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Current Transformers
⇒ Current Transformer
Current Transformers
A Current Transformer is the measuring device for metering and protection system. The primary current of the CT is transformed into the required secondary current of 5 A or 1 A.
Measuring CT's have different class of accuracy I.e. 0.1, 0.2S, 0.2, 0.5S, 0.5 and 1.0 and protection CT's have 5P10, 5P20 and 10P10. In the case of special protection CT's(PS class), the Knee Point Voltage(KV) of the CT is specified along with secondary resistance and magnetizing current.
The construction of the CT not only depends upon the ratio but also on the Short Time Current Rating. Burden and Class of Accuracy.
⇒ Constructional Features
The core is made from non - ageing CRGO silicon steel laminations and Insulation is done with high grade paper insulation for proper distribution of electrical stresses and better voltage with stand capability.
⇒ Testing :::: Routine Test
Each Instrument Transformer is subject to all routine test as per customer specification and relevant IS/ IEC.
⇒ Type Test
The Instrument Transformers are regularly tested for type test as per respective IS/ IEC from the Govt. recognized test houses like CPRI and ERDA.
⇒ Features
⇒ Specification
⇒ PSC 2010
Accuracy Class |
|||
Primary Current |
1 VA |
2.5 VA |
5 VA |
100 |
1 |
- |
- |
150 |
1 |
- |
- |
200 |
- |
1 |
- |
250 |
- |
1 |
1 |
300 |
- |
1 |
- |
400 |
- |
- |
1 |
500 |
- |
- |
1 |
⇒ PSC 3010
Accuracy Class |
|||
Primary Current |
1 VA |
2.5 VA |
5 VA |
60 |
3 |
- |
- |
75 |
3 |
- |
- |
80 |
3 |
- |
- |
100 |
1 |
- |
- |
125 |
1 |
- |
- |
150 |
1 |
3 |
- |
200 |
- |
1 |
- |
250 |
- |
1 |
- |
300 |
- |
1 |
3 |
400 |
- |
- |
1 |
500 |
- |
- |
1 |
600 |
- |
- |
1 |