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Resonant Earthing & Earth-fault Detection


In New Zealand and Australia, there is an increasing demand to reduce the number of supply interruptions experienced by consumers. For Network owners there is also a statutory requirement to meet minimum SAIDI and CAIDI standards. One way of substantially improving these is to be able to operate the network safely and in continued operation in the presence of earth faults.

Resonant Earthing solutions are now engineered and delivered as complete systems for New Zealand and Australian utilities by HV Power. Utilising products from A.Eberle and EGE, a Petersen coil is connected between the neutral point of the supply transformer and earth. This is controlled by the REG-DP/DPA controller which tunes the coil to match the system capacitance, thus compensating the fault current. Each feeder circuit is monitored by an EOR-D relay which detects earth-faults on the system and provides feedback via through SCADA interface to the network control centre.

Marketed under the name RE+DS (“Resonant Earthing + Earth-fault Detection Systems”), the individual components are also available for separate applications, such as Earth-fault detection and location on non RE+DS systems.

Download RE+DS brochure(PDF, 1.5 MB)


Petersen Coils & Earthing Transformers

EGE Petersen Coil

EGE, headquartered in Ceske Budejovice in the Czech Republic, is a company specialising in the manufacture of equipment for the power engineering industry. EGE has over 60 years experience in the manufacture of Petersen coils and are a market leader in Europe. In addition they have extensive experience in the manufacture of earthing resistors and earthing transformers.

All their production facilities are ISO 9001 and ISO 14001 accredited. Customers of EGE include ABB, AREVA, ENEL, E-ON, Siemens and Voith.

HV Power offer the EGE Petersen coil together with A.Eberle controllers as a complete turnkey solution for use on 11kV and 33kV networks.

Download RE+DS brochure(PDF, 1.5 MB)


Petersen Coil Controllers



Using the same hardware as our very popular REG-D/DA voltage regulators, the REG-DP and REG-DPA are controllers for Petersen coils. Offering powerful and flexible SCADA interface options, the REG-DP/DPA provide full Petersen coil control and monitoring. The controller also provides the interface for the earth-fault detection units, thus simplifying installation.

More info on REG-DP & REG-DPA
Download RE+DS brochure(PDF, 1.5 MB)


Earth-fault Detection



The EOR-D relay monitors each feeder in a compensated system and provides prompt and accurate remote indication upon which feeder the earth-fault is located. The EOR-3D can be located thoughout the network to act as fault passage indicators. The EOR-3D allows line crews to quickly identify the area the fault is located within.

See our Fault Current Indicators product page for information on products for use on non compensated systems.

More info on EOR-D & EOR-3D
Download RE+DS brochure(PDF, 1.5 MB)