TWI418107B - Follow current-breaking device and arc horn device - Google Patents

Description

Dynamic current cut-off device and arc angle device

The present invention relates to a dynamic current cutoff device and an arcing horn device.

In the obstruction device, the purpose of installing the arc angle is to prevent a flashover from occurring on the chain of the obstacle due to a lightning strike, etc., and then the insulator is broken due to the flowing arc current, or the wire is blown. That is, the arc angle is used to move the arc of the arc to a place other than the wire, and at the same time, the arc is detached from the occlusion, protecting the wire and the occupant.

Then, in the occlusion device, generally, the ground side arc angle and the line side arc angle are disposed. In this case, when a flashover occurs between the ground side arc angle and the line side arc angle, the device may be melted or damaged due to a dynamic current (arc). Therefore, conventionally, as a corner device, there is a dynamic current cutoff device. As the dynamic current cutoff device, for example, an insulating cylinder is provided at the front end of the arc angle (for example, refer to Patent Document 1).

As shown in FIG. 13, the dynamic current cutoff device disclosed in Patent Document 1 is provided on the front end of an arc angle 51 which is attached to one of the arc angles 51, 52 (ground side) to which the obstruction device is attached. Insulating cylinder 53. In this case, the ground side arc angle 51 is installed via the ground side arc angle mounting tool 55 provided at the upper end of the obstructing chain 54, and the line side arc angle 52 is based on the line side arc angle provided at the lower end of the obstructing chain 54. The appliance 56 is mounted and installed. Then, when the flashover of the arc angle 51 occurs through the insulating cylinder 53 during the lightning strike, the dynamic current is cut in the insulating cylinder 53 by the injection of the high-pressure gas generated in the insulating cylinder 53 due to the arc heat. Broken.

(Patent Document 1) Japanese Patent No. 2926291

In the dynamic current interrupting device described in the above-mentioned Patent Document 1, the cutting effect can be effectively exhibited in the low current region from the reverse cutting test or the like, but a satisfactory result cannot be obtained in the large current region. Therefore, in order to increase the maximum cutting current, it is considered that the length of the cylinder of the insulating cylinder 53 is increased. However, when the length of the cylinder is increased and the length of the cutting portion is lengthened, the flashover voltage of the transient recovery voltage is changed. High tendency, but not very effective. Moreover, the insulating cylinder 53 is required to withstand the mechanical strength of the higher internal pressure rise of the cylinder. Therefore, conventionally, although the cutting performance has been improved, it is difficult to perform sufficient cutting in a large current region.

The present invention has been developed in order to solve the above-described conventional disadvantages, and an object of the invention is to provide a dynamic current cutoff device and an arc angle device which can sufficiently cut off a large current region even when the cutting performance is improved.

Therefore, the dynamic current interrupting device of the present invention includes the insulating cylindrical body 10 in which the electrode tip end portion 15 is inserted and fixed to the proximal end portion side, and is characterized in that the insulating material is formed of a polyamine resin to which water treatment is applied. Sexual cylinder 10.

The dynamic current cutoff device is subjected to an aqueous treatment, and when the insulating cylinder 10 is ablated, H (hydrogen) is released as an arc extinguishing gas to increase the arc voltage in a high temperature region. In other words, it is possible to produce more of the combustion gas component (hydrogen or carbon dioxide, etc.) of the polyamide resin due to the "extinguishing gas component" required for the cutting, and to effectively perform the cutting action in the high temperature region ( Hydrogen) to improve the cutting performance.

Further, in the dynamic current interrupting device of the present invention, the insulating cylindrical body 10 is provided with a through hole 21 having an electrode side small diameter in which the front end portion 17a of the electrode distal end portion 15 is protruded. The portion 18 and the outlet-side large-diameter portion 20 that is connected to the electrode-side small-diameter portion 18 and that is open to the front end surface 19 of the insulating cylindrical body 10.

