JP7527568B2 - Voltage detection capacitor, voltage detection capacitor unit, and insulating coating - Google Patents

Description

The present invention relates to a voltage detection capacitor, a voltage detection capacitor unit, and an insulating coating. More specifically, the present invention relates to a voltage detection capacitor, a voltage detection capacitor unit, and an insulating coating that can reduce manufacturing costs by reducing the number of parts and simplifying assembly.

Traditionally, high-voltage power distribution lines drawn from substations have been laid out in a network of numerous utility poles erected throughout the city to supply electricity to consumers. These utility poles are equipped with switches at various points at the entrances to consumers' homes to set up demarcation points or to separate work sections or fault sections from other sections of the distribution line. For example, in the event of an abnormality, or when inspecting or repairing electrical equipment, these switches are operated to temporarily cut off the flow of current.

The switch is made of a metal main case and a lid case that closes the opening of the main case and is detachably attached to the main case. Inside the switch are mainly an electric circuit opening and closing mechanism that enables electrical connection and disconnection, a transformer that supplies power to the control device that controls the switch, a lightning arrester to protect various power devices from abnormally high voltages caused by lightning, and a voltage detection capacitor as a voltage detection sensor for the power distribution path, among other power devices (see, for example, Patent Document 1).

This voltage detection capacitor is made by stacking and connecting multiple capacitor elements in series, each made of high-dielectric ceramic covered with an insulating film such as epoxy resin, and providing terminals on both the high-voltage and low-voltage ends. Figure 6 shows the conventional installation structure of this voltage detection capacitor inside a switch.

The voltage detection capacitor unit 101 is composed of a voltage detection capacitor 102 in which a capacitor element (not shown) is loaded inside a bellows-shaped insulating coating, and a mounting plate 103 which is an earth surface for fixing the voltage detection capacitor 102 inside the switch. The voltage detection capacitor 102 is fixed to the mounting plate 103 with the required insulation treatment applied, with the upper side being the high voltage side and the lower side being the low voltage side in Fig. 6.

Specifically, the voltage detection capacitor is supported by a base 104, and is further fixed with insulating bolts and nuts 105 so that a predetermined clearance is secured between the base 104 and the mounting plate 103. The voltage detection capacitor unit 101 configured in this manner has the mounting plate 103 fixed to the case surface of the switch by fixing means such as bolts and nuts.

JP 2002-A

As mentioned above, when installing a voltage detection capacitor inside a switch case, the capacitor element is loaded into the insulating coating and then firmly fixed to the mounting plate, which serves as the earth surface, with bolts and nuts. However, if the bolts and nuts are made of metal, they become conductors and must also be insulated. In this way, the conventional structure for installing a voltage detection capacitor in a switch requires a large number of parts, which makes assembly complicated and requires a lot of man-hours for assembly.

The present invention was devised in light of the above points, and aims to provide an insulating coating and a voltage detection capacitor that can reduce manufacturing costs by reducing the number of parts and simplifying assembly.

In order to achieve the above object, the voltage detection capacitor of the present invention is a voltage detection capacitor comprising a capacitor element having a high-voltage side terminal and a low-voltage side terminal, and an insulating coating made of an elastic member having a housing portion formed therein for mounting the capacitor element, the insulating coating comprising a cylindrical main body portion having an open end at one end through which a lead wire connected to the high-voltage side terminal of the capacitor element can be inserted, an inner flange portion having a fitting groove recessed radially inward along the circumferential direction and connected to the other end of the main body portion on one side thereof, and an outer flange portion having an open end at which a lead wire connected to the low-voltage side terminal can be inserted on the other side thereof, the base end portion being wider radially outward than the outer circumferential surface of the main body portion.

Here, the voltage detection capacitor is mainly composed of a capacitor element having a high-voltage terminal and a low-voltage terminal, and an insulating coating made of an elastic material with a container formed inside for loading the capacitor element. This allows the entire capacitor element to be insulated by the insulating coating, making it possible to output a high voltage input to the high-voltage terminal from the low-voltage terminal.

The insulating coating also has a cylindrical body with an open end at one end through which a lead wire connected to the high-voltage terminal of the capacitor element can be inserted, so that with the capacitor element loaded inside the insulating coating, the high-voltage terminal, which is the high-voltage input side, can be connected to a specified device with a lead wire.

