HV voltage transformers VT
Application and construction
Catalogue
These instruments voltage transformers are intended for measuring and protection of high-voltage distribution systems of the indoor as well as outdoor type, for the highest voltage of the system of 3.6 – 40.5 kV. More detailed data about the offered products can be found in below tables.
The transformers comply with requirements of IEC 60044-1, IEC 60044-2, ČSN EN 60044-1, ČSN EN 60044-2, GOST 1983-89 and DIN 42600/1983.
Installation instructions
The mounting position of the instrument transformers VTS and VTD is arbitrary. The transformers VTO and VPT are only mounted in the vertical position. The transformers are fixed by the means of four screws M10 (VTS 12 and VTD 12) or M12 (VTS 25, VTS 38,VTD 25, VTO 38) in the holes in the basic plate or in the profiles. The connection of high voltage to the primary side is recommended by the means of the terminal ends with 10 mm and screws M10 with max. torque module 20Nm. The example of mounting system of transformer is shown in picture No. 1 (VTS 12). For the contacting on the high voltage side of transformers with isolators we recommend to use the conductors of maximum diameter of 6 mm2 and terminal ends by the reason of springing of the dynamic forces within the system.
ATTENTION: The isolators must not be pre-stressed mechanically in the direction away from the body of transformer during the mounting process.
We recommend clean transformers from dirt and draw close the connections in case of shut down.
OUTDOOR types
Type | PDF | Insulation voltage UN [V] | Primary voltage UN [V] | Secondary voltage UN [V] | Power [VA] | Number of insulators | Weight [kg] |
VPT 25 |
-
| 25 | 3000-22000 | 100, 110, 120 | 10-150 | 2 | 49 |
VPT 38 |
-
| 38,5 | 3000-35000 | 100, 110, 120 | 10-150 | 2 | 62 |
VTO 15 |
-
| 17,5 | 577-8660 | 58, 63, 69 | 30-150 | 1 | 24 |
VTO 38 |
-
| 38,5 | 1732-20207 | 58, 63, 69 | 10-150 | 1 | 49 |
INDOOR types
Type | PDF | Insulation voltage UN [V] | Primary voltage UN [V] | Secondary voltage UN [V] | Power [VA] | Number of insulators | Weight [kg] |
VTS 12 |
-
| 17,5 | 1730-8660 | 58, 63, 69 | 10-150 | 1 | 21 |
VTS 25 |
-
| 25 | 1730-12700 | 58, 63, 69 | 10-150 | 1 | 29 |
VTS 38 |
-
| 40,5 | 1730-20200 | 58, 63, 69 | 10-150 | 1 | 33 |
VTD 12 |
-
| 17,5 | 3000-15000 | 100, 110, 120 | 10-150 | 2 | 22 |
VTD 25 |
-
| 25 | 3000-22000 | 100, 110, 120 | 10-150 | 2 | 29 |