• The format of MOV arrester corrected (column 25, 50 and 75)
• The node attributes for hidden objects and nodes not written on screen (name and ground symbol).
• The UserNamed attribute for nodes was introduced in version 2.4++, but not reset when a group was copied. This could result in duplicate node name conflicts without warnings when a group was imported with the Keep node names option. The UserNamed attribute tells if the user has given a name to the node and in such case it appears black on screen so that the user knows where to change the node name without receiving duplicate warnings. ATPDraw 3.0 corrects this problem when reading old version 2.4 files.
• The user is not allowed to specify a node name starting with 'X'. This removes the possible conflict between ATPDraw and user generated node names.
• The general 3-phase, 3-windings saturable transformer corrected (Dlead renamed to Dlag, D11 renamed to Dlead, Dlag replaced by Y180). The coupling icons and the help file are updated. In this way all types of Y-D couplings are supported. 
• Bug in universal machine node naming corrected and D-connection corrected similar to saturable transformer.Initial UM conditions for rotor currents fixed. The UM help files are updated to give information on the inductance units.
• A capacitor with initial voltage conditions and one node grounded is written to the ATP file with zero the intial voltagen on the grounded node and an adjusted voltage on the other node so that the voltage difference is as intended by the user.
• Some old errors related to transposition and splitter objects for 3-phase circuits are corrected. Older circuits files produced on previous ATPDraw versions will now be correct in v 3.0. A secondary Splitter error (3-phase back-to-back problem) was corrected in version 3.4.
• Bugs in Hybrid transformer model. Zero sequency rescaling error. A sqrt(3) error was introduced for Delta-couplings when the test report capabilities were extended in version 4.2. The conversion from the Frolich equation to a piecewise nonlinear characteristic failed for small transformers. The modeling of core losses was incorrect for the yokes. The frequency dependent winding losses was fitted with two foster celles taking only the resistance into account, but the imaginary part should be minimized as well.
• Compress+Cancel resulted in Node naming error as the reference to the (cancelled) group was not removed. Fixed in 5.7.

• Bug in group copy/paste between circuits is fixed. When copying a group to another circuit and closing down the original circuit, the support file for the objects was unintentionally removed.
• An erased ground symbol is no longer drawn when editing nodes.
• The node naming warnings Same name on different nodes and Duplicate name of node appear once for each event.
• Drag icon on/off works in View|Options
• Circuit fonts user selectable in View|Set circuit font 
• Buttons for sorting line constants cards are added to the LCC dialog box.
• The Delete button in the Characteristic page is fixed to avoid the never ending "Illegal numeric specification!" message when the first data point is deleted.
• ATP now runs much faster under the LCC and BCTRAN windows. Instead of checking the process status continuously this is done only every second.
• Two new type 15 sources, STANDLER and CIGRE are added to the standard library.
• It is possible to customize the icon for the LCC components (Edit icon at the bottom of the LCC dialog box).
• The node handling in LCC objects was wrong in patch 5 and 6. In some cases 5-character 3-phase names was written in the $Include call.
• The delete temporary file option, awkwardly introduced in patch 2-3 and available as optional later is completely removed. The option is anyway dangerous when sevral instances of ATPDraw is launched. It is now up to the user to tidy up the directories. Still, all required files are stored in the projects, so deletion should be safe.
• the format error (missing period) when ATPDraw created to ATP-file is fixed. This error has been present for a long time. Example 12345.678 was written 12345 instead of 12345. 
• Pocket Calculator placed after the /REQUEST card at the end of the ATP-file.
• Transposition error corrected. Circular transpositions allowed if the phase sequence is correct.
• An error in ATPDraw.scl related to the LCC_6.sup object corrected (Kind for nodes should reflect the circuit number).
• The ATP|Settings/Additional page is handled correctly when switching between circuits.
• It is now possible to ground an input to Models from 3.5 p10.
• A bug in line width for /STATISTICS output is fixed
• The Additional ATP card window (free format input) is wider and thus easier to edit.
• A bug related to Groups and gridsnap is fixed. All components was drawn in the neares 10 pixel position except for sub-circuits. This could result in a problem under Edit group if one of the component was moved.
• The problem with the decimal point '.' is probably fixed! ATPDraw forces internal usage of '.' regardless of the (Regional) settings in the Windows control panel (no news here). However, it was discovered that this internal setting was changes if another program directly changed the registry setting of the decimal point to ',' while ATPDraw was running. This is really bad programing practice, but unfortunately typical for Office products. When the registry setting changed ATPDraw automatically updated it's internal setting. When realizing this I found out that it was possible to turn this automatic update "feature" off in ATPDraw. 
• A problem with $UNITS -1, -1 (reset of units) in BCTRAN output with AR option is fixed. ATP adds $UNITS -1, -1 at the end of the punch file always. This card is now removed by ATPDraw if no other $UNITS cards are found in the punch file (which is the case for AR output). This error was effective if Xopt and Copt had other values than zero, and in this case the single $UNITS -1,-1 card really reset Xopt and Copt to zero.

