Partial discharge measuring device

Abstract

To provide a partial discharge measuring device that can be easily attached to an electric power conductor or an electric power cable.SOLUTION: A partial discharge measuring device (1) measures partial discharge occurring inside a high-voltage apparatus, and the partial discharge measuring device has: a partial discharge antenna (110) that detects partial discharge; a circuit board (120) that wirelessly sends a measured value of the partial discharge; an insulating case (130) that accommodates the partial discharge antenna and the circuit board in a surface contact state; and an attachment part that is provided on the insulating case to attach a fixture.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a partial discharge measuring device. [Background technology]

[0002] Patent Document 1 discloses an invention relating to a partial discharge diagnostic system and method suitable for detecting partial discharge occurring inside high-voltage equipment and diagnosing the presence or absence of insulation degradation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6253775 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a known partial discharge measuring device in which a partial discharge antenna for receiving partial discharges and a circuit board for detecting and processing the partial discharge antenna signal are provided separately and connected by a wire. With such a configuration, installation work is time-consuming.

[0005] In view of the above circumstances, an object of the present invention is to provide a partial discharge measuring device that can be easily attached to a power conductor or a power cable. [Means for solving the problem]

[0006] A partial discharge measuring device according to one embodiment of the present invention is a partial discharge measuring device that measures partial discharges occurring inside high-voltage equipment, and comprises a partial discharge antenna that detects the partial discharge, a circuit board that wirelessly transmits a measurement value of the partial discharge, an insulating case that houses the partial discharge antenna and the circuit board in surface contact, and an attachment portion provided on the insulating case for attaching a fixing device. Effect of the Invention

[0007] According to one embodiment of the present invention, there is provided a partial discharge measuring device that can be easily attached to a power conductor or a power cable. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram showing a state in which the partial discharge measuring device according to the present embodiment is attached to a bus bar. [Diagram 2] 1 is a diagram showing a state in which a partial discharge measuring device according to an embodiment of the present invention is attached to a power cable; [Diagram 3] FIG. 2 is a five-view diagram of the partial discharge measuring device according to the present embodiment. [Figure 4] FIG. 1 is an exploded perspective view of a partial discharge measuring device according to an embodiment of the present invention. [Diagram 5] 1 is a partially exploded perspective view showing a partial discharge measuring device according to the present embodiment in a state in which a battery is assembled in an upper case, a partial discharge antenna is assembled in a lower case, and the rest is disassembled. FIG. [Figure 6] FIG. 6 is a partial exploded perspective view showing a state in which a circuit board is attached from FIG. 5. [Figure 7] 7 is a partial exploded perspective view showing a state in which a cover member is attached from FIG. 6. FIG. [Figure 8] 1 is a perspective view of a partial discharge measuring device according to an embodiment of the present invention, as viewed from below. FIG. [Figure 9] 2 is an enlarged perspective view showing a partial discharge antenna and a lower case of the partial discharge measuring device according to the present embodiment. FIG. [Figure 10] 1 is a cross-sectional view of a partial discharge measuring device according to an embodiment of the present invention. [Figure 11] FIG. 2 is a diagram showing a state in which a cable bundling band is attached to the partial discharge measuring device according to the present embodiment. [Figure 12] FIG. 2 is a diagram showing a state in which the partial discharge measuring device according to the present embodiment is fixed to a bus bar using a cable band. [Figure 13] FIG. 2 is a diagram showing a state in which the partial discharge measuring device according to the present embodiment is fixed to a power cable using a cable tie. [Figure 14] FIG. 2 is a diagram showing a partial discharge measuring device fixed to a high voltage charging section in the present embodiment with an upper case removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The following description relates to a partial discharge measuring device according to an embodiment of the present invention. A partial discharge measuring device according to one embodiment of the present invention is a device for measuring partial discharge occurring inside high-voltage equipment, and is attached to, for example, a charging section of high-voltage equipment. When insulation failure occurs in electrical equipment, partial discharge, which is a weak localized discharge phenomenon, occurs. The partial discharge measuring device according to this embodiment detects the partial discharge and wirelessly transmits transmission data including a partial discharge measurement value to a terminal device such as a PC (Personal Computer). The terminal device can diagnose insulation performance based on the received transmission data and prevent serious accidents from occurring.

