DatasheetDEL-A
Open-core ring current transformer for residual current devices
| Type | Open-core ring current transformer for residual current devices |
|---|---|
| Design | Open-core ring current transformer |
| Application | For detecting leakage currents to ground in connection with residual current devices of the RD series |
| Application range | Low-voltage lines |
| Connection | Low-voltage line; medium-voltage lines with cables insulated by the customer |
| Construction | Ring current transformer manufactured with measuring winding only |
| Working principle | Active line conductors pass through the toroid and create a magnetic field proportional to their own current |
| Residual current detection | In fault-free operation, the vector sum of the currents is zero; a leakage to ground creates an imbalance proportional to the leakage current |
| Signal transmission | The imbalance is detected by the toroid and sent to the residual current device |
| Transformer selection | According to the lowest residual current to be detected and the hole diameter through which all active conductors must pass |
| Relay connection | When using high-sensitivity residual current devices, attention must be paid to the distance between the ring current transformer and the relay |
