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CURRENT MEASURING TRANSFORMERS, UP TO
0,72 kV, MEASURING CLASS 0,5 OR HIGHER

 

  •   Transformers with bus bar in case ST - 1 from 10 up to 1500 A

  •    Transformers with hole in case NST - 1 from 200 up to 300 A

  •    Transformers with hole in case NST - 2 from 400 up to 1500 A

  •    Transformers with hole in case NST - 5 from 1000 up to 3000 A

 

 
Current measuring transformers for secondary current 5 A (1A)  TYPE: ST - 1
 
Current measuring transformers for secondary current 5 A (1A)  TYPE: NST
 
Current measuring transformers for secondary current 5 A (1A)  TYPE NST - 5

MEASURING CURRENT TRANSFORMERS

TRANSFORMER DESIGN:

  • ST is measuring current transformer with primary and secondary windings, which are insulated from each other by high quality insulation material.
  • NST are through-type measuring current transformers. The magnetic core is toroidal and made from high-quality cold rolled sheet steel which is thermally treated and than given a protective coat.
  • The magnetic core and secondary winding are accommodate in a melamine insulating casing which helps to reduce the flashover clearances.
  • The design of current transformer is such that it can easily be mounted on primary bars. Also, the transformer can be mounted on standard steel section y means of additional supports. ST are normally manufactured with a base which can be easily removed so their mounting on any place.

TECHNICAL DATA:

nominal voltage
testing voltage 50 Hz / 1 min
nominal frequency
nominal secondary current
nominal termic current
continual termic current
security factor
valid orders

0,720 kV
3 kV
50 / 60 Hz
5 A (1A)
Ith = 60 In
Itth = 1,2 In
Fs = 5 (10)
IEC 185

MAIN FEATURES:
  • high accuracy class
  • mechanical durability to shocks
  • can be mounted in any position
  • posibility of plumbing the secondary connections
  • capable of withstanding the short-time thermal and dynamic stresses.

APPLICATION AND HANDLING:
    They are incorporated in the electrical switchgears for indoor installation. They are used for the connection of ammeters and current circuits of meters, protective and other measuring devices.
   The transformer should never be left in operation with the secondary connection open as the hazardous voltage and serious damaging of transformer insulation can occur.

TESTING:
   Type tests are performed according to IEC, Croatian Ministry for measuring and standards, Croatian register of shipping and Bureau Veritas.

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NOTE:
   By connecting the burden with lower power from the core power it is received the higher security factor, and it is necessary to make protection the meter instrument from the reason higher secondary current.
   For accuracy limit factor, it is the same dependence.

TIP:
ST - 1
A:
10-300
400
500-600
750-1200
VA:
5
10
5
10
10
15
10
15
kl.
0,5
1
0,5
1
0,5
1
0,5
1

TIP:
NST - 1, FS 10
A:
200
250
300
VA:
5
5
10
5
10
kl.
1
0,5
1
0,5
1

TIP:
NST - 2, FS 5 - FS 10
A:
400
500
600
800
1000
1200,1500
VA:
5
10
10
15
10
15
10
15
10
15
10
15
kl.
0,5
1
0,5
1
0,5
1
0,5
1
0,5
1
0,5
1

We retain the right of changing the data.