GE MiCOM P40 Agile Technical Manual

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Contents

SCADA Communications P44x/EN SC/Hb6MiCOM P40 Agile P442, P444 (SC) 12-375.5 Object 20 binary countersObject 20, binary counters, contains cumulative counters and measurements. The binarycounters can be read as their present ‘running’ value from object 20, or as a ‘frozen’ valuefrom object 21. The running counters of object 20 accept the read, freeze and clearfunctions. The freeze function takes the current value of the object 20 running counter andstores it in the corresponding object 21 frozen counter. The freeze and clear function resetsthe object 20 running counter to zero after freezing its value.5.6 Object 30 analog inputObject 30, analog inputs, contains information from the relay’s measurements columns in themenu. All object 30 points are reported as fixed-point values although they are stored insidethe relay in a floating-point format. The conversion to fixed-point format requires the use of ascaling factor, which differs for the various types of data within the relay e.g. current, voltage,phase angle etc. The data types supported are listed at the end of the device profiledocument with each type allocated a ‘D number’, i.e. D1, D2, etc. In the object 30 point listeach data point has a D number data type assigned to it which defines the scaling factor,default deadband setting and the range and resolution of the deadband setting. Thedeadband is the setting used to determine whether a change event should be generated foreach point. The change events can be read via object 32 or object 60 and will be generatedfor any point whose value has changed by more than the deadband setting since the lasttime the data value was reported.Any analog measurement that is unavailable at the time it is read will be reported as offline,e.g. the frequency when the current and voltage frequency is outside the tracking range ofthe relay or the thermal state when the thermal protection is disabled in the configurationcolumn. Note that all object 30 points are reported as secondary values in DNP3.0 (withrespect to CT and VT ratios).5.7 DNP3.0 configuration using MiCOM S1 AgileA PC support package for DNP3.0 is available as part of the settings and records module ofMiCOM S1 Agile . The S1 module allows configuration of the relay’s DNP3.0 response. ThePC is connected to the relay via a serial cable to the 9-pin front part of the relay – seeIntroduction (P44X/EN IT). The configuration data is uploaded from the relay to the PC in ablock of compressed format data and downloaded to the relay in a similar manner aftermodification. The new DNP3.0 configuration takes effect in the relay after the download iscomplete. The default configuration can be restored at any time by choosing ‘All Settings’from the ‘Restore Defaults’ cell in the menu ‘Configuration’ column. In S1, the DNP3.0 datais displayed on a three-tabbed screen, one screen each for object 1, 20 and 30. Object 10 isnot configurable.5.7.1 Object 1For every point included in the device profile document there is a check box for membershipof class 0 and radio buttons for class 1, 2 or 3 membership. Any point that is in class 0 mustbe a member of one of the change event classes 1, 2 or 3.Points that are configured out of class 0 are by default not capable of generating changeevents. Furthermore, points that are not part of class 0 are effectively removed from theDNP3.0 response by renumbering the points that are in class 0 into a contiguous list startingat point number 0. The renumbered point numbers are shown at the left-hand side of thescreen in S1 and can be printed out to form a revised device profile for the relay. Thismechanism allows best use of available bandwidth by only reporting the data points requiredby the user when a poll for all points is made.5.7.2 Object 20The running counter value of object 20 points can be configured to be in or out of class 0.Any running counter that is in class 0 can have its frozen value selected to be in or out of theDNP3.0 response, but a frozen counter cannot be included without the correspondingrunning counter. As with object 1, the class 0 response will be renumbered into a contiguouslist of points based on the selection of running counters. The frozen counters will also berenumbered based on the selection; note that if some of the counters that are selected asrunning are not also selected as frozen then the renumbering will result in the frozen