KR20110120428A - Compact blumlein line high voltage pulse generator using solid insulator - Google Patents

Abstract

PURPOSE: A compact blumlein line high voltage pulse generator using a solid insulator is provided to secure dielectric strength by filing the solid insulator between conductors. CONSTITUTION: In a compact blumlein line high voltage pulse generator using a solid insulator, three conductor cylinders is composed of an inner conductor(240), an intermediate conductor(242), and an outer conductor(244). A fast switch(230) is connected between the intermediate conductor and the inner conductor. A charge inductor(270) is connected between the inner conductor and the outer conductor. Insulator enclosures(280,282) is arranged in the both ends of a high voltage pulse generating apparatus. A solid insulator(250) is formed between three conductive cylinders.

Description

Compact Blumlein Line High Voltage Pulse Generator Using Solid Insulator}

The present invention relates to a high voltage pulse generator, and more particularly, to reducing the size of the coaxial bloomline line pulse power supply and improving the dielectric strength to improve the stability of the power supply.

In order to generate nanosecond (ns) class high voltage pulses, a bloom line line (Blumlein Line) pulse shaping circuit is widely used. The Bloomline line pulse shaping circuit can generate short pulses with a very high rise time of ultra high voltage, and thus is widely used as an electron beam generator, a laser generating power source, and an ultra high frequency generating power source.

1 shows the structure of a conventional Bloomline line pulse shaping circuit 100. Three coaxial conductor cylinders are used in the bloomline line pulse shaping circuit 100. The innermost center of the coaxial shaft is the central conductor 130, and the middle of the conductive cylinders are the middle conductor 140 and the outermost one. The located conductor is referred to as the outer conductor 150.

The bloomline line pulse shaping circuit is charged by applying a high voltage to the intermediate conductor 140 and switches 120 between the intermediate conductor 140 and the center conductor 130 or between the intermediate conductor 140 and the outer conductor 150. The switch 120 is energized to generate a high voltage pulse between the center conductor 130 and the outer conductor 150, and further between the center conductor and the load of the output stage in order to further shorten the rise time of the pulse. A method of installing the switch 160 is used.

While the intermediate conductor 140 is charged by the high voltage generator 110, the center conductor 130 and the outer conductor 150 should be grounded. The outer conductor 150 is directly grounded, and the center conductor ( 130 is grounded through the inductor 180 connected to the outer conductor 150. If the center conductor 130 and the outer conductor 150 are connected to ground by a general conductor, when a high voltage is applied to the center conductor 130, the high voltage is released to the outer conductor 150 along the conductor.

Therefore, the charging inductor 180 is used to prevent this. The reactance of the inductor in alternating current can be expressed as X = ωL. As the frequency of alternating current increases, the reactance increases. Therefore, the charging inductor 180 is grounded by connecting the center conductor 130 to the grounded outer conductor 150 while the intermediate conductor 140 is charged, and high while the high voltage pulse is transmitted to the center conductor 130. Reactance acts as an open circuit. In other words, it serves to ground the center conductor 130 in normal times, and when high frequency power is applied, it has the effect of being instantaneously an open circuit.

On the other hand, a high voltage generator 110 for applying a pulse high voltage to the intermediate conductor mainly uses a pulse transformer or a Marx Generator. When a voltage of several hundred kV is applied to the intermediate conductor 140 using a pulse transformer or a maxima generator, a high electric field is formed between the intermediate conductor 140 and the grounded center conductor 130 or the grounded outer conductor 150 to insulate it. Fracture may occur, in order to prevent this, a gas or liquid insulator (dielectric) 170 is filled between the conductors. Representative dielectrics include air, SF ₆ (sulfur hexafluoride) gas, water (pure water), and insulating oils.

However, these dielectrics have various disadvantages. Firstly, the size of the pulse power supply increases. The shape of the bloom line is determined by considering the dielectric constant and dielectric strength of these dielectrics. In order to generate high voltage pulses of several nanoseconds and hundreds of kV, the distance between each conductor must be increased to secure the insulation distance. It becomes bigger.

In addition, a problem of difficult management of the dielectric may occur. For example, in the case of using water (pure water), ions in the water may increase the electrical conductivity and decrease the resistivity due to the decrease in resistivity. For this reason, the pure water production unit must be used to continuously circulate the water. In the case of using the insulating oil, the gas in the oil may be generated to reduce the insulation strength, and thus the insulating oil should be replaced periodically. These cumbersome tasks make it difficult to maintain and manage high voltage pulsed power supplies.

