Protection relay
AssigneeABB Technology AG
InventorsKari VANHALA, Petri KOIVULA
Life of this patent
Estimating the term…
Abstract
A protection relay for protecting an electric system, includes means a manner of a time multiplier value, a manner of calculating, with the received time multiplier value, and an inverse definite time dependency having an exponentiation function. The dependency defines a relationship between an excitation level of an input signal to the relay and an operating time of the relay. The relay further a manner of shifting the dependency to a predefined calculation space, and includes a manner of applying, during execution, the dependency shifted to the predefined calculation space when determining an operating condition of the relay.
Claims16
A protection relay for protecting an electric system, comprising:
- a receiver configured to receive a time multiplier value;
- a calculator configured to calculate, with the received time multiplier value, an inverse definite time dependency having an exponentiation function, wherein the dependency defines a relationship between an excitation level of an input signal to the relay and an operating time of the relay;
- a shifter configured to shift the dependency to a predefined calculation space;
- and
- an applier configured to apply, during execution, the dependency shifted to the predefined calculation space when determining an operating condition of the relay.
The method of protecting an electric system, comprising:
- receiving a time multiplier value;
- calculating, with the received time multiplier value, an inverse definite time dependency having an exponentiation function wherein the dependency defines a relationship between an excitation level of an input signal to the relay and an operating time of the relay,
- shifting the dependency to a predefined calculation space;
- and
- applying, during execution, the dependency shifted to the predefined calculation space when determining an operating condition of the relay.
A protection relay for protecting an electric system, comprising:
- means for receiving a time multiplier value;
- means for calculating, with the received time multiplier value, an inverse definite time dependency having an exponentiation function, wherein the dependency defines a relationship between an excitation level of an input signal to the relay and an operating time of the relay;
- means for shifting the dependency to a predefined calculation space;
- and
- means for applying, during execution, the dependency shifted to the predefined calculation space when determining an operating condition of the relay.
An exemplary computer program product is disclosed including a computer usable medium having a computer readable program code recorded therein, wherein when said computer program product is in communicative contact with a processor, the program code causing the processor to execute the steps of:
- receiving a time multiplier value;
- calculating, with the received time multiplier value, an inverse definite time dependency having an exponentiation function wherein the dependency defines a relationship between an excitation level of an input signal to the relay and an operating time of the relay;
- shifting the dependency to a predefined calculation space;
- and
- applying, during execution, the dependency shifted to the predefined calculation space when determining an operating condition of the relay.
Dependencies are inferred from the claim text.