Max. Current of Short-Circuit-Break-Switch

[Hans Peter Duesentrieb]

hello everyone,

my name is immanuel from kitrad we are running an hp-windturbine in a parque in the heart of berlin, germany.
due to german nature conservation law we need to switch off (break) the turbine from april to oktober from dusk till dawn.
this is to protect bats from the blades of the windturbine.

therefore we are planning to break the turbine on the ac-side with an automatic switch to short-circuite all three phases.
the switch will be controlled with an arduino.

to choose a switch that works well. we need to know how much the maximum current peak (while shortcircuiting the turbine) is?

does anybody know how much this short circuit-current-peak is?

with best regards
immanuel from kitrad

[Luiz Villa]

             Hello Hans,

         That is a very good question. From experience on what I've seen so far, an off-the-shelf three-phase circuit breaker for around 60A works very well. Of course, this depends on the size of your wind turbine, the wind in the region and your budget.

          I'm curious to see what others think on this subject.

              cheers

                 Luiz

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Dr. Luiz Fernando Lavado Villa
Associate Professor in Electrical Engineering at the Technological Institute of the University of Toulouse
Researcher in Smart Renewable Energy Systems for Rural Electrification at LAAS-CNRS, Toulouse
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[Hans Peter Duesentrieb]

Hello Luiz,

thank you for your message.
I measured the current with a clamp-on ammeter in different wind conditions.
The peak-current (not the rms) was 63,8 A.
And it wasn´t that windy that day.

I will keep you posted for our further investigations and results.

cheers
immanuel(-:

[Luiz Villa]

          Hey Hans,

         Thanks for your e-mail. Can you provide some more details of your experience? What is the size of your wind turbine? How much wind did you have that day? Do you have the raw data?

         I am currently in Greece working on modular power electronics for locally manufactured rural smart grids, and I would love to test some of our technology at your place.

           Keep us posted

                 Luiz

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-- 
Luiz Fernando Lavado Villa
Associate Professor (Lecturer) at the Electrical Engineering Department Technical Institute of the University of Toulouse 
Researcher on bottom-up rural electrification and modular power electronics at LAAS-CNRS 
Cell phone number : +33 6 67 58 00 63
website: http://homepages.laas.fr/lflavado/

[Hans Peter Duesentrieb]

Hello Luiz,

our windturbine is a 2.4 m, 700 W, neodym-HP-Windturbine.

the data i got so far was just from a clamp-meter with fast-peak-hold-function wich I attached while short-circuiting the windturbine in different wind conditions, but we don´t have a windmeasurement system yet.

by the end of this year we will have two measurment-systems (one open-source-monitor, one in-house-development) which will measure all possible currents and voltages.

we will still short-circuite the windturbine every night for bat-protection so we will have plenty of data on the max-short-circuit-current in all different wind-conditions.

we will make the data available via internet.

regarding the installation of your technology at our place we are always open to new things. our turbine is an educational-project open for all kind of promising installations(-:

what did you have in mind?

best regards from berlin
immanuel