Errors and Warnings in WindMil. Kyle Titzer, P.E. EA Support

Transcription

1 Errors and Warnings in WindMil Kyle Titzer, P.E. EA Support

2 What are Errors and Warnings? Errors and warnings in WindMil indicate missing or invalid information, or incorrect setup of something within the model required for the current task The Errors and Warnings attempt to give the end user enough information to correctly identify and fix any issues with a model or its setup This will go through and cover many of the common E&W that are seen, as well as clarify some of the more cryptic messages that they give

3 When do you normally see E&W? We can group Error and warning types into 3 areas Running Circuit Diagnos<cs Running analysis Other areas Usually appear in the Error Browser, but can show as pop- up windows as well

4 Diagnos<cs E&W Circuit diagnos<cs mode is designed to check basic model data validity Equipment assignment to elements Equipment database values Other model setup and integrity checks, I.E. transformer input voltages, certain per unit values are within a correct range

5 Element AJributes Most elements types that have equipment fields need them assigned. Sources, lines, transformers, regulators, devices Some are assigned globally using defaults in the preferences. Load Mix, Construc<on Some are only needed for specific analysis. Motors, generators, load zones

6 Missing Equipment There are varying errors for each element type related to their respec<ve equipment If the error is not clear opening up the element may make the issue more obvious

7 Invalid Equipment Pointer for Regulator An equipment reference is all that is needed for diagnos<cs Analysis will need filled in equipment values

8 Missing Device Defini<on Devices that have not been defined will show up as an empty B symbol in the model Only need equipment and a group defini<on for most tasks

9 Missing/Invalid Impedance Defini<on Transformers need equipment assignment as well as some equipment values Transformer equipment is typically shared globally among elements of the same size Ex: only need one 15kVA Transformer defined

10 Invalid or Missing Cond Code This error can be associated with three different element types Overhead lines, Underground lines, and Sources can all be missing conductor code Technically an impedance code for Sources Lines need standardized impedance data from mfg. Sources need unique accumulated impedance

11 Equipment values Diagnos<cs checks the equipment values for any equipment assigned to an element in the current work environment Not all fields need to be filled in Transformers only need base KVA size Other fields only needed for specific Analysis Modes

12 Transformer Equipment Errors Transformer kva ra<ng 0.0 Transformer base kva from Nameplate needs to be filled in Base kva is used for all impedance calcula<ons Transformer is defined as 3- phase or 3- winding but configura<on is not 3 phase Transformer equipment is set as 3 Phase but the element is single or 2 phase

13 Overhead Equipment error Invalid Preferred Neutral for Conductor Check preferred neutral se_ng in the analysis manager

14 Overhead Construc<on Errors Null Construc<on Code Indicates that the line sec<on is set to using default construc<on, but no default has been defined Default is defined in Preferences System Preferences - modeling Zero Distance for Phase to Phase or Phase to Neutral check Construc<on Code phase and neutral loca<ons The construc<on has been defined on the element, or in the Preferences, but has not been populated Lines are occupying the same X,Y space, this will cause calcula<on errors

15 Underground Equipment Errors Underground are more complex, with the addi<on of concentric neutrals There are more fields filled out to define the neutral specifica<ons This causes addi<onal errors and warnings related to the individual fields

16 UG E&W Invalid Diameter Under Neutral OD of Cable on the UG Conductor Invalid Number of Strands and Concentric Type Neutral Calcula<on of Impedance Failed Find Impedance Method UG Cable Defini<on Error calcugcrc Failed

17 Zero Distance or Diameter The panic inducer! Most common warning seen on new models Deals with line sec<ons If no equipment data has been filled in this appears for every line sec<on Can be difficult to troubleshoot since it is caused by one of two separate issues

18 Zero Distance or Diameter - Causes Caused by either: Conductor Diameter Average Distance

19 Other Diagnos<c Checks Check rated Input voltage Voltage is 6000% of the parent BaseKv The transformers rated input voltage needs to be within a range of the voltage it is connected to Could be incorrect Source or upline transformer voltage Could be a transformer incorrectly inline (series transformers) High Bus Voltage Voltage is more than 1.2 pu

20 Check Rated Input Voltage Affected Transformer Upline Element

21 High Bus Voltage Seen on Source elements Caused by the Bus Voltage value being outside the accepted tolerance of the Base Out Voltage (± 20%) Ex: Base Voltage of 120, Bus Voltage of 126 Commonly caused by imports not using the correct units Import file expects per unit value to be Base Voltage agnos<c

22 Things Circuit Diagnos<cs will not check Correct Connec<vity Is the tap fuse actually connected in series? Coordinates Where is my model? Validity of equipment values We only check for a number, not a correct one Ampacity of 1? Diameter of 1? Transformer kva of 1? Element se_ngs Capacitor & Switch status Regulator and Device se_ngs

