For the galvanically isolated, proportional conversion of alternating currents of high current strengths into smaller, directly measurable values
Depending on their use, a distinction is made between two types:
- measuring transformers
- protection transformers
All current transformers are designed for use in low-voltage networks with a maximum conductor-conductor voltage of 0.72 kV.
Measuring transformers
Measuring transformers are used to measure current, power, power factor and energy consumption by direct use of a corresponding measuring instrument. By dimensioning their magnetic circuit, measuring transformers enable high transmission accuracy in the rated current range, while at the same time protecting the connected devices in the event of overcurrent. This protection is caused by the magnetic saturation of the measuring core that occurs in the event of overcurrent.
Protection transformers
Protection current transformers are used to control protective relays, which have the task of disconnecting downstream circuits in the event of overcurrent. For safe operation of these relays, proportional transmission behavior of the transformer up to a multiple of the rated current is required. The dimensioning of this transformer design ensures proportional current transmission up to a multiple of the rated current determined by the protection class.
Technical standards
All current transformers are manufactured in accordance with the technical requirements of IEC 61869/1+2 (formerly IEC 60044-1).
Technical features
Place of use: indoor, without condensation