[0010] [Outline of the partial discharge measuring device 1 according to the present embodiment] 1 shows a state in which a partial discharge measuring device 1 according to this embodiment is attached to a busbar 2a. The busbar 2a is a conductor that conducts a large amount of current, and is an example of a high-voltage charging section 2 of a high-voltage device. The busbar 2a is connected to, for example, another busbar using a bolt 3 and a nut (not visible in the drawing).

[0011] 2 shows a state in which the partial discharge measuring device 1 according to this embodiment is attached to a power cable 2b. The power cable 2b is, for example, a CV cable (Cross-linked Polyethylene Insulated Vinyl Sheath Cable) having an electric wire that conducts a large amount of current, and is an example of the high voltage charging unit 2. A crimp terminal 4 is attached to the tip of the power cable 2b.

[0012] In the following description, for convenience, the up-down direction of the partial discharge measuring device 1 is defined as the z direction, the front-rear direction of the partial discharge measuring device 1 is defined as the x direction, and the left-right direction of the partial discharge measuring device 1 is defined as the y direction. The mutually perpendicular x-, y-, and z-directions form a left-handed system.

[0013] In addition, the positive z direction is defined as the upward direction, the negative z direction is defined as the downward direction, the positive x direction is defined as the forward direction, the negative x direction is defined as the backward direction, the positive y direction is defined as the rightward direction, and the negative y direction is defined as the leftward direction. The names of directions are used for convenience in explaining the relative positional relationships of components, and do not indicate absolute directions.

[0014] Fig. 3 is a five-sided view of the partial discharge measuring device 1. Fig. 4 is an exploded perspective view of the partial discharge measuring device 1. Figs. 5 to 7 are perspective views of a partially exploded state of the partial discharge measuring device 1. Fig. 8 is a perspective view of the partial discharge measuring device 1 as viewed from below.

[0015] 4, the partial discharge measuring device 1 includes a partial discharge antenna 110 that receives partial discharges, a circuit board 120 that wirelessly transmits a measurement value measured by the partial discharge antenna 110, an insulating case 130 that houses the partial discharge antenna 110 and the circuit board 120, and a hole 134g (see FIG. 8) for attaching a fastener, which is provided on a lower surface 134A of the insulating case 130. The hole 134g is an example of an attachment portion.

[0016] 4 and other figures, insulating case 130 has upper case 132 (an example of a first case), lower case 134 (an example of a second case), and cover member 136. Upper case 132, lower case 134, and cover member 136 are formed of insulating resin such as polycarbonate.

[0017] The inside of the box-shaped insulating case 130 is divided into two spaces, an upper space and a lower space, by a substantially flat, plate-like cover member 136. The upper space is defined by the upper case 132 and the cover member 136, and houses the battery 140. The lower space is defined by the lower case 134 and the cover member 136, and houses the partial discharge antenna 110 and the circuit board 120.

[0018] The upper case 132 is formed in a substantially rectangular box shape, and is open on the lower side (the side facing the lower case 134) as shown in Fig. 4. For convenience, this opening will be referred to as "opening OP1". The battery 140 is accommodated in the upper case 132 through the opening OP1.

[0019] The lower case 134 is formed in a substantially rectangular box shape, and is open at the top (the side facing the upper case 132) as shown in Fig. 4. For convenience, this opening is referred to as an "opening OP2". Items including the partial discharge antenna 110 and the circuit board 120 are accommodated in the lower case 134 through the opening OP2.

[0020] FIG. 5 shows the partial discharge antenna 110 housed in the lower case 134, FIG. 6 shows the circuit board 120 housed therein, and FIG. 7 shows the opening OP2 closed by the cover member 136.

[0021] The upper case 132 holds a battery 140, and the upper case 132 is placed over the lower case 134 to complete the partial discharge measuring device 1 having the structure shown in Fig. 3. To attach the partial discharge measuring device 1 to the bus bar 2a shown in Fig. 1 or the power cable 2b shown in Fig. 2, for example, it is necessary to insert a fastener into a hole 134g (see Fig. 8) and attach the device using the fastener; the fastener and the attachment method will be described later.

[0022] [Regarding the partial discharge antenna 110 and the housing portion of the lower case 134] The following describes the structure of the partial discharge antenna 110. Fig. 9 is a perspective view showing the partial discharge antenna 110 separated from the lower case 134.

