Medium-voltage instrument transformers
Voltage instrument power transformer
VPPT 38.2
Voltage transformers VPPT 38.2 are single-phase double-pole insulated transformers designed for outdoor usage in high-voltage networks from 1 kV to 38.5 kV. They are designed to supply automation and distribution devices and drives of remotely-controlled section switches.
The magnetic circuit of VPPT 38.3 voltage transformers is made of oriented transformer strips in the shape of the „C” core.
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Description
Voltage transformers VPPT 38.2 are single-phase double-pole insulated transformers designed for outdoor usage in high-voltage networks from 1 kV to 38.5 kV. They are designed to supply automation and distribution devices and drives of remotely-controlled section switches.
The magnetic circuit of VPPT 38.3 voltage transformers is made of oriented transformer strips in the shape of the „C” core.
All active parts of the transformer are embedded in an epoxy compound that withstands external influences (UV radiation, humidity, etc.). This material fulfils not only an electro-insulating function, but also a mechanical function. The length of the surface path is 1240mm.
The transformers are attached using four M12 screws through the holes in the basic frame. Primary winding „A” and „B” endings are brought out using M10 bolts. It is recommended to use conductors maximally 6 mm2 in cross-section and cable eyes to spring dynamic forces and vibrations in the network.
Cable eyes can be used to connect secondary endings (for 10 mm2 conductor they are included). The secondary terminal board has a watertight cover (IP 65). The cover can be sealed.
There is an additional pack inside which contains jumpers and screws to earth the coil (see the “Installation and operating instructions”).
ATTENTION! We do not recommend operation of idling transformers due to possible instability and oscillation. Min. load is the 100-200W.
The devices fulfil the chosen condition from the following standards: IEC 600 76-1 to 600 76-11, IEC 600 44-2 and GOST.
Other technical parameters can be consulted with the producer.
Parameters
- Highest voltage for equipment: 36/38.5 kV
- Power frequency test voltage: 70/80 kV
- Impulse test voltage: 170/180 kV
- Nominal primary voltage: 3 000–35 000 V
- Nominal secondary voltage: 100, 110, 120, 230 V
- Accuracy class – measurement: 6 %
- Max power: 2 000 VA, pro 35 kV max. 1,5 kVA
- Nominal frequency: 50 Hz
- Weight: 90 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
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