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We measure high voltage for you

using instrument transformers for both outdoor and indoor applications, special transformers, sensors and power transformers

 

Insulation voltage 1.2 to 17.5 kV Test voltage 6 to 38 kV Test impulse voltage 20 to 95 kV Nominal primary voltage 1000/√3 – 15000/√3 V Nominal secondary voltage 100/√3, 110/√3, 120/√3 V Nominal auxiliary voltage 100/3, 110/3, 120/3 V Nominal frequency 50 Hz Power 30, 50, 75, 100, 150 VА Accuracy class 0.2, 0.5, 1, 3Р, 6Р Extreme power 500 VА Creepage distance 650 mm Weight 24 kg Approval   drawing [ZIP, 139kB] in DWG format

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Voltage instrument transformers VTO 15 are single-phase transformers. They are designed for the use in the high voltage systems. They are designed for measuring and protection of high voltage distributing equipment for outdoor design. They are suitable for supplying of drives of remote-controlled section switches.

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

Magnetic circuit of voltage transformers VTO 15 is made of oriented transformer strips in the shape of “C” of core. The outlets of primary winding are brought out by the means of bolts M10. For contacting them we recommend use conductors of maximum diameter of 6 mm2 and terminal ends by reason of suspensionof 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.

All active parts of transformers VTO 15 are compound-insulated with epoxy-mixture resistant to the external effects (UV radiation, humidity, etc.) 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 frame. 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 waterproof cover. The cover can be sealed. 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 supply transformers VTO 38 with modified basic plates that have identical mounting spacing to spacing of the substituted types.

Voltage instrument transformers VTO 15 complied all the tests according to the ČSN EN 600442, GOST 1516.3-96 up to the altitude up to 2000m and climatic conditions “T1 and UCHL1” by GOST 15 150 .

For the customer’s request we provide official calibration.

It is possible to consult other technical parameters with the producer.