JP5425591B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas-insulated switchgear, and more particularly, to a gas-insulated switchgear including a cylindrical device element attached so as to surround a central conductor.

  Gas-insulated switchgear is used in the field of power generation and substation. A gas insulated switchgear accommodates a switchgear, busbar, current transformer or transformer in a pressure vessel filled with an arc extinguishing gas.

  In the past, gas insulation switchgear has been downsized. As one of the miniaturization methods, the outer shape of the device is reduced by increasing the design electric field value near the gas insulation target part and reducing the insulation distance. However, if the design electric field value in the vicinity of the part to be insulated is increased, foreign matter (metal foreign matter) in the device that has been harmless until now becomes a factor of reducing insulation reliability.

  A gas insulated switchgear having a function of detoxifying internal foreign matters is disclosed in Patent Document 1.

  The gas insulated switchgear disclosed in Patent Document 1 includes a hole in a metal adapter (support member) that attaches a current transformer to a pressure vessel. Foreign matter between the current transformer and the center conductor of this gas-insulated switchgear moves to the low electric field part by falling down from the hole formed in the metal adapter or the current transformer end on the opposite side. As a result, it is rendered harmless. In this configuration, it is necessary to move in the axial direction toward the end of the current transformer in order for the foreign matter to fall to the low electric field portion. For this reason, it takes a relatively long time for the metal foreign object to be rendered harmless. This metal foreign matter may cause a decrease in the dielectric strength of the gas insulated switchgear and reduce the reliability of the gas insulated switchgear.

JP 2004-56927 A

The present invention has been made to solve the above-described problems, and foreign substances between the central conductor and the cylindrical device element that circulates it can be moved to the low electric field portion in a short time. An object is to provide a gas insulated switchgear.
Another object of the present invention is to provide a gas insulated switchgear with high insulation reliability.

The gas insulated switchgear according to the present invention is
A central conductor through which current flows;
A cylindrical device element arranged to circulate around the central conductor;
A support member provided on at least one end of the tubular device element, and supporting the tubular device element;
A container filled with an insulating gas, containing the central conductor, the tubular device element and the support member;
With
The cylindrical device element is disposed between at least one opening on a surface facing the central conductor, two or more partial elements each of which circulates around the central conductor, and the two or more partial elements, An interval holder for holding an interval between the partial elements ,
In the vicinity of the opening, the distance between the surface of the spacing member facing the central conductor and the central axis of the central conductor is the distance between the surface of the partial element facing the central conductor and the central axis of the central conductor. Greater than the distance,
It is characterized by that.

  According to the present invention, the foreign matter mixed between the central conductor and the cylindrical device element that goes around the central conductor can be moved from the opening of the cylindrical device element to a position where the electric field is small. As a result, the reliability of the gas insulated switchgear can be improved.

It is a longitudinal cross-sectional view which shows the structure of the gas insulated switchgear which concerns on Embodiment 1 of this invention. It is a cross-sectional view in the AA line of FIG. It is a figure for demonstrating the shape and formation position of opening. FIG. 3 is a partially enlarged view of FIG. 2. It is an expanded sectional view which shows the application example of the foreign material removal structure shown in FIG. (A) to (f) is a diagram showing a modified example of the opening. It is a longitudinal cross-sectional view which shows the structure of the gas insulated switchgear which concerns on Embodiment 2 of this invention. It is a cross-sectional view in the CC line of FIG. It is an expanded sectional view which shows the application example of the foreign material removal structure shown in FIG. It is a longitudinal cross-sectional view for demonstrating the modification of the foreign material removal structure which concerns on Embodiment 2. FIG. It is a cross-sectional view in the EE line of FIG. It is a longitudinal cross-sectional view which shows the structure of the gas insulated switchgear concerning Embodiment 3 of this invention. It is a cross-sectional view in the GG line of FIG. It is an expanded sectional view which shows the application example of the foreign material removal structure shown in FIG. It is a longitudinal cross-sectional view which shows the structure of the gas insulated switchgear which concerns on Embodiment 4 of this invention. It is a cross-sectional view in the II line | wire of FIG. It is an expanded sectional view which shows the application example of the foreign material removal structure shown in FIG.