In the above-described dynamic current interrupting device, the through-hole 21 has the large-diameter portion 20 on the outlet side, and the inner diameter of the large-diameter portion 20 on the outlet side is increased, and the current density is reduced, thereby suppressing the suppression of gas release. That is, when the inner diameter is increased, since the current density is reduced, the outlet is less likely to be occluded, and the cumulative energy of the arc in the outlet portion can be reduced. Further, the surface area of the cut portion (consisting of the through holes 21) is increased, and the arc extinguishing gas is quantized to increase the gas density. However, the pressure distribution at the time of arc generation from the electrode tip end portion 15 to the opening portion of the distal end surface 19 is the highest on the electrode portion side and decreases as it goes closer to the outlet side. Further, when the large diameter portion is formed in the cut portion formed of the hole portion, the maximum pressure can be suppressed, and when the length of the cut portion composed of the hole portion having the small diameter is formed to be short, the pressure can be suppressed. Therefore, by forming the insulating cylindrical body 10 into a segmented structure having the electrode-side small-diameter portion 18 and the outlet-side large-diameter portion 20, the pressure generated can be reduced. Further, in the case where an arc is generated, by forming the segment structure, the area of disappearance of the diameter of the cut portion becomes larger as the surface area becomes larger, but the amount of change in the cut portion becomes smaller.

Moreover, in the dynamic current interrupting device of the present invention, the water absorption rate of the insulating cylinder 10 is set to 1% or more.

In the dynamic current cutoff device described above, since the water absorption rate of the insulating cylinder 10 is set to 1% or more, more hydrogen can be released than during the melting.

Further, the dynamic current interrupting device of the present invention includes the insulating cylindrical body 10 in which the electrode tip end portion 15 is inserted and fixed to the proximal end portion side, and the insulating cylindrical body 10 is provided with a through hole 21, The through hole 21 has an electrode side small diameter portion 18 in which the front edge portion 17a of the electrode tip end portion 15 is protruded, and a small diameter portion 18 connected to the electrode side and on the front end surface 19 of the insulating cylindrical body 10. The outlet side large diameter portion 20 of the opening.

In the above-described dynamic current interrupting device, the through-hole 21 has the large-diameter portion 20 on the outlet side, and the inner diameter of the large-diameter portion 20 on the outlet side is increased, and the current density is reduced, thereby suppressing the suppression of gas release. That is, when the inner diameter is increased, since the current density is reduced, the outlet is less likely to be occluded, and the cumulative energy of the arc in the outlet portion can be reduced. Further, the surface area of the cut portion (consisting of the through holes 21) is increased, and the arc extinguishing gas is quantized to increase the gas density. However, the pressure distribution at the time of arc generation from the electrode tip end portion 15 to the opening portion of the distal end surface 19 is the highest on the electrode portion side and decreases as it goes closer to the outlet side. Further, when the large diameter portion is formed in the cut portion formed of the hole portion, the maximum pressure can be suppressed, and when the length of the cut portion composed of the hole portion having the small diameter is formed to be short, the pressure can be suppressed. Therefore, by forming the insulating cylindrical body 10 into a segmented structure having the electrode-side small-diameter portion 18 and the outlet-side large-diameter portion 20, the pressure generated can be reduced. Further, since the insulating cylinder 10 has a segmented structure, the amount of change in the cutting portion is reduced.

Furthermore, the arc angle device of the present invention is characterized by comprising the above-described dynamic current cutting device.

The dynamic current cutoff device can function as the dynamic current cutoff device.

According to the dynamic current cutoff device of the present invention, when the insulating cylinder is melted, H (hydrogen) is released as an arc extinguishing gas, and the arc voltage is increased in a high temperature region. Therefore, the cutting performance of the large current region can be improved, and the performance as a dynamic current cutoff device can be effectively exhibited. In other words, by adjusting the water absorption rate which greatly affects the cutting performance, the cutting performance can be improved, and by applying the water treatment, the water absorption rate can be easily adjusted, and manufacturing can be achieved. It's easy to make.

According to the dynamic current cutoff device of the present invention, in the dynamic current cutoff device, the arc voltage in the high temperature region can be increased by the aqueous treatment, the prevention of the release of the avoidable gas by the opening of the opening portion, and the accumulation of the arc can be performed. The cutting performance can be improved by reducing the energy and the like. Moreover, the reduction in the generated pressure can be achieved, and the destruction of the insulating cylinder can be prevented. Further, since the amount of change in the cut portion (the amount of change in the diameter of the hole) can be reduced, the number of cuts up to the cut limit hole diameter can be increased. In other words, the dynamic current cutoff device can exhibit excellent cutting performance and at the same time achieve an improvement in the breaking strength, and is a high-quality dynamic current switching device.

