Method and arrangement for detecting short-circuits in circuit branches of electrical power system networks
AssigneeSiemens Aktiengesellschaft
InventorsReinhard Maier, Walter Roethlingshoefer
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Abstract
According to the present invention, a pulse of short duration is generated from system voltage and is applied to a circuit branch being tested. The resulting current is measured and subjected to a comparative evaluation. The corresponding arrangement has a power semiconductor circuit for generating the testing pulse from the system voltage. Preferably, a so-called GTO (Gate Turn-Off thyristor) is used for this purpose.
Claims15
A method for detecting short-circuits in circuit branches of an electrical power system network comprising steps of:
- a) generating a voltage pulse of short duration from system voltage;
- b) applying said voltage pulse generated in step (a) to a circuit branch to be tested;
- c) measuring current resulting from said voltage pulse in the branch to be tested;
- d) supplying the current measured in step (c) to an evaluation circuit;
- and
- e) comparing said measurement to a setpoint-value.
In a power system network having a voltage, a device for testing a candidate branch to be switched into the power system network for a short circuit, said device comprising:
- a) a power semiconductor circuit for generating a test pulse from said voltage of said system network and for injecting said test pulse into said candidate branch;
- b) a measurement device for measuring current in said candidate branch resulting from said injected test pulse;
- and
- c) a comparator for comparing said current measured by said measuring device with specified limiting values to determine whether said candidate branch is short circuited.
Dependencies are inferred from the claim text.