In addition, by providing a base end portion connected to the main body portion and having a fitting groove formed therein that is recessed radially inward along the circumferential direction, when fixing the voltage detection capacitor to the mounting plate, which is the ground surface, the edge of the insertion hole formed in the mounting plate is fitted into the fitting groove to elastically hold the voltage detection capacitor in place, making it possible to easily assemble the voltage detection capacitor to the mounting plate without using bolts and nuts, etc.

The base end has an inner flange portion connected to the other end of the main body portion on one side across the fitting groove, and an outer flange portion formed with an open end through which a lead wire connected to the low-voltage terminal can be inserted on the other side across the fitting groove, thereby ensuring the rigidity of the base end and allowing the electrically connected lead wire connected to the low-voltage terminal of the capacitor element to be wired from the open end of the outer flange portion to the outside.

In addition, the base end is wider radially outward than the outer circumferential surface of the main body, so that, for example, the outer diameter of the fitting groove can be made to roughly match the inner diameter of the insertion hole in the mounting plate. With this configuration, when fitting the insertion hole in the mounting plate into the fitting groove in the base end, the insulating coating is first inserted into the insertion hole in the mounting plate from the main body side, and then the edge of the insertion hole can be fitted into the fitting groove while elastically deforming the base end, so that the voltage detection capacitor can be easily assembled to the mounting plate.

In addition, if the inner flange portion has an inclined surface that slopes radially outward from the connecting portion with the main body portion toward the fitting groove, as described above, when fitting the edge of the through hole of the mounting plate into the fitting groove while elastically deforming the base end of the insulating coating, the edge of the through hole of the mounting plate can be moved along the inclined surface, thereby further improving workability.

In addition, if the fitting groove has a stopper portion that protrudes radially outward, the stopper portion functions as a rotation stopper, so that even if an external force or vibration is applied to the voltage detection capacitor, it is possible to prevent the voltage detection capacitor from becoming misaligned with the mounting plate or from falling off the mounting plate.

In addition, if the outer flange has a notch formed by cutting out part of the open end along the side, it is possible to route lead wires from the notch to the outside even when the bottom surface of the outer flange is placed on the installation surface.

In order to achieve the above object, the voltage detection capacitor unit of the present invention comprises a capacitor element having a high-voltage side terminal and a low-voltage side terminal, a cylindrical main body having an open end at one end through which a lead wire connected to the high-voltage side terminal of the capacitor element can be inserted, an inner flange having a fitting groove recessed radially inward along the circumferential direction and connected to the other end of the main body on one side of the fitting groove, and an outer flange having an open end through which a lead wire connected to the low-voltage side terminal can be inserted on the other side of the fitting groove, the insulating coating having a base end that is wider radially outward than the main body, and a housing portion for loading the capacitor element formed therein, and a mounting plate having an insertion hole through which the main body of the insulating coating can be inserted and whose inner diameter is approximately equal to the outer diameter of the fitting groove.

With the above-mentioned configuration, the insulating coating with the capacitor element loaded inside can be easily attached to the mounting plate without using any special tools. Furthermore, the mounting plate and the insulating coating are firmly fixed in place with the edge of the insertion hole formed in the mounting plate fitting into the fitting groove formed in the base end of the insulating coating, so a certain level of mounting strength can be ensured even when external forces or vibrations are applied.

In addition, the fitting groove formed in the base end has a stopper portion that protrudes radially outward, and when the edge of the insertion hole in the mounting plate is cut along the plane of the mounting plate to form a fitting portion that fits with the stopper portion, the stopper portion and the fitting portion fit together when the edge of the insertion hole in the mounting plate is fitted into the fitting groove formed in the base end, and the stopper portion can function as a rotation stopper. Therefore, even if an external force or vibration is applied to the voltage detection capacitor, it is possible to prevent the positional relationship between the voltage detection capacitor and the mounting plate from shifting, or the voltage detection capacitor from falling off the mounting plate.

In order to achieve the above object, the insulating coating of the present invention is an insulating coating in which a capacitor element is loaded, the insulating coating comprises a cylindrical main body portion having an open end at one end through which a lead wire connected to the high-voltage terminal of the capacitor element can be inserted, an inner flange portion having a fitting groove recessed radially inward along the circumferential direction, one side of which is connected to the other end of the main body portion across the fitting groove and has an inclined surface that slopes radially outward toward the fitting groove, and an outer flange portion having an open end at which a lead wire connected to the low-voltage terminal of the capacitor element can be inserted across the other side of the fitting groove, and a base end portion that is wider radially outward than the outer circumferential surface of the main body portion.