According to the dynamic current cutoff device of the present invention, more hydrogen can be released as an arc extinguishing gas during melting. Thereby, the superior cutting performance can be exerted.

According to the dynamic current interrupting device of the present invention, the cutting performance can be improved by suppressing the release of the avoidable gas by the opening of the opening, and by reducing the accumulated energy of the arc and improving the gas density. Further, the pressure generated can be reduced, and the insulation of the insulating cylinder can be prevented. Thereby, an improvement in the breaking strength can be achieved. Further, since the amount of change in the cut portion (the amount of change in the diameter of the hole) can be reduced, the number of cuts up to the cut limit hole diameter can be increased.

According to the dynamic current cutoff device of the present invention, since the dynamic current cutoff device is provided, the effect of the dynamic current cutoff device can be exhibited.

Next, specific embodiments of the dynamic current cutoff device and the arc angle device of the present invention will be described in detail with reference to the drawings. Fig. 1 is a cross-sectional view showing a main portion of a dynamic current interrupting device according to the present invention. The dynamic current interrupting device includes an insulating cylinder 10 which is mounted on an arc angle on a ground side and an arc angle on a line side. The ground side arc angle or the line side arc angle of the arc angle device formed. In this case, the hole portion 11 of the insulating cylindrical body 10 has the screw hole 12 on the proximal end side, the small diameter portion 13 in the intermediate portion, and the large diameter portion 14 on the distal end side. Then, in the screw hole 12, the screw portion 16 of the end portion (electrode tip end portion) 15 before the line side arc angle or the ground side arc angle is screwed. Thereby, the electrode tip end portion 15 is inserted and fixed to the proximal end side of the insulating cylindrical body 10.

In the state in which the electrode tip end portion 15 is connected, the electrode-side small-diameter portion 18 having the tip end portion 17a in the small-diameter portion 13 of the hole portion 11 is formed in the small-diameter portion 13 of the hole portion 11, and the large diameter of the hole portion 11 is formed. The portion 14 is formed as an outlet-side large-diameter portion 20 that is connected to the electrode-side small-diameter portion 18 and that is opened to the front end surface 19 of the insulating cylindrical body 10.

For the insulating cylinder 10, for example, a polyamide resin such as a monolithic mold nylon is used, and a water treatment is applied. Here, the term "aqueous treatment" refers to a treatment in which a material (in this case, the insulating cylinder 10) is placed in hot water and boiled for several days. In addition, the outer diameter dimension D is about 45 mm to 70 mm, and the length L1 of the electrode-side small-diameter portion 18 (the dimension from the front end of the electrode tip end portion 15 to the outlet-side large-diameter portion 20) is about 70 mm. The inner diameter dimension D1 of the electrode-side small-diameter portion 18 is set to about 6 mm, the length dimension L2 of the outlet-side large-diameter portion 20 is set to about 80 mm, and the inner diameter dimension D2 of the outlet-side large-diameter portion 20 is set to about 10 mm. . Moreover, the total length L of the insulating cylinder 10 is set to about 200 mm. Further, the outer diameter dimension D3 of the electrode tip end portion 15 is set to about 16 mm.

Further, Fig. 12 shows an embodiment of another dynamic current interrupting device including an insulating cylindrical body 10 having an outer diameter D of, for example, 45 mm and an inner diameter (inner diameter). D4 is a straight through hole 22 of 6 mm. In this case, the insulating cylinder 10 may be, for example, a polyamide resin (single mold nylon) or the like, and may be subjected to an aqueous treatment. That is, the cylindrical body 10 has the axial hole 24 having the screw hole 23 on the electrode portion side thereof, and the insulating cylindrical body 10 can be in the screw hole portion 16 of the electrode distal end portion 15 by screwing the screw hole 23 therein. The electrode tip end portion 15 is inserted and fixed to the proximal end side. Then, the through hole 22 opened in the front end surface 25 of the insulating cylindrical body 10 is formed. In this case, the insulating cylindrical body 10 has an outer diameter D of about 45 to 70 mm, a total length L of about 200 mm, and a length L3 of the through hole 22 (from the front end to the front end of the electrode front end portion 15). The size up to the surface 25 is set to 150 mm. Further, the outer diameter dimension D3 of the electrode tip end portion 15 is set to about 12 mm.

