Capacitive voltage transformers (72.5-550kV)
NTC capacitor voltage transformers, type CPA and CPB, are intended for connection between phase and earth in networks with insulated or earthed neutral point.
Some of the features of this type of transformers are:
2) The windings for ratio adjustment are easily accessible to allow the user to optimize the transformer accuracy.
3) The dielectric used in the capacitor divider consists of a combination of oil impregnated paper and polypropylene film, resulting in CPA and CPB being practically impervious to temperature variation.
4) From the design point, the CPA and CPB are identical, apart from the CPB having a larger iron core enabling it to withstand higher loads.
5) In our opinion, due to their ferroresonance and temperature stability properties, the CPA and CPB are probably the world’s best capacitive voltage transformers.
2) The windings for ratio adjustment are easily accessible to allow the user to optimize the transformer accuracy.
3) The dielectric used in the capacitor divider consists of a combination of oil impregnated paper and polypropylene film, resulting in CPA and CPB being practically impervious to temperature variation.
4) From the design point, the CPA and CPB are identical, apart from the CPB having a larger iron core enabling it to withstand higher loads.
5) In our opinion, due to their ferroresonance and temperature stability properties, the CPA and CPB are probably the world’s best capacitive voltage transformers.
| Description | I | II | III | IV |
|---|---|---|---|---|
| Highest system voltage(kV) | 72.5 | 145 | 245 | 420 |
| Rated voltage(kV) | 63,66/√3 | 63,66/√3 | 63,66/√3 | 63,66/√3 |
| Power frequency withstand voltage(kV) | 140 | 275 | 460 | 630 |
| Min coupling capacitor(PF) | Up to 23800 | Up to 12700 | Up to 11600 | Up to 7300 |
| Rated output burden per eachwinding(VA) | Up to 200 | Up to 200 | Up to 200 | Up to 200 |
| Secondary rated voltage(V) | 100/√3,110/√3 | 100/√3,110/√3 | 100/√3,110/√3 | 100/√3,110/√3 |
| Secondary winding number | Up to 3 | Up to 3 | Up to 3 | Up to 3 |
| Rated Frequency(Hz) | 50 | 50 | 50 | 50 |