Current transformer TZLU-250×450

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

10

Stability of characteristics, at least, years

50

Warranty period of operation, years

5

Guaranteed storage life, years

3

Notes.

1) The error is normalized in the current range from 1% of the rated current to the maximum primary current at rated load.

2) When the rated load is reduced, the transformer error decreases and the current range expands.

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.