Therefore, in the technical field to which the present invention belongs, the size of the above-mentioned pulse power supply is increased, and there is an inconvenience of the prior art, which is difficult to manage the dielectric, thereby solving this problem and developing a miniaturized pulse power supply that is easy to maintain. It can be said that it is required.

SUMMARY OF THE INVENTION The present invention has an object thereof to solve the problems described above. The high voltage pulsed power supply device has been miniaturized while securing insulation strength by filling a solid insulator (dielectric) between the conductors of the coaxial Bloomline line pulse generator. The purpose is to provide.

In order to achieve the above object, the bloom line high voltage pulse generator 200 of the present invention includes three conductor cylinders including a center conductor 240, an intermediate conductor 242, and an outer conductor 244; A high speed switch 230 connected between the intermediate conductor 242 and the center conductor 240; A charging inductor 270 connected between the center conductor 240 and the outer conductor 244; Insulator enclosures 280 and 282 located at both ends of the high voltage pulse generator; A solid insulator 250 formed to intervene between the three conductor cylinders; Insulating oil 252, which is in contact with both ends of the solid insulator 250 and filled between the high speed switch 230 and the charging inductor 270, in the insulator enclosures 280 and 282 at both ends of the high voltage pulse generator. 254); The solid insulator 250 is characterized in that the polymer solid insulator.

In addition, the polymer solid insulator is preferably characterized in that it comprises at least one material selected from the group consisting of Kapton, Mylar, polyethylene, polypropylene, Teflon.

According to another exemplary embodiment of the present invention, both ends of the solid insulator 250 contacting the insulating oils 262 and 264 are configured in a conical column shape to expose the outer conductor 244 exposed to the insulating oils 262 and 264. In addition, the insulating distance between the ends of the intermediate conductor 242 and the center conductor 240 is increased.

In addition, the cross section of the front end portion 262 in which the solid insulator 250 is in contact with the insulating oil 252 is configured to form a bend 263 to expose the outer conductor 244 and the intermediate conductor 242 exposed to the insulating oil. And increasing an insulation distance between the ends of the center conductor 240.

According to another embodiment of the present invention, the intermediate conductor 242 is a spiral formed coaxially with the center conductor 240 and the outer conductor 244 between the center conductor 240 and the outer conductor 244. It is characterized by consisting of a metal tape (243).

Bloom line high voltage pulse generator using the solid dielectric (insulator) provided by the present invention has the following advantages.

First, by using a solid insulator, not a gas or liquid, as a dielectric of the plumline line high voltage pulse generator, the size of the pulse generator can be greatly reduced while maintaining the dielectric strength.

Second, unlike the prior art in which it is difficult to manage the dielectric because additional equipment or work is required for managing the dielectric, the use of a solid insulator can significantly reduce the cost and time required for managing the dielectric.

Third, by providing a small portable bloomline line high voltage pulse shaping device, the size of the entire system of various devices using nanosecond class ultra high voltage pulses is reduced.

1 is a cross-sectional view showing the structure of a conventional bloom line line (Blumlein Line) forming circuit,
2 is a cross-sectional view showing the structure of a Bloomline Line forming circuit according to the present invention;
3 is a side view showing a charging inductor of a molded circuit according to an embodiment of the present invention,
4 is a perspective view showing an intermediate conductor composed of a helical metal tape according to another embodiment of the present invention,
5 is a cross-sectional view showing a cross section of a solid insulator end according to another embodiment of the present invention.

The present invention relates to a Bloomline line high voltage pulse generator using a solid insulator. Unlike the prior art, a solid insulator is used as a dielectric material to prevent breakdown of the pulse generator and use gas or liquid as a dielectric material for energy storage. It is a compact bloom line high voltage pulse generator that can greatly reduce the size of the pulse generator by improving the dielectric strength and using it as an energy storage medium.

Hereinafter, with reference to the accompanying Figures 2 to 5 will be described in detail a preferred embodiment of a compact bloomline line high voltage pulse generator using a solid insulator according to the present invention.

2 is a view showing a compact bloom line high voltage pulse generator 200 using a solid insulator according to an embodiment of the present invention. The bloom line high voltage pulse generator 200 may include two switches, three coaxial conductor cylinders, a charging inductor, and an insulator.