However, in the case of selecting the material of the above-described insulating cylinder 10, the crystal structure (the structure in which the structure in the molecule and the molecule are filled with each other is called a crystal structure, and the crystal system is regularly arranged in the same manner in a three-dimensional manner. ), heat absorption (showing the heat required to melt the material 1mg, the heat dissipation can be used to investigate the melting difficulty of the material), melting point (showing the temperature at which the solid becomes liquid), by measuring the melting point, the purity of the material can be investigated ), and water absorption rate are important physical properties. That is, in the crystal structure, when the α crystal and the γ crystal are compared, it is considered that the γ crystal is chemically unstable and is easily decomposed. Therefore, when the γ content rate is large, more material is decomposed, and the amount of the arc extinguishing gas (hydrogen or carbon dioxide, etc.) is increased, which is effective for the cutting performance. When the heat absorption is lowered, since the material is melted with less energy, the occurrence of the arc extinguishing gas increases. Therefore, the heat absorption amount is effective for the cutting performance. When the temperature near the zero point of the current decreases, the amount of heat absorption is effective for the cutting performance because one of the lower melting points continuously releases the arc extinguishing gas. When the water absorption rate becomes high and the material melts (abrasive), more H (hydrogen) is released as the arc extinguishing gas. Since the arc voltage is increased in the high temperature region, the water absorption is effective for the cutting performance. .

Therefore, in order to estimate whether or not the above four physical properties have an influence on the cutting performance, it is necessary to investigate the influence of each physical property on the cutting performance by using a "regression analysis method" or the like. In this case, the correlation between the cut-off time and the physical property values, the correlation between the arc-suppression peak voltage and the physical property values are analyzed, and the degree of the physical property cut-off time and the arc-extinguishing peak voltage is called the correlation coefficient. The value (the more the value becomes the coefficient = 1, the stronger the correlation between the cut-off time or the arc-suppression peak voltage), is quantitatively evaluated.

With respect to both the cutting time and the peak value of the arc extinguishing voltage, it can be understood that the water absorption rate is more inferior to other physical properties and has a greater influence on the cutting. That is, the cutting time and the water absorption rate are as shown in Fig. 2, and the negative correlation is exhibited with respect to the cutting time (the higher the water absorption rate, the shorter the cutting time becomes), and the arc extinguishing peak voltage and the water absorption rate are as follows. As shown in FIG. 3, a positive correlation is shown with respect to the arc-suppression peak voltage system (the higher the water absorption rate, the higher the arc-suppression peak voltage becomes), and the cutting performance of both can be improved. In addition, although the overall physical properties are lower than the water absorption rate, there are cases in which the parent group has a correlation of about 0.4 to 0.6. Of course, this will also affect the cutting performance. However, if the effects of the physical properties on the cutting performance are quantitatively evaluated, the water absorption rate is dominant, and the water absorption rate is largely affected.

Next, the cutting performance was investigated using materials which were not subjected to aqueous treatment (four materials of a to d) and materials which were subjected to water treatment (four materials of e~h). In this case, as a material of each of a to d and e to h, as shown in FIG. 12, a cylindrical body 10 made of a polyamide resin having an outer diameter of 45 mm and a pore diameter is used. 6mm straight through hole 22. In addition, as a test condition, it is a single-phase direct test, which sets the test frequency to 50 Hz, sets the test voltage to 77 kV, sets the test current to 1000 to 10000 A, and sets the DC component to zero and maximum (peak = 2). √ 2 × applied current), the energization time was set to 0.08 sec (4 Hz), the transient recovery voltage was set to peak = 143 kV, the rise rate was 0.95 kV/μs, and the arcing mode was set to 0.2 mm. As can be understood from Fig. 4, the cutting performance can be improved in terms of water content (water absorption rate of about 3%), and the cutting current target maximum value of 10 kA (no DC component) can be cut in one cycle. On the other hand, as is clear from Fig. 5, in the case where the water is not contained (water absorption rate: 0%), the cutting time of 1.5 to 2.5 cycles is required, and the effect of water absorption can be remarkably observed. Further, when the maximum value of the electron density in the vicinity of the front end of the insulating cylinder is equal to or lower than a certain value, the cutting can be performed, and as the water absorption rate increases, the electron density decreases. Further, hydrogen has a property of increasing the arc voltage, and when the water absorption rate is increased, the number of hydrogen atoms released by melting (wearing) is increased, so that it is easy to cut. Therefore, it is possible to subject the cylinder composed of the existing polyamide resin (for example, single-molded nylon) to water treatment without adjusting the physical properties (crystal structure, heat absorption, etc.) other than the water absorption rate. By containing water, it is possible to manufacture the insulating cylinder 10 excellent in cutting performance.

