Current transformer TZLU-70-1 / Zero-sequence current transformers / ELEMARK . Dnipro City

UkraineDnipro City

Technical specifications

Parameter name	Value
Rated voltage, kV	0,66
Note. When installing a cable with a rated operating voltage of 10 kV (maximum 12 kV), the main insulation between the current-carrying conductors of the cable and the secondary winding of the transformer is provided by the cable insulation, while the metal sheath and cable armor must be grounded.
Rated frequency, Hz	50
Number of secondary windings	1
Transformation ratio	30/1	60/1
Rated primary current, A	30	60
Maximum primary current, A	60	250
Rated current strength of the secondary winding, A	1	1
Rated load of the secondary winding at cos φ = 1, Ohm	1	1
Limit of error of the secondary winding at rated load: - current, %, not more than; - angular, o, not more than	f = 1,5 % δ = 3	f = 1 % δ = 1
Sensitivity: on S1-S2 at rated load and primary current of 0.25 A, not less than, mV	8	4
1 sec thermal resistance current of the secondary winding, A	150
Test one-minute insulation voltage, kV	3
Weight, kg	2,1
Stability of characteristics, at least, years	50
Warranty period, years	5
Guaranteed storage life, years	3
Note.1. The error is normalized in the range of currents from 1% of the rated current to the maximum primary current at rated load.2. With a decrease in the rated load, the transformer error decreases and the current range expands with it.3. The primary current sensitivity of the protection is determined by the expression: (primary current, A) = (installation current, A) * (transformation ratio), taking into account the transformer error and the error of the relay used.

At the customer's request, transformers can be manufactured with a different transformation ratio. The winding of the transformers is made on a nanocrystalline alloy core. This ensures a large linear dynamic range of winding characteristics in terms of current and angle. This ensures long-term stability of the characteristics throughout the entire service life of the transformer and the resistance of the magnetic circuit to magnetization (from unipolar pulse short-circuit currents of a three-phase cable). In addition, a safety factor of no more than three is provided, which significantly reduces emergency overloads of measuring devices connected to the secondary winding. The use of these transformers reduces operating costs for consumers.

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