Current Transformer
A Current Transformer is a device that generates an alternating current that is proportional to the AC in its primary and secondary.
| General Particulars | 11KV | 33 KV |
|---|---|---|
| Highest System Voltage( H.S.V.) | 12 KV ( r.m.s.) | 36 KV (r.m.s.) |
| Power frequency dry/ wet withstand voltage on primary winding for one minute | 28 KV ( r.m.s.) | 70 KV ( r.m.s.) |
| Lightning Impulse withstand voltage (1.2 x 50 μs ) | 75 KV ( r.m.s.) | 170 KV ( r.m.s.) |
| Specific Particulars | |
| Rated Transformation Ratio | As per customer requirement (in Amp.) |
| Rated Primary Current | Upto 2000 Amp. |
| Rated Secondary Current | 1 Amp. 5 Amp. 0.577 Amp. |
| Short Time Thermal Current (Ith) | As per customer requirement. In general CT is to be specified with STF of 100 for 1 Sec. or STC (lth) equal to the system fault level whichever is lower. KA ( r.m.s. ) |
| Ith duration | 0.5 to 3.0 Second |
| Short Time Dynamic Current | 2.5 X Ith KA (Peak) |
| Number of Cores | Upto 5 cores |
| Output Burden | Upto 60VA, 0.8 pf Lagging |
| Accuracy Class | For Metering : 0.2S, 0.2, 0.5S, 0.5, 1.0 & 3.00. For Protection: 5P, 10P, 15P & PS |
| IAF, ALF, Knee Point Voltage, Exciting Current & Resistance | As per customer requirement / Design Constraints |
| Type of construction | Dead / Bottom Tank or Live / Top Tank |