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4hv.org :: Forums :: High Voltage
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Discharges of a thyristor controlled induction coil, spark length is about 150mm

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Physikfan
Sun Oct 09 2016, 05:47PM Print
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
The picture show discharges of a thyristor controlled induction coil, spark length is about 150 mm between tip and plate.

Funkenind2400x237

Measurements with such arrangements will follow.
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Mads Barnkob
Mon Oct 10 2016, 07:00AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Looks good, will you share the test setup and more details about the hardware used to create these sparks?
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Newton Brawn
Mon Oct 31 2016, 12:52AM
Newton Brawn Registered Member #3343 Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
so,

what is the electrical arrangement ??

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Physikfan
Tue Nov 01 2016, 04:07PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Here are pictures of the commercial device used to generate the sparks of the induction coil shown above:

P1190342400x374

P1190343400x272

P1190344400x257

Pictures of the used mid-size induction coil as well as the dimensions of the coil will follow.
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Physikfan
Thu Nov 03 2016, 03:37PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
This is the hardware used for generating the sparks above:

P1040877400x357

The dimensions of the coil are:
length 50 cm
diameter 18 cm

Measurements of the primary and secondary voltages will follow.
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Mads Barnkob
Thu Nov 03 2016, 06:45PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Seems like it is a multiply tapped transformer for different voltages that charges a capacitor which then avalanches the SCR and the SCR dishcarges the capacitor into the primary coil?

It does not seem there is any kind of control circuitry, unless that black block is something.
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Physikfan
Thu Nov 03 2016, 08:01PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Mads Barnkob

I agree completely with your assumption.
It is a very simple circuit.
I hope I can find the circuit diagram within a few days.
At the moment I try to measure the output voltage of the interrupter.
First with an ohmic load then with the primary coil as the load.
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Physikfan
Mon Nov 07 2016, 02:24PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
In the following figures, the voltages of the pulses (pulse rate is 50Hz) of the thyristor device are shown at an ohmic load of 0.5 ohm as a function of the switch positions 1 and 5.

0.5 Ohm is the resistance of the primary coil of this mid-size induction coil shown in the pictures above.

Y axis 100V/cm, measured with a Tek P6013A
X axis 200us/cm

Note the high voltages (e.g., -300V and + 100V) of the pulses and also the high currents with the ohmic load:
-600A and + 200A in switch position 5.

NEVAStufe1an05Ohm400x325

NEVAStufe5an05Ohm400x318

Measurements of the pulse voltages of the thyristor interrupter with the induction coil as a load will follow.
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Physikfan
Tue Nov 08 2016, 01:31PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
In the next two pictures, the voltages of the pulses (50 / second) of the thyristor device at the primary coil of the induction coil are shown as a function of the switch positions 1 and 5.
The primary coil of the induction coil used has 0.5 Ohm.
On the next two pictures, the tip and the plate of the induction coil are more than 20 cm apart and there are no direct sparks between them.

Y axis 100V / cm (measured with a Tek 6013A)
X axis 200us / cm


NEVAStufe1primary400x304

NEVAStufe5primary400x323

This reproducible structure of this positive wave is amazing, at the moment I have no explanation.

In the next two pictures the primary voltage is shown at the switch position 5, the plate is about 150 mm away from the tip of the induction coil and sparkovers take place:

NEVAStufe5primarydischarge1400x300
NEVAStufe5primarydischarge2400x311

These secondary sparkovers are also visible in the primary voltage profile.
The amplitude of this positive half-wave is smaller, the width of this half-wave is smaller and this half wave is strongly structured.
I will repeat these experiments at smaller distances from tip to plate to ensure that each
pulse of the thyristor device also results in a discharge, which has not been the case for the last two pictures.

Measurements of the secondary voltages of the induction coil will follow.

Please, let me know your comments.
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paris
Fri Nov 11 2016, 05:16AM
paris Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121
Mads Barnkob wrote ...

Seems like it is a multiply tapped transformer for different voltages that charges a capacitor which then avalanches the SCR and the SCR dishcarges the capacitor into the primary coil?

It does not seem there is any kind of control circuitry, unless that black block is something.


the black box looks like its a relay
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