Voltage instrument supporting transformer VTS 25P

Instrument voltage transformers VTS 25P.1 and VTS 25P.2 are single-phase single-pole insulated transformers designed for usage in high-voltage networks from 1 kV to 25 kV. They are designed for the measuring and protection of distribution devices of internal construction. The devices are equipped with an HV fuse to protect the surrounding distribution system.

Instrument voltage transformers VTS 25P.1 and VTS 25P.2 are single-phase single-pole insulated transformers designed for usage in high-voltage networks from 1 kV to 25 kV. They are designed for the measuring and protection of distribution devices of internal construction. The devices are equipped with an HV fuse to protect the surrounding distribution system.

Values of the secondary voltages are 100/√3, 110/√3, 120/√3, 100/3, 110/3, 120/3 V. Accuracy classes of the measuring coils are 0.2, 0.5, 1, 3 and accuracy classes of the protective coils are 3P and 6P. The transformers fulfil the required accuracy class within the range of 25 % to 100 % of the rated burden.

The body of VTS 25P transformers contains an epoxy adapter with SIBA fuse (0.3 A or 0.6 A) or VPO T32 or T50 (32 or 50mA). The fuse can be removed or inserted using a screw-able epoxy tube (see the Installation instructions). The HV contact can be floppy for installation in a distributing board (version VTS 25P.1) or fixed using an M6 screw (VTS 25P.2), see the drawing. (It is necessary to accurately specify the version in the order.) If the fixed contact is used, a cable eye is recommended according to the cross section of the used conductor.

The magnetic circuit of the voltage transformers is made of oriented transformer strips in the shape of the “C” core.

All active parts of transformer are compound-insulated with epoxy-mixture. This material performs both the electrical insulating and the mechanical functions.

The secondary terminal board is equipped with a cover and a sealing screw. There is an additional pack inside which contains jumpers and screws to earth the coil . (See“The Instructions for the mounting and operation”).

In cases where the replacement of an older transformer (different producers) is required, we provide VTS 25P devices on modified base plates that have the same installation dimensions as the replaced type.

Instrument voltage transformers VTS 25P comply with all tests according to ČSN EN 60044-2.

We can provide official calibration if so required by the customer.

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.

Highest voltage for equipment:  25 kV
Power frequency test voltage:  50 kV
Lightning impulse test voltage:  125 kV
Nominal primary voltage:  3000/√3 – 22000/√3 V
Nominal secondary current:  100/√3, 110/√3, 120/√3 V
Nominal auxiliary voltage:  100/3, 110/3, 120/3 V
Accuracy class - measurement:  0.2, 0.5, 1
Accuracy class - protection:  3Р, 6Р
Nominal power:  10, 30, 50, 75, 100, 150 VА
Max power:  this information will be provided only at the customer's request
Nominal frequency:  50 Hz
Weight:  30 kg
Thermal insulation class:  E
Operation conditions: 

operating temperature from -5 to + 40 °C

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