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Distribution transformers : self-protecting
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Protection and disconnection function - TPC
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Main Characteristics : |
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The objective is to be able to confine all faults within the tank, and to remove risks of explosion or projection of oil. By a carefully designed coordination with the HV / MV substation's protection system, the break in supply will be limited to only those customers who are directly dependent on the faulty transformer.
The guarantee of a three-phase network disconnection excludes all dangerous supply scenarios of a single-phase internal fault, and avoids the supply of abnormal LV voltages.
Photo legend:
3 striker fuses designed for dealing with high currents, located in wells filled with oil, act on a device which causes disconnection via a mechanical link. An additional wire fuse, integrated with the earth circuit allows cut-out at weak currents
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Standards : |
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HN 52-S-24 |
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Advantages : |
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- Adaptation to resonant neutral grounding by taking into account low-energy earth faults (detection before tripping the HV / MV substation protection down to values of 5 Amp after 250ms)
- Direct treatment of the faulty current, with no consequences such as over-pressure or low level
- Three-phase disconnection ensured by mechanical link
Photo legend:
Application for pole-mounted substations combining the advantages of TPC and the possibility for live work by synthetic bushing
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