Therefore, even if it is shown in Fig. 1, or as shown in Fig. 12, by applying an aqueous treatment, H (hydrogen) can be released as an arc extinguishing gas when the insulating cylinder 10 is melted, and The high-temperature region increases the arc voltage, and the cutting performance of the large current region can be improved, and the performance as a dynamic current cutoff device can be effectively exhibited. That is, it is caused by the "extinguishing gas component" required for cutting, and the combustion gas component (hydrogen or carbon dioxide, etc.) of the polyamidamide resin is produced, and H (hydrogen) which can effectively cut off in the high temperature region ), in order to improve the cutting performance. Further, since the water-containing treatment is performed by immersing the material in hot water, water can be immediately contained from the surface of the material, and the higher the water absorption rate, the more the moisture permeates from the surface. Therefore, the number of times of repetition can be improved. Further, by subjecting the material (insulating cylinder 10) to the aqueous treatment, it is possible to easily produce a desired water absorption rate. In other words, in the dynamic current cutoff device, by adjusting the water absorption rate which has a large influence on the cutting performance, the cutting performance can be improved, and the water treatment can be easily adjusted by applying the water treatment. This water absorption rate can be easily manufactured.

However, the water absorption rate and the mechanical strength (tensile strength) are in the relationship shown in FIG. As can be understood from Fig. 10, the water absorption rate at 10 kA is 1.1%, and the tensile strength at that time is about 75 MPa (the breaking limit of the straight-through cutting portion). As described above, when the material is made to contain water, the combustion gas component can generate a large amount of hydrogen, but there is a fear that the mechanical strength is lowered, the cut portion is broken, or the screw portion is peeled off. Therefore, by expanding the diameter of the cutting portion and reducing the internal pressure, it is possible to prevent the cutting portion from being broken and to improve the cutting performance. In other words, by applying the water-containing treatment, even if the strength is lowered, if the hole portion of the insulating cylinder 10 is formed into a segment, the cutting portion is less likely to be broken because the pressure can be reduced. In this case, when the pressure generated by the segment cutting portion is replaced with a static load, the effect of reducing the pressure due to the expansion of the front end hole diameter can be set to about 34 MPa (the estimated segmentation is cut off). The pressure generated by the Ministry). However, as the water absorption rate of the insulating cylinder 10, in order to generate more hydrogen which is effective for cutting in a high temperature region, it is preferably 1.0% or more, particularly 2% or more, but it is not easy in this case. Consider the destruction of the cut-off.

Next, in the insulating cylinder 10 shown in Fig. 12, the pressure distribution in the cut portion (the range from the front edge portion 17a of the electrode tip end portion 15 to the opening portion of the through hole 21) becomes as shown in Fig. 6. As shown in Figure 7. This pressure distribution is the result of the analysis using the hot gas flow. That is, the pressure on the electrode portion side becomes the highest, and the closer to the opening portion (outlet), the lower the pressure. Further, when the diameter of the cut portion is set to 10 mm, the pressure can be suppressed more than the hole diameter of 6 mm. Further, when the length dimension of the cut portion is changed from 150 mm to 67 mm in a state where the hole diameter is set to 6 mm, the pressure can be suppressed in a shorter one, and when the ratio is 300 A (DC component 0), Fig. 6 shows the results of investigations on the pressure distribution at each point of the cut portion, with a hole diameter of 6 mm and a length of 150 mm, a hole diameter of 6 mm, a length of 67 mm, and a hole diameter of 10 mm and a length of 150 mm. Further, Fig. 7 shows the results of investigations on the relationship between the length of the cut portion of the electrode portion and the pressure, and the case where the hole diameter is 6 mm and the hole diameter is 10 mm. In addition, the length dimension of the cutting part means the dimension corresponding to the length dimension L3 of FIG.