With the above-mentioned configuration, the insulating coating in which the capacitor element is loaded can be easily attached to the mounting plate without using any special tools. Furthermore, the mounting plate and the insulating coating are firmly fixed in place with the edge of the insertion hole formed in the mounting plate fitting into the fitting groove formed in the base end of the insulating coating, so a certain level of mounting strength can be ensured even when external forces or vibrations are applied.

The voltage detection capacitor, voltage detection capacitor unit, and insulating coating of the present invention can reduce manufacturing costs by reducing the number of parts and simplifying assembly.

FIG. 1 is a perspective view of a switch according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the switch shown in FIG. FIG. 2 is a cross-sectional view of a voltage detection capacitor unit. 4A and 4B are external views of an insulating coating, in which FIG. 4A is a front perspective view and FIG. 3A is an enlarged exploded view of a main portion of the voltage detection capacitor unit, and FIG. 3B is a view showing the assembled state. FIG. 1 illustrates the prior art.

The voltage detection capacitor, voltage detection capacitor unit, and insulating coating according to the embodiments of the present invention will be described below with reference to the drawings to facilitate understanding of the present invention.

For ease of explanation, in each figure, when the switch is installed, the direction from the bottom surface to the top surface is defined as the upward direction, the opposite direction to the upward direction is defined as the downward direction, the axial direction represented by the upward and downward directions is defined as the vertical direction, the electrical connection direction of the one-side bushing and the other-side bushing connected to the distribution line is defined as the short direction, and the direction parallel to the rotation axis of the circuit switching mechanism is defined as the long direction.

First, the overall configuration of a switch 1 to which the present invention is applied will be described with reference to Figures 1 and 2. The switch 1 is a pole-mounted switch that is installed on a utility pole as a responsibility demarcation point at, for example, the entrance of a consumer, and is equipped with a metal case 2 that houses various power supply devices.

Here, the switch 1 does not necessarily have to be a pole-mounted switch. For example, as long as it can open and close the load current under normal conditions and can also input an abnormal current when the circuit is short-circuited, the switch may be used for any purpose.

When the switch 1 is installed on a utility pole, it is composed of a main body case 21 with an opening that opens downward, and a lid case 22 that can be attached and detached to the main body case 21 so as to close the opening of the main body case 21, and various power supply devices etc. are stored inside the case 2.

Here, the lid case 22 does not necessarily have to be a type that closes an opening that opens downwards on the main case 21. For example, an opening may be formed at the top of the main case 21, and the lid case 22 may close the top opening of the main case 21. For convenience, the present invention will be described as a type in which the lid case 22 closes the bottom opening of the main case 21.

The main body case 21 is provided with bushings 3, one side bushings 31 connected to the distribution lines in the power distribution system, and the other side bushings 32 connected to the distribution lines, facing each other for each phase. In this embodiment, a total of six bushings 3 are provided along the longitudinal direction, including the one side bushings 31 for the three phases U, V, and W and the other side bushings 32 for the three phases U, V, and W. Electrical connection and interruption of the distribution lines is performed through these one side bushings 31 and the other side bushings 32. The electrical connection and interruption between the one side bushings 31 and the other side bushings 32 is controlled by turning on and off the circuit opening and closing mechanism 4, which is composed of a movable contact portion 41 and a fixed contact portion 42.

Specifically, the movable contact portion 41 has a shaft portion rotatably attached to the load side terminal 43, and a part of the movable contact portion 41 is supported on the main body case 21 by a link device 44. An operating handle 45 that can be operated from the outside of the main body case 21 is connected to the connection portion between the movable contact portion 41 and the link device 44, and the fixed contact portion 42 and the movable contact portion 41 can be turned on and off by rotating the operating handle 45 in a predetermined rotational direction. That is, when the fixed contact portion 42 and the movable contact portion 41 come into contact (on operation), the one side bushing 31 and the other side bushing 32 are electrically connected. On the other hand, when the fixed contact portion 42 and the movable contact portion 41 are released (off operation), the electrical connection between the one side bushing 31 and the other side bushing 32 is interrupted.

Here, the switch 1 does not necessarily have to be a three-phase type, and may be a single-phase type. In that case, only one set of the fixed contact portion 42, the movable contact portion 41, and the link device 44 housed in the switch 1 will be installed.