[0023] The partial discharge antenna 110 comprises a planar portion 111 for detecting partial discharge noise 117 on a surface, a plurality of fixing portions 112 which are integral with the planar portion 111 and bent three-dimensionally, and a side wall portion 113 formed by bending a part of the planar portion 111 vertically.

[0024] 9, a plurality of fixing portions 112 are provided, for example, formed at the four corners of the flat portion 111. Each fixing portion 112 is formed by making a cut in the flat portion 111 and bending the end at a substantially right angle. As a result, the fixing portion 112 is composed of an upright portion 115 and a flat contact portion 116 that comes into surface contact with the circuit board 120. As shown in FIG. 9, a through hole 116a that can be screwed is formed in the center of the contact portion 116.

[0025] As shown in FIG. 9, in the partial discharge antenna 110, the side wall portions 113 between each fixing portion 112 are bent vertically, and when the partial discharge antenna 110 is housed in the lower case 134, the side wall portions 113 are held in contact with the inner wall surface of the lower case 134.

[0026] 9, protrusions 135 are formed at the four corners of the inner bottom surface 134h of the lower case 134. The height of the protrusions 135 is approximately the same as the height of the upright parts 115 of the fixing parts 112 of the partial discharge antenna 110. When the partial discharge antenna 110 is housed in the lower case 134, the contact parts 116 of the fixing parts 112 come into contact with the upper surfaces of the protrusions 135.

[0027] 9, a screw hole 135a is formed in the center of each protrusion 135. Therefore, when the partial discharge antenna 110 is housed in the lower case 134, the through holes 116a located at the four corners of the partial discharge antenna 110 and the screw holes 135a are aligned in the height direction. This allows the partial discharge antenna 110 to be fixed and held in the lower case 134 by using screws, as described later.

[0028] Although there is no limitation on the size of the flat portion 111 of the partial discharge antenna 110, it is preferable that the flat portion 111 is an area of ​​the inner bottom surface 134h excluding the protruding portion 135 and other protrusions.

[0029] The partial discharge antenna 110 is a metal plate, and is made of, but not limited to, brass, copper alloy, or the like.

[0030] [Regarding the circuit board 120] 6, the circuit board 120 has a printed board 122. A processing circuit 124 is mounted on the printed board 122. The processing circuit 124 is electrically connected to the partial discharge antenna 110. The processing circuit 124 converts a measurement value measured by the partial discharge antenna 110 into transmission data.

[0031] In the processing circuit 124 of the circuit board 120, the peak value of the partial discharge noise received by the partial discharge antenna 110 is measured by an analog circuit and digitized. As shown in Fig. 6, an antenna 126 is attached to the printed circuit board 122, and the transmission data generated by the processing circuit 124 is wirelessly transmitted by the antenna 126.

[0032] A battery connector 128 is attached on the printed circuit board 122. The battery connector 128 is connected to a battery connection cable 142 (see FIG. 4). The processing circuit 124 and the antenna 126 operate with power from a battery 140 supplied via the battery connection cable 142 and the battery connection connector 128.

[0033] [Assembly of partial discharge antenna 110 and circuit board 120, and skin effect] 9, a plurality of protruding parts 135 are formed on the inner bottom surface 134h of the lower case 134, and a screw hole 135a is provided at the center of each protruding part 135. The partial discharge antenna 110 is configured to have a flat part 111 and a plurality of fixing parts 112, and each fixing part 112 is bent three-dimensionally. A contact part 116 capable of surface-contacting with the circuit board 120 is formed at a position one step higher than the flat part 111 in the fixing part 112, and a through hole 116a is formed in the contact part 116.

[0034] 4, through holes 120a are formed in the four corners of the circuit board 120. Each through hole 120a is formed at the same position as a through hole 116a provided in the partial discharge antenna 110. The partial discharge antenna 110 and the circuit board 120 are fixed and held in the lower case 134 by screws 152.

[0035] FIG. 10 is a cross-sectional view of the partial discharge measuring device 1 shown in FIG. 1 taken along line AA and viewed from the direction of the arrow.

[0036] 10, the contact portion 116 of the fixing portion 112 of the partial discharge antenna 110 and the circuit board 120 are housed in the lower case 134 with screws 152, and are fixed and held in a surface-to-surface contact state. Also, as shown in FIG. 10, the flat portion 111 of the partial discharge antenna 110 is in contact with the inner bottom surface 134h of the lower case 134.

