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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.
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.
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.
Measurements of the pulse voltages of the thyristor interrupter with the induction coil as a load will follow.
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
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:
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.
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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