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  4. Voltage range 17.5-24 kV
  5. Current transformer TOLU-24

Current transformer TOLU-24

The current transformer TOLU-24 is installed in the switchgear to provide measurements of the power grid, automation and control. To this end, the signal received at the input is converted to parameters that can be used by the relevant devices (measuring, etc.). These devices should be purchased to work with alternating current with a frequency of 50 Hz to 24 kV.


Transformers can operate in any position. They are manufactured in accordance with GOST 15150-69, being part of category 2.1, climatic execution "U". The products are guaranteed to retain their original metrological characteristics during operation for 50 years. This is ensured by the use of nanocrystalline material in the manufacture of the core. As a result, it remains insensitive to magnetization and retains its performance for a long time.

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Type examination certificate (Module B) No. UA.TR.001 150-19 Rev.2 reference number 29/3/B/12/016 20. Complies with DSTU EN 61869-2:2017.

Technical specifications

Parameter nameValue
Maximum operating voltage, kV24
Rated primary current, A5, 10, 15, 20, 30, 40, 50, 75, 100, 150, 200, 300, 400, 500, 600, 800, 1000, 1500, 2000, 2500, 3000
Rated secondary current, A1;5
Rated frequency, Hz50
Number of secondary windings2, 3
Accuracy class of the secondary winding: - for measurement; - for protection;0,2S; 0,5; 0,5S;0,5S+ / 5P;10P
Rated secondary load at cos φ = 0.8, VxA winding: - for measurements; - for protection;10 / 15
Rated primary current, A51015203040507510015020030040050060080010001500200025003000
Rated short-term thermal resistance current, Ith, kA0,61,31,32,63,33,33,77,77,414,414,428,828,836368686108108108108
Rated current strength of dynamic stability Idyn, kA1,63,33,36,58,38,39,318,518,5363672729090215215270270270270
Safety factor of the device, FS, not more than333333333333334555555
Ultimate accuracy factor, ALF, not less than **7777788787878899910131313


It is possible to supply a cover to protect the secondary winding terminals from unauthorized access (sealing) as part of the transformer package - if specified in the supply contract.

* Transformers with rated secondary load up to 30 V-A can be supplied (please specify when ordering).

** Transformers with a nominal maximum multiplicity of at least 10 can be supplied (specify when ordering).

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