Current Transformer Accuracy Class

Current Transformer Accuracy Class Description Current Transformer Accuracy Class Current transformer class level from 0.5-330kV is used for metering and relay protection, 50 or 60Hz system. 33kv 35kv 110kv 115kv 132kv 138kv 220kv Current Transformer accuracy Class has 0.1: 0.2: 0.5: 0.2S: 0.5S:...

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Current Transformer Accuracy Class

Description

Current Transformer Accuracy Class

Current transformer class level from 0.5-330kV is used for metering and relay protection, 50 or 60Hz system. 33kv 35kv 110kv 115kv 132kv 138kv 220kv  Current Transformer accuracy Class has 0.1: 0.2: 0.5: 0.2S: 0.5S: 5P: 10P: TPS: PX…Class of 0.2S & 0.5S is for special purpose. Accuracy class  of 0.2 and 0.2S is use for measurement current transformer. When at low burden the precision of class 0.2S is over the 0.2’. P means the class of protection CTs.

Types of current transformer

Oil Impregnated Paper Hair-pin Type Current Transformer

Oil Immersed Top-head Type Current Transformer

SF6 Gas Insulation Current Transformer

Compound Film Insulation Current Transformer

Outdoor Epoxy resin cast Current Transformer

Indoor Epoxy resin cast Current Transformer

Epoxy resin cast Electronic Current Transformer

 Rated frequency 

Hz 

50 : 60

 Rated voltage

kV 

35

66/69

110

132/138

150

220

 Highest voltage for equipment

kV 

40.5

72.5

126

145

170

245

 Power frequency withstand voltage on primary windings

kV 

95

160

230

275

325

460

 Rated lightning impulse withstand voltage

kV 

185

350

550

650

750

1050

Flashover distance 

mm

500

700

1200

1200

1500

2200

 Creepage distance

mm

 1260

1020

1820

2250

3150

3910

3630

4500

4250

5270

6300

7820

 Mechanical load

N

3000

3000

3000

3000

3000

4000

 Rated primary current

A

 50~5000

100~5000

 Rated secondary current

A

 1 : 5

 Accuracy class 

 

0.1:0.2:0.5:0.2S:0.5S:5P:10P:TPS:PX...

 Rated output (Recommended value)

VA

1A: 10~15VA    5A: 30~50VA

 Instrument security factor

FS

5 :10

 Accuracy limit factor

ALF

10. 15. 20. 25. 30

 Short-time thermal current
     ( Maximum)

kA

63kV/3s (In series)

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