Version history
0.9861 The powers of the unsymmetrical load are given as single
phase
powers.
February 13 2011.
0.986 An error in the earth fault currents of YY-transformers
corrected.
A new
parameter, the tilt angle of the top line, added to polygonal
(quadrilateral)
relays.
The
impedance sum calculator also calclates sum of impedances
of transformers
and transmission lines.
The
parameters on the unsymmetrical load can be given using
powers,
currents, and power factors.
Transformers
can be modeled as ideal transformers (zero impedance,
zero
magnetizing current)
Transformer
currents can be displayed using phasors.
February
7 2011
0.9852 Another error in copying components (relays) corrected
November
22 2010
0.985 Scenarios = different sets of parameters introduced for
the load component
November
1 2010
0.984 Voltages displayed at buses in volts or per unit.
Display of Thevenin impedance
corrected
(was in milliOhms!) September 5 2010
0.9831 An error in copying relays corrected August 1 2010
0.983 Curves added to the PGQ-relay. An error (at low voltage)
in the IEC-
calculation
corrected. Cursor lines (vertical/horizontal/none)can be selected
in the coordination
graph. Only inverse time or only definite time curves of
combined relays
can be shown temporarily. July 25 2010
0.9822 A node numbering error of 3-winding transformers corrected
(resulted
in erroneous
"common voltage" in connected relays). Nominal voltage and
alarm
limits added to buses (work in progress, ready in version 0.984.) May 21 2010
0.982 Impedances of three-winding transformers can be given
in per cent using
the transformer
base. An error in reading old files corrected May 9 2010
0.9813 Errors in per-unit parameters of three-winding transformer
corrected
February
10 2010
0.9812 Not published
0.9811 Errors in IEC- and Z120-calculations corrected January 10 2010
0.981 Relays can be in "not in use"-state. Some errors
corrected (parameters
of transmission
lines,..) December 13 2009
0.98 Several components can be in "not in use"-state
November 11 2009
0.979 The parameters of feeders can be given in different ways,
including the per-
unit notation.
October 7 2009
0.978 Added possibility to look current related relay
parameters in different modes
(in primary
amperes, secondary amperes, normalized sec. amperes of the current
transformer).
August 14 2009
0.9772 More errors in copying parameters corrected. Help of the shunt capacitor
calculator
updated (slightly) August 1 2009
0.977 A shunt capacitor calculator added. Errors in copying parameters
and
in displaying
activation times of some relays corrected.
July 19 2009
0.976 More parameters for capacitors. Color to more components.
June 16 2009
0.975 The user defined relay can read curves from an excel file of
type *.csv
(not *.xls!
) May 1 2009
0.974 Generator parameters can be entered using the per-unit notation.
Ampage limits
added to the generator. March 20 2009
0.973 Parameter groups of relays can be changed automatically, when
breakers are
opened or closed. "Number of parallel generators"-
parameter
added to generators March 9 2009.
0.9721 An error in reading the time multipliers of PGQ-relays from
old files
corrected December 19 2008
0.972 Calculator for adding impedances of tr. lines added
Time adder
and multiplier added for PGQ-relay
A (very) simple
motor starting curve added
Char.curves
of relays can be hidden
The star point
of the unsymmetrcial load can be connected to ground
December 8
2008
0.971 Damage curve for transformer added. Transformer parameters
can be entered
also in pu-form November 9 2008
0.970 Not published
0.969 Damage curve of transmission lines can be displayed.
Parameters
of transmission
lines can be entered in several ways, also using
per
unit notation. April 6 2008
0.9682 The phase shift in YD, DY, and YYD transformers can be
-30
or +30 degrees. Thevenin impedance calculated also with
transient
impedances (and without asynch.machines). The
activation
times of relays reported in increasing order of the
times
(almost). February 24 2008
0.9681 An error in the time difference calculation corrected.
February
16 2008
0.968 Hide the labels can be set separately for different component types.
The negative sequence
impedance added for the feeder-component.
The Thevenin impedance
calculated also with "normal" reactances
(previously only
with subtransient reactances) February 13 2008
0.967 A "two open lines"-fault added. Different (rotated)
positions for the
three winding transformer
and the unsymmetrical load added. Sequence
currents displayed
after an open line fault. February 7 2008
0.966 Current transformers have (optional) parameters (transformation
ratio, etc.).