[0037] As shown in FIG. 10, the partial discharge measuring device 1 of this embodiment is attached to the high-voltage charging unit 2. At this time, an insulating lower case 134 is present between the high-voltage charging unit 2 and the flat portion 111 of the partial discharge antenna 110, and the high-voltage charging unit 2 and the partial discharge antenna 110 are separated in the height direction (Z direction). In reality, the insulating lower case 134 and a space are provided between the high-voltage charging unit 2 and the partial discharge antenna 110. As a result, as shown in FIG. 10, the partial discharge antenna 110 and the high-voltage charging unit 2 are joined by a capacitance C. Therefore, the partial discharge antenna 110 can detect partial discharge by the capacitance C. In this embodiment, since the partial discharge antenna 110 is C-coupled at the flat portion 111, as shown in FIG. 9, partial discharge noise 117 can be detected on a surface. Note that the partial discharge noise 117 shown in FIG. 9 is a conceptual diagram. In this embodiment, the fixed portion 112 is provided integral with the flat portion 111, so that the partial discharge noise 117 is transmitted to the fixed portion 112. 10, the fixed part 112 and the circuit board 120 are in surface contact with each other, and partial discharge noise can be detected well by utilizing the skin effect. For example, partial discharge noise can be detected more accurately than in a configuration in which the partial discharge antenna and the circuit board are connected by a wire.

[0038] [Detailed description of the insulating case 130] In this embodiment, as shown in Figures 5, 6, 7, 10, etc., the insulating case 130 maintains insulation between the partial discharge antenna 110 and the circuit board 120 and the high-voltage charging unit 2, and also maintains insulation between the battery 140 and the high-voltage charging unit 2. Reliable insulation can be maintained with an inexpensive configuration in which the components that need to be insulated from the high-voltage charging unit 2 are surrounded by the insulating case 130.

[0039] 6 and 7, the case surrounding antenna 126 is formed of an insulating case (insulating case 130), so attenuation of transmission data is suppressed when the data is transmitted from antenna 126 to the outside via insulating case 130. This improves communication with the terminal device.

[0040] 10, a pair of snap-type locking portions 132d are formed inside the upper case 132. When the battery 140 is pushed into the upper case 132 (positive side in the z direction), both sides of the battery 140 are clamped by the pair of locking portions 132d and engage with the claw portions 132e. As a result, the battery 140 is held inside the upper case 132.

[0041] The battery 140 is, for example, a lithium battery, but may be another type of battery, such as a voltaic cell or a lithium ion battery.

[0042] In this manner, the battery 140 is housed within the insulating case 130 (upper case 132). That is, the partial discharge measuring device 1 is configured to operate from an electrically independent and insulated power supply source.

[0043] 6, two engagement holes 134aA are formed in each of the left and right side wall portions 134a of the lower case 134. Furthermore, two engagement protrusions 136aA are formed in each of the left and right side surfaces 136a of the cover member 136, as shown in FIG.

[0044] 6 and 7, when the cover member 136 is fitted into the lower case 134 so as to close the opening OP2, the engagement protrusion 136aA of the cover member 136 presses the side wall portion 134a of the lower case 134, elastically deforming it slightly outward. When the engagement protrusion 136aA reaches the engagement hole 134aA, the engagement protrusion 136aA and the engagement hole 134aA engage with each other. As a result, the opening OP2 is closed by the cover member 136, as shown in FIG.

[0045] Furthermore, if the antenna 126 mounted on the printed circuit board 122 is left as is, a portion of the antenna 126 may protrude from the opening OP2 to the outside of the lower case 134. To prevent this, the opening OP2 is closed with a cover member 136. That is, the cover member 136 engages with the lower case 134 to close the opening OP2, thereby preventing an item contained in the lower case 134 (the antenna 126 in this case) from protruding to the outside of the lower case 134 through the opening OP2.

[0046] 7, a cable passage hole 136b is formed in the cover member 136. When the cover member 136 is engaged with the lower case 134, the battery connector 128 is exposed from the cable passage hole 136b, as shown in FIG.

[0047] When the battery connection cable 142 (see FIG. 4) is connected to the battery connection connector 128 exposed from the cable passage hole 136b, the circuit board 120 on which the partial discharge antenna 110 is mounted and the battery 140 are connected, and the circuit board 120 becomes operable.

