WOUND PRIMARY CURRENT TRANSFORMER
Indotech Wound Type Current Transformers (CT) – In transformer the primary winding is composed inside the transformer. The primary winding had a single turn and connected in series with the conductor that measured the current.
- Capacity: There are designed to measure currents from 1 amp to 100 amps.
- the most common one is the wound type current transformer. The wound type provides excellent performance under a wide operating range. Typically, the wound type is insulated to only 600 volts.
- Since the load current passes through primary winding in the CT, screw terminals are provided for the load and secondary conductors. Wound Type Current Transformer are available in ratios from 2.5:5 to 100:5.
- Wound Type Current Transformer have a primary and secondary winding like a normal transformer. These CTs are rare and are usually used at very low ratios and currents, typically in CT secondary circuits to compensate for low currents, to match different CT ratios in summing applications, or to isolate different CT circuits. Wound Type Current Transformers have very high burdens, and special attention to the source CT burden should be applied when wound CTs are used.
led as a primary conductor.
TYPE OF TRANSFORMER : WOUND PRIMARY
When the ratio is low it becomes difficult to obtain good results with the single primary turn. For that purpose wound primary CT’s are used where both primary and secondary turns are wound on the torroidal core. The ranges available are from 5/5A to 100/5A. Also Secondary 1A can be provided. Optional mounting arrangements are provided as the CT is mounted between two Bakelite plates and brass terminals are provided for connections of primary & secondary.
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
| “INDOTECH” WOUND PRIMARY CURRENT TRANSFORMER’S | |||||||
| WOUND PRIMARY LOW TENSION TAPE WOUND CT’S | WOUND PRIMARY LOW TENSION TAPE WOUND CT’S | ||||||
| RATED BURDEN : 15VA | CLASS 1.0 | SECONDARY : 1A | RATED BURDEN : 15VA | CLASS 1.0 | SECONDARY : 5A | ||
| CT RATIO | CODE WITHOUT MOUNTING | CODE WITH MOUNTING | CODE WITH RESIN CAST | CT RATIO | CODE WITHOUT MOUNTING | CODE WITH MOUNTING | CODE WITH RESIN CAST |
| 5/1A | GW W005115B | GW M005115B | GW S005115B | 5/5A | GW W005115C | GW M005115C | GW S005115C |
| 10/1A | GW W010115B | GW M010115B | GW S010115B | 10/5A | GW W010115C | GW M010115C | GW S010115C |
| 15/1A | GW W015115B | GW M015115B | GW S015115B | 15/5A | GW W015115C | GW M015115C | GW S015115C |
| 20/1A | GW W020115B | GW M020115B | GW S020115B | 20/5A | GW W020115C | GW M020115C | GW S020115C |
| 30/1A | GW W030115B | GW M030115B | GW S030115B | 30/5A | GW W030115C | GW M030115C | GW S030115C |
| 40/1A | GW W040115B | GW M040115B | GW S040115B | 40/5A | GW W040115C | GW M040115C | GW S040115C |
| 50/1A | GW W050115B | GW M050115B | GW S050115B | 50/5A | GW W050115C | GW M050115C | GW S050115C |
| 60/1A | GW W060115B | GW M060115B | GW S060115B | 60/5A | GW W060115C | GW M060115C | GW S060115C |
| 75/1A | GW W075115B | GW M075115B | GW S075115B | 75/5A | GW W075115C | GW M075115C | GW S075115C |
| 100/1A | GW W100115B | GW M100115B | GW S100115B | 100/5A | GW W100115C | GW M100115C | GW S100115C |
