JPS5846838A - Dc high voltage generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an improvement C of a DC high voltage generator.

Recently, DC high voltage generators, such as accelerating power sources for nuclear fusion devices and neutral particle injection equipment for plasma experimental equipment, have been produced with voltages in the order of several tens of volts and several lOm.

Its basic configuration is shown in Figure 1-11, and its outline will be explained. The AC power supply l (which is usually a commercial power grid or a dedicated generator) is cut off @2, and the AC power supply tSt is switched off via the thyristor 3 & and diode 3b that make up the iris suite 3.

Pressure vessel 44: AC power is sent. The rectifier M15 converts the power t to DC and supplies it to the load 6&:. The load 6 is the target area of the device: Therefore, various types can be considered. However, the details are omitted as they are not directly related to the gist of the present invention, but the present invention mainly relates to an ion source for making koji made by irradiating neutral particles. .) Emergency C: A large load is constant. The AC thyristor switch 3 regulates the DC output voltage and maintains the thread in the event of a load short circuit (by blocking the gate of the thyristor 31 in the event of a short circuit,
The system can be controlled and interrupted within 1 day. ) for C: provided.

Now, in the configuration shown in Part 1-1, the problem is protection in the event of a short-circuit accident between the AC iris switch 3 and the rectifier transformer 40. In other words, when a short-circuit accident occurs at point A, a short-circuit current flows in the AC power switch 3Yt, so the AC power switch 3b must be able to withstand the accident.If the power source impedance 7 is relatively large, The short-circuit current is small and there are few problems, but if the device is large-scale, the power source impedance 7 will be extremely small, and the capacity of the AC power supply switch 3 will be correspondingly large, making it extremely difficult to realize.
-It becomes difficult.

As a way to compensate for this drawback, it has been considered to add a transformer 8t in front of the AC transformer switch 3, as shown in FIG.

That is, 1. The addition of the transformer 8 increases the power source impedance and reduces the fault current in the event of a short circuit, and is currently widely used. However, the disadvantage of this method is that it requires one more transformer than the configuration shown in Figures 1-2.Normally, the neutral/particle injector is equipped with one plasma unit and the The number can be as many as 1d3Lnits)g2.

$2 Figure C: The system shown requires the same number of transformers 8 as the number of units.

The present invention is based on AC! Without increasing the capacity of the iristor switch, and without impairing the functions of DC voltage control and instantaneous cutoff in the event of a load short-circuit, the transformer 8 can be omitted and the 111m high voltage generation can be made more economical. Figure 183 is a single line diagram showing an example of the configuration of the present invention. The transformer that connects two phases to the 8th section of the pressure converter in the s2 diagram is omitted, and the AC thyristor switch 3
As shown in Fig. 44, the thyristor 91 is connected in an I-shape.
= shape t- is changed, and the neutral point side (Y) of the primary winding of the voltage transformer 4' is connected. Fig. 4 shows the 3-wire connection diagram 62 of No. 34. The middle point 4 of the primary winding of the rectifier transformer 4' is taken out to the outside without connecting the terminals, and each is connected to a thyristor 9 (hereinafter referred to as a delta type thyristor) connected to two Denata drag type thyristors. It is something.

This Yaristor has the fifth factor: the effect shown; it is possible to flow a three-phase electric cable in any direction, and the DC output voltage mci can be controlled by phase angle control g2. II! 1 can also be done, so from the point of view of the DC output voltage g1m, it is functional C: Ha! There is no difference from AC thyristor switch 3 in diagram J1,
Diode 3b is unnecessary.

- Considering the force, short path ◆, 1lG1 diagram and Figure 2 -
Since there is no section corresponding to the cable between the AC Irista suite 3 and the rectifier transformer 40 as shown,
As for the short-circuit current of the delta-type thyristor 9, it is sufficient to assume that the load is short-circuited from the secondary winding of the rectifier transformer 4I onwards. A short circuit on the power side from the primary winding of the rectifier transformer 4' can be protected by interrupting the interrupter 21L. The short circuit current flowing through the delta type thyristor 9 is the rectifier transformer! ! It is determined by the in and beadance of 4', and no particular disadvantage occurs even if the power source impedance is small (even if it is an infinite bus).

Above is the delta type thyristor 9 as the primary of the transformer 4'! This is the case where two wires are installed on the winding side, but the voltage is transformed as shown in Figure 6. ! It may be provided on the secondary winding side of 4I. Also, as a delta type thyristor, the thyristor shown as 9' in Figure IJ7 is connected in inverse parallel C! 3 sets of integrated type t Delta type I: A connected type may be used, or alternatively, a pressure vessel with two star connections for both the primary and secondary windings may be used.

According to the second invention described above, the voltage regulation and load of the DC output voltage WLWIL! Instant protection at the time of I11 circuit 1: In the Nyristor*aj2 used, a transformer for short-circuit current limitation, which has been used particularly in systems with small power supply impedance, can be omitted, and an economical system can be constructed. In addition, in the conventional AC thyristor switch,
: The included diode is also no longer needed.

[Brief explanation of the drawing]

1111 and FIG. 2 are single line diagrams of the conventional device, FIG. 3 is a single line diagram 11 showing an embodiment of the present invention, and FIG.
1311' is a three-wire circuit I1 diagram, the fifth factor is a diagram for explaining the actuating pipe of the present invention, and Figures 6 and 11-7rIA are connection WIA diagrams of main parts of other embodiments of the present invention. l...AC electricity III (commercial system or dedicated generator) 2
...AC interrupter 3...AC Nyristor switch 4.4', 4#...Rectifier transformer 5...Diode bridge 6...Load 7...AC battery impedance 8...Pressure device 9.9'...Delta type buoy risk (7317) Agent Patent attorney Kensuke Chika (and 1 others)
Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a DC high voltage generator consisting of an AC IL power supply, a rectifier transformer, and a diode bridge, a thyristor connected in a delta shape to the neutral point of the star-connected primary or secondary winding of the rectifier transformer. A DC high voltage generator characterized by connecting.