With the IP protocol the number of simultaneous connections to SEL’s Phasor Data Concentrator (PDC) is limited to six, each with a dedicated IP address. Typically, C37.118 data frames are transmitted either over a serial link or over a data connection using the IP protocol.
This method of communication is, understandably, not well suited for the human observer interested in the data. The configuration frame contains information about the data format to enable a client to correctly interpret subsequent data frames. The format of the data can vary and is defined during runtime by a so called “configuration frame,” which is the first frame sent to a client. With C37.118, data frames are usually transmitted as a binary stream of values. Furthermore, the C37.118 specifies the format of the transmitted phasor data. This standard defines (a) the synchronized phasor measurements that are used in a power system and (b) the communications protocol for transmitting the data points in real-time. Synchrophasors adhere to the IEEE C37.118 standard. Analysis of this information helps to prevent many power system problems such as rolling blackouts.” In a Synchrophasor system, these measurements are taken at many different places on a power system grid at the same time. Power engineers analyze the Synchrophasor measurements to understand the state of the power system. A phasor measurement is a measurement of the voltage or current at a particular time and place. However, what is a Synchrophasor? SEL refers to Synchrophasors as “time-synchronized phasor measurements of electrical power in a power system. In addition to the main requirements the proposed solution must:
The University of Idaho in partnership with SEL (Schweitzer Engineering Laboratories) selected the OPC Linux Toolbox from Softing AG, based near Munich, Germany, and with North American offices in Newburyport, Mass., for implementing a customizable OPC XML-DA client. The goal of the project is to create a “product” that power and electrical distribution companies can use to monitor their networks of Synchrophasor devices. A Senior Capstone Design Team of the University of Idaho is in the process of developing an OPC XML-DA Client solution that connects to a network of Synchrophasor devices and allows the use of OPC to retrieve data from the devices.
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