Voltage instrument transformers VTX-x type

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Voltage instrument transformers VTX-x type

The instrument transformers type VTX-x, are designed for indoor, use in electric distribution panels, for measuring and protection.

They are designed to be resistant up to 17,5 kV insulation level, molded in epoxy resin under vacuum.

Product catalog and referance price list 17,5 kV

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Voltage transformers for measuring type VTX-x are support type transformers, dry, cast in epoxy resin, under vacuum, having the role of both electrical insulation and to ensure mechanical resistance. They are intended for indoor use, for measurement and protection, in medium voltage cells and substations, for insulation levels from 3.6 / 10/40 kV to 24/50/125 kV.

The value of the secondary nominal voltages is 100: √3 V, 110: √3 V, 100: 3 V, 110: 3 V, 100 V, 110 V. The accuracy classes of the measuring secondary can also be 0.2, 0.5, 1, 3 , and for protective secondary are 3P and 6P. For measuring secondary, the required accuracy class is guaranteed in the range of 25% - 100% of the nominal load, and for protection secondary the accuracy class is guaranteed at 100% of the nominal load.

The working limit voltage of these transformers is 120% of the nominal voltage for continuous operation, and for the determined operation for 8 hours, the monopoly transformers can operate at 190% of the nominal voltage.

The number of secondary windings can be from 1 to 3, depending on the accuracy class and the power required.

The connections to the secondary windings are made inside a terminal box, provided with a sealable transparent cover and supports for cable glands, type PG16.

Transformers can be mounted in any position. Fixing the transformers is done with the help of four screws in the holes provided in their motherboard.

The transformers are delivered with all the screws and accessories necessary for the connection in the circuit

The connection to the ground will be made with an M8 screw, provided on the metal fixing sole.

Transformers are designed, made and tested according to standards IEC 61869-1, IEC 61869-3.

The shape and dimensions of the transformers are in accordance with DIN 42600-9

Metrological verification bulletins can be issued upon request.

For parameters that are not specified in this documentation, we expect you to contact us by e-mail or telephone.

Highest voltage for equipment: 3.6; 7.2; 12 kV

Test with applied voltage 50 Hz - 1 min; 10; 20; 28 kV

Lightning pulse test - 1.2 / 50 µs: 40; 60; 75 kV

Primary rated voltage for monopolar transformers - A: 3: √3 ÷ 10: √3 kV

Primary rated voltage for bipolar transformers - One: 3 ÷ 10 kV

Secondary rated voltage - Us: 100: √3; 100: 3; 100; 110: √3; 110: 3; 110 V

Frequency: 50 Hz

Secondary winding power: 1 ÷ 200 VA

Accuracy class secondary winding measurement: 0.2; 0.5; 1; 3 %

Accuracy class secondary winding protection: 3P; 6P

Insulation class: E

Altitude: maximum 1000 m.

Ambient working temperature: - 5… + 40 ° C.

Storage transport temperature: - 25… + 40 ° C.

Standards: IEC 61869-1: IEC 61869-3; DIN 42600-9

Instructions for connecting voltage transformers to the circuit for measurement,

type VTX-1

Measuring voltage transformers, single-pole insulated (monopolar) type VTX-1, used in three-phase measuring systems, are supplied with a primary winding marked A-N, and with one to three secondary windings. Secondary windings can be made in any combination, measurement or protection. The secondary windings used for measurement are marked with a-n, and the protective ones are marked with da-dn.

The installation in three-phase system is done with the primary and secondary measuring windings connected in star, and the secondary protection windings connected in open triangle.

Making connections:

- The “N” terminal of the primary winding must be connected to earth

- Terminal “N” of the primary winding must be connected to ground - Terminals “n” of the secondary measuring windings - will be connected to grounding

- One of the terminals of the secondary protection windings “dn” - will be connected to earth

Attention!

DO NOT connect to ground more than one “dn” terminal in the case of open triangle-connected protective windings, as there is a danger of damage to the instruments.

Instructions for connecting voltage transformers to the circuit for measurement,

type VTX-2

Voltage measuring transformers, with two insulated (bipolar) poles type VTX-2, used in three-phase measuring systems, are supplied with a primary winding marked A-B, and with one to three secondary windings. Secondary windings can be made in any combination, measurement or protection. The secondary windings used are marked with 1a-1b, 2a-2b,….

When using two bipolar transformers, the installation in the three-phase system is done with the primary and secondary measuring windings connected in an open triangle.

For mounting three bipolar transformers in the three-phase system, the primary and secondary measuring windings must be connected in a closed triangle.

Making connections:

- One of the terminals of the secondary windings “b” They will be connected to earth

Attention!

When using two bipolar isolated transformers connected to the “V” type connection (open triangle), it is mandatory that a terminal at one of the secondary windings of the two transformers be connected to earth. This is required to avoid a short circuit between the two transformers.

Permissible force limit for

tightening the screws:

 

M 4 = 0,8 …1,2 Nm

M 5 = 2,8 … 3,5 Nm

M 8  =  16 … 20 Nm

M 10 = 20 … 25 Nm

Instructions for handling, transport, storage and commissioning

of current transformers for measurement, type VTX-x

 

Manipulation:

Type transformers VTX-x they are heavy objects in relation to their volume. Therefore, the handling and transport of such products will be done with care, so as not to cause injuries to the body of the maneuverer of any kind. The rules of labor protection regarding the handling of heavy objects will be strictly observed. Direct contact with the ground of the transformers will be avoided, especially in conditions of high humidity.

 

Transport:

Transportation of type transformers VTX-x it will be done in normal atmospheric conditions, avoiding contact with atmospheric precipitation and following the special specifications ("avoid rain", "attention to fragile object", "no overlaying", etc.) marked by a label on transformer package, where applicable.

 

Storage conditions:

Storage of type transformers VTX-x it will be done in closed spaces with environments free of humidity, highly corrosive substances, chemically active substances, flammable or explosive vapors and without electrically conductive dusts.

 

Putting into service:

At the time of commissioning of the type transformers VTX-x, their location in a space that respects the ambient temperature level will be considered in order to be included in the insulation class in which they were made, elements that are specified on the product label.

When commissioning, the corresponding circuit connection must be observed, in accordance with the markings on the transformer terminals and the connection instructions for these types of transformers. Only multi-wire (corded) cables or connecting rods, the section of which corresponds to the rated current specified on the product label, electric slippers of appropriate dimensions, with the insulation distance on the surface between the slippers, etc., shall be used.

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