(Embodiment 1)
Hereinafter, a gas insulated switchgear 101 according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a gas insulated switchgear 101 according to the first embodiment. 2 is a cross-sectional view taken along line AA in FIG. 1 corresponds to a cross-sectional view taken along line BB in FIG. In each figure, UD represents an upward direction, DD represents a downward direction (gravity direction), and HD represents a horizontal direction.

  As shown in FIGS. 1 and 2, a gas insulated switchgear 101 according to this embodiment includes a metal container 1, a central conductor 2, an insulating spacer 3, a current transformer 4, an electric field shield 5, and a switch. 29.

The metal container 1 includes a metal layer that surrounds the whole and is grounded. The inside of the metal container 1 is filled with an insulating gas 19 (for example, SF ₆ gas).
The center conductor 2 is a main circuit conductor of the gas insulated switchgear 101 and is fixed to the metal container 1 by an insulating spacer 3. The center conductor 2 is connected to the switch 29. With the switch 29 closed, a current flows through the center conductor 2.

The current transformer 4 is fixed to the metal container 1 by a fixture 30 and a support member (base) 31. The current transformer 4 circulates around the central conductor 2 and outputs a current induced by an alternating magnetic field caused by the alternating current flowing through the central conductor 2.
The current transformer 4 includes ring-shaped cores 4a, 4b, and 4c. The cores 4a, 4b, 4c are arranged side by side in the axial direction of the center conductor 2 so that each of the cores 4a, 4b, 4c goes around the center conductor 2.

  The electric field shield 5 is made of a cylindrical conductor metal, and is disposed between the center conductor 2 and the cores 4a, 4b, 4c so as to go around the center conductor 2. The electric field shield 5 is disposed to alleviate electric field concentration due to the corners and surface irregularities of the current transformer 4, and is connected to the ground potential. The electric field shield 5 is formed integrally with the support member 31 and is fixed to the metal container 1 by the support member 31.

  The electric field shield 5 defines two spaces S1 and S2. The space S <b> 1 is a region between the central conductor 2 and the electric field shield 5, and the space S <b> 2 is a space between the electric field shield 5 and the metal container 1. When a current flows through the center conductor 2 in the space S1, a large electric field is generated. On the other hand, even if a current flows through the central conductor 2 in the space S2, an electric field is hardly generated. This is because the electric field shield 5 and the metal container 1 are both grounded.

  The current transformer 4 and the electric field shield 5 constitute a cylindrical device element that circulates around the central conductor 2 and outputs a signal representing an electrical physical quantity, that is, a cylindrical sensor. In this embodiment, the signal output from the cylindrical device element is an induced current (or electromotive force due to electromagnetic induction). The central axis of the tubular device element (the central axis of the current transformer 4 and the central axis of the electric field shield 5) is substantially coincident with the central axis of the central conductor 2.

  The switch 29 is a device that opens and closes the circuit of the center conductor 2.

  In the gas insulated switchgear 101, the central conductor 2 and the central axis of the current transformer 4 that circulates the central conductor 2 are installed in a horizontal posture.

  A slit-shaped opening 6 is formed below the electric field shield 5. As shown in FIG. 3, the opening 6 is located in a region including the lowest position LP in the installed state of the electric field shield 5, and the lowest position LP of the electric field shield 5 from one end E1 to the other end E2 in the axial direction. It is formed along. Foreign matter in the high electric field space S1 between the central conductor 2 and the electric field shield 5 falls down from the opening 6 due to gravity and is guided to the low electric field space S2.

  The distance between the center conductor 2 and the electric field shield 5 is relatively small. For this reason, the electric field is high in the space S <b> 1 between the center conductor 2 and the electric field shield 5 when a current flows through the center conductor 2. Under such a high electric field, the foreign matter floats by electrostatic force due to the action of the applied electric field, and reaches the central conductor 2 having an electric field higher than the bottom of the electric field shield 5, thereby causing a decrease in dielectric strength. Further, even if the foreign matter does not reach the center conductor 2, it becomes a cause of local electric field concentration. For this reason, when an overvoltage such as a disconnect surge voltage due to the operation of a disconnector (not shown) or a lightning impulse voltage due to a lightning strike occurs, it becomes a factor that the dielectric strength decreases. The foreign material is, for example, metal dust, and is generated when the device is assembled or during operation and enters the electric field shield 5.

