Voltage instrument supporting transformer

VTS 25

Voltage instrument transformers VTS 25 are single-phase transformers isolated with one pole.

They are designed for the use in the high voltage systems. They are designed for measuring and protection of high voltage distributing equipment for indoor design.

The instruments can be equipped with high voltage fuse protecting the surrounding distributing system.

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Description

Voltage instrument transformers VTS 25 are single-phase transformers isolated with one pole. They are designed for the use in the high voltage systems. They are designed for measuring and protection of high voltage distributing equipment for indoor design. The instruments can be equipped with high voltage fuse protecting the surrounding distributing system.

The values of secondary voltage are 100/√3, 110/√3, 120/√3, 100/3, 110/3, 120/3 V. The accuracy classes for measuring winding are 0.2, 0.5, 1, 3, for the securing winding are 3P and 6P. The transformers satisfy required accuracy class at intervals from 25% to 100% of rated load.

Transformers VTS 25 with fuse are provided with epoxy extender, holder and fuse enclosure of type SIBA (0.3 A or 0.6 A). Extender with fuse can be dismounted.

Magnetic circuit of voltage transformers VTS 25 is made of oriented transformer strips in the shape of “C” of core.

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 M12 in the holes in the basic plate. The outlet of primary winding “A” is brought out by the means of bolt M10.

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 plate is provided with the cover with sealing screw. Inside, there is the set with jumpers and small screws for the possibility of earth connection and short circuiting of the wiring. (See“The Instructions for the mounting and operation”).

In cases where the substitution for the older types of transformers (various producers) is required, we supplytransformers VTS 25 with modified basic plates that have identical mounting spacing to spacing of the substituted types.

Voltage instrument transformers VTS 25 complied with all the tests according to ČSN EN 60044-2.

For the customer’s request we provide official calibration.

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: 24/25 kV
Power frequency test voltage: 50 kV
Lightning impulse test voltage: 125 kV
Nominal primary voltage: 3000/√3 – 22000/√3 V
Nominal secondary voltage: 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, 3
Accuracy class – protection: 3Р, 6Р
Nominal power: 5 – 150 VA
Max power: this information will be provided only at the customer's request
Nominal frequency: 50 Hz
Weight: 29 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