[0048] 7, a locking portion 132b (an example of an extending portion) is formed on each of the left and right side wall portions 132a of the upper case 132. The locking portion 132b is provided on the side wall portion 134a and extends toward the lower case 134. The locking portion 132b is a snap-type locking portion, and has a claw portion 132c formed at its tip.

[0049] 7, ribs 134b are formed on each of the left and right side wall portions 134a of the lower case 134. The ribs 134b are formed on the side wall portions 134a to extend in the x-direction.

[0050] When the upper case 132 is fitted into the lower case 134 so as to cover the lower case 134, the claw portion 132c rides up onto the rib 134b of the lower case 134, and the lock portion 132b elastically deforms slightly outward. When the claw portion 132c rides over the rib 134b, the claw portion 132c and the rib 134b engage with each other. As a result, as shown in Figs. 8 and 10, the upper case 132 covers the lower case 134 and the cover member 136, and the upper case 132 and the lower case 134 engage with each other. In another aspect, the lower case 134 engages with the upper case 132 to close the opening OP1 of the upper case 132. The rib 134b is an example of an engagement portion with which the claw portion 132c engages.

[0051] As shown in Figures 4 and 10, the partial discharge measuring device 1 has an annular rubber packing 150. The rubber packing 150 is attached around the entire outer wall of the lower case 134. When the upper case 132 and the lower case 134 are engaged with each other, the rubber packing 150 attached to the lower case 134 is crushed between the upper case 132, as shown in Figure 10. This ensures watertightness inside the insulating case 130. Therefore, the partial discharge measuring device 1 can be used not only indoors but also outdoors.

[0052] The rubber packing 150 is formed to have a circular cross section. The cross section of the rubber packing 150 may be changed to match the shapes of the upper case 132 and the lower case 134 that crush the rubber packing 150. In this manner, in the insulating case 130, a rubber packing 150, which is an example of a sealing member, is fitted between the upper case 132 and the lower case 134.

[0053] In FIG. 10, the thick solid line indicated by the symbol CD indicates the creepage distance between the insulating case 130 (more specifically, the lower case 134) and the high voltage charging unit 2 that is in direct contact with the insulating case 130.

[0054] 8 and 10, a rib 134b which is an example of an engagement portion is provided on the lower side of the lower case 134 (the side distal to the upper case 132). Also, the claw portion 132c is provided at the tip of a lock portion 132b (an example of an extension portion) which is formed by extending from a side wall portion 132a of the upper case 132 toward the lower case 134 so as to engage with the rib 134b provided on the lower side of the lower case 134.

[0055] By positioning the claws 132c and ribs 134b, which are the engaging portions of the upper case 132 and the lower case 134, in the above-mentioned positional relationship, the insulating case 130 has a double structure in which the upper case 132 covers the lower case 134. Therefore, the path along the surface of the insulator between the high-voltage charging unit 2 and the circuit board 120 goes around the side wall 134a of the lower case 134, as shown by the thick solid line CD. In this way, the partial discharge measuring device 1 ensures a creepage distance between the insulating case 130 and the high-voltage charging unit 2, which is in direct contact with the insulating case 130.

[0056] As shown by the thick solid line CD, the path along the surface of the insulator between the high-voltage charging unit 2 and the circuit board 120 goes around the rib 134b. In this way, the rib 134b itself, which is an example of an engagement portion, also contributes to ensuring the creepage distance between the insulating case 130 and the high-voltage charging unit 2, which is in direct contact with the insulating case 130.

[0057] A plurality of ribs are provided on the lower surface 134A of the lower case 134. Specifically, a T-shaped rib 134d is formed on the front side (positive side in the x direction) region of the lower surface 134A. A T-shaped rib 134d is formed on the rear side (negative side in the x direction) region of the lower surface 134A in a direction that is inverted from the above-mentioned rib 134d. A pair of ribs 134e extending linearly in the left-right direction (y direction) is formed around the center of the lower surface 134A. The pair of ribs 134e are parallel to each other. A double lattice structured rib 134f extending linearly in the front-back direction (x direction) is formed on each of both ends of the left-right direction of the lower surface 134A.

[0058] These ribs protruding downward from the lower surface 134A of the lower case 134 ensure a distance between the high voltage charging unit 2 and the lower surface 134A (see FIG. 10).