  4 is an enlarged cross-sectional view of a part of FIG. With reference to FIG. 4, the behavior of the foreign matter that has entered the space S1 between the central conductor 2 and the electric field shield 5 will be described. As shown by the arrow AR, the foreign substance 7 in the space S1 repeats rising and falling due to the effect of the levitation force and gravity due to electrostatic induction or electric polarization caused by the applied electric field. The foreign matter 7 eventually reaches the opening 6 and falls downward from the opening 6. In other words, the foreign material 7 falls into a recess formed by the opening 6 and the inner surface of the current transformer 4. The concave portion is a part of the space S2 and has a low electric field. Therefore, the foreign material 7 no longer floats or falls, but accumulates on the bottom of the recess (on the inner bottom surface of the current transformer 4). That is, the foreign material 7 is trapped at the bottom of the recess and rendered harmless. The electric field at the bottom of the opening 6 of the electric field shield 5 is opposed to the circumferential width W of the opening 6 shown in FIG. 4, the surface (inner surface) of the electric field shield 5 facing the central conductor 2, and the central conductor 2 of the current transformer 5. Determined by the relationship with the distance D to the surface (inner surface) to be made, and by making the relationship of width W <distance D, that is, the width W in the circumferential direction of the cylindrical device element of the opening 6 is set as the central conductor of the electric field shield 5. 2 and the distance D between the surface facing the central conductor 2 of the current transformer 4 and the electric field is greatly reduced, and the effect of capturing the foreign matter 7 is enhanced.

  As shown in FIG. 5, an adhesive layer 20 may be further provided at the inner bottom surface of the current transformer 4, more specifically, at a position facing the central conductor 2 with the opening 6 interposed therebetween. As a method for forming the adhesive layer 20, a method of applying a sheet of gel material, a method of applying an adhesive double-sided tape, or a method of applying an adhesive paint can be used. By providing the adhesive layer 20 on the inner bottom surface of the cores 4a, 4b, 4c located at the bottom of the concave shape, it is possible to capture the foreign matter 7 that has dropped more reliably. The adhesive layer 20 has a width WA in the circumferential direction larger than the width W in the circumferential direction of the opening 6 so that the foreign matter 7 that has dropped from the opening 6 can be reliably captured. It is desirable that the length is formed to be larger than the length of the opening 6 in the axial direction.

  As described above in detail, according to the gas-insulated switchgear 101 of the first embodiment, the foreign matter 7 that has entered the space S1 between the center conductor 2 and the electric field shield 5 is generated in the low electric field portion (the opening 6 and the current transformer). 4 is dropped and removed. The foreign matter is quickly removed without moving a long distance to the end of the current transformer 4, and the gas insulated switchgear 101 with high insulation reliability can be realized.

  In addition, according to the first embodiment, the distance between the center conductor 2 and the electric field shield 5 and thus the outer shape of the metal container 1 can be reduced. Accordingly, it is possible to reduce the amount of material used for each part and reduce the amount of processing. Moreover, since the volume of the metal container 1 can be made small, the usage-amount of the insulating gas 19 can be reduced by that much.

  Furthermore, the mean time between failures (MTBF) of the gas insulated switchgear 101 is increased, and the operating rate is improved. Therefore, the number of times the apparatus is opened and the inside is inspected is reduced, the number of times the insulating gas 19 is collected and refilled is reduced, and the amount of use can be reduced.

  As described above, according to the first embodiment, the environmental load can be reduced at each stage in the life cycle of the gas insulated switchgear 101.

  In the first embodiment, the example of the current transformer 4 has been described as a cylindrical device element that goes around the central conductor 2. If it is a cylindrical device element that circulates around the central conductor 2 and extracts an electrical physical quantity signal, the same effect can be obtained with the exception of the current transformer 4. For example, the tubular device element may be a transformer or a current transformer that circulates around the central conductor 2. Furthermore, the present invention is not limited to a transformer such as a current transformer or a transformer, and can be applied to other sensors such as a pressure gauge and a thermometer. A transformer outputs the voltage by the electromagnetic induction resulting from the applied magnetic field outside. The pressure gauge measures pressure, and the thermometer measures temperature. Even when such a sensor is used, the same effect as in the first embodiment can be obtained by providing the opening 6 at the lower end of the electric field shield 5.

  The shape, number, and position of the opening 6 formed in the electric field shield 5 are arbitrary.