Furthermore, the on/off operation of the fixed contact portion 42 and the movable contact portion 41 does not necessarily have to be performed manually with the operating handle 45. For example, the fixed contact portion 42 and the movable contact portion 41 may be configured to automatically open when an abnormality such as a short circuit is detected in the power supply device in the switch 1.

In the present invention, a set of the fixed contact portion 42, the movable contact portion 41, and the link device 44 as described above is provided for three phases (i.e., a total of three sets) according to the number of one-side bushings 31 and the other-side bushings 32, and a bottomed cover (not shown) that opens upward is attached to each set so as to cover them.

A current transformer 46 is installed near where the other bushing 32 of the main body case 21 is connected to detect excessive current flow.

A transformer 5 is placed inside the cover case 22 to supply power to the control device that controls the switch. This transformer 5 has a known structure, and is composed of, for example, an iron core that forms a magnetic circuit (not shown), and an electric winding that forms an electric circuit and is coated with organic resin for insulation. In addition, a lightning arrester 6 is connected to this transformer 5 to protect various power equipment from transient abnormally high voltages caused by lightning.

In the main body case 21, multiple voltage detection capacitors (PD) 71 are installed for each phase along the longitudinal direction of the main body case 21 diagonally above the fixed contact portion 42 and the movable contact portion 41. The voltage detection capacitors 71 are provided for each phase corresponding to the one side bushing 31 and the other side bushing 32 so that their tips point toward a predetermined position within the main body case 21. The tip side of each voltage detection capacitor 71 is connected to the power supply side and the load side charging section, respectively, via conductors not shown, and the base end side is grounded and connected to the main body case 21.

Here, the voltage detection capacitor 71 does not necessarily have to be installed above the main body case 21. The installation position can be changed as appropriate, taking into account the layout with other devices arranged inside the main body case 21.

As shown in Figures 3 and 4, the voltage detection capacitor 71 is composed of a capacitor element 72 and an insulating coating 73 that covers the outer periphery of the capacitor element 72. The voltage detection capacitor 71, which is insulated by the insulating coating 73, is attached to a mounting plate 74, which is the ground surface, and is fixed to the main body case 21 by known fixing means such as bolts and nuts. The voltage detection capacitor 71 attached to the mounting plate 74, which is the ground surface, is called the voltage detection capacitor unit 7.

The insulating coating 73 is made of an insulating material such as synthetic resin, has an internal space for loading the capacitor element 72 inside, and covers the entire circumference of the capacitor element 72 in a tightly contacting state. The specific structure of the insulating coating 73 is composed of a main body 731 having a long cylindrical shape overall, and a base end 732 that is connected to the main body 731 and has a shape wider than the outer circumferential surface of the main body 731.

An open end 731a is formed on one end of the main body 731 so that a lead wire (not shown) connected to the high-voltage terminal of the capacitor element 72 loaded inside can be inserted. In addition, the outer periphery of the side surface of the main body 731 has a bellows structure in which convex portions 731b and concave portions 731c are alternately arranged in a ring shape.

A base end 732 for fixing to the mounting plate 74 is connected to the opposite side of the open end 731a of the main body 731, and is integrated with the main body 731. The base end 732 is made of the same material as the main body 731 (e.g., synthetic resin), and has a fitting groove 732a recessed around the entire periphery of the side into which the edge of the insertion hole 741 formed in the mounting plate 74 fits. Then, on one side of the fitting groove 732a, there is an inner flange 732b that connects to the main body 731, and on the other side, there is an outer flange 732c.

The fitting groove 732a is a generally rectangular cross-section recessed toward the radial inside of the base end 732, and is formed along the circumferential direction at approximately the center position in the height direction of the base end 732. In addition, a pair of stopper portions 732d protruding toward the radial outside are integrally molded with the base end 732 at a predetermined position of the fitting groove 732a. As described below, the stopper portions 732d fit into fitting portions 743 formed on the mounting plate 74, which is the ground surface, and function as a rotation stopper for the insulating coating 73 relative to the mounting plate 74.

Here, the fitting groove 732a does not necessarily have to have a substantially rectangular cross section. As long as the edge of the insertion hole formed in the mounting plate 74 described below can be fitted into the fitting groove and the fitting groove can be elastically held, the fitting groove may be formed in a V-shape or a U-shape, and the shape of the fitting groove 732a is not particularly limited.

In addition, the fitting groove 732a does not necessarily have to be formed around the entire circumference along the side surface of the base end 732, but may be formed at regular intervals as fitting grooves recessed toward the inside in the radial direction.