• Version 3.6 was launched as a test version using an updated compiler (Delphi 6.0) after some reports on problems on the new Windows XP operating system. The version seemd to solve the problems and the following ATPDraw versions used Delphi 6.0
• The removement of the Mutual button in Line/Cable verify introduced in 3.5p5 resulted in a run-time error the second time verify (LMFS) was selected.
• Improved handling of $UNITS, -1, -1 cards for PI-models under line/cable modelling.
• Hiding a group object resulted in a pointer error and program crash. 
• Transposition objects failed in large circuits. Fixed in patch 4.
• The new nonlinear inductance components with initial conditions improved.
• BCTRAN Triplex core fixed for three phase cases.
• The new capacitor component CAP_RS failed when a parameter was specified for the capacitance rather than a value. Still it is not possible to combine an $Parameter specification with an automatic damping resistor, simply because the capacitance value is unknown to the component.
• UM machines 6&8 failed due to true blank lines in the ATP-file in combination with sorting by cards (ATP version dependent problem?). Zeros added instead for the stator coils.
• Type 94 branch output request stored in project file.
• The BRANCH-request removed from LMFS data cases (Line/Cable Verify) (PI-models). This card in not needed and resulted in a runtime error with newer ATP versions. 
• Better support of multi-sectional cable constant pi-model. Cross bonding and non-homogeneous models supported.
• Radio buttons replace the U/I-code for all sources.
• TACS device 55 (digitizer) included.
• GIFU switches (Valve and TACS switch) supported and a new example file Exa_13.adp included.
• The View module for nonlinear characteristics is improved. The values are scaled to ensure a sufficient resolution.

• An ATP-file error for small values fixed in version 3.8 (3.456E-5 was written as .00003 instead of 3.4E-5). For the new transfer function objects HI_PASS, LO_PASS, INTEGRAL, DERIV zero was written to the ATP-file when a small gain was specified. In general the problem occured when the negative exponent was one less than the number of characters available.
• BCTRAN single phase case. Voltage devided by sqrt(3)
• The number of phases editable in the LCC dialog box (the user do not have to select the number of phases first). Changing the number of phases will automatically update all objects and icons using the same LCC-file.
• The file extension *.dat for ATP-files is supported in the built-in text editor.
• Initial version of Line Check module. Select a line/cable group in the circuit window (several objects allowed). Then click ATP|Line Check.
• Possible to edit node names, labels and free text directly on the screen. Select Edit|Edit label to place a free text in open space. Maximum 255 free texts with 255 characters in each. The action mode Move label changed name to Edit label.
• ATPDraw draw gives a warning when creating the node names (Run ATP, Make names) when components overlap. Completely overlapping connections are automatically deleted. After this process overlapping components can be selected as a group in Edit|Select|Overlap obj.
  