  For example, as shown in FIGS. 6A to 6F, the openings 6 (6a to 6c) may be rectangular slits, elliptical slits, or the like. Further, it may be circular. Further, as shown in FIGS. 6B to 6F, a plurality of openings 6 (6a to 6c) may be formed. As shown in FIGS. 6B to 6F, the plurality of openings 6 (6a to 6c) are desirably arranged continuously from one end portion to the other end portion of the electric field shield 5 in the axial direction. Further, as shown in FIGS. 6C, 6E, and 6F, the shapes of the openings 6 (6a to 6c) may be different from each other. The position of the opening 6 (6a to 6c) is also arbitrary. However, at least one opening 6 (6a to 6c) is formed at or near the position including the position LP which is the lowermost end of the electric field shield 5 in the installed state, as shown in FIGS. It is desirable. It is desirable that the size of the opening 6 is larger than the assumed size of the foreign material 7.

(Embodiment 2)
FIG. 7 is a longitudinal sectional view showing the structure of the gas insulated switchgear 102 according to Embodiment 2 of the present invention. 8 is a cross-sectional view taken along the line CC of FIG. FIG. 7 corresponds to a cross-sectional view taken along line DD in FIG.

The gas insulated switchgear 102 of the present embodiment also includes a foreign matter removing mechanism.
In this embodiment, as shown in FIGS. 7 and 8, ring-shaped inter-core spacers 8 a and 8 b are installed between the cores 4 a, 4 b and 4 c of the current transformer 4. Core 4a, 4b, 4c is a partial element which comprises the current transformer 4 which is a part of cylindrical apparatus element. The inter-core spacers 8a and 8b are interval holders that maintain the interval between the cores 4a, 4b, and 4c. The intervals between the cores 4a, 4b, and 4c may be equal to each other or different from each other.

  The inner diameters of the inter-core spacers 8a and 8b are larger than the inner diameters of the cores 4a, 4b and 4c. For this reason, the cores 4a and 4b and the inter-core spacer 8a, and the cores 4b and 4c and the inter-core spacer 8b form recesses, respectively. That is, in the vicinity of the lower end portion of the current transformer 4, the surface (inner surface) facing the central conductor 2 of the inter-core spacers 8 a and 8 b is located below the inner surface of the current transformer 4.

  Between the cores 4 a, 4 b, 4 c and the central conductor 2, a cylindrical electric field shield 9 is arranged for alleviating electric field concentration due to the corners and surface irregularities of the current transformer 4. The current transformer 4 is fixed to the outside of the electric field shield 9 with a fixture 30. The electric field shield 9 is fixed to the metal container 1 by the support member 31. Foreign matter dropping / removing openings 10a and 10b are formed at portions of the lower end portion of the electric field shield 9 facing the inter-core spacers 8a and 8b. The electric field shield 9 is connected to the ground potential. The axial lengths of the openings 10a and 10b are preferably smaller than the size of the recesses (the widths of the inter-core spacers 8a and 8b (the axial length)). Other configurations are the same as those of the first embodiment. The current transformer 4, the inter-core spacers 8 a and 8 b, and the electric field shield 9 constitute a cylindrical device element that goes around the central conductor 2 and extracts an electrical physical quantity signal.

  As in the first embodiment, the foreign matter that has entered the space S1 between the central conductor 2 and the electric field shield 9 repeats rising and falling due to the effect of the levitation force and gravity caused by the generated electric field, and eventually opens 10a or 10b. And drops into the recess formed by the openings 10a, 10b, the current transformer 4, and the inter-core spacers 8a, 8b. In the space S2, the electric field is lowered by the electric field shield 9, and the electric field in the concave portion is also small, so that the fallen foreign matter is captured at that position.

  As shown in FIG. 9, an adhesive layer 20 may be provided at the lower end of the inner surface of the inter-core spacers 8 a and 8 b, that is, at a position facing the central conductor 2 with the openings 10 a and 10 b interposed therebetween. By providing the adhesive layer 20 on the top surfaces of the inter-core spacers 8a and 8b located at the bottom of the concave shape, it is possible to capture the fallen foreign matter more reliably. At this time, the adhesive layer 20 may be provided individually in the openings 10a and 10b, or one adhesive layer 20 having a size facing both the openings 10a and 10b may be disposed. As the method for forming the adhesive layer 20, as described above, a method of applying a sheet of gel material, a method of applying an adhesive double-sided tape, or a method of applying an adhesive paint is used. be able to.