Among the three coaxial conductor cylinders, the innermost conductive cylinder is referred to as the center conductor 240, the intermediate conductive cylinder is referred to as the intermediate conductor 242, and the outermost conductive cylinder is referred to as the outer conductor 244. The intermediate conductor 242 is connected to the high voltage generator 210 through the high voltage cable 220, and a pulse transformer or a max generator may be used as the high voltage generator. The center conductor 240 and the intermediate conductor 242 are connected to the high speed switch 230, and the high speed switch 230 operates when the intermediate conductor 242 is charged to the maximum voltage (output voltage). 240) to transmit a high frequency pulse. On the other hand, the outer conductor 244 is grounded.

As a high voltage is applied to the intermediate conductor 242, a high electric field is generated between the coaxial cylindrical center conductor 240 and the intermediate conductor 242 and between the intermediate conductor 242 and the outer conductor 244. The solid insulator 250 is filled in order to store and prevent breakdown between the conductors. The solid insulator 250 used in the present invention may include solid materials having a high dielectric strength and an appropriate dielectric constant (for example, 2 to 5), and specifically Kapton, Mylar, and polyethylene. , Polypropylene, teflon and the like can be used. Embodiments of the present invention are not limited to the above-mentioned materials, and polymer solid insulators having high dielectric strength and proper dielectric constant may be used within the scope of the present invention. The solid insulator has a high dielectric strength and an appropriate dielectric constant, so that a gap between the center conductor 240 and the intermediate conductor 242 and the intermediate conductor 242 and the outer conductor 244 without causing breakdown occurs. To reduce the

A peaking switch (output switch) 260 is connected between the center conductor 240 and the load 290 of the output terminal, which serves to further shorten the rise time of the output pulse.

3 illustrates a structure of a charging inductor 270 according to an exemplary embodiment of the present invention. The charging inductor 270 surrounds the conical columnar rear surface 264 of the solid insulator in a coil shape, and one end of both ends of the inductor is connected to the center conductor 240 and the other end to the outer conductor 244. As described above, the charging inductor grounds the center conductor 240 while the intermediate conductor 242 is charged, and serves as an open circuit while the high voltage pulse is transmitted to the center conductor 240.

On the other hand, when using the solid insulator 250 according to the embodiment of the present invention, it is cumbersome and difficult to fill the entire inside of the bloomline line pulse shaping circuit with the solid insulator 250 to be processed. This may be due to the relatively complex structure of switches and charging inductors, or due to the complexity of the manufacturing process design. The solid insulator design in this manner has the problem of increasing the manufacturing cost of the pulse shaping circuit as a result.

 Therefore, in the preferred embodiment of the present invention, between the structurally simple center conductor 240 and the intermediate conductor 242, only between the intermediate conductor 242 and the outer conductor 244 with the solid insulator 250, the remaining high-speed switch ( 230, the output switch 260 and the portion having the charging inductor 270 have a configuration feature of using insulating oils 252 and 254, which are liquid materials, as a dielectric. This configuration enables a compact structure of the solid insulator 250, and of course increases the productivity of the pulse generator.

When the part with the high speed switch 230 in the bloom line linear pulse shaping circuit is referred to as the front end of the pulse shaping circuit and the part with the output switch 260 as the rear end of the pulse shaping circuit, the high voltage terminal is a solid insulator 250 As described above, the front end and the rear end of the bloomline line pulse shaping circuit may be filled with insulating oils 252 and 254 to prevent breakdown.

On the other hand, the front end portion 262 of the solid insulator in which the ends of the coaxial cylinders are exposed to the insulating oil 252, the dielectric breakdown may occur when the insulating strength is weaker than the solid insulator. Therefore, in order to increase the insulation distance between the center conductor 240 and the intermediate conductor 242, the intermediate conductor 242 and the outer conductor 244, the front end portion 262 of the solid insulator is processed diagonally. The same applies to the rear end portion 264 of the solid insulator in which the end portions of the center conductor 240 and the outer conductor 244 are exposed to the insulating oil 254. As a result, in the preferred embodiment of the present invention, the solid insulator 250 has a cylindrical shape, but both ends are formed in a conical column shape.

