FIELD: surge protection of power-network and substation electrical equipment.
SUBSTANCE: proposed protective device designed for protecting electrical equipment
against high-frequency voltage surges (primarily switching surges) has double-unit coaxial resistor whose internal unit is made of high-conductivity non-ferromagnetic material and external one, of high-resistivity ferromagnetic material (ρ > 1 Ohm-m); it also has additional resistor connected in parallel with coaxial-resistor internal unit. Functioning as the latter is usually phase conductor. Coaxial-resistor external unit is made of set of toroidal cores fitted onto conductor. Insulating gaskets are placed between ferrite cores.
EFFECT: enhanced protective efficiency without enhancing size and mass of device.
8 cl, 8 dwg
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|---|---|---|---|
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| COMBINED DEVICE FOR COAXIAL TRANSMISSION LINE BUILT AROUND ARRESTER AND AC POWER EXTRACTOR | 1997 |
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