  In the second embodiment, the ring-shaped inter-core spacers 8a and 8b having an inner diameter larger than the inner diameter of the current transformer 4 have been described. The present invention is not limited to this. If the recess is formed under the openings 10a and 10b, the shape of the inter-core spacers 8a and 8b is arbitrary. For example, as shown in FIGS. 10 and 11, the radius R1 of the upper end of the inter-core spacers 8a and 8b is made the same as the radius R1 of the current transformer 4, and the radius R2 of the lower end of the inter-core spacers 8a and 8b is Even if it is formed larger than the radius R1 of the current transformer 4, the same foreign matter removing effect can be obtained.

  10 is a longitudinal sectional view of the gas-insulated switchgear 102, and FIG. 11 is a transverse sectional view taken along line EE in FIG. 10 corresponds to a cross section taken along line FF in FIG. In this example, the openings 10 a and 10 b are connected to form one opening 10.

  As described above, according to the gas insulated switchgear 102 of the second embodiment, the foreign matter mixed between the central conductor 2 and the electric field shield 9 falls to the low electric field portion and is removed. The foreign matter is quickly removed without moving a long distance to the end of the current transformer 4. For this reason, the gas insulation switchgear 102 with high insulation reliability is realizable. Furthermore, since the concave shapes of the openings 10a and 10b can be deepened by the inter-core spacers 8a and 8b, the foreign matter capturing effect is high. The effect of reducing the environmental load at each stage in the life cycle of the gas insulated switchgear 102 is equal to or greater than that of the first embodiment.

  The present invention is not limited to the configurations of FIGS. 7 to 11, and the surface of the inter-core spacers 8 a and 8 b facing the central conductor 2 and the central axis of the central conductor 2 at least in the vicinity of the openings 10 a, 10 b and 10. A similar effect can be obtained by configuring the distance between the core 4a, 4b, and 4c to be larger than the distance R1 between the surface of the cores 4a, 4b, and 4c facing the central conductor 2 and the central axis of the central conductor 2.

(Embodiment 3)
FIG. 12 is a longitudinal sectional view showing the structure of the gas insulated switchgear 103 according to Embodiment 3 of the present invention. 13 is a cross-sectional view taken along line GG in FIG. 12 corresponds to a cross-sectional view taken along the line HH in FIG.

  In this embodiment, as shown in FIGS. 12 and 13, ring-shaped inter-core spacers 11 a and 11 b are disposed between the cores 4 a, 4 b and 4 c of the current transformer 4. Openings 14a and 14b are formed at the lower ends of the inter-core spacers 11a and 11b. Core 4a, 4b, 4c is a partial element which comprises the current transformer 4 which is a part of cylindrical apparatus element. The inter-core spacers 11a and 11b are interval holders that maintain an interval between the cores 4a, 4b, and 4c.

  Between the cores 4 a, 4 b, 4 c and the central conductor 2, a cylindrical electric field shield 12 is arranged for alleviating electric field concentration caused by the corners and surface irregularities of the current transformer 4. The current transformer 4 is fixed to the outside of the electric field shield 12 by a fixture 30. The electric field shield 12 is fixed to the metal container 1 by the support member 31. Foreign matter dropping / removing openings 13a and 13b are formed at portions of the lower end portion of the electric field shield 12 facing (overlapping) the openings 14a and 14b of the inter-core spacer. The circumferential width W2 of the openings 14a and 14b is preferably larger than the circumferential width W of the openings 13a and 13b. Similarly, it is desirable that the axial lengths of the openings 14a and 14b are larger than the axial lengths of the openings 13a and 13b. The electric field shield 12 is connected to the ground potential. Other configurations are the same as those of the first embodiment. The current transformer 4, the inter-core spacers 11 a and 11 b, and the electric field shield 12 constitute a cylindrical device element that goes around the central conductor 2 and extracts an electrical physical quantity signal.

  As in the first embodiment, the foreign matter that has entered the space S1 between the electric field shield 12 and the central conductor 2 repeatedly floats and falls due to the levitating force and gravity caused by the applied electric field, and eventually reaches the opening 13a or 13b. , Fall by gravity. Since the openings 14a and 14b of the inter-core spacers 11a and 11b are below the openings 13a and 13b, the foreign matter falls to the bottom of the metal container 1. The bottom of the metal container 1 where the foreign material falls is in the space S2, and the electric field is weak because both the electric field shield 12 and the metal container 1 are grounded. As a result, the fallen foreign matter does not float from the electrostatic force and stays at that position and is rendered harmless.

