RESIN CAST CURRENT TRANSFORMER
Indotech Resin Cast Current Transformer (CT) – Cast-resin power transformers encase the windings in epoxy resin. These transformers simplify installation since they are dry, without cooling oil, and so require no fire-proof vault for indoor installations. The epoxy protects the windings from dust and corrosive atmospheres. However, because the molds for casting the coils are only available in fixed sizes, the design of the transformers is less flexible, which may make them more costly if customized features (voltage, turns ratio, taps) are required. Resin cast current transformers are available for metering and protection application. These current Transformers are mainly fabricated according to client’s specification. CT coils are encapsulated in cast resin (Polyester / Epoxy). Secondary terminals are provided with either screws or studs. The main insulation between Primary and Secondary and Earth is obtained by this epoxy resin. These transformers are of compact design with high mechanical and electrical properties. These are non- hygroscopic and hence give very good insulation properties even in given humid conditions.
TYPE OF TRANSFORMER: RESIN CAST
PRINCIPAL OF OPERATION
The standards define a voltage transformer as one in which “the secondary voltage is substantially proportional to the primary voltage and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections.”
This, in essence, means that the voltage transformer has to be as close as possible to the “ideal” transformer. In an “ideal” transformer, the secondary voltage vector is exactly opposite and equal to the primary voltage vector, when multiplied by the turns ratio
| SECONDARY : 1A SECONDARY : 5A | ||||||
| CT RATIO | PRODUCT CODE | CT RATIO | PRODUCT CODE | ID | RATED BURDEN VA | ACCURACY CLASS |
| 30/1A | GR0030503B | 30/5A | GR0030503C | 30 | 3 | 5 |
| 40/1A | GR0040503B | 40/5A | GR0040503C | 30 | 3 | 5 |
| 50/1A | GR0050503B | 50/5A | GR0050503C | 30 | 3 | 5 |
| 60/1A | GR0060503B | 60/5A | GR0060503C | 30 | 3 | 5 |
| 75/1A | GR0075503B | 75/5A | GR0075503C | 30 | 3 | 5 |
| 100/1A | GR0100503B | 100/5A | GR0100503C | 30 | 3 | 5 |
| 100/1A | GR0100205B | 100/5A | GR0100205C | 35 | 5 | 2 |
| 100/1A | GR0100105B | 100/5A | GR0100105C | 35 | 5 | 1 |
| 150/1A | GR0150503B | 150/5A | GR0150503C | 30 | 3 | 5 |
| 150/1A | GR0150205B | 150/5A | GR0150205C | 35 | 5 | 2 |
| 150/1A | GR0150105B | 150/5A | GR0150105C | 50 | 5 | 1 |
| 200/1A | GR0200505B | 200/5A | GR0200505C | 30 | 5 | 5 |
| 200/1A | GR0200205B | 200/5A | GR0200205C | 35 | 5 | 2 |
| 200/1A | GR0200105B | 200/5A | GR0200105C | 50 | 10 | 1 |
| 250/1A | GR0250110B | 250/5A | GR0250110C | 50 | 5 | 1 |
| 300/1A | GR0300110B | 300/5A | GR0300110C | 50 | 10 | 1 |
| 400/1A | GR0400115B | 400/5A | GR0400115C | 60 | 15 | 1 |
| 500/1A | GR0500115B | 500/5A | GR0500115C | 60 | 15 | 1 |
| 600/1A | GR0600115B | 600/5A | GR0600115C | 60 | 15 | 1 |
| 800/1A | GR0800115B | 800/5A | GR0800115C | 105 | 15 | 1 |
| 1000/1A | GR1000115B | 1000/5A | GR1000115C | 105 | 15 | 1 |
| 1200/1A | GR1200115B | 1200/5A | GR1200115C | 105 | 15 | 1 |
| 1600/1A | GR1600115B | 1600/5A | GR1600115C | 115 | 15 | 1 |
| 2000/1A | GR2000115B | 2000/5A | GR2000115C | 115 | 15 | 1 |
| 2500/1A | GR2500115B | 2500/5A | GR2500115C | 130 | 15 | 1 |
| 3200/1A | GR3200115B | 3200/5A | GR3200115C | 130 | 15 | 1 |