In a preferred embodiment of the invention, insulator enclosures 280 and 282 are located at both ends of the pulse generator. The outer side of the front end of the pulse generator is covered by an insulator enclosure 280, the insulating oil 252 is filled in the insulator enclosure 280. On the other hand, the rear end portion of the pulse generator is an outer conductor 244 extends longer than the solid insulator 250, the insulator enclosure 282 is joined along the flange (border) of the extended outer conductor cylinder end. Inside the closed space formed by the insulator enclosure 282 is also filled with the insulating oil 254, the output switch 260 is formed through the insulator enclosure 282 is connected to the load 290.

Additional arrangements can be used to make compact bloomline line high voltage pulse generators for the purposes of the present invention.

Figure 4 shows the shape of the intermediate conductor as another embodiment of the present invention. In the above-described embodiment, the intermediate conductor is constructed of a coaxial cylinder, whereas the intermediate conductor of the present embodiment is constructed using the metal tape 243. The metal tape 243 is spirally wound around the cylindrical side surface of the solid insulator surrounding the central conductor. The helical metal tape is coaxial with the center conductor 240 and the outer conductor 244, and is located between the center conductor 240 and the outer conductor 244. One end of the spiral metal tape is connected to the high voltage line 220 to receive a high voltage from the high voltage generator 210. In the spiral metal tape 243 configured as described above, the length of the metal tape becomes the actual length of the intermediate conductor. Since the metal tape 243 is wound in a spiral shape, it is possible to further reduce the length of the bloomline line while generating the same length pulse. Do.

As another embodiment of the present invention, as shown in FIG. 5, the cross section of the solid insulator in contact with the insulating oil may be formed to bend 263. Figure 5 shows a sinusoidal (Sine) form of curvature, in addition to the curvature of this invention can be applied to other forms of curvature that can be easily inferred by those skilled in the art. In this case, the insulation distance between the center conductor 240 and the intermediate conductor 242, the intermediate conductor 242, and the outer conductor 244 in contact with the insulating oil may be further increased to prevent insulation breakdown.

Referring to the operation of the compact high voltage pulse generator according to the configuration of the present invention.

When a high voltage is generated in the high voltage generator (pulse transformer or the max generator) 210, the high voltage is applied to the intermediate conductor 242 of the bloom line line pulse shaping circuit through the high voltage line 220. When the intermediate conductor 242 is charged to the maximum voltage (output voltage), the high speed switch 230 between the intermediate conductor 242 and the center conductor 240 operates. When the high speed switch 230 operates, pulses of nanoseconds to tens of nanoseconds are transmitted through the central conductor 240. At this time, the charging inductor 270 is temporarily opened to prevent the high voltage applied to the center conductor 240 from escaping to the outer conductor 244. On the other hand, the picking switch (output switch, 260) provided between the center conductor 240 and the load 290 further shortens the rise time of the output pulse.

The high voltage pulse from the output switch 260 is transmitted to the load 290 to have a desired action. Depending on the device connected to the load 290 may be used in various ways, such as an electron beam generator, a laser generating power source, ultra-high frequency generating power source.

Hereinafter, the effect of the present invention will be described through comparative data comparing a comparative example of a pulse generator using a conventional liquid and gas insulator and an embodiment of a pulse generator using a solid insulator according to the present invention.

First, the basic equations required to design a pulse shaping circuit to provide comparative data will be described. To design a bloomline pulse shaping circuit, the shape of three coaxial conductor cylinders is basically determined. First, the specification of the pulse to be obtained should be given. The width of the pulse (T = 2τ, τ: characteristic time), output voltage (V _out ), characteristic impedance (Z ₀ = 1 / 2Z _L , Z _L : load impedance) Is given as an initial condition.

The length l of a coaxial cylinder is given by the following equation depending on the dielectric material (insulation) filling between the cylinders.

Where c ₀ is the speed of light in a vacuum and ε _r represents the dielectric constant of the dielectric.

The dielectric constant and dielectric strength of materials used in the prior art and various materials used in the embodiments of the present invention are shown in Table 1 below.

Insulation permittivity Insulation strength (kV / cm) Remarks air One 30 Kapton 3.6 2750 Polymer Solid Insulator Mylar 2.5 2000 Polymer Solid Insulator Polyethylene 2.2 1770 Polymer Solid Insulator Polypropylene 2.5 3780 Polymer Solid Insulator Teflon 2.1 590 Polymer Solid Insulator Insulation oil 2.2 100-400 water 80 20 (t <10㎲)

Source: H.Bluhm. "Pulsed Power Systems", Springer (2006)

In addition, the capacitance C of the coaxial cylinder is obtained by the following equation.

