Arc Suppression Coils
11Pages

The most common type of failure in an electrical power distribution network is a single phase-to-earth fault. Many mitigating the effects of this earthfault compensation In this scheme the system neutral is earthed through a high impedance reactor, a so called arc suppression coil (Petersen coil), which is variable arc suppression coils, earthfault current, and there- fore optimal efficiency of the resonant earthing technique

electrical power distribution network is subject to dynamic the arc suppression coil used for neutral earthing must be Two basic principles to vary whereby coil sections are magnetic circuit by means of a mechanical drive (plunger core coil). The earthfault protection system developed by Trench Austria favours the plunger core coil compared to a reactor which is adjustable in finite steps, as required (preferable since switching can easily lead to network perturbations • plunger core coils can be tuned precisely to minimum current at the fault location coil design concept was thoroughly...

Principle Construction Fig. 2 Principle construction of an arc suppression coil 5

Technical Data installation indoor or outdoor

Standard Design / - ¡ron cored, oil insulated coil with continuously variable air plunger core the Trench Austria earthfault compensation controller - motor drive unit: Trench with hand-crank for emer- gency service and potentio- meter for remote position indication, with separate control cabinet mounted on the side wall of the tank at operational height - in oil-filled corrugated steel tank with air cushion naphthenic basis, PCB-free, - mobile base with bi- directional rollers voltage bushings - voltage measuring winding - power auxiliary winding 30 s short time duty) for current injection...

Abb. 4 77AÍ3 kV, 31500 kVAr, short time duty 2h Special Designs / Optional Equipment - steel tank with flange mounted radiators - double float Buchholz relay - various insulating fluids - current transformer - power auxiliary winding (with extended power rating, continuous or short time - minimum oil level indicator with indicating contacts - magnetic type oil level indicator with/without indicating contacts - plug-in cable termination - surge arrester - different motor drive types - alternative motor voltages - devices for remote indication - supplementary resistor mounting...

resistive residual current - skid base Simplified design for a power range within 200-1250 kVAr, current regulation range 1:5 with hand or motor drive. plunger core ASCs. Neutral Earthing corresponding earthing common oil-filled steel tank. For a detailed description refer Earthing Aggregates. Iron core coil with multiple network sections, without adjustment device. Earthing Aggregat Design with epoxy resign impregnated windings. Fig. 5 Dry Type Neutral Earthing Aggregate 6 kV/ 400 kVAR

Shunt Resistor In order to eliminate earthfaults rapidly, the faulty feeder wattmetric directional relays. When this approach is used it is increase the residual earthfault current via a low voltage shunt power auxiliary winding of the Fig. 6: air cooled resistor in stainless steel enclosure, protection class IP23, electrically connected to the power auxiliary winding, including contactor and thermal overload

Earthfault Compensation When changes occur in the suppression coil must be modified network. This task is achieved by the Trench Austria earthfault compensation detailed description refer to Compensation Controller Fig. 7 Earthfault Compensation Controller EFC50 The electronic resistor control low voltage shunt resistor power auxiliary winding of the arc suppression coil. It also power auxiliary winding of the ASC from thermal overload.

Trench Austria GmbH email sales.at@trench-group.com Trench Brasil LTDA Contagem, Minas Gerais/Brasil email sales@trench.com.br Subject to change without notice Trench China Limited 3658 Jiang Cheng Road email sales.cn@trench-group.com email sales.fr@trench-group.com Trench Germany GmbH email sales.de@trench-group.com email sales.it@trench-group.com Trench Limited Coil Product Division 71 Maybrook Drive, Scarborough email sales.ca@trench-group.com Trench Limited Instrument Transformer Division 390 Midwest Road, Scarborough email sales.ca@trench-group.com email sales.ch@trench-group.com South...