Intelligent process interface and substation automation system
First Claim
1. An Intelligent Process Interface (IPI) of a Substation Automation (SA) system for a substation of an electric power system, the IPI comprising:
- a processing module configured to issue a command signal for operating a switching device of the substation, and to generate and transmit, over a communication network of the SA system, a network message comprising sampled values of a first signal and a second signal, the signals being measured by at least one of an Instrument Transformer (IT) and a sensor connected to the IPI via an input interface, said sampled values being generated and transmitted by the IPI;
wherein the processing module is configured to generate the command signal based on the first signal;
wherein a merging unit comprises current and/or voltage measurement outputs and sensors connected to said merging unit;
wherein said IT and said sensor include a compensation of a total time delay by using a digitally processed synchronization filter;
wherein said total time delay includes the sensor delay and the channel data processing delay; and
wherein said sampled values are synchronized by using two channels in which new samples are formed.
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Abstract
This specification discloses an intelligent and digitalized process level interface which is referred to herein as an Intelligent Process Interface (IPI). The input of the IPI includes both analog and digital channels and therefore the IPI can be used for substations in transition or retrofit stages with both conventional and non-conventional primary devices. The IPI acts not only as a digitalized interface, but also as an intelligent supervisory and control unit for switching functions. The architecture of the IPI is flexible and allows for the functionality to be distributed to several devices.
15 Citations
14 Claims
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1. An Intelligent Process Interface (IPI) of a Substation Automation (SA) system for a substation of an electric power system, the IPI comprising:
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a processing module configured to issue a command signal for operating a switching device of the substation, and to generate and transmit, over a communication network of the SA system, a network message comprising sampled values of a first signal and a second signal, the signals being measured by at least one of an Instrument Transformer (IT) and a sensor connected to the IPI via an input interface, said sampled values being generated and transmitted by the IPI; wherein the processing module is configured to generate the command signal based on the first signal; wherein a merging unit comprises current and/or voltage measurement outputs and sensors connected to said merging unit; wherein said IT and said sensor include a compensation of a total time delay by using a digitally processed synchronization filter; wherein said total time delay includes the sensor delay and the channel data processing delay; and wherein said sampled values are synchronized by using two channels in which new samples are formed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A Substation Automation (SA) system for a high or medium voltage substation of an electric power system, the SA system comprising:
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an Intelligent Electronic Device (IED) configured to perform at least one of protection, control and monitoring functions based on signals being indicative of a process quantity of a substation and originating from at least one of an Instrument Transformer (IT) and a sensor arranged in the substation; a SA communication network; and an Intelligent Process Interface (IPI) connected to the IT and sensor via an input interface and connected to a switching device for transmitting a command signal, wherein the IPI is configured to generate the command signal based on a signal received from at least one of the IT and sensor, wherein the IPI is configured to generate and transmit, over the SA communication network, a network message comprising sampled values of a first signal and a second signal, the signals being measured, respectively, by the IT and the sensor, and wherein the IPI further comprises a digital synchronization filter for synchronizing the first and second signals by compensating a total time delay, the total time delay including a channel data processing delay and a delay inherent to, respectively, the IT and sensor. - View Dependent Claims (12, 13, 14)
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Specification