and use it.
Program for induction motor data
The program motdatpr calculates the inductances and resistances
of the (well known) equivalent circuit of the induction motor from
the "name-plate" parameters. These are the nominal voltage and
power, the nominal slip, electrical efficiency, power factor and
the ratio of locked rotor current and nominal current.
The resistances and inductances can be used in
the universal
machine 3 - model of the induction motor in ATP and ATPdraw.
Download the zipped program (120 kb).
Unzip it to some directory,
and use it.
A very simple network in the ATPDraw format with
an induction motor
can be downloaded here.
(Note,
the file type must be *.adp. Some browser may try to change
the type to
something else. If that happens, change the type back)
The program has been written using Delphi 2. Source files are here
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An experimental complex calculator can be
downloaded here (269 kB)
or as a zipped file (129kB)
The calculator uses complex numbers either in polar or rectangular
form (magnitude and phase, or real and imaginary components). Input in one format
is automatically converted to the other. Result is given in both formats.
The calculator designed to calculate the k0-factor for distance relays.
The k0 factor is defined
as k0 = ( ZL0 - ZL1) / ( 3* ZL1), where ZL0 and ZL1 are the
zero and positive sequence impedances of
the transmission line to be protected.
The impedance values can be edited manually, or transferred from the program
elplek (see http://pp.kpnet.fi/ijl
)
The calculator is also able to carry out simple
mathematical operations with complex
numbers (of course).
Note, the calculator is still under development (version 0.5)
(June 16 2006)
The program has been written using Delphi 2. Source files are here
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Excel spreadsheets (74 kB) to calculate equivalents, courtesy Jorge Cardenas
Two spreadsheets (for excel or equivalent) and brief instructions are included
in the file.
The spreadsheets are independent, but can be used together.
The first one, "Equivalent calculation" calculates equivalent
impedances for
a network. These can be used for fault calculation or for studying
the Power Swing Blocking (PSB) or the Power Swing Tripping (PST), i.e.
the risk for an out of phase fault (OOP).
For more information about PSB and PST, see here.
The second one, "Delta.wye and wye-delta impedance converter"
can
be used (as the name suggests ) to convert impedances from
delta to wye, or wye to delta.
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An old flickermeter-program (17 kB) for
matlab, according to
IEC Report, Flickermeter, Publication 868, 1986
Sept 10 2005
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