The Open-Line-fault added. Peak and breaking
currents added
in the report, when IEC-fault. Parameter
windows
can be hidden. January 22 2008
0.965 Activation (tripping) times of relays displayed also after an
IEC-
short circuit
calculation. Components can be deleted with the mouse
only (right
click, and select "delete" in the pop-up menu).
Warning messages
can be displayed. August 24 2007
0.9644 "Floating label" added to the coordination graphics
(texts that
"float"
on the graph) July 15 2007
0.9643 Not published
0.9642 Some Basler PGQ (phase-ground-sequence) relays added.
The
grounding impedance-component displays also the current.
June
19 2007
0.9641 (Minor) errors in the latest additions corrected June 13 2007
0.964 More fuse curves added. Starting time in coordination graphics
can be
selected to be either
0.01s or 0.001s. Thickness and length of marker-lines
can be set. Activation
times of relays reported in increasing order. Relays
can be removed from the
coordination graphics. Max. number of curves
in coordination graphics
is 16 (was 10). June 11 2007
0.963 The difference between the activation times of two characteristic
curves at a given
current
can be calculated in the coordination graphics May
15 2007
0.9621 Errors corrected: Some relays appeared twice in the parameter
report.
The
new, 3rd and 4th definite time modules were not included in all calculations.
Labels
of char.curves in the coordination diagram.
0.962 Six parameter groups added to relays. An occasional
access violation error at
exit corrected.
April 12 2007
0.9619 Not published
0.9618 An error in the recloser relays and user defined relays corrected
(It was not
possible
to change the parameter values. The error was entered in 0.9614)
Note:
*.sld files generated with this and later versions cannot
be read with
older
versionsof the program! April 5 2007
0.9615-0.9617 Not published
0.9614 An error in the feeder component in the *.atp files corrected. More
definite
time
modules in combined relays. Shorter lines in the *.sld files.
Note:
*.sld files generated with this version cannot be read with
older
versions! March 14 2007
0.9612-0.9613 Not published
0.9611 Some test output removed February 22 2007
0.961 A three-winding YYY or YYD transformer added
but only in one
orientation, so far. February 16 2007
0.9603 An error in the earth fault calculation corrected. (It was
entered in 0.96)
A list-index-error
corrected. February 1 2007
0.9602 The circulating currents of transformers corrected once more.
(It
should be right now, I hope) January 20 2007
0.9601 An error in the title of the diagram corrected. January 18 2007
0.96 Undo - redo added. Corrected an error in the display of the circulating
currents
in the D-windings of transformers.
The zoomed diagram improved (the zooming ratio
can be selected, editing possible
in the zoomed diagram). Editing of (large) diagrams
improved. Units for results can be
selected (A or kA, etc). Number of decimals can be
selected in the report. Some fuse-curves
added. January 16 2007
0.951 An unsymmetrical load added (three different impedances in a
star).
A fault (or other
component) can be somewhere between the endpoints
of a transmission line.
Sept. 26 2006
0.95 The Thevenin sequence impedance can be calculated in all
buses and voltmeters
Winding currents in D (delta)
sides of transformers can be displayed
Possible to copy of parameters
of components using tables
The user can open/close several
breakers by reading a file
Some more breaker symbols added
Note block of distance relays
visible also without (fault) calculations
Filtering added to the "find
components" operation
Saving of the list of components
added to the "find components" operation
August 30 2006
0.94 The fault current of a fault in each bus and
each voltmeter in turn can be
calculated
by one click of a button. August 14 2006
0.9381 A bug on displaying results after an IEC-calculation corrected.
August 2 2006
0.938 The possibility to include a generating PQ-bus in a load flow
calculation
added. (PQ-bus =
both real and reactive power defined, voltage solved.)
This is done by
allowing the load-component to have a negative apparent
power. July
29 2006
0.936, 0.937 Not published.
0.935 The k0 calculator program and the differential protection calculator
program can be started
from Elplek (but all these programs must be
in the same directory).
