GE B30 Communications Manual

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3-12 UR FAMILY – COMMUNICATIONS GUIDEOVERVIEW CHAPTER 3: IEC 61850 COMMUNICATION3the interval of periodic reports. OptFlds is a bitmapped value, wherein each bit specifies whether an optional particularfield is to be included in the message: sequence-numer, report-time-stamp, reason-for-inclusion, data-set-name, data-reference, buffer-overflow, entryID, and/or conf-revision.3.1.7 CommandsIEC 61850 controls are complex. The following is a brief description.From a UR perspective, you can issue open or close controls to the UR Breaker Control element using IEC 61850controllable points.This is accomplished by standard IEC 61850 models and services. Bkr0XCBR1.Pos is a DPC (Dual Point Control) point thatdrives the Breaker Control 1 element. BkrCSWI1.Pos is also a DPC point that drives the Breaker Control 1 element. Ofcourse, the Breaker Control element can be used entirely outside of IEC 61850 by using FlexLogic operands as the controlinputs.Similarly Disc0XSWI1.Pos and/or DiscCSWI1.Pos can be used to control the Disconnect Switch 1 element.From an IEC 61850 standard perspective, controllable points can be SPC (Single Point Control, as used to control UR VirtualInputs), DPC (Dual Point Control, as used to control UR Breaker Control and Disconnect Switch elements), or other lesscommon control types.Bkr0XCBR1.Pos is a DPC. It supports all IEC 61850 control models. The Pos.ctlModel attribute selects the control model,where1 = Direct Control with Normal Security2 = SBO Control with Normal Security3 = Direct Control with Enhanced Security4 = SBO Control with Enhanced SecurityIn order to execute the IEC 61850 control services, you need to know the value of ctlModel. For Direct Control with NormalSecurity, an IEC 61850 Client can write to the Pos.Oper structure. The entire Pos.Oper structure must be written in one MMSwrite transaction. Pos.Oper.ctlVal determines whether the control is "open" or "close".For SBO Control with Normal Security, the Pos.SBO element is used. A read of this element is the "select" operation. ThePos.Oper structure can then be written as described above.For Direct Control with Enhanced Security, only the Pos.Oper element is used. The client must write the entire Pos.Operstructure in one MMS write transaction.For SBO Control with Enhanced Security, the Pos.SBOw element must be written first. This is the "select" operation. ThePos.Oper element can then be written.Note that the SBOw element is always present if SBO with Enhanced Security is supported for a particular point, regardlessof the current value of ctlModel. Similarly, the SBO element is always present if SBO with Normal Security is supported,regardless of the current value of ctlModel.3.1.8 Substation Configuration Language (SCL)The Substation Configuration Language (SCL) is a file format defined by IEC 61850-6 to describe/specify in a wayunderstandable by configuration tools of different manufacturers the capabilities and configuration of IEDs andcommunication systems, as well as the relations between the utility automation system and the substation/switch yard,and describe the switch yard topology.SCL is based on the Extensible Markup Language (XML) version 1.0, and specified in IEC 61850-6 using the XML Schemalanguage. Both the SCL language and the XML Schema language are complex; only SCL features needed to obtain a highlevel understanding of SCL files are discussed here.An SCL file, being an XML file, consists of a root element, which contains child elements, which in turn contain childelements, and so on. In SCL files, the root element is named SCL. Its standard child elements are as follows:• Header, which can be used to identify the SCL file, its version, and history• Substation, each of which describes the topology of a substation and either the assignment of logical nodes in theIEDs to power system elements or the required types of logical nodes for each of its power system elements