The number of stopper portions 732d or the installation intervals can be changed as appropriate, but from the viewpoint of preventing the positional relationship between the voltage detection capacitor 71 and the mounting plate 74 from shifting or the voltage detection capacitor 71 from coming off the mounting plate 74 even if an external force or vibration is applied to the voltage detection capacitor 71, it is preferable to set at least two stopper portions diagonally around the fitting groove 732a.

One end of the inner flange portion 732b is connected to the other end of the main body portion 731, and the side surface has an inclined surface that gradually widens radially outward from the main body portion 731 to the fitting groove 732a.

Here, it is not necessary that the side surface of the inner flange portion 732b is formed with an inclined surface. However, forming an inclined surface makes it easier to assemble to the mounting plate 74 described below. Therefore, from the viewpoint of reducing the number of assembly steps, it is preferable that the side surface shape of the inner flange portion 732b is formed with an inclined surface.

The outer flange portion 732c is connected to the opposite side of the inner flange portion 732b across the fitting groove 732a. An open end 732e is formed at the end of the outer flange portion 732c so that a lead wire (not shown) connected to the low-voltage terminal of the capacitor element 72 can be inserted therethrough, and a notch 732f is formed in part of the open end 732e along the side direction.

Here, it is not necessary that the notch 732f is formed in a part of the open end 732e of the outer flange portion 732c. However, by forming the notch 732f, even when the outer flange portion 732c is placed on the main body case 21 with the bottom surface of the outer flange portion 732c, the lead wire connected to the capacitor element 72 can be wired through the notch 732f. Therefore, from the viewpoint of securing wiring space, it is preferable that the notch 732f is formed.

As shown in FIG. 5, the mounting plate 74 is the ground surface for the voltage detection capacitors 71, and also functions as a fixture for fixing the voltage detection capacitors 71 to the main body case 21 in an assembled state. The mounting plate 74 is a flat plate of approximately rectangular shape, with both ends in the longitudinal direction bent, and the flat portion has insertion holes 741 formed therein according to the number of voltage detection capacitors 71 to be assembled (three insertion holes 741 are formed because the embodiment of the present invention is a three-phase type). The inner diameter of the insertion hole 741 is formed to a length that is approximately equal to the outer diameter of the fitting groove 732a of the insulating coating 73.

A fitting portion 743 that fits with the stopper portion 732d of the base end portion 732 of the insulating coating 73 when the voltage detection capacitor 71 is assembled is cut out along the flat portion 745 of the mounting plate 74 at the edge portion 742 of the insertion hole 741. As described above, the stopper portion 732d and the fitting portion 743 fit together to prevent rotation, strengthening the fixation of the voltage detection capacitor 71 to the mounting plate 74. Therefore, even if an external force or vibration is applied to the voltage detection capacitor 71, the voltage detection capacitor 71 can be prevented from coming off.

In addition, between each of the insertion holes 741 of the mounting plate 74, fixing holes 744 are formed through which bolts and nuts 75 can be inserted to fix the mounting plate 74 to the main body case 21. Then, with the voltage detection capacitor 71 attached to the mounting plate 74, the voltage detection capacitor unit 7 can be firmly fixed to the main body case 21 by inserting the bolts and nuts 75 into the fixing holes 744.

Next, the process of assembling the voltage detection capacitor 71 to the mounting plate 74 will be described with reference to FIG. 5. In the following description, the front and back surfaces of the flat portion 745 will be defined as the side where the main body portion 731 of the insulating coating 73 is exposed when the voltage detection capacitor 71 is assembled to the mounting plate 74, and the opposite side will be referred to as the front surface, and the back surface, respectively.

First, with the base end 732 of the insulating coating 73 placed on the installation surface, the tip of the main body 731 is inserted into the insertion hole 741 from the back side of the mounting plate 74.

Once the main body 731 is inserted through the insertion hole 741 of the mounting plate 74, the mounting plate 74 is moved to a position where it contacts the inner flange portion 732b of the base end portion 732. At this time, since the outer diameter of the inner flange portion 732b is formed with an inclined surface that slopes toward the fitting groove 732a, the mounting plate 74 can be moved more smoothly along the inclined surface.