Data can be moved from Elplek to these
programs. June
27 2006
0.932...0.934 Not published
0.931 The text "phase to neutral voltage" changed to "phase
to ground
voltage"
in some texts, and in the help file, because the program actually
calculates the phase
to ground voltages. Some components now display
also the voltage
of the neutral point. April 28 2006
0.93 Several different breaker symbols added
April 21 2006
0.92 More flexible point and line markers in the graphs
March 31 2006
0.911 Errors in the special summing transformer corrected
Feb 24 2006
0.91 A special summing current transformer added. (Can be used
to
construct a differential
relay, for example) Feb 19 2006
0.901 The alternative symbol for transmission lines corrected. Now
it should
work also in Win
98, etc (previously only in Win XP)
January 28
2006
0.90 List of open breakers added. A Voltmeter component added.
Two different symbols
are available for breakers, transmission lines
and
wires. Negative- and zero sequence voltages can be multiplied
by three. All result boxes
can be closed with one click (Click the xx
in the result box.) Relay
parameter window can be hidden.
January 21 2006
0.891 A bug in moving the identifiers in the relay graphs corrected
December 20 2005
0.89 "Find a component"-feature added. The possibility
to select (or filter)
components
for reports added. Added more buttons to format the
results-report.
December 12 2005
0.885 The access violation error of some relays corrected. November 4 2005
0.884 Some relay curves added to the existing curve families. Some
more hide/show
options to relay
graphics. November 2 2005
0.883 Not published
0.882 The "Access violation" error (when deleting current
transformers) corrected.
Currents at time
> 0 can be written to the report. Sept 30 2005
0.881 Different colors removed from the new result boxes of relays.
The
colored boxes worked
properly only in Win XP. Sept 26 2005
0.88 More show/hide options in the graphics of distance relays.
The activation
times etc. of relays are
displayed also in the result boxes. Sept. 25 2005
0.87 The induction motor can act also as a generator, by setting
a negative value
to the power parameter
P (all other parameters must be positive)
September 5 2005
0.861 The floating point bug (in distance relays) corrected. August 31 2005
0.86 The result boxes etc. of current transformers and distance
relays (but no other
components) can show the results
also for times > 0. Aug. 26 2005
0.853 The label of the text component stays enabled after moving. Aug 16 2005
0.852 The text component corrected. It shows all three lines
of text now, and
also the texts are copied,
when the component is copied. Aug. 16 2005
0.851 The values of current and time can be separated also with
the tabulator
in the file for the user
defined relay. An exported diagram displays open
switches with a yellow
background also in the *.wmf format. The quality
of the *.jpg files is slightly
better (and the files are larger). The exported
coordination graphics includes
the notes, explanations etc. also in the
*.wmf format, similarly as in
the *.bmp and *.jpg format.
0.85 A relay with user defined characteristics added June 26 2005
0.84 The single line dagram and the different graphics can be exported
also
in the jpeg-graphics-format.
May 2 2005
0.83 Recloser relays added April 28 2005
0.822 The characteristics of the electromechanical relay CDG14 corrected.
March 18 2005
0.821 The setting of the value of the time multiplier-parameter with
the
"spin wheel"
corrected in the electromechanical relays.
March 18 2005
0.82 Some electromechanical relays added. March 17 2005
0.81 Load flow with tap changers and solve net with tap changers added.
Load flow "tolerates"
a disconnected generator. Feb 12 2005
0.80 The load zone and the out of step zone added to the graph
of the distance relays.
The sequence impedances can be displayed also as
magnitude and phase. More
identifier (names) can be moved with the mouse
in the graphs. The color
of the grid can be selected in the graph of distance relays
Jan 16 2005
0.791 A bug in the line to line fault corrected. (The results were
wrong, if the
calculations were
carried out immediately after the calculation of the
Thevenin sequence
impedance.) Nov. 29 2004
0.79 The Thevenin sequence impedances calculated. The grid color of
relay
coordination graphics can be
changed. The symbol for the impedance-
component depends on the values
of R and X. The identifiers of markers
can be moved with the mouse
in the coordination graphics. The
coordination graphics can be
exported as a *.wmf file. Nov. 28 2004
0.78 New features in the graph for distance relays: Scale can
be changed.
Markers can be added.
Notes can be written. Title may be entered.
The graph can be exported
as a *.wmf file.
An occasional "access
violation"-error corrected (again).
Nov 11 2004.
0.77 A polygonal distance relay added Oct. 22 2004
0.76 The short circuit currents can be calculated according
to IEC 60909
(with some minor
limitations) Sept 30 2004
0.754 Lines of constant current or time can be drawn on the coordination
graphics page. Another
occasional access violation-error corrected
(in the coordination
graphics page) Sept 19 2004
0.753 Identifier error in voltage phasors corrected. Power can be
displayed
as magnitude + phase.
