Medium-voltage instrument transformers
Special transformer
VTDOR 38
Voltage transformers VTDOR 38 are single-phase transformers isolated with double-poles. They are designed for intdoor (or outdoor in shelter) mounting in the high voltage systems of 6 kV. They are designed above all for power supply of automatic track safety appliances with power take-off of 230 V,0-1.2 kVA at 50-75 Hz and furthermore as the sources for general use. The construction of instrument is basedon the requirements of Czech Railways for the transformers supplying safety appliances and also on the measuring transformers.
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Description
Voltage transformers VTDOR 38 are single-phase transformers isolated with double-poles. They are designed for intdoor (or outdoor in shelter) mounting in the high voltage systems of 6 kV. They are designed above all for power supply of automatic track safety appliances with power take-off of 230 V,0-1.2 kVA at 50-75 Hz and furthermore as the sources for general use. The construction of instrument is basedon the requirements of Czech Railways for the transformers supplying safety appliances and also on the measuring transformers.
The instruments satisfy the tests of standards ČSN EN 61869-3. Technical parameters are listed in the previous table.
Transformers are fixed by the means of four screws M12 in the holes in the basic frame. For the mounting of transformers into thetransformation stations that have already been built it is possible to use auxiliary suspension frame. This frame can be supplied as fixings.
Metal parts of transformer are cold-galvanized, electrically conductive areas are nickeled. The outlets of primary windings “A” and “X” are brought out by the means of screw bolts M10. For contacting them we recommend use conductors of maximumdiameter of 6 mm2 and terminal ends by reason of suspension of dynamic forces and vibrations within the system.
ATTENTION! The isolators must not be pre-stressed mechanically in the direction away from the body of transformer during the other way of contacting. We recommend use terminal ends corresponding to the used cross-section of the conductor for attaching to the secondary outlets.
The secondary terminal board is covered with the waterproof cover. It is possible to seal the cover.
The transformers were developed especially for the purposes of the Czech Railways.
Parameters
- Highest voltage for equipment: 3.6/7.2 kV
- Power frequency test voltage: 10/20 kV
- Lightning impulse test voltage: 40/60 kV
- Nominal primary voltage: 5 150 – 6 300 V
- Nominal secondary voltage: 230 V
- Short-circuit voltage: 4.5%
- Max power: 1,2 kVA
- Nominal frequency: 50 Hz
- Weight: 51 kg
- Thermal insulation class: E
- Operation conditions: -5/+40
- Standard: ČSN EN 61869-1, ČSN EN 61869-3, IEC EN 61869-1, IEC EN 61869-3, GOST 15 150
Attached files
Drawing
