Method for monitoring a protective device
AssigneeSiemens Energy Global GmbH & Co. KG
InventorNils Stahlhut
Life of this patent
Estimating the term…
Abstract
A method for monitoring a protective device, which has a series circuit of a multiplicity of thyristors. The protective device has a series circuit of N>1 thyristors. The series circuit is connected in a parallel circuit with an electrical device to be protected. A snubber branch is connected in parallel with each thyristor. For the purpose of testing a firing capacity, n<N thyristors in a first thyristor group are fired when a positive voltage is present across the series circuit and a negative snubber current is flowing through the snubber branches of the thyristors in the first thyristor group.
Claims12
A method for monitoring a protective device, the protective device having a series circuit of N>1 thyristors connected in parallel with an electrical device to be protected, and a snubber branch connected in parallel with each thyristor, the method which comprises:
- testing a firing capacity by firing a number n<N thyristors in a first thyristor group when:
- a positive voltage is present across the series circuit of thyristors;
- and
- a negative snubber current is flowing through the snubber branches of the thyristors in the first thyristor group.
Dependencies are inferred from the claim text.