Sequence components of currents saved as a
function of time
(with other currents). Sept 9 2004
0.752 Voltages of buses can be displayed as phasors
Sept 3 2004
0.751 Symmetrical components of currents can be displayed as phasors
August 27 2004
0.75 Phasor display for currents added. An occasional access
violation error
corrected (in the coordination
graphics). The identifiers of the curves of the
coordination graphics page keep
their position when resizing the page
August 17 2004
0.742 The currents and activation times of relays are printed (and
displayed
with view | diagram)
together with the single line diagram.
June 15 2004
0.741 Diagram can be exported as a colored bitmap. Small errors in
relay
characteristics
and in coordination graphics corrected. The vertical "text"
removed in the text-component.
The texts of the text-component included
in the exported
*.bmp and *.wmf-files. The marker of prefault current and
other currents can
be hidden in the coordination graphics. June 7 2004
0.74 The combined relay and coordination graphics finished.
A text-
component added.
Buttons to hide the activation times and the
text components
added. Bus voltages and no. of components
added to the report.
May 28 2004
0.736 Some corrections and other small changes in the combined relay
and in the coordination
graphics of the test version.
May 7 2004
0.735 The scales of the time and current axes can be changed, and
other
small changes in
the coordination graphics page, and in the combined relay
of the test version.
For downloading, see above. April 26 2004
0.734 A title and a comment-box added to the coordination graphics
page
(a test version,
so far). The relay list and the comments of the
coordination
graphics can be saved. For downloading, see above.
April 16
2004
0.733 The test version of the combined relay improved and corrected.
(For downloading,
see above). April 8 2004
0.732 A combined phase-, residual-, and neq.sequence relay added to
a test version,
see above March 22 2004
0.731 Explanatory texts added to the distance relay impedance file.
Edges and center
of the visible part of the single line diagram drawn
in the zoomed-out
diagram window, in addition to the corners.
(click view|diagram)
Feb. 18. 2004
0.73 Impedances measured by distance relays can be saved to
file as a
function of time. Some
(minor?) bugs corrected. Feb. 17 2004.
0.72 Current or power displayed at current transformers. Activation
times of
relays included in the
report. Sum current transformers included in the
report. Feb 10 2004
0.711 The color of (some) components in the single line diagram can
be changed.
Right-click the
component and select the color in the menu that appears.
Feb. 6 2004
0.71 More colored components. The zoomed-out diagram can be used to
navigate in the single line
diagram. Opening and closing files (single line diagrams)
speeded up. (But the new colored
components may slow them back down)
A printing bug corrected (the
leftmost components were sometimes left out)
Feb.
3, 2004
0.7 Some components can have different colors. The
size limitation of
reports removed (Jan
23 2004)
0.692 Another bug in reporting currents corrected (Jan 20 2004)
0.691 A bug in displaying currents and powers of current transformers
corrected.
Some titles in the report
corrected (Jan 20 2004)
0.69 The parameters of components can be written to a parameter
report. "Save
currents with time"
saves also the phase angle. Current transformers display
the power through the
transformer. 3*Ineg and 3*Izero and power through
current transformers saved
also in the report. (Jan 18 2004)
0.68 The program "remembers" some button states. The
direction of current at distance
relays included in the
report. Three times negative and zero sequence currents
can be shown. The scale
of current extended in the graph, when phase currents
shown. Currents of all
phases and the sum current saved with the "Save currents
with time.." command.
(Jan 8 2004)
0.67 The user can select the period over which the currents
are calculated in the case
of a fault, 1s, 10s, or
100s. A bug in the calculation of the activation time
of inverse time relays
corrected. (Dec 21 2003)
0.661 The tap-parameter of transformers changed: if tap >
-20 and tap < 20
then tap = the change
in the secondary voltage in %, but if tap > 0.8 * Vprim,
then tap = a new
value for the primary voltage (Dec 17 2003)
0.66 Transformers: 1) ratio of zero seq. impedance and pos.seq
impedance added.
2)tap changer added 3)
minor bugs corrected (fault current in DD-transformer)
(Dec 14 2003)
0.651 A printing error corrected, errors in the help file corrected.
The short circuit
component can have different orientations
(Nov.