Therefore, as shown in FIG. 1, the electrode portion side small diameter portion 18 and the outlet side large diameter portion 20 constitute the through hole 21, and it is preferable to suppress the internal pressure. For example, the electrode portion side small diameter portion 18 has a length dimension L1 of 6 mm and a length dimension L1 of 67 mm, and the length thereof is set to 10 mm while the inner diameter dimension D1 is set to be 10 mm. The size L2 is set to 83 mm. In other words, in the case of a condition of 300 A (DC component 0), if the cylinder having a hole diameter of 6 mm and a length of 150 mm is used, the maximum pressure is about 34.5 MPa, but if the length is shortened, the length is set. For example, when it is 67 mm, it becomes 15.1 MPa. From this, it can be understood that the pressure of about 19.4 MPa can be reduced by shortening the length of the cut portion (cut portion formed of a hole diameter of 6 mm) to 83 mm. However, on the distal end side of the electrode portion side small diameter portion 18 having a hole diameter of 6 mm, there is an outlet side large diameter portion 20 having a hole diameter of 10 mm. Therefore, it is assumed that the pressure of 19.4 MPa has been reduced, and the 4% component is added to the electrode portion by the cut portion having a hole diameter of 10 mm, and 1.1 MPa is superposed on 15.1 MPa to be about 16.2 MPa. . Therefore, the relationship between the length of the cut portion and the pressure is as shown in FIG. Further, Fig. 9 is a pressure at which the pressure at 300 A is converted to 10 kA (the maximum DC component). In addition, in FIG. 8 and FIG. 9, the segment (improved) refers to a cylindrical body having a segment structure of a small diameter portion on the electrode portion side and a large diameter portion on the outlet side in the through hole, and the so-called conventional (improved) Front) means a cylinder in which the through hole does not have a segmented through hole.

However, in the case where an arc is generated in the small-diameter tube, when a certain current density is exceeded, the small-diameter tube outlet is occluded, and the gas in the small-diameter tube is not easily released to the outside. On the other hand, when the inner diameter of the small diameter pipe is increased, since the current density can be reduced, the small diameter pipe outlet is less likely to be closed, and the accumulated energy of the arc at the outlet portion can be reduced, and the cutting can be easily performed. That is, since the pressure inside the small-diameter tube becomes higher in proportion to the current density of 1 to 2, the current density becomes smaller when the inner diameter of the small-diameter tube is increased (for example, 6 mm to 10 mm). It is about 3~1/8, and it is not easy to block the outlet part. Even at this point, it is preferable that the insulating cylinder 10 has a segment structure having the electrode-side small-diameter portion 18 and the outlet-side large-diameter portion 20.

That is, when an arc occurs, an average area of 1 ms disappears, and the cylindrical body 10 having a segment on the hole portion is larger than the cylindrical body 10 having no segment on the hole portion. This is due to the enlargement of the aperture, and the surface area exposed to the arc becomes large. Further, the surface area of the initial cut portion by the formation of the segment structure is also increased, and the amount of disappearance of the material at the time of cutting is increased, and the gas density is increased. Therefore, when E/ρ is decreased from the relationship between E (electric field) and ρ (gas density), the cutting performance can be improved. At this time, in the case of the same voltage condition, since E (electric field) is constant, if ρ (gas density) is increased, E/ρ becomes small. Therefore, by increasing the surface area, if the arc extinguishing gas is more quantified, ρ (gas density becomes higher), and the cutting performance is inevitably improved. On the other hand, the area of disappearance of the hole is formed by a segmented structure, and the surface area is increased as the surface area is increased, but the amount of change in the hole diameter is smaller than that without segmentation. Therefore, in the case where the cut-off limit aperture is assumed to be the same, the current continuing time until reaching the limit becomes longer, and the number of times of repetition increases.

Therefore, in the case where the area of the aperture disappearance near the exit is small, it is expected that the amount of change in the diameter of the electrode portion is also small, and the reverse cut can be used to suppress the pressure drop. Therefore, by forming the cut portion (through hole 21) into a segmented structure, the amount of change in the diameter of the hole can be reduced, so that the number of cuts to the cut limit hole can be improved. Further, the shape of the cut portion after the cutting operation is, for example, the relationship between the distance from the tip end of the cutting portion and the radius of the cut portion hole. In Fig. 11, the distance from the tip end of the cutting portion is the distance from the front end surface 19 of the insulating cylindrical body 10 to the front edge portion 17a of the electrode front end portion 15.