[0059] [Installation of partial discharge measuring device 1 to high voltage charging section 2] The partial discharge measuring device 1 is designed to be easily and reliably attached to the high-voltage charging unit 2 using inexpensive general-purpose parts. Specifically, the partial discharge measuring device 1 is designed to be attached to the high-voltage charging unit 2 using a cable tie 160. Note that a "cable tie" is also sometimes called a "cable tie." FIG. 11 shows a state in which the cable binding band 160 is attached to the partial discharge measuring device 1.

[0060] 8, a hole 134g is provided at the center in the x direction of each of a pair of left and right ribs 134f. The hole 134g is large enough to pass the cable band 160 through. A passage 134eA extending in the left and right direction is formed on the lower surface 134A of the lower case 134 (on the surface facing the charging unit) by a pair of ribs 134e extending parallel to each other in the left and right direction (y direction).

[0061] The cable tie 160 is passed through the hole 134g of one rib 134f, through the passage 134eA, and further through the hole 134g of the other rib 134f. As a result, the cable tie 160 is attached to the partial discharge measuring device 1, as shown in FIG.

[0062] In this manner, the insulating case 30 (more specifically, the lower case 134) has holes 134g (an example of a mounting portion) for mounting the cable bands 160 (an example of a fastener) provided in the lower surface 134A of the lower case 134. The cable bands 160 are attached to the lower case 134 by being passed through the holes 134g.

[0063] Fig. 12 shows a state in which the partial discharge measuring device 1 is fixed to a bus bar 2a using a cable tie 160. Fig. 13 shows a state in which the partial discharge measuring device 1 is fixed to a power cable 2b using a cable tie 160.

[0064] As shown in Figures 12 and 13, the partial discharge measuring device 1 can be fixed to a high-voltage charging section 2 such as a bus bar 2a or a power cable 2b by simply tightening the cable tie band 160 attached to the partial discharge measuring device 1.

[0065] [Effects of the partial discharge measuring device 1 according to the present embodiment] Conventionally, a partial discharge measuring device has been known in which a partial discharge antenna for receiving partial discharges and a circuit board for detecting the signal of the partial discharge antenna are provided separately and connected by a wire. However, such a configuration requires a lot of work to install. Furthermore, because it is connected by a wire, there are problems in terms of safety and partial discharge detection accuracy.

[0066] In contrast to this, in the present embodiment, the partial discharge antenna 110 and the circuit board 120 are housed in an insulating case 130 so as to be partially in surface contact with each other, forming an integrated unit, and the partial discharge measuring device 1 can be easily and reliably fixed to the high voltage charging unit 2 using an attachment portion for attaching a fastener provided on the insulating case 130. Specifically, the partial discharge measuring device 1 can be fixed to the high voltage charging unit 2 by passing a cable band 160 through the attachment portion. Therefore, compared to the conventional case, the configuration for attaching the partial discharge measuring device 1 to the high voltage charging unit 2 is simplified, and there are fewer constraints on attachment.

[0067] In this embodiment, the partial discharge antenna 110 and the circuit board 120 are stored inside the insulating case 130 in a state of surface contact, so that partial discharge noise can be effectively detected by utilizing the skin effect while maintaining insulation.

[0068] Furthermore, in the partial discharge measuring device 1 of this embodiment, by storing the partial discharge antenna and the circuit board inside an insulating case, it is possible to form a compact size and reduce the number of parts, thereby significantly reducing the cost of structural components.

[0069] In this embodiment, since the circuit board that transmits wirelessly is built into the insulating case, the partial discharge measuring device 1 is capable of wireless communication. This allows for a high degree of freedom in the installation of the partial discharge measuring device 1, improving workability.

[0070] The partial discharge measuring device 1 of this embodiment can be battery-powered. Therefore, there is no need to connect the partial discharge measuring device 1 to an outlet, and no need to lay wires, so the partial discharge measuring device 1 can be installed with a high degree of freedom, and workability can be improved.

[0071] Furthermore, as will be described below, battery replacement can be easily performed. Figure 14 shows the partial discharge measuring device 1 fixed to the high voltage charging unit 2 with the upper case 132 removed.

[0072] A snap-type locking portion 132b provided on the upper case 132 allows the upper case 132 to be easily removed from the lower case 134. Furthermore, the cable band 160 is attached to the lower case 134 but is not attached to the upper case 132. Therefore, the upper case 132 can be easily removed while the lower case 134 remains fixed to the high-voltage charging unit 2 with the cable band 160.