  

• The grid snap feature was wrong for some group operations causing the connections to be out of position.
• The /INITIAL card is written to the ATP file only when required. An empty such card (followed by /OUTPUT) resulted in problems in Harmonic Frequency Scan for some ATP versions. Similarly, the BLANK INITIAL card is only written when required.
• A wrong column format was written to the ATP file for frequency dependent RLC branches.
• The Line/Cable object (LCC) had an error for Cable Constant when calculating the NGRND parameter for JMarti models and enclosing pipe cables.
• The comments for LCC components are written to the ATP-file. Labels and the Hide features are also included for lines and cables.
• The Group No input for all objects have changed name to Order to become more in line with the actual meaning (criterion for ATP file sorting). Order also added to LCC objects.
• Semlyen models supported in Cable Constants.
• An overwrite file warning added.
• The Hi and Lo limits visualized in the Transfer Function dialog box.
• Lock circuit option added in View|Options. When checked objects can not be selected and connections not drawn Useful for computer exercise situations.
• Open project warning. When opening a project ATPDraw extract the content to the disk (sup, lib, alc, bct). If files with equal name but different dates are already stored on the disk, ATPDraw gives a warning message and lets the user choose which file to keep. Earlier versions gave priority to the newer of the two files. Version 3.9, on the other hand, gives priority to the files stored in the project. If the user replies YesToAll the project files will always overwrite the files on disk. This is normally fine, but the user should be aware of the situation when working on two projects simultaneously both using the same files.
• KIZILCAY F-DEPENDENT and HYSTERESIS HEVIA components added which originators both were elected as honorary members at the EEUG meeting in Graz, Dec. 2003.
• Nonlinear resistance type 91 and 92 added
• Find Node name option added. ATP|Find Node
• Grid snap problem in copied groups corrected. The problem appeared when components in sub-groups where moved. All circuits are grid snap corrected when loading.
• A serious bug identified in the zip-module that would result in 'Incompatible file format' when the number of Texts, Variables and FreeFormats exceeded 35, 116 and 123 respectively. Due to a too small buffer the circuit file (*.$$$) was not written to the project.
• It is now possible to specify up to 5 rotor coils for universal machines 1, 3, 6, and 8, when the saturation is turned off.
• 3-phase nodes of Models supported. 3-phase inputs/outputs must be decleared by indexed variables [1..3].

• A new component SATTRAFO (saturable 3-phase transformer) replaces the old GENTRAFO. This component supports all phase shifts for D and Y-couplings as well as Auto transformers and zigzag-couplings with phase shifts <-60,0> and <0,60> degrees.
• The TACS nodes have a new color code. Positive input (type 1) and output (type 0) black/red as before. Negative input (type 2) blue color. Not in use (type 3) background color. Even if the node seems to vanish for type 3 specification it is still possible to click on it.
  

• A new component TSWITCH with the RECLOSE option added Switches|Switch time controlled. The user can choose a single or a three phase switch with equal operation times for all phases.
• Transmission lines with lumped parameters (type 1,2 .. and 51, 52 ..) have got a 'length' parameter. The length is set to unity for older projects. The distributed parameter transmission lines have got a new layout with a direct, visual support of the ILINE and IPUNCH flags.
• Text labels are editable as other objects. They can be selected as a part of a group and copied (but not rotated). Holding down the Ctrl key in the selection process gives priority to the text labels.
• BCTRAN. Several BCTRAN components can now share the same data file. This allows a true support of copy/paste. In previous versions the user had to save the data file (*.bct) with a different name for each components even if they were equal.
• MODELS. A node naming problem in the INPUT section fixed. If several models were connected to a splitter and with more tham one input from the same node (for instance current and voltage) a node naming conflict appeared.
• LineCheck module. Xopt and Copt written to the ATP file. In earlier versions a node name starting with the letter 'C' was actually treated as  a comment. This resulted in an 'Unexpected file name encountered..' error message. 
• LCC verify. Two problems with lack of DOS-compatible paths corrected.
• The Auto-detect LIS-file errors and frequency scan output flags (ATP|Settings) stored in the project.