Thus, the improvement of the breaking strength can be achieved by reducing (shortening) the length of the cut portion of the small diameter portion (the portion having a diameter of 6 mm) or reducing the pressure of the pore diameter. Further, it can reduce the current density, improve the gas release environment in the cut portion, and at the same time quantify the amount of arc extinguishing gas generated, and the E/ρ becomes small. Thereby, the cutting time of 10 kA or the like can be shortened. As for the increase in the number of times of repetition, the amount of disappearance of the aperture can be improved by forming the segmentation cutting portion, and it is possible to have a plurality of (for example, five or more) cutting performances in terms of 66 to 77 kV.

In the case shown in FIG. 1, the through-hole 21 has the outlet-side large-diameter portion 20, so that the inner diameter of the outlet-side large-diameter portion 20 can be avoided, the current density is reduced, and the release of gas is suppressed. That is, when the inner diameter is increased, since the current density can be reduced, the outlet is less likely to be occluded, and the accumulated energy of the arc of the outlet portion can be reduced. Further, the surface area of the cut portion (consisting of the through hole 21) is increased, and the arc extinguishing gas is quantized to increase the gas density. Therefore, in the dynamic current cutoff device, it is possible to increase the arc voltage in the high temperature region by the water treatment, to prevent the release of the gas from being blocked by the clogging of the opening portion, and to reduce the accumulated energy of the arc. Thereby, it is possible to surely improve the cutting performance.

Moreover, the pressure distribution at the time of arc generation from the electrode tip end portion 15 to the opening portion of the distal end surface 19 is the highest on the electrode portion side and decreases as it approaches the outlet side. In general, when the large diameter portion is formed in the cut portion formed of the hole portion, the maximum pressure can be suppressed, and when the length of the cut portion composed of the hole portion having the small diameter is shortened, the pressure can be suppressed. Therefore, by forming the insulating cylindrical body 10 into a segmented structure having the electrode-side small-diameter portion 18 and the outlet-side large-diameter portion 20, the pressure generated can be reduced. Thereby, the destruction of the insulating cylinder 10 can be prevented, and the improvement of the breaking performance can be attained. Further, although the pressure generated can be reduced, a certain degree of pressure is required in order to exhibit the cutting performance.

Further, in the case where an arc is generated, by forming the segment structure, the area of disappearance of the diameter of the cut portion becomes larger as the surface area becomes larger, but the amount of change in the diameter of the cut portion becomes smaller. Therefore, the number of cuts up to the cut limit aperture can be increased. Further, since the water absorption rate of the insulating cylinder 10 is set to 1% or more, more hydrogen than that at the time of melting can be released as the arc extinguishing gas. Thereby, more excellent cutting performance can be exhibited.

By applying the water-containing treatment, the cutting performance in the large current region can be improved, and the performance as the dynamic current cutting device can be effectively exhibited, and the insulating cylinder 10 can be subjected to the aqueous treatment. At the same time, when the through-hole 21 is formed by the electrode-side small-diameter portion 18 and the outlet-side large-diameter portion 20 and forms a so-called segmented hole, it is possible to provide a 66 kV and 77 kV which can cut off 10 kA or the like more stably. Dynamic current cut-off arc angle.

The above is a description of the specific embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, the polyamide resin used as the insulating cylinder 10 is particularly preferably mono-cast nylon, but by performing aqueous treatment, since H can be released at the time of melting. (Hydrogen) As the arc extinguishing gas, it is sufficient to increase the arc voltage in a high temperature region. Therefore, other resins other than the polyamide resin or the polyamide resin may be used. In this case, the water absorption rate may be arbitrarily set according to the materials to be used, etc., and it is preferable to consider the crystal structure and the degree of crystallization of other physical properties that affect performance (in the crystalline polymer, the area to be crystallized and completely It is determined by the region not crystallized and showing the mass fraction of the crystal region, the heat absorption amount, and the melting point. In addition, in the above-described embodiment, the water-repellent treatment is performed by immersing the insulating cylinder 10 in hot water, but it may be arbitrarily selected according to the temperature of the hot water, the immersion time, or the like, or the desired water absorption rate. For example, the insulating cylinder 10 can be immersed in hot water of 80 ° C for three or four days. Further, as shown in Fig. 1, in the case where the insulating cylindrical body 10 is formed into a segmented structure, since the effect of forming the segmented structure can be obtained, it is also possible to provide a water-free processor. Further, in the insulating cylindrical body 10 of the segment structure shown in Fig. 1, the length dimension or the diameter dimension of the electrode-side small-diameter portion 18, the length dimension or the diameter dimension of the outlet-side large-diameter portion 20, and the like can be obtained. It is possible to arbitrarily set the range in which the pressure generated is reduced and the effect of the insulation of the insulating cylinder 10 is prevented.

