Medium-voltage instrument transformers
Voltage instrument supporting transformer
VTD 25.01
Voltage instrument supporting transformers VTD25.01 are single-phase transformers isolated with double-poles designed for the use in the high voltage systems from 3.6 kV up to 25 kV standardized according ENEL 4141 Ed.III.
They are designed for measuring and protection of high voltage distributing equipment for indoor design.
The values of secondary voltage are 100, 110, 120 V. The accuracy classes for measuring winding are 0.2, 0.5, 1, for the securing winding is 3P or 6P. The transformers satisfy required accuracy class at intervals from 25% to 100% of rated load.
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Description
Voltage instrument supporting transformers VTD25.01 are single-phase transformers isolated with double-poles designed for the use in the high voltage systems from 3.6 kV up to 25 kV standardized according ENEL 4141 Ed.III.
They are designed for measuring and protection of high voltage distributing equipment for indoor design.
The values of secondary voltage are 100, 110, 120 V. The accuracy classes for measuring winding are 0.2, 0.5, 1, for the securing winding is 3P or 6P. The transformers satisfy required accuracy class at intervals from 25% to 100% of rated load.
All active parts of transformer are compound-insulated with epoxy-mixture. This material performs both the electrical insulating and the mechanical functions.
Transformers are fixed by the means of four screws M10 in the holes in the basic plate. The primary terminals of transformers are brought out by the means of nuts M10.
The secondary terminal is adapted to connect the DY4183/1 characterized in DY4390/1
Voltage instrument transformers VTD 25.01 complied with all the tests according to IEC 60044-2 and IEC 62271-304.
For the customer’s request we provide official calibration.
Tightening torques max.
Primary terminal M10
20 Nm
Ground terminal M8
10 Nm
Secondary terminal M5
2.7 Nm
This transformer is not designed as a self-locking one. To protect the appliance from destruction due to non-standard effects such as overvoltage, ferroresonance, transients etc., the transformer must be equipped with suitable transformer protection.
For more information about non-standard effects and protection please visit our website www.kpbintra.cz under “support” section.
Parameters
- Highest voltage for equipment: 24/25 kV
- Power frequency test voltage: 50 kV
- Lightning impulse test voltage: 125 kV
- Nominal primary voltage: 3000 – 22000 V
- Nominal secondary voltage: 100/3, 110/3, 120/3 V
- Accuracy class – measurement: 0.2, 0.5, 1, 3
- Accuracy class – protection: 3Р, 6Р
- Nominal power: 10 – 150 VA
- Max power: this information will be provided only at the customer's request
- Nominal frequency: 50 Hz
- Length creepage: 314 mm
- Weight: 35 kg
- Thermal insulation class: E
- Operation conditions: corresponds to temperature class -5/40 according to IEC 61869-1
- Standard: ČSN EN 60044-2, IEC EN 60044-2, ČSN EN 61869-1, ČSN EN 61869-3, IEC EN 61869-1, IEC EN 61869-3, GOST 15 150
Attached files
Drawing