When the edge 742 of the insertion hole 741 comes into contact with the inclined surface of the inner flange portion 732b, the mounting plate 74 is rotated and adjusted so that the fitting portion 743 formed on the edge 742 of the insertion hole 741 fits into the stopper portion 732d of the insulating coating 73. When the surface of the mounting plate 74 is then pressed down toward the installation surface, the base end portion 732 elastically deforms, so that the stopper portion 732d fits into the fitting portion 743, and the edge 742 of the insertion hole 741 fits into the fitting groove 732a.

At this time, the edge 742 of the insertion hole 741 is elastically held by the fitting groove 732a, and the fitted state between the stopper portion 732d and the fitting portion 743 is maintained, completing the assembly of the voltage detection capacitor 71 to the mounting plate 74.

As described above, the voltage detection capacitor, voltage detection capacitor unit, and insulating coating of the present invention can reduce manufacturing costs by reducing the number of parts and simplifying assembly.

REFERENCE SIGNS LIST 1 Switch 2 Case 21 Main body case 22 Cover case 3 Bushing 31 One side bushing 32 Other side bushing 4 Electric circuit opening and closing mechanism 41 Movable contact portion 42 Fixed contact portion 43 Load side terminal 44 Link device 45 Operating handle 46 Current transformer 5 Transformer 6 Lightning arrester 7 Voltage detection capacitor unit 71 Voltage detection capacitor 72 Capacitor element 73 Insulating coating 731 Main body portion 731a Open end 731b Convex portion 731c Concave portion 732 Base end portion 732a Fitting groove 732b Inner flange portion 732c Outer flange portion 732d Stopper portion 732e Open end 732f Notch portion 74 Mounting plate 741 Insertion hole 742 Edge portion 743 Fitting portion 744 Fixing hole 745 Flat portion 75 Bolt and nut

Claims (7)

A voltage detection capacitor comprising: a capacitor element having a high-voltage side terminal and a low-voltage side terminal; and an insulating coating made of an elastic member having a housing portion formed therein for mounting the capacitor element,
The insulating coating is
a cylindrical main body having an open end at one end through which a lead wire connected to a high-voltage terminal of the capacitor element can be inserted;
a base end portion having a shape wider radially outward than an outer circumferential surface of the main body portion, the base end portion having an inner flange portion on one side thereof across the fitting groove, the inner flange portion being connected to the other end of the main body portion and the other side thereof across the fitting groove, the base end portion having an open end through which a lead wire connected to the low-voltage side terminal can be inserted, the base end portion having a shape wider radially outward than an outer circumferential surface of the main body portion. The voltage detection capacitor according to claim 1 , wherein the inner flange portion has an inclined surface that is inclined radially outward from a portion where the inner flange portion is connected to the main body portion toward the fitting groove. 3. The voltage detection capacitor according to claim 1, wherein the fitting groove has a stopper portion protruding radially outward. The voltage detection capacitor according to claim 1 , wherein the outer flange portion has a notch formed by cutting out a part of an open end along a side surface. a capacitor element having a high voltage side terminal and a low voltage side terminal;
an insulating coating including a cylindrical main body portion having an open end at one end through which a lead wire connected to the high-voltage side terminal of the capacitor element can be inserted, an inner flange portion having a fitting groove recessed radially inward along a circumferential direction and connected to the other end of the main body portion on one side thereof across the fitting groove, and an outer flange portion having an open end through which a lead wire connected to the low-voltage side terminal can be inserted on the other side thereof across the fitting groove, the insulating coating having a base end portion having a shape that is wider radially outward than the main body portion, and an accommodation portion formed inside for loading the capacitor element;
a mounting plate having an insertion hole through which the main body portion of the insulating coating can be inserted and whose inner diameter is approximately the same as the outer diameter of the fitting groove. The fitting groove formed in the base end portion has a stopper portion protruding radially outward,
The voltage detection capacitor unit according to claim 5 , wherein an edge of the insertion hole of the mounting plate is cut out along a plane of the mounting plate to form a fitting portion that fits with the stopper portion. In the insulating coating in which the capacitor element is loaded,
The insulating coating is
a cylindrical main body having an open end at one end through which a lead wire connected to a high-voltage terminal of the capacitor element can be inserted;
an insulating coating comprising: an inner flange portion having a fitting groove formed in a circumferential direction and recessed radially inward, one side of the fitting groove being connected to the other end of the main body portion and having an inclined surface inclined radially outward toward the fitting groove; and an outer flange portion having an open end on the other side of the fitting groove through which a lead wire connected to a low-voltage terminal of a capacitor element can be inserted, the outer flange portion having a base end that is wider radially outward than the outer circumferential surface of the main body portion.

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