10. . . Insulating cylinder

11. . . Hole

12. . . Screw hole on the base end side

13. . . Small diameter section in the middle

14. . . Large diameter portion on the front end side

15. . . Front end of electrode (front end of arc angle on ground side)

16. . . Screw section

17a. . . Front edge

18. . . Electrode side small diameter

19, 25. . . Front end face

20. . . Outlet side large diameter section

21, 22. . . Through hole

twenty three. . . Screw hole

twenty four. . . Axial hole

Fig. 1 is a cross-sectional view showing an embodiment of a dynamic current cutoff device of the present invention.

Figure 2 is a graph showing the correlation between the cutting time and the water absorption rate.

Figure 3 is a graph showing the correlation between the peak of arc suppression and water absorption.

Figure 4 is a graphical representation showing the cutting performance of a material subjected to aqueous treatment.

Figure 5 is a graphical representation showing the cutting performance of a material that has not been subjected to aqueous treatment.

Fig. 6 is a pressure distribution diagram of each point of the cutting portion.

Fig. 7 is a schematic diagram showing the relationship between the length of the cut portion and the pressure.

Fig. 8 is a schematic view showing the relationship between the length of the cut portion and the pressure.

Fig. 9 is a schematic diagram showing the relationship between the length of the cut portion and the pressure.

Figure 10 is a schematic diagram showing the relationship between water absorption and mechanical strength.

Fig. 11 is a schematic view showing the hole portion of the cutting portion after the cutting operation.

Fig. 12 is a cross-sectional view showing another embodiment of the dynamic current interrupting device of the present invention.

Figure 13 is a schematic view of an occlusion device equipped with a conventional arc angle device.

10. . . Insulating cylinder

11. . . Hole

12. . . Screw hole on the base end side

13. . . Small diameter section in the middle

14. . . Large diameter portion on the front end side

15. . . Front end of electrode (front end of arc angle on ground side)

16. . . Screw section

17a. . . Front edge

18. . . Electrode side small diameter

19. . . Front end face

20. . . Outlet side large diameter section

twenty one. . . Through hole

Claims (6)

A dynamic current interrupting device comprising an insulating cylindrical body (10) having a tip end portion (15) fixed to a proximal end portion thereof, wherein the insulating resin body (10) having a water-treated treatment is used to constitute the insulating material Sex cylinder (10). The dynamic current interrupting device according to claim 1, wherein the water absorption rate of the insulating cylinder (10) is 1% or more. The dynamic current interrupting device according to claim 1, wherein the insulating cylindrical body (10) is provided with a through hole (21) having an electrode front end portion (15) The distal end edge portion (17a) has an electrode-side small-diameter portion (18) that protrudes in shape, and an outlet that is connected to the electrode-side small-diameter portion (18) and that is open to the front end surface (19) of the insulating cylindrical body (10). Side large diameter section (20). The dynamic current cutoff device of claim 3, wherein the water absorption rate of the insulating cylinder (10) is 1% or more. A dynamic current interrupting device is provided with an insulating cylindrical body (10) in which an electrode tip end portion (15) is inserted and fixed to a proximal end portion side, and the insulating cylindrical body (10) is provided with a through hole. (21) The through hole (21) has an electrode side small diameter portion (18) in which the front edge portion (17a) of the electrode tip end portion (15) is protruded, and a small diameter portion connected to the electrode side (18) An exit-side large-diameter portion (20) that is opened on the front end surface (19) of the insulating cylinder (10). A arc angle device comprising the dynamic current cutoff device according to any one of the above claims.