Externally Gapped Line Arrester
AssigneeABB Power Grids Switzerland AG
InventorHannu Ruokolainen
Life of this patent
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Abstract
An externally gapped line arrester, EGLA, for transmission lines, the EGLA including a series varistor unit, SVU, having a first end and a second end, the SVU configured to be connected between a transmission line and ground, a primary sparkover gap unit serially connected to the first end of the SVU, a secondary gap arranged between the second end of the SVU and ground, and the secondary gap serially connected to the second end of the SVU, a shorting-link device connected in parallel with the secondary gap, and a disconnecting device arranged in the shorting-link device, the disconnecting device configured to open the shorting-link device when the SVU is overloaded. A method for impulse protection performed by an EGLA is also disclosed.
Claims19
An externally gapped line arrester, EGLA, for transmission lines, comprising:
- a series varistor unit, SVU, having a first end and a second end, the SVU configured to be connected between a transmission line and ground;
- a primary sparkover gap unit serially connected to the first end of the SVU;
- a secondary gap arranged between the second end of the SVU and ground, and the secondary gap serially connected to the second end of the SVU;
- a shorting-link devices connected in parallel with the secondary gap;
- and
- a disconnecting device arranged in the shorting-link device, the disconnecting device configured to open the shorting-link device when the SVU is overloaded.
A method for impulse protection for transmission lines, the method being performed in an externally gapped line arrester, EGLA, the method comprising:
- when a series varistors unit, SVU, connected between a transmission line and ground is overloaded, by sparkover of a primary sparkover gap unit serially connected between a first end of the SVU and the transmission line;
- opening a shorting-link device by a disconnecting device, the shorting-link device arranged in parallel with a secondary gap serially arranged between the second end of the SVU and ground.
Dependencies are inferred from the claim text.