# US 2018/0024183 A1 · Method and apparatus for detection of power system disturbance within a digital substation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024183 A1 - Document ID: US20180024183A1 - Status: Published application - Kind: A1 - Application number: 15/701,221 - Filed: 2017-10-16 - Published: 2018-01-25 - Earliest claimed: 2015-03-11 - Assignees: ABB Schweiz AG - Applicants: ABB Schweiz AG - Inventors: Kai Liu; Youyi Li; Jianping Wang - Web page: https://patentgrep.com/patent/US20180024183A1 ## CPC - G01R 31/085: {in power transmission or distribution lines, e.g. overhead} - G01R 31/086: {in power transmission or distribution networks, i.e. with interconnected conductors} - G01R 31/088: {Aspects of digital computing} - H02H 7/265: {making use of travelling wave theory} - H02J 13/00: Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network - H02J 13/333: the equipment forming part of substations - Y04S 10/52: Outage or fault management, e.g. fault detection or location - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS ## Abstract An objective of the application is to provide a method for detecting a disturbance in a power system within a digital substation and an apparatus using the same. The method includes: sensing electrical parameters at an end of a transmission line; sampling the sensed electrical parameters; extracting traveling-wave information from high frequency component of the samples using a signal processing method; and if the extracted traveling-wave information indicating occurrence of the disturbance, transmitting the extracted traveling-wave information to an intelligent electronic device of the digital substation from a merging unit or non-conventional instrument transformer of the digital substation. As compared with the amount of the sample data of the sensed electrical parameters, the amount of the data representing the extracted traveling-wave information is reduced. Thus the extracted traveling-wave information can be transmitted via a data link with a relatively narrow bandwidth, such as the process bus under standard IEC 61850. ## Claims ### Claim 1 A method for detecting a disturbance in a power system within a digital substation, including: sensing electrical parameters at an end of a transmission line; sampling the sensed electrical parameters; extracting travelling-wave information from a high frequency component of the samples using a signal processing method; and if the extracted travelling-wave information indicates occurrence of the disturbance, transmitting the extracted travelling-wave information to an intelligent electronic device of the digital substation from a merging unit or non-conventional instrument transformer of the digital substation. ### Claim 2 (depends on 1) The method according to claim 1, wherein: the electrical parameters are voltage, current at the end of the transmission line. ### Claim 3 (depends on 1) The method according to claim 1, wherein: the travelling-wave information represents polarity, direction, amplitude, rate of change and/or timing of the travelling wave. ### Claim 4 (depends on 1) The method according to claim 1, wherein: the signal processing, method is one of wavelet transformation or filter-based signal processing method. ### Claim 5 (depends on 1) The method according to claim 1, further including: if the extracted travelling-wave information indicates existence of the disturbance, transmitting it to a disturbance recorder of the digital substation from a merging unit or non-conventional instrument transformer of the digital substation, ### Claim 6 (depends on 1) The method according to claim 1, wherein: the intelligent electronic device includes a protection relay and/or a fault locator. ### Claim 7 A disturbance detection apparatus for a power system within a digital substation, including: an electrical parameter sensor for sensing an electrical parameter at an end of a transmission line; a sampling device, for sampling the sensed electrical parameter; a processor, for extracting travelling-wave information from high frequency component of the samples using a signal processing method and judging if it indicates occurrence of the disturbance; and a transmitter arranged in a merging unit of the digital substation or a non-conventional instrument transformer of the digital substation, for transmitting the extracted travelling-wave information to an intelligent electronic device of the digital substation from the merging unit or the non-conventional instrument transformer if it indicates the occurrence of the disturbance. ### Claim 8 (depends on 7) The disturbance detection apparatus according to claim 7, wherein: the sampling device is arranged in the merging unit of the digital substation or the non-conventional instrument transformer of the digital substation. ### Claim 9 (depends on 7) The disturbance detection apparatus according to claim 7, wherein: the processor is arranged in the merging unit of the digital substation or the non-conventional instrument transformer of the digital substation. ### Claim 10 (depends on 7) The disturbance detection apparatus according to claim 7, wherein: the electrical parameter sensor is of a current transformer or as a part of the non-conventional instrument transformer. ### Claim 11 (depends on 7) The disturbance detection apparatus according to claim 7, wherein: the electrical parameter sensor is of a voltage transformer or as a part of the non-conventional instrument transformer. ### Claim 12 (depends on 7) The disturbance detection apparatus according to claim 7, wherein: the transmitter is further adapted for transmitting the extracted travelling-wave information to a disturbance recorder of the digital substation if it indicates existence of the disturbance. ### Claim 13 (depends on 7) The disturbance detection apparatus according to claim 7, wherein: the intelligent electronic device includes a protection relay and/or fault locator. ### Claim 14 (depends on 7) A digital substation, including: the disturbance detection apparatus according to claim 7; the merging unit or the non-conventional instrument transformer; and the intelligent electronic device. ### Claim 15 (depends on 2) The method according to claim 2, wherein: the travelling-wave information represents polarity, direction, amplitude, rate of change and/or timing of the travelling-wave. ### Claim 16 (depends on 2) The method according to claim 2, wherein: the signal processing method is one of wavelet transformation or filter-based signal processing method. ### Claim 17 (depends on 2) The method according to claim 2, further including: if the extracted travelling-wave information indicates existence of the disturbance, transmitting it to a disturbance recorder of the digital substation from a merging unit or non-conventional instrument transformer of the digital substation. ### Claim 18 (depends on 8) The disturbance detection apparatus according to claim 8, wherein: the processor is arranged in the merging unit of the digital substation or the non-conventional instrument transformer of the digital substation. ### Claim 19 (depends on 8) The disturbance detection apparatus according to claim 8, wherein: the electrical parameter sensor is of a current transformer or as a part of the non-conventional instrument transformer. ### Claim 20 (depends on 11) The disturbance detection apparatus according to claim 11, wherein: the transmitter is further adapted for transmitting the extracted travelling-wave information to a disturbance recorder of the digital substation if it indicates existence of the disturbance.