Here, ε ₀ represents the dielectric constant of vacuum, and R ₁ , R ₂ , and R ₃ correspond to the radius of the center conductor, the intermediate conductor, and the outer conductor, respectively. Using Equation 2, the relative sizes (R ₃ / R ₂ , R ₂ / R ₁ ) of each conductive cylinder can be determined. However, for the sake of simplicity, the thickness of the intermediate conductor is ignored. If R ₃ or R ₁ is determined by considering the actual size of the system, the radius of the other two cylinders is calculated.

The next thing to consider now is to check that the size of the conductor cylinders determined above and that the insulation between the conductors have sufficient dielectric strength to generate the desired voltage. The maximum electric field that can occur in the coaxial cylindrical structure must be sufficiently smaller than the dielectric strength (insulation breakdown field) of the insulator in order to operate normally as a pulse molding circuit.

The dielectric breakdown field is about 30 kV / cm for air, the polymer solid insulator is hundreds of kV / cm, and for liquid dielectrics, the pulse width is several microseconds.

Where t (㎲) is the pulse width, A (cm ² ) is the area of the high-voltage applied electrode, k _± is a constant, 0.5 for insulating oil, 0.3 for positive high voltage and 0.6 for high voltage for water. Have The dielectric breakdown voltage can be obtained by multiplying the dielectric breakdown electric field by the gap interval (R ₂ -R ₁ or R ₃ -R ₂ ) between each coaxial cylinder.

On the other hand, the safety factor (safety factor) of the pulse shaping circuit can be defined by the following equation.

If the safety factor is greater than 1, since the applied voltage is less than the breakdown voltage, the insulation can be operated safely because no breakdown occurs. On the other hand, when this value is smaller than 1, insulation breakdown occurs, and thus it cannot be used as a pulse molding circuit.

Table 2 below shows the design of a bloomline line pulse shaping circuit with a pulse width of 5ns, an output voltage of 300kV, and a load impedance of 50Ω. In order to implement a compact pulse forming circuit, the radius of the outer cylinder 244 was limited to 5 cm, and the result of using air, water (pure water), and insulating oil as the insulator (dielectric) as a control, and the solid insulator as an embodiment of the present invention. The comparison data of the result using is shown. Where the dielectric constant ε ₀ of the vacuum is 8.85E-12 (F / m), the speed of light c ₀ is 3.00E + 08, the circumference π is 3.141592, and the cylindrical coffee capacitance (C) is 1E-10 (F). It was.

parameter
Comparative example Example (Solid Insulator) unit
air water
(pure) Insulation oil Kapton Mylar Poly
Ethylene Polypropylene Teflon Relative dielectric constant (εr) One 81 2.2 3.6 2.5 2.2 2.5 2.1 Speed of light in the medium (c) 3.00E8 3.33E7 2.02E8 1.58E8 1.90E8 2.02E8 1.90E8 2.07E8 m / s Cylinder structure Length of cylinder (l) 75 8.3 50.6 39.5 47.4 50.6 47.4 51.8 cm The logarithm of the radius ratio
(ln (R_o / R_i)) 0.42 3.75 0.62 0.79 0.66 0.62 0.66 0.60 Radius ratio (R_o / R_i) 1.52 42.67 1.86 2.21 1.93 1.86 1.93 1.83 3rd conductor radius (R3) 5 5 5 5 5 5 5 5 cm 2nd conductor radius (R2) 3.3 0.1 2.7 2.3 2.6 2.7 2.6 2.7 cm First conductor radius (R1) 2.2 0.003 1.5 1.0 1.3 1.5 1.3 1.5 cm Insulation safety check Of external high pressure applied electrode
Area (A_out) 1.95E3 1.34E2 1.22E3 9.02E2 1.13E3 1.22E3 1.13E3 1.26E3 cm ² Internal high pressure of the electrode
Area (A_in) 1.29E3 3.14E0 6.58E2 4.09E2 5.58E2 6.58E2 5.85E2 6.87E2 cm ² Outer to middle cylinder
Breakdown
Electric field (E_break_out)
30.0
291.8
194.9
2750.0
2000.0
1770.0
3780.0
590.0
kV / cm Inner to middle cylinder
Breakdown
Electric field (E_break_in)
30.0
424.7
207.4
2750.0
2000.0
1770.0
3780.0
590.0
kV / cm Outer to middle cylinder
Breakdown
Voltage (V_break_out)
51.2
1424.9
449.6
7517.7
4828.4
4082.4
9125.7
1338.0
kV Inner to middle cylinder
Breakdown
Voltage (V_break_in)
33.7
48.6
257.7
3407.5
2497.1
2199.2
4719.4
731.1
kV Outer to middle cylinder
Safety Factor (sf_out) 0.17 4.75 1.50 25.06 16.09 13.61 30.42 4.46 Inner to middle cylinder
Factor of Safety (sf_in) 0.1 0.2 0.9 11.4 8.3 7.3 15.7 2.4

