Power equipment

Abstract

To provide an electric power device that can reduce a work time required for thermal spraying and a work load.SOLUTION: A terminal box 22 that covers a relay connector 32 for wiring connection is provided. The relay connector 32 is fixed using a through-hole 13 formed in a housing 1, and a fixing portion 24 of the terminal box 22 is detachably attached to a fixing seat 29 having a second insertion hole 29a formed therein, the fixing seat 29 being attached around the through-hole 13 on the outer surface of the housing 1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a terminal box structure for connecting / disconnecting a relay connector to a control wiring. [Background technology]

[0002] Automatic voltage regulators (SVRs: Step Voltage Regulators) have been known as power equipment that are installed on high-voltage distribution lines to control voltage fluctuations in the distribution lines (see Non-Patent Document 1 below). An automatic voltage regulator is composed of a transformer with a voltage adjustment tap, a tap changer, and a control unit, and the control unit detects deviations from a preset reference voltage, operates the tap changer, and constantly adjusts the tap voltage to the optimum value.

[0003] About 30 years ago, the construction and installation of distribution line automation systems began, and automatic voltage regulators also began to be required to be able to be connected to these systems for remote control. The requirements for automatic voltage regulators include the ability to measure voltage and current, monitor tap positions, and switch tap voltage up and down, so that voltage can be adjusted remotely. The control unit installed in the automatic voltage regulator performs these functions and is connected to the distribution line automation system. [Prior art documents] [Patent documents]

[0004] [Non-Patent Document 1] Our Focus Products Automatic Voltage Regulators and Actuators -History and Outlook- Internet <url>https: / / www.aichidenki.jp / report / 36 / 36_21.pdf

[0005] The components of each part of the automatic voltage regulator will be explained using Figures 4 to 6. As mentioned above, the automatic voltage regulator is roughly composed of a transformer with voltage adjustment taps, a tap changer, and a control unit. Figure 4 is a front view of automatic voltage regulator B, and Figure 5 is its side view.

[0006] 4 and 5, reference numeral 1 denotes the housing of automatic voltage regulator B, and the voltage adjustment tap transformer and tap changer described above are housed inside housing 1 while immersed in insulating oil. Reference numeral 2 denotes a control unit installed on the outer surface (front) of housing 1, and is connected to a distribution line automation system (not shown) by sending and receiving signals via control signal line 3.

[0007] Reference numeral 4 denotes a cover that closes the top opening of the housing 1, and a high-voltage bushing 5 and a low-voltage bushing 6 that pass through the cover 4 are attached to it. The high-voltage bushing 5 and the low-voltage bushing 6 allow electricity to flow safely between the distribution line and the transformer inside the housing 1. Reference numeral 7 denotes a sight glass attached to the outer surface (front) of the housing 1, which allows the tap position display plate attached to the tap changer inside the housing 1 to be seen from outside the housing 1.

[0008] Reference numeral 8 denotes a heat dissipation fin attached to the outer surface (rear) of the housing 1, which releases heat generated by the automatic voltage regulator into the outside air. Reference numeral 9 denotes a moisture absorbing respirator attached to the air inlet and outlet, which absorbs moisture from the air flowing in and out of the housing 1 to protect the inside of the power equipment from moisture.

[0009] Reference numeral 10 denotes a terminal box attached to the outer surface (front) of the housing 1. Inside the terminal box 10, a relay connector is attached that relays the control wiring that connects the control unit 2 and the tap changer inside the housing 1. The relay connector is attached at a position above the insulating oil surface inside the housing 1.

[0010] Reference numeral 11 denotes a wiring pipe through which control wiring that connects the relay connector and the control unit 2 is passed. Reference numeral 12 denotes a reinforcing member attached to the outer surface (side surface) of the housing 1 in order to improve the strength of the housing 1.

[0011] Fig. 6 is a vertical cross-sectional view showing the internal structure of terminal box 10. In Fig. 6, reference numeral 13 denotes a through hole formed in housing 1, and terminal box 10 is attached to the outer surface of housing 1 by welding or the like so as to close through hole 13.

[0012] The terminal box 10 is composed of a hollow cylindrical tube portion 14, an annular flange 15 provided at the open end (left end in Figure 6) of the tube portion 14, and a lid portion 18 that is attached to the flange 15 by fixing means (bolts and nuts) 17 via a gasket 16 having an opening with the same diameter as the hollow portion of the tube portion 14, and that closes the hollow portion of the tube portion 14.

[0013] A connector fixing member 19 having an insertion hole 19a is attached inside the cylindrical portion 14, and a relay connector 20 for control wiring is fixed inside the cylindrical portion 14 using the connector fixing member 19. A support flange 20a is provided at a midpoint of the relay connector 20, and with the support flange 20a placed against the connector fixing member 19, the support flange 20a and the connector fixing member 19 are connected by fixing means (bolts) 21, whereby the relay connector 20 is fixed to the connector fixing member 19.

[0014] In this state, the left end of the relay connector 20 is inserted through the insertion hole 19a of the connector fixing member 19, and the right end is inserted through the through hole 13 of the housing 1 and advances into the housing 1. In addition, as described above, the wiring pipe 11 is connected to the cylindrical portion 14, and the hollow portion of the cylindrical portion