The Current Transformers are tailor-made, to suit to individual customer’s requirement. C.R.G.O. Cores are procured to the required sizes. Over the toroidal cores, two layers each of cotton tape and empire tape is wound as basic insulation.
After basic insulation, required number of secondary turns using super enamelled copper wire is wound on the toroidal coil winding machine. The different secondary cores of the transformer are wound separately. The number of cores per transformers will be as per requirement of the customer. After winding all cores individually, these cores are stacked together and all secondary leads are bunched together, brought out through a chimney which is fixed to the cores.
The secondary coil is now ready for H.T. Insulation. The insulation is carried out using kraftpaper; thickness of insulation depends on the rating of the transformer.
After H.T. Insulation, the core is wound with required number of primary conductors using double cotton covered copper / aluminium wire. After primary windings, the end of the conductors is crimped with suitable lugs for termination.
The core now housed inside the top tank of the tank assembly, which consists of bottom tank, porcelain bushing and top tank. The secondary leads are passed through the porcelain to be terminated at the bottom tank.
The entire assembly is no subjected to vacuum and filled with oil after which final assembly is completed. The transformers are now subjected to all routine tests as per I.S. and can then be offered for inspection and despatch.
A current transformer is a device that is used for the transformation of current from a higher value into a proportionate current to a lower value.
| Brief performance data of Current Transformer | |
|---|---|
| Installation | Outdoor |
| Design | Inductive Type |
| Construction | Live |
| Insulation | Oil-paper |
| Highest Voltage for equipment | 11 – 245 kV |
| Short time current (STC) | Up to 50 kA -1 sec |
| Insulators | Porcelain/Polymer |
| Creepage distance | ≥ 25 mm/kV Longer on request |
| Ambient Temperature | -5° C to +50°C , as per customer requirement |
| Design Altitude | Max. 1000m , as per customer requirement |
| Accuracy | Meets all IEC & IS metering &Protection classes |
ORGANIZATION
CERTIFIED TO
ISO 9001:2015