As can be seen from the table, it is impossible to use air because the detected safety factor is about 0.1, and when water (pure water) is used as the dielectric, the shape of the cylinder becomes impractical (radius less than 1mm), making it impossible to manufacture. . In the case of insulating oil, the safety factor is 1.5 for the outside of the circuit (between the intermediate cylinder and the outer cylinder), but the safety factor for the inside (between the intermediate cylinder and the center cylinder) is 0.9, which may cause insulation problems. On the other hand, when using Kapton, Myler, polyethylene, polypropylene, and Teflon as solid insulators, the shape of the conductors can be manufactured, and the safety factor can be more than 1 inside and outside the circuit. It can be seen that it has sufficient dielectric strength.

Further, as described above, by replacing the intermediate conductor 242 of the cylindrical structure with the spiral metal tape 243, it is possible to further reduce the length of the bloomline line while generating pulses of the same length.

In the above described the present invention through specific embodiments, those skilled in the art can make modifications, changes without departing from the spirit and scope of the present invention. Therefore, what can be easily inferred by the person of the technical field to which this invention belongs from the detailed description and the Example of this invention is interpreted as belonging to the scope of the present invention.

200: bloom line high voltage pulse generator 210: high voltage generator
220: high voltage cable 230: high speed switch
240: center conductor 242: intermediate conductor
243: metal tape 244: outer conductor
250: solid insulator 252, 254: insulating oil
260: output switch 262: front end of the solid insulator
263: bending of the cross section of the solid insulator 264: rear end of the solid insulator
270: charging inductor 280, 282: insulator enclosure
290: load

Claims (6)

In the bloom line high voltage pulse generator 200,
Three conductor cylinders including a center conductor 240, an intermediate conductor 242, and an outer conductor 244;
A high speed switch 230 connected between the intermediate conductor 242 and the center conductor 240;
A charging inductor 270 connected between the center conductor 240 and the outer conductor 244;
Insulator enclosures 280 and 282 located at both ends of the high voltage pulse generator;
A solid insulator 250 formed to intervene between the three conductor cylinders;
Insulating oil 252, which is in contact with both ends of the solid insulator 250 and filled between the high speed switch 230 and the charging inductor 270, in the insulator enclosures 280 and 282 at both ends of the high voltage pulse generator. 254);
The solid insulator 250 is a bloom line high voltage pulse generator, characterized in that the polymer solid insulator.
The method according to claim 1,
The bloom line high voltage pulse generator 200 further comprises an output switch 260 connected between the center conductor 240 and the load 290.
The method according to claim 1 or 2,
The polymer solid insulator includes at least one material selected from the group consisting of Kapton, Mylar, polyethylene, polypropylene, and Teflon.
The method according to claim 3,
Both ends of the solid insulator 250 contacting the insulating oils 262 and 264 have a conical column shape, and the center conductor 240, the intermediate conductor 242, and the outer conductor exposed to the insulating oils 262 and 264. Bloom line line high voltage pulse generator, characterized in that for increasing the insulating distance between the ends of (244).
The method of claim 4,
The cross section of the front end portion 262 in which the solid insulator 250 is in contact with the insulating oil 252 is configured to form a bend 263 to expose the center conductor 240, the intermediate conductor 242, and the outer conductor exposed to the insulating oil. Bloom line line high voltage pulse generator, characterized in that for increasing the insulating distance between the ends of (244).
The method according to claim 3,
The intermediate conductor 242 is composed of a spiral metal tape 243 formed coaxially with the center conductor 240 and the outer conductor 244 between the center conductor 240 and the outer conductor 244. Bloomline line high voltage pulse generator.

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