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V.F Tranformers (2T/3T) are used for terminating and derivation of the circuits in the underground telecom cables with various Impedance Ratio such as 1120:1120 , 470:1120 , 1120:600 , 470:470 & 470:600. Two/three such transformers are sealed at a time in a cylindrical brass enclouser.
| Sl. No. | Name | Type 1 | Type 2 | Type 3 | Type 4 | Type 5 |
|---|---|---|---|---|---|---|
| 1 | Characteristics | Terminating & Tapping Transformer For V.F. Circuits |
Terminating & Tapping Transformer For Polythene Insulated V.F. Quad |
Transformer For Inter Wire |
Transformer For Polythene Insulated V.F. Quad |
Transformer For Inter Wire |
| 2 | Impedance Ratio | 1120:1120±2% | 470:1120± 2% | 1120:600± 2% | 470:470± 2% | 470:600± 2% |
| 3 | Insulation Resistance with 500V Winding-Winding-Case | 10,000 MΩ | 10,000 MΩ | 10,000 MΩ | 10,000 MΩ | 10,000 MΩ |
| 4 | Dielectric Strength Winding-Winding-Case | 2KV(rms) FOR 1 min. | 2KV(rms) FOR 1 min. | 2KV(rms) FOR 1 min. | 2KV(rms) FOR 1 min. | 2KV(rms) FOR 1 min. |
| 5 | Return Loss | More than 20dB | More than 20dB | More than 20dB | More than 20dB | More than 20dB |
| 6 | Insertion Loss | Not more than 0.6dB | Not more than 0.6dB | Not more than 0.6dB | Not more than 0.6dB | Not more than 0.6dB |
| 7 | Bridging Loss with secondary open | Not more than 0.015dB | Not more than 0.015dB | Not more than 0.015dB | Not more than 0.015dB | Not more than 0.015dB |
| 8 | Attenuation Distortion | Within±0.1dB | Within±0.1dB | Within±0.1dB | Within±0.1dB | Within±0.1dB |
| 9 | Winding Balance | More than 60dB | More than 60dB | More than 60dB | More than 60dB | More than 60dB |
| 10 | Open Circuit Drain | --- | --- | 600Ω side open 1120Ω side 20V<=2mA 50V<=7mA | --- | 600Ω side open 1120Ω side 20V<=2mA 50V<=7mA |