[0073] This allows the worker to replace the battery in the following procedure: the worker removes the upper case 132 from the lower case 134, unplugs the battery connection cable 142 from the battery connection connector 128, and removes the battery 140 from the upper case 132. The worker then attaches a new battery 140 to the upper case 132, connects the battery connection cable 142 to the battery connection connector 128, and attaches the upper case 132 to the lower case 134.

[0074] In this way, the worker can replace the battery while the lower case 134 is fixed to the high voltage charging unit 2 with the cable band 160. The worker can easily replace the battery during maintenance or the like.

[0075] During battery replacement, the inside of the lower case 134 is hidden by a cover member 136. The cover member 136 prevents the circuit board 120 and the like from being exposed during battery replacement.

[0076] The above is a description of exemplary embodiments of the present invention. The embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical idea of ​​the present invention. For example, the embodiments of the present application also include appropriate combinations of the embodiments, etc., which are exemplified in the specification, or obvious embodiments, etc. [Explanation of symbols]

[0077] 1: Partial discharge measuring device 2: High voltage charging section 2a: Busbar 2b: Power cable 30: Insulating case 110: Partial discharge antenna 111: Flat part 112:Fixed part 113: Side wall 115: Upright part 116: Contact part 116a: Through hole 117: Partial discharge noise 120: Circuit board 120a:Through hole 122: Printed circuit board 124: Processing circuit 126: Antenna 128: Battery connector 130: Insulating case 132: Upper case 134: Lower case 134A: Bottom surface 134g: hole 134h: Inner bottom surface 135: Protruding part 135a: Screw hole 136: Cover member 136b: Cable hole 140:Battery 142: Battery connection cable 150: Rubber packing 152: Screw 160: Cable tie C: Capacitance OP1: Opening OP2: Opening

Claims

1. In a partial discharge measuring device for measuring partial discharges occurring inside high voltage equipment, A partial discharge antenna for detecting the partial discharge; a circuit board that wirelessly transmits the partial discharge measurement value; an insulating case that houses the partial discharge antenna and the circuit board in surface contact with each other; a mounting portion provided on the insulating case for mounting a fastener.

2. 2. The partial discharge measuring device according to claim 1, wherein the partial discharge antenna has a planar portion that detects the partial discharge on a surface, and a plurality of fixing portions that are integrated with the planar portion and that come into surface contact with the circuit board and are fixed to the insulating case.

3. The partial discharge measuring device according to claim 2 , wherein the fixing portion is formed by three-dimensionally bending a part of the planar portion.

4. 4. The partial discharge measuring device according to claim 3, wherein a plurality of protruding protrusions are provided on an inner bottom surface of the insulating case, and the circuit board is fixed onto the protrusions together with the fixing portion of the partial discharge antenna via the fixing portion.

5. a battery for supplying power to the circuit board; the insulating case has a first case and a second case, the first case accommodates the battery and has an opening on a side facing the second case; The partial discharge measuring device according to claim 1 , wherein the second case houses the partial discharge antenna and the circuit board and engages with the first case to close an opening of the first case.

6. The first case is provided with a claw portion, The second case is provided with an engagement portion with which the claw portion engages, The engagement portion is provided on a side distal to the first case, The partial discharge measuring device according to claim 5, wherein the claw portion is provided at a tip of an extension portion extending from a wall portion of the first case toward the second case so as to engage with the engagement portion provided on the distal side.

7. 7. The partial discharge measuring device according to claim 6, wherein a seal member is fitted between the first case and the second case.

8. The cover member is further included. the second case has an opening for accommodating an object including the partial discharge antenna and the circuit board in the second case; 6. The partial discharge measuring device according to claim 5, wherein the cover member engages with the second case to block the opening of the second case, thereby preventing the contents contained in the second case from protruding outside the second case through the opening of the second case.

9. 2. The partial discharge measuring device according to claim 1, wherein the partial discharge measuring device is attached to a live part of the high voltage equipment, and the partial discharge antenna is disposed at a fixed distance from the live part.

10. The partial discharge measuring device according to claim 9 , wherein the attachment portion is provided on a surface facing the charging portion.

11. The fastener is a cable tie, The attachment portion is a hole portion, The partial discharge measuring device according to claim 1 , wherein the cable tie is attached to the insulating case by being passed through the hole.

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