Current instrument supporting transformer CTS 38.41W

Supporting current instrument transformers CTS 38.41W are designed for the measurement and protection of the distributing facilities of high voltage for inner settings for primary current 5 – 2500 A and highest voltage for equipment 38.5 kV (40.5 kV for GOST).

The value of the secondary current is 5 A or 1 A with the possibility of combination.

Supporting current instrument transformers CTS 38.41W are designed for the measurement and protection of the distributing facilities of high voltage for inner settings for primary current 5 – 2500 A and highest voltage for equipment 38.5 kV (40.5 kV for GOST).

The value of the secondary current is 5 A or 1 A with the possibility of combination.

The classes of accuracy for the circuits of measurement are 0.2, 0.5, 0.2S, 0.5S, 1, 3, for the circuit of protection are 5P, 10P and PX. The transformers comply with the required class of accuracy within the values from 25% to 100% of rated load.

The limiting working current is 120% of IN, according to the agreement of producer and customer it is possible to supply other values, for example 200% of IN.

The secondary winding is wound on a magnetic core made from grain oriented sheets, or alloys of nickel, iron and copper (permalloy). 

The number of cores can be from 1 to 4 according to the request of customer and according to the required parameters.

Transformers CTS 38.41W are constructed as transformers with single-turn or multi-turn primary winding. The up-to-date construction of these transformers allows the switching not only on the secondary side but also on the primary one. The primary switching can be easily mounted by the means of connection of two jumpers to the circuit by the means of two screws M8 (See “The Instructions for the mounting and operation”. Screws and jumpers are the part of the transformer.)

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

The mounting position of transformers is arbitrary. Transformers are fixed by the means of four screws in the holes in the basic plate. The primary terminals of transformers are equipped with screws M12. 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 equipped 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.  The number of the terminals allows to connect up to 4 secondary cores or 4 cores with switching on the secondary side.  

CTS 38.41 W would be equipped with a capacitive divider to detect the voltage, at the request of the customer. To connect the capacitive divider a special terminal 'Ck' is used.

Transformers CTS 38.41W complied with all the tests according to IEC 61869-1, IEC 61869-2.

For the customer’s request we provide official calibration.

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

Highest voltage for equipment: 36/38.5 kV
Power frequency test voltage: 70/80 kV
Lightning impulse test voltage: 170/180 kV
Nominal primary current: 5-2000 A
Nominal secondary current: 5 A or 1 A
Rated short-time thermal current, Ith: max 80 kA/1s (31.5 kA/3s)
Rated dynamic current, Idyn: max 200 kA
Rated continuous thermal current, Icth: 120 % In
Accuracy class - measurement: 0.2S, 0.2, 0.5S, 0.5, 1, 3
Overcurrent factor - measurement: FS 5, FS 10
Accuracy class - protection: 5P, 10P, PX
Overcurrent factor - protection: 5, 10, 15, 20, 25, 30
Nominal power: 5-60 VA
Nominal frequency: 50 Hz
Weight: 45 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: IEC 61869-1, IEC 61869-2