23 Analysis Errors and Warnings Each analysis mode requires specific data, and runs through specific rou<nes Errors include missing equipment data that is needed for certain analysis modes Errors encountered during analysis itera<ons and calcula<ons Will also include warnings and errors not fixed from diagnos<cs

24 Fault Current Fault current relies on the impedance model to run Any errors that were not fixed during diagnos<cs will remain and should be fixed for accurate results

25 Load Alloca<on Will start seeing errors and warnings related to having load on the model Errors related to overloading Errors related to load specific se_ngs Element se_ngs Model se_ngs Analysis Manager se_ngs

26 Load Control Point errors Desired kw is Less on LCP Less Than Fixed/Downline LCP kw Indicates that there are series LCP s where the downline LCP is using more load than the upline LCP can provide E.G. Upline LCP uses 100 kw, Downline LCP uses 200kW Not possible unless there is genera<on kw Less Than Fixed kw Plus kw Losses Indicates that there is a Load Group using the Diversity (Fixed) method Diversity (Fixed) kw amount and Coincidence Factor is more load than the LCP can provide

27 Swing kvar Applied To Group With No kw Occurs when the load group that is designated as swing PF does not get any load assigned to it Indicates other issues with Load Alloca<on Load Alloca<on Not Converging Does not give a specific cause Indicates other issues with Load Alloca<on Check other Errors and Warnings and fix them first Check for overloaded elements Check LCP and Load Group se_ngs Validate model data again

28 kva clamped at 70% This errors is commonly seen when a model has overloaded elements Deals with a combina<on of two se_ngs kva Load: This references the use of a Constant KVA Load Mix used on element in the model Clamped at 70%: This references the load voltage clamp Per Unit value defined in the analysis manager

29 Constant kva Load Mix Deals with reac<ve type loads (e.g. running motors) As the per unit Voltage decreases, the current increases to compensate If the Voltage gets to small the equa<on fails to come to a load flow solu<on The clamp se_ng prevents the per unit voltage to drop below that amount Once the voltage is clamped we treat the load as a Constant Current load ran at the clamp voltage. Default Load Mixes are 100% Constant kva This represents worse case scenario I= kva/v

30 kva clamped solu<ons Usually indicates overloading on the model but doesn t indicate a specific area or element Sort the model by lowest voltage, highest thru amps, or highest kw on element Check model validity Load data for the element, kwh, kw Consumer phasing and voltage Transformer sizing Secondary line size, length, equipment specs Change the Load Mix 100% Constant kva is not realis<c Most models are a blend of Constant kva and Constant Impedance

31 Summa<on of Losses (kw or kvar) WindMil uses two different methods to calculate losses on the Ran behind the scenes as an internal valida<on of results Losses calculated per element from I 2 *R are compared to total systems losses calculated from the Total kva, load, adjustments, charging etc.

32 Summa<on of Losses Causes and Fixes Can be caused by a Voltage Drop Tolerance that is too high Try lowering the tolerance in the analysis manager Check for other poten<al issue in the model Fix any other load related errors or warnings If no resolu<on is found call support

33 Load Mix Errors The Load Mix of a load bearing element must match the connec<on type of the element it is ajached to e.g. Wye, Delta, Center Tap Newer version of WindMil allow for default load mixes for each connec<on type Under System Preferences, top Load Mix op<on is only used if the rest are undefined

34 Load Mix Errors Delta Connected with Wye Connected Load Upline transformer is Delta secondary, but consumer Load Mix is set to Wye Load Defined Center Tap but Phase is not Two Center Tap Load Mix on a non- Center Tapped element Invalid Line Connect for Load Two Phase element with a Center Tapped Load Mix, but the transformer is not set as Center Tap Delta Connected Load Second Phase Deals with elements switching from Wye to Delta Ex: Load on A and B phases are combined into a single A- B Load Has been removed from newer version of WindMil

35 Voltage Drop All of these Errors and Warnings indicate overloading or bad load data on the model High Load on Phase of Element Voltage drop is greater than 150% on element Vd Greater Than One Double check the load values using the selected elements window Rerun Load Alloca<on and make sure the results look accurate

36 Other Errors and Warnings Could Not Get Memmap defaults Deals with the link to LightTable Delete MISshare.mem file Floa<ng Point Overflow Mainly occurs in 8.1 versions due to file corrup<on Access Viola<on Can be many causes, indicates an issue in the main func<ons Always close WindMil completely aser seeing this Error??? Call Support!

37 SQL Errors String or Binary data will be truncated Most common SQL error The External Table field has been set to a specific length, and the edit made within WindMil has exceeded that length Edit field length in SQL to allow longer entries Modifying a missing External Table row Missing table, missing row, or missing element record Incorrect Data Type Ex: entering a non- date value into a Date field

38 Ques<ons?