removable HV and LV bushings with porcelain insulators, located on the lid.
- Possibility of equipping with contact terminals for different busbar cross-sections.
- Oil conservator for compensating thermal expansion of the oil and an oil level indicator with marks for different temperature regimes.
- Installation of a thermometer for monitoring the temperature of the upper oil layers.
Technical Specifications of TMZh Transformers
Parameters of TMZh type transformers with capacities from 25 to 2500 kV*A
| Type | TMZh-25 | TMZh-40 | TMZh-63 | TMZh-100 | TMZh-160 | TMZh-250 | TMZh-400 | TMZh-630 | TMZh-1000 | TMZh-1600 | TMZh-2500 | |
| No-load losses. W | 145 | 200 | 265 | 420 | 480 | 700 | 950 | 1180 | 1650 | 2100 | 2900 | |
| No-load current % | 3,1 | 2,6 | 2,3 | 2,1 | 2 | 1,2 | 1 | 0,9 | 0,8 | 0,7 | 0,6 | |
| Short-circuit losses, W | 680 | 880 | 1160 | 1920 | 2650 | 3700 | 5500 | 7100 | 12200 | 17000 | 28500 | |
| Short-circuit voltage % | 6,5 | 6,5 | 6,5 | 6,5 | 6,5 | 6,5 | 6,5 | 6,5 | 7 | 7,2 | 7,2 | |
|
Size, mm.
|
L | 1205 | 1410 | 1490 | 1260 | 1335 | 1340 | 1395 | 1800 | 2315 | 1965 | 2450 |
| B | 890 | 895 | 930 | 1060 | 970 | 975 | 975 | 1200 | 1100 | 1250 | 1420 | |
| H | 1430 | 1565 | 1590 | 1725 | 1730 | 1810 | 1830 | 1950 | 2360 | 2505 | 2825 | |
| D | 365 | 365 | 435 | 365 | 305 | 305 | 305 | 440 | 440 | 440 | 440 | |
| A | 365 | 365 | 435 | 365 | 305 | 305 | 305 | 440 | 440 | 440 | 440 | |
| E | 90 | 90 | 90 | 90 | 100 | 110 | 120 | 180 | 180 | 180 | 200 | |
| F | 90 | 90 | 90 | 90 | 100 | 110 | 120 | 180 | 180 | 180 | 200 | |
| M | 170 | 150 | 160 | 180 | 180 | 180 | 180 | 180 | 200 | 180 | 220 | |
| N | 150 | 120 | 120 | 145 | 110 | 115 | 133 | 130 | 200 | 160 | 180 | |
| K | 450х550 | 550 | 550 | 550 | 660 | 660 | 820 | 820 | 1070 | 1070 | 1070 | |
| C | 835 | 910 | 930 | 990 | 1145 | 1230 | 1250 | 1380 | 1940 | 2080 | 2400 | |
| Oil mass, kg | 225 | 295 | 310 | 350 | 370 | 405 | 435 | 740 | 900 | 1000 | 1880 | |
| Mass, kg. | 605 | 800 | 920 | 1275 | 1630 | 1710 | 2210 | 2900 | 3210 | 4850 | 6980 | |
Dimensions
Advantages of Using TMZh Transformers
The use of TMZh transformers in railway power supply systems provides a number of significant advantages due to their design and technical characteristics. These advantages ensure the reliability, efficiency, and durability of the equipment under the specific operating conditions of railway transport.
- Efficient cooling through the use of oil as a heat transfer medium, which allows withstanding significant loads.
- High electrical insulation strength due to the immersion of the active part in transformer oil.
- Possibility of voltage regulation to optimize electrical network parameters.
- Reliability and long service life with proper technical maintenance.
- Suitability for outdoor installation.
- Resistance to overloads compared to some other types of transformers.
- Protection of internal components from corrosion, moisture, and contamination due to the oil environment and structural features of the tank.
Areas of Application
TMZh type transformers are developed taking into account the specific needs and operating conditions of a certain energy sector. Their main purpose is clearly defined by the manufacturer, which emphasizes their specialization.
- TMZh transformers are intended for powering the electrical equipment of railways electrified with alternating current.
Compliance with Standards
The production of TMZh transformers and their characteristics comply with the requirements of leading international and national standards. This confirms the high quality of the products and their suitability for use in the relevant areas.
- Transformers comply with IEC-60076 standards.
- Comply with GOST R 52719-2007.
- Comply with TU UZ.49-05758084-048-99.
- Production is certified according to ISO 9001:2008.
The choice of a TMZh transformer depends on the voltage, installation location, and operating conditions. To get precise characteristics of transformers or to place an order, please contact the official representative of LLC “Ukrelectroapparat” or write to the email address zakaz@uea.km.ua.