Earth Leakage Protection instrument transformers

These ring type current transformers are available for indoor (ORF) or outdoor use (ORFE). They have been designed to meet the requirements for metering and protection duties of:
- power transformers and auto-transformers
- HV or MV wall bushings
- GIS substation
- IPB
- Homopolar detection in neutral connections

The secondary terminals are accessible either directly in the case of indoor equipment (ORF) or through a watertight terminal box in the case of outdoor application (ORFE).

As per customer’s requirement, secondary windings can integrate time constant constraints.

Ces transformateurs de mesure sont en résine époxy moulée autoextinguible et possèdent de série un isolement renforcé.

Ils sont équipés d’un capot étanche muni de 2 presse étoupes. Cette gamme est conforme aux exigences des normes EN 50014 et EN 50019 “sécurité augmentée”.

English version coming soon!

These Current Transformers have been designed and developed in close collaboration with RTE, the French Electricity Network, to match the most stringent requirements of outdoor substations.

- Their « window type » design makes it possible to install them under Extra High Voltage (EHV) environment taking advantage of the insulation of primary (cable, GIS busducts, wall bushing, …)

- The CT’s with ref ATOA, ATOX, ATOY for outgoing differential protection are equipped with a filter capacitor to limit the high frequency voltage peaks showing during connect/disconnect cycles, or in case of fault on the network, and of a voltage limiter protecting CT against overvoltage in case of secondary open circuit.