• The advanced Hybrid Transformer model added. Transformer data of leakage inductance, frequency dep. winding resistance, capacitances and topologically correct core magnetization and losses based on Design, Test report, or Typical values. Autotransformers and all Y- and D- couplings supported.
• A node naming problem in circuits where the number of (ATPDraw) nodes exceeded 10.000 corrected. Now, up to 29.999 circuit nodes with node names provided ATPDraw are allowed. The first 9999 starts with the letter 'X', then from 10.000 to 19.999 with 'Y', and finally from 20.000 to 29.999 with 'Z'. This also means that the user should avoid giving nodes names starting by these letters followed by a four digits number.

• New support and project file formats
• 64 data and 32 nodes supported for all components
• Variable names (useful for Models) and labels increased to 12 characters.
• A Unit string added to most data parameters with special support of XOPT/COPT.
• Support of up to 26-phase nodes and Model variables X[1..26].
• An extended connection can connect n-phase and single phase nodes. Dialog box added for selection of #Phases, Phase carried, color and label. Transposition will only take place through a 3-phase connection.
• Possible to click on a connection's midpoint to draw a new connection with inherted properties. Click and hold required to select a connection.
• CompileCircuit is rewritten to remove the Splitter back-to-back problem and to support the enhanced connection.
• MakeATPFile rewritten for better handling of $Parameters (also for MODELS).
• The probes are enhanced to support more than 3 phases and an (preliminary) option to read the lis-file and display steady state values is added. A Models probe added to monitor global MODELS variables.
• The node dialog changed and combo boxes added for selection of TACS node signs (the color of the connection changed), Models input types and machine control setting.
• Vector graphics introduced (this is a giant leap). A vector icon can have the size of 255x255 pixels (compared to the 41x41 for bitmaps). Combination of bitmaps and vector graphics supported and backward compatibility is ensured. An icon can consist of maximum 93 elements (lines, rectangles, ellipses, polylines, polygons, circle arcs, bezier curves and text in 256 colors in all pen and brush stiles). Multiple layers are supported that can be turned on/off dependent on user selection of data.
• The vector icons are individually scalable (select the icon and move the mouse cursor to the border).
• Flipping of icons added (left-to-right).
• Several problems related to zooming corrected.
• All standard icons are described by vectors (~200 icons!). Backward compatibility required that size and node positions were maintained.
• Dynamic changes in the icons for RLC branches, sources, a time controlled switch, transformers (coupling indiction), electrical machines, statistical/systematic switches, TACS transfer functions and devices, and LCC.
• The nodes position is described by a relative distance to the components center rather than a position on the icon border. This enables more than 12 nodes, but it can only be utilized by vector icons at the moment. Models and Groups can take advantage of this point at the moment but more work is probably required for grouping.
• Black node No name given, Red node= user name given (just the opposite as previously), (Blue node (negative TACS input) no longer supported).
• A type 1 source is added.
• Rubber-band connection gridsnap problem corrected. 
• The multiple BCTRAN transformer problem fixed.
• Recompress. Modify the interface of a group component.
• Support of up to 21 phases for the LCC components.
• The XFMR model fixed so that the core can be related to any winding. Previously the low-voltage winding had to be the inner winding. Unfortunately a sqrt(3) error was introduced for delta-couplings.

• Bugs related to the new individual data handling introduced in version 5 corrected in several steps. User Specified components and LCC (Line/Cable) with the same name are represented by the same $Include file and should consequently be forces equal in the circuit as well. This also applies to Models which are written just once to the ATP file, and consequently the definition of equal Models must be the same.
• Integrated support of MODELS. The user can directly edit the Model definition inside the Component dialog. The icon will adapt to changes. This adaption was initially too radical resulting in unnecessary destruction of the icon and node positions.
• Support of indexed data in Models on the format X[1..number]. The total number of data still limited to 64.  

• Version 5.2 was prepared for the EEUG meeting 2007. It was later on decided to skip this intermediate version. Version 5.2 was updated with a new main menu and toolbar but this upgrade is far more extensive in version 5.3.
• Upgrade to a new compiler Delphi 2007, basically to better support the new help file standard.
• Upgrade of this help file system from HLP to CHM (HTML format). The HLP format is not supported/recommended in Windows Vista and a separate program WinHelp.exe must be downloaded from Microsoft.
• The main menu and toolbar are updated to Windows XP look and feel. New icons added for both toolbar and main menu. The toolbar is costomizable. Elements are intentionally enabled and disabled.
• Support of "themed" design and real Windows XP/Vista appearance of buttons and tabs.
• Support of multi-lined text with individual font and color properties. Using the multi-line option will prevent older versions of ATPDraw to show the text correctly on screen.
• The Zoom and Node size dropdown lists are correctly defocused when the user clicks the circuit window so the mouse wheel returns to up-down scrolling.
• Alt+click to select texts, node names, or labels instead of the Ctrl key. Ctrl+P/V followed by a rapid click on the pasted component resulted in an unexpected shift to Edit Text mode.
• It is once again possible to give node names directly in the Component dialog. User specified names are drawn with a red color.
• Several corrections in the Hybrid Transformer model. Zero sequence. Core losses, saturation curve small transformers. Frequency dependent winding resistance.
• Support of Triplex core added to the Hybrid Transformer model XFMR.
• A connection's node dots can be individually forced on in order to produce a consistent drawing with all other node dots off.
• A Vector Graphic Editor available. Drawing, selection, rescaling of individual or all elements. Handling of node positions together with the icon. Support of rotated ellipses and rectangles. Support of pie shapes.
• Relations drawn as a dotted line. The relation property is available from the Connection dialog. A Relation can have a label and different colors just like a connection.
• A third page 'Nodes' added to the LCC dialog which allows the user to change the node names and assign the individual conductors to the terminals. This could be useful for more complex cable systems. 
• The LCC dialog is rewritten to give a better handling of the Name and better support of Cancel.
• Error in Copy/Paste nonlinear characteristic corrected.
• Shortcut keys Alt+F1-F12 added to the Edit Definition/Support dialog (and Vector Graphic editor) to support the "old" icon border node positions (1-12) co-ordinates.

• Vector graphic editor significantly enhanced.
• Possible to add a standard bitmap background to component icons, including scaling and rotation.
• Output Manager. ATPDraw lists all output requests and gives the user direct access to each of them. Includes also a statistical tabulation option with scaling and grouping.
• Additional cards moved to separate new component under User specified in the selection menu. Follows standard edit operations including Hide and Sort. Inclusion of request templates via the built-in text editor's context menu (right click).
• Models Record moved locally into each model component.
• All results files stored in memory (also for LCC and BCTRAN). $Include files dumpted to the result directory (user selectable ATP or project folder) each time the final ATP file is created. No more any risk of file sharing conflicts with simultaneously open projects. No initial request for ResultDir. BCTRAN result file stored in project.
• User extendable Selection menu. Add frequent used sub-circuits to the selection menu.
• Password protection of Groups, Models and User Specified components.
• Hybrid Transformer model benchmarked and corrected.
• Windsyn integration supported.

• Visual feedback in Compress: The content is redrawn in the middle of the circuit window alone. The external nodes are drawn enclosed by a red ring. When the user selects a component in the list it is drawn in a lime color on screen. This is also the case when nodes are selected in the Available list. The already external data/node of the selected component is written with a lime color in the Added to lists. When the user selects a data/node in the Available lists that already is external this is highlighted in the Added to lists. UNDO for Recompress added. When Extract is selected the group should now always be visible in the middle of the circuit window. 
• A bug in earlier versions restricted the number of groups effectively to 255 in a circuit. This was only partly fixed in version 5.4 and now for new groups (Compress). 
• A new checkbox added to the Output Manager to force a more primitive drawing of the On-buttons for statistical studies, as this might fail on some windows systems.
• Drag and drop feature for project files from Windows File Manager to ATPDraw. Drag the file to the circuit window to Import and the Header of background to Load.

• Optimization. Optimization circuit variables with Gradient Method, Genetic Algorithm, or Simplex Annealing routines. Communicates with cost function and circuit variables.
• Cost function Model|WriteMaxMin with value extraction and View option.
• New handling of $PARAMETERS (variables). Internal variable syntax ($$) that allows nesting.
• Loop control syntax under Variables (as function of simulation number). @[, @FILE, @LIN, @LOG, @EXP, @POW
• Load flow components. Steady-state in selection menu + ATP|Settings/Load flow.
• General AC source. Single/3-phase, grounded/ungrounded, rms and line voltage scaling.
• Hybrid Transformer modification. Final slope parameter of magnetization characteristics. New, faster and better optimization of core model. Core loss topology modified. Support of type 96 added.
• 24 phases in the LCC module (increase from 21)
• Zooming in the View nonlinearity dialog.
• Bug-fix in vector editor (delete multiple items).
• Two new examples added: Universal machine control, Resonance earth coil tuning. 
• New User Manual.

• Direct implementation and improvement of Windsyn machine modeling. ATPDraw does the parameter fitting internally, offering higher accuracy and user control as well. Problems with decimal points and non-updating values are gone. The new induction machine model comes with a new fitting module that gives the user control of fitting parameters, including slip and maximum torque.  It also has a plotting function for Torque/speed characteristics. The synchronous machine comes with an exciter control for voltage or reactive power. Both models also have a governor speed controller. The user can easily switch between various starting conditions. 
• GUI features. There is a new 'center circuit' button. The circuit world size can be changed in the View window. The user can add lines, arrows, rectangles, ellipses, and pictures to the circuit (Tools|Drawing). There is a brand new side bar with tree-view quick access to the Component Selection menu, as well as a Simulate page with the most important ATP settings listed.
• New components. Two new TACS sources: Constant and Models input. More important is that a new general fortran component called TFORTRAN has been added. With this the user can specify 1-9 inputs and 0-9 data and write the fortran code on the form OUT= ($I1-$I2)/$D1 etc. where $In are the inputs and $Dn are the data, automatically inserted by ATPDraw when creating the file. In this way the fortran statement becomes transparent and can be copied or grouped without loss of consistency.
• New properties of nodes and components. An n-phase node can be short circuited to a single phase node, and a component can be of type Multi-phase. A few components have this property implemented (rlc, nonlinear elements, diode, tacs source), but this will be extended in the future. The phase offset is now also generalized for multi-phase connections; a three-phase connection can be connected at a six-phase node starting at phase D.
• A new Help and Text editor. Syntax highlights are available for Models and Help files can be RTF files (1.0) with different fonts, styles, bullets and colors. 
• Hybrid transformer: A shell-form type B added. Help file updated.
• Important bug-fixes: Compress+Cancel resulted in node naming problems as reference to the (cancelled) group was not removed. In previous version node overlap and equal node naming could happen with hidden and disabled nodes. 

• Web-connection to MYSQL database at www.atpdraw.net. Possible to easily upload/download cases for sharing knowledge. Discussion forums. Requires registration of ATPDraw software.
• New Paste options for component dialog Data Grids. Not only paste raw data into fixed positions but use the Data Names for pasting similar data.
• New Synchronous machine model type 58/59 with support of up to 4 masses. User control of output and external TACS connections.
• New line-voltage 3-phase probe. Select A-B or A-C convention. 
• Branch voltage probe changes from large resistor branch voltage to true voltage difference.
• Inclusion of MODELS in groups. The UseAs name is brought out as part of the attributes of the mother object. Internal MODELS will get UseAs names with a _n postfix. Also fixes bug where thename of Models were not visible in the Compress dialog.
• Right click for rotate is removed (Shift has to be pressed), instead context popup is shown (more standard Windows behavior). Beginners have difficulties with unintentional rotate.
• Edit group dialog changed. The user must actively check 'Set Order and Hide' button for the changes to take place. A new choice 'Set data of member type' is added. The user can select a component type in the group and perform common data editing of all of them simultaneously.
• Hybrid Transformer: Extended to 4 windings with support of zigzag. Initial support of 4W, not fully tested.
• Hybrid Transformer: Enhanced fitting of frequency dependent winding resistance.
• Hybrid Transformer: Core settings options for final slope added.
• BCTRAN: Scaling of auto-transformer losses corrected. Corrected node-naming trouble (single-phase transformer conncted in 3-phase circuit).
• LCC template and section. New option 'template' added to LCC objects. When this turned on the object just holds the model but not the length. The template has to be used by a new object called LCC section (LCC_) which carries the line section length.
• Support of png-images in components. Better zooming and scaling of images. 

• Internal parser. An alternative to $PARAMETERS in ATP is added to ATPDraw based on the TbcParser component. This enables variation of all standard component data (all except those external in BCTRAN, LCC and XFMR) including those used in internal calculations and not restricted to the Param flag. To vary length of LCC lines, use the LCC_ (LCC section) component. The internal parser removes all restrictions on the special loop syntaxes; @[ ], @FILE. Logical operator differences apply.
• TACS circuit variable (EMTP_OUT) is modified. Supports universal machine (with machine number and type of variable) and multi-phase connections.
• Power system toolbox. 18 new components added mostly based on MODELS and a DFT algorithm (fundamental, harmonics, sequence, dq0, phasors, RX and power flow PQ). Voltage dependent PQ load. A special component added for output of phasor diagrams. Relay models (distance, differential, over-current) with trip-zone and trajectory plotting included. 
• Improvements in the plotting window. Better zooming and windows resizing enabled.
• Bug-fixes in the new synchronous machine component. Power control, parallel operation.

Other corrections/updates in version 6.0:

• Internal parser. Improved multiple run control to read data back in correct sequence with increased robustness. Avoiding multiple flickering pop-up DOS windows (if graphics.aux NODISK=1). Diagnosis output via the *.log file. Tool|Options/Preferences - 'Run ATP window hidden' option added. 
• Power system toolbox enhancements. New and improved DFT/FFT algorithms with SampleFreq added to all calculators. SampleFreq as low as 8*FREQ works fine in most situations. LOADPQ model substantially updated for increased robustness. Works also for 60 Hz. PQLOAD substantially updated for increased performance.
• Power System Toolbox. New components. Phasor calculators with initial conditions and variable frequency support. PLLDQ module for frequency calculations. RX calculator with zero-sequence compensator for distance relay earth faults added. Distance relay with circular (ohm and mho) zone shapes, under/over voltage and frequency relays added.
• Completely new plotting window. Better zooming and axis control. Change pen for all shapes by clicking on them.
• Text editor updates for ATP and LIS file edit. Faster TMemo component used and text editor windows shown as non-modal (can go back to circuit without closing).
• Auto-completion of 'UseAs' names for LCC_ sections and Idx for WriteMinMax components.
• Xopt/Copt test and updates with copy/paste/import. 
• Serious bug-fix in Import of circuits containing groups.
• Bug-fix in the Hybrid Transformer for zigzag windings. Xopt and Copt also set properly.
• Bug-fix in Help editor. Cancel with Search/Replace window open.
• Bug-fix with Variable in side-bar when switching between project windows. Further fix in path 2.
• run ATP hidden option in Tools|Options/Preferences
• Minor bug-fix:
  • plotting of BCTRAN characteristics had wrong 1000 scaling
  • general plotting scaling and offset (click on curve)
  • PQU_PHASOR component fixed so it only is present during steady-state
  • LF_PQ, LF_UP, LF_TQ components hidden option fixed (NB! patch 3 was incorrect)
  • /MODELS, MODELS header place in front of manually inserted User Specified|Additional models cards
  • Relay models 81, 59 and 27 fixed
  • Load flow transient continuation error due to extra BLANK card fixed
  • Open project gives warning instead of access violation if file does not exist.