27 2003)
0.65 Help file updated. Some small bugs corrected (Nov 22 2003)
0.6475 Bounds for phase difference between the current and prefault
voltage
changed
from +-90 degrees to +60 and -120 degrees for the distance
relay
in the zero voltage / ground fault / old method case. (Nov 19, 2003)
0.6474 The old method for the zero voltage case of distance relays
modified
slightly in the case of ground fault. See above
0.6473 More bugs in the distance relay corrected. See above (Nov 9 2003)
0.6472 Another bug in the distance relays corrected (forward/reverse),
and some other
small changes in the experimental version. See above
(Nov 5 2003)
0.6471 Oops again! A bug in the zero voltage check of the distance
relays
corrected.
See above
(Oct
31. 2003)
0.647 A new way to check the zero voltage case in the distance relays.
The new experimental
version ..., see above (Oct 29. 2003)
0.6461 Oops! The condition for phase difference in the distance relay
was
the
wrong way around in the experimental version (Oct 20. 2003)
0.646 In the experimental version, the distance relay checks the prefault
voltage, if the
actual voltage becomes zero due to the fault (Oct 20 2003)
0.645 The Access violation error corrected in
the experimental
version. (Sept. 30 2003)
0.644 A test version with an improved Mho distance relay can be
downloaded NO MORE (Sept.29
2003)
0.643 A test version of the program with an experimental Mho distance
relay
can be downloaded
NO MORE (September 18 2003)
0.642 A test version of the program with the prototype of a Mho distance
relay
can be downloaded
NO MORE (September 12 2003)
0.641 A test version with an experimental (and unfinished) ground
distance
relay can be downloaded
NO MORE (August 16 2003)
0.64 The sequence components (+,-,0) are shown also on the main form
(in the result boxes, and near
to the current transformers).
The
format of data written to the report (real+imag, or abs.value
+phase)
depends on the position of
the " j/i " button (Aug 9 2003)
0.63 The occasional "access violation"-fault at shut-down
corrected (I hope)
The decimal point fault in the
Per Unit calculator corrected (It did not
always accept the decimal point)
An upper limit for the self-inductance
of transformers added. Equivalent
to a voltage dependent lower
limit for the "nominal primary open circuit
current"
Io. (July 15 2003)
0.62 Bus voltages added to the report. In the cases of asymmetrical
faults,
the sequence (+,-,0) currents
of current transformers and voltages
of
buses are written to the report (July 3, 2003)
0.611 A couple of resistors added to the *.atp file, in the case of
asynchronous
motors, because ATP does
not like loose ends. June 22 2003
0.61 A "connection bug" corrected. Sometimes, the program
did not see
that components
were connected. (for example, when a horizontal
current
transformer was directly connected to a vertical bus) May 31 2003
0.6 Diagram can be exported as *.atp file for the ATP transient
simulation program.
A bug in generating the EMTP (*.dat-file)
for transmission lines corrected
Smaller minimum value for zero sequence
impedance for feeders. May 20 2003
0.591 A bug in positioning out-of-screen elements corrected. (The
bug
distorted the example
file ex3.sld) May 9 2003
0.59 The "earth-fault-bug" is corrected (actually, it was
an "induction-
motor-bug) May 9 2003
0.58 special symbols on parameter names (like " etc) returned.
(they were
mysteriously removed in the
previous version)
A bug in "undelete"
corrected. (The "undelete" moved the component,
if a copy-paste action had been
carried out earlier) April 24 2003
0.57 Results displayed either as abs.value + phase, or real + imaginary
values
Value of prefault current indicated
on graph of max. current
after fault calculation (April
23 2003)
0.56 Graphs of currents of all phases (a,b,c) can be shown (press
Alt while
clicking the relay).
The zero sequence impedance
of feeders cannot be zero (after all).
It must be equal or larger than
the internal impedance. (April 10, 2003)
0.55 Larger limit for printer scaling factor
Initial messages (the about
box) can be hidden at start (March 25.2003)
0.54 A wye-termination component added. It connects the phases in
a wye (star).
A bug in generating the lines
of parallel feeders for the EMTP *.dat-file corrected
(But who simulates parallel
feeders? :-) (Feb 21, 2003)
0.53 A per-unit calculator added, to convert per-unit impedances to ohms (Jan 31, 2003)