  As shown in FIG. 14, an adhesive layer 20 may be provided at the bottom of the metal container 1, that is, at a position facing the central conductor 2 across the openings 13 a and 13 b. By providing the adhesive layer 20 on the surface of the metal container 1 located at the bottom of the concave shape, it is possible to capture the fallen foreign matter more reliably. Further, the openings 13a and 13b may be connected to form one opening. As the method for forming the adhesive layer 20, as described above, a method of applying a sheet of gel material, a method of applying an adhesive double-sided tape, or a method of applying an adhesive paint is used. be able to.

  As described above, according to the third embodiment, the foreign matter that has entered between the central conductor 2 and the electric field shield 12 falls from the openings 13a and 13b to the low electric field portion in the metal container 1 and is removed. The foreign matter is quickly removed without moving a long distance to the end of the current transformer 4. For this reason, the gas insulation switchgear 103 with high insulation reliability is realizable. Further, by providing the openings 14a and 14b in the inter-core spacers 11a and 11b, the concave bottom surfaces of the openings 13a and 13b can be deepened to the inner surface of the metal container 1, so that the foreign matter capturing effect is high. The effect of reducing the environmental load at each stage in the life cycle of the gas-insulated switchgear 103 is equal to or greater than that of the first embodiment.

(Embodiment 4)
FIG. 15 is a longitudinal sectional view of a gas insulated switchgear 104 according to Embodiment 4 of the present invention. 16 is a cross-sectional view taken along the line II of FIG. FIG. 15 corresponds to a cross-sectional view taken along line JJ in FIG.

  In the present embodiment, as shown in FIG. 15, inter-core spacers 15 a and 15 b are disposed between the cores 4 a, 4 b and 4 c of the current transformer 4. As shown in FIG. 16, the inter-core spacer 15a is composed of a plurality of members 21 to 28 arranged in the circumferential direction. The members 21 to 28 are arranged while providing a gap. A gap 18a between the member 21 and the member 28 of the inter-core spacer 15a corresponds to the opening 14a of the third embodiment. Similarly to the inter-core spacer 15a, the inter-core spacer 15b is composed of a plurality of members, and is disposed with a gap 18b corresponding to the opening 14b of the third embodiment. Note that the interval between the members 21 to 28 may be constant or different.

  Between the cores 4 a, 4 b, 4 c and the central conductor 2, a cylindrical electric field shield 16 is arranged for alleviating electric field concentration due to the corners and surface irregularities of the current transformer 4. The current transformer 4 is fixed to the outside of the electric field shield 16 by a fixture 30. The electric field shield 16 is fixed to the metal container 1 by the support member 31. Foreign material dropping / removing openings 17a and 17b are provided at portions of the lower end portion of the electric field shield 16 facing the gaps 18a and 18b between the inter-core spacers 15a and 15b. The electric field shield 16 is connected to the ground potential. Other configurations are the same as those of the first embodiment.

  Core 4a, 4b, 4c is a partial element which comprises the current transformer 4 which is a part of cylindrical apparatus element. The inter-core spacers 15a and 15b are interval holders that maintain an interval between the cores 4a, 4b, and 4c. The current transformer 4, the inter-core spacers 15 a and 15 b, and the electric field shield 16 constitute a cylindrical device element that goes around the central conductor 2 and extracts an electrical physical quantity signal.

  As in the first embodiment, the foreign matter in the space S1 between the electric field shield 16 and the central conductor 2 repeatedly floats and falls due to the levitating force and gravity caused by the applied electric field, eventually reaches the opening 17a or 17b, It falls by. A gap 18a of the inter-core spacer 15a or a gap 18b of the inter-core spacer 15b is formed at the bottom of the openings 17a and 17b. For this reason, the foreign matter falls to the bottom of the metal container 1. The bottom of the metal container 1 where the foreign matter falls is located in the space S2, and is located between the electric field shield 16 that is the ground potential and the metal container 1 that is the ground potential, so the electric field is weak. As a result, the fallen foreign matter does not float from the electrostatic force and stays at that position and is rendered harmless.

  As shown in FIG. 17, an adhesive layer 20 may be provided on the bottom of the metal container 1, that is, on the surface facing the center conductor 2 with the openings 17 a and 17 b interposed therebetween. By providing the adhesive layer 20 on the surface of the metal container 1 located at the bottom of the recess, it is possible to capture the fallen foreign matter more reliably. Further, the openings 17a and 17b may be connected to form one opening. As the method for forming the adhesive layer 20, as described above, a method of applying a sheet of gel material, a method of applying an adhesive double-sided tape, or a method of applying an adhesive paint is used. be able to.

  As described above, according to the gas-insulated switchgear 104 of the fourth embodiment, the foreign matter mixed between the center conductor 2 and the electric field shield 16 enters the low electric field portion in the metal container 1 from the openings 17a and 17b. Drop and be removed. Since the foreign matter is quickly removed without moving a long distance to the end of the current transformer 4, the gas insulated switchgear 104 with high insulation reliability can be realized. Further, by forming the gaps 18a and 18b in the inter-core spacers 15a and 15b, the concave bottom surfaces of the openings 17a and 17b can be deepened to the inner surface of the metal container 1, so that the foreign matter capturing effect is high. The effect of reducing the environmental load at each stage in the life cycle of the gas insulated switchgear 104 is equal to or greater than that of the first embodiment.

  In the said embodiment, the various form was shown about the opening formed in the surface facing the center conductor 2 of the lower part of the cylindrical apparatus element which circulates the center conductor 2. As shown in FIG. The present invention is not limited to the above-described embodiment, and the shape and size of the opening and the opening are arbitrary as long as the foreign matter between the center conductor 2 and the cylindrical device element can be moved to the low electric field portion.

In addition, the configuration of the gas insulated switchgear can be arbitrarily changed. Although one phase of the gas insulated switchgear has been described in the above embodiment, the gas insulated switchgear may be a single-phase type or a three-phase collective type. Further, the type of insulating gas sealed in the metal container 1 may be SF ₆ gas, or may be an alternative gas having insulating properties and arc extinguishing properties such as carbon dioxide, nitrogen, or a mixed gas thereof.

  The shape and mounting position of the center conductor 2 can be arbitrarily changed. Moreover, the structure inside the metal container 1 can be arbitrarily changed. The present invention can be applied if the center axis of the cylindrical device element that circulates around the central conductor 2 is installed substantially horizontally and an opening can be formed on the surface of the lower side of the cylindrical device element on the central conductor 2 side. It is. In addition, the switchgear connected to the center conductor 2 can be arbitrarily configured.

  Moreover, the material and structure of the fixture 30 and the support member 31 which fix a cylindrical apparatus element to the metal container 1 are arbitrary. For example, in the said embodiment, the supporting member 31 is provided in the one end part of the axial direction of cylindrical apparatus elements (current transformer 4 and electric field shield 5 grade | etc.,), And supports a cylindrical apparatus element. However, the present invention is not limited to this, and both ends of the cylindrical device element in the axial direction may be supported by the support members 31. Further, the electrolytic shield 5 and the support member 31 may be separated. Moreover, you may form the opening for a foreign material removal not only in a cylindrical apparatus element but in the support member 31. FIG.

  In addition, the members constituting the cylindrical device elements such as the current transformer 4 and the electric field shield 5 do not need to completely circulate (circulate) the central conductor 2 but only partially (partially) circulate. You may have.

  The present invention is suitable for a gas-insulated switchgear including a tubular device element arranged so as to go around a central conductor.

1 Metal container (conductive container)
2 Center conductor
3 Insulating spacer
4 Current transformer (tubular device element; sensor)
4a, 4b, 4c Core (partial element)
5 Electric field shield (tubular equipment element)
6, 6a, 6b, 6c Opening
7 Foreign matter
8a, 8b Inter-core spacer (interval holder)
9 Electric field shield (tubular equipment element)
10a, 10b opening
11a, 11b Inter-core spacer (interval holder)
12 Electric field shield (tubular equipment element)
13a, 13b opening
14a, 14b opening
15a, 15b Inter-core spacer (interval holder)
16 Electric field shield (tubular equipment element)
17a, 17b opening
18a, 18b gap
19 Insulating gas
20 Adhesive layers 21, 22, 23, 24, 25, 26, 27, 28
29 Switch
30 Fixing tool
31 Support member 101,102,103,104 Gas insulated switchgear
S1 Space between center conductor and electric field shield
S2 Space between electric field shield and metal container

Claims (16)

A central conductor through which current flows;
A cylindrical device element arranged to circulate around the central conductor;
A support member provided on at least one end of the tubular device element, and supporting the tubular device element;
A container filled with an insulating gas, containing the central conductor, the tubular device element and the support member;
With
The cylindrical device element is disposed between at least one opening on a surface facing the central conductor, two or more partial elements each of which circulates around the central conductor, and the two or more partial elements, An interval holder for holding an interval between the partial elements ,
In the vicinity of the opening, the distance between the surface of the spacing member facing the central conductor and the central axis of the central conductor is the distance between the surface of the partial element facing the central conductor and the central axis of the central conductor. Greater than the distance,
A gas insulated switchgear characterized by the above.   The at least one opening is formed at or near a position including a lowermost end of a surface of the cylindrical device element facing the central conductor in an installation posture in which the central conductor is substantially horizontal. The gas insulated switchgear according to claim 1. The at least one opening is formed along a lowermost end of a surface of the tubular device element facing the center conductor, or a plurality of openings including the at least one opening are formed in the tubular device element. The gas insulated switchgear according to claim 2, wherein the gas insulated switchgear is arranged along the lowermost end. The at least one opening extends in a direction substantially parallel to the central axis of the tubular device element, or a plurality of openings including the at least one opening are substantially parallel to the central axis of the tubular device element. The gas insulated switchgear according to claim 1, wherein the gas insulated switchgear is arranged in various directions. The at least one opening continues from one axial end to the other end of the cylindrical device element;
The gas insulated switchgear according to any one of claims 1 to 4, wherein the gas insulated switchgear is provided. The tubular device element includes at least one sensor and an electric field shield disposed between the central conductor and the sensor,
The at least one opening is formed in the electric field shield;
The gas insulated switchgear according to any one of claims 1 to 5, wherein The tubular device element includes at least one sensor arranged to circulate around the central conductor, and an electric field shield arranged between the central conductor and the at least one sensor and circulated around the central conductor. ,
The at least one opening is formed in the electric field shield;
The gas insulated switchgear according to any one of claims 1 to 5, wherein The circumferential width of the cylindrical device element of the at least one opening is smaller than the distance between the surface of the electric field shield facing the central conductor and the surface of the sensor facing the central conductor,
The gas insulated switchgear according to claim 6 or 7, characterized in that The at least one sensor constituting the tubular device element is formed of a transformer that circulates around the central conductor.
The gas insulated switchgear according to claim 6, 7 or 8. The electric field in the first space between the central conductor and the tubular device element when a current flows through the central conductor is greater than the electric field in the second space under the at least one opening, Foreign matter can fall into the second space by gravity from the at least one opening.
The gas-insulated switchgear according to any one of claims 1 to 9, wherein A central conductor through which current flows;
A cylindrical device element arranged to circulate around the central conductor;
A support member provided on at least one end of the tubular device element, and supporting the tubular device element;
A container filled with an insulating gas, containing the central conductor, the tubular device element and the support member;
With
The cylindrical device element is disposed between at least one opening on a surface facing the central conductor, two or more partial elements each of which circulates around the central conductor, and the two or more partial elements, An interval holder for holding an interval between the partial elements,
The gap holder has an opening at a position facing the opening of the tubular device element.
Features and to Ruga scan insulated switchgear that. The interval holder is composed of two or more members arranged in the circumferential direction of the tubular device element,
Two or more members constituting the gap holder are arranged with a gap forming the opening,
The gas insulated switchgear according to claim 11 . The circumferential width of the opening of the gap holder is larger than the circumferential width of the opening of the tubular device element,
The gas insulated switchgear according to claim 11 or 12 , characterized in that The gas insulated switchgear according to any one of claims 1 to 13 , further comprising an adhesive layer at a position facing the central conductor across the opening. The circumferential width of the adhesive layer is larger than the circumferential width of the opening of the tubular device element, or the axial length of the adhesive layer is larger than the axial length of the opening. ,
The gas insulated switchgear according to claim 14 . The adhesive layer is formed of a gel-like material sheet, a double-sided adhesive tape, or an adhesive paint.
The gas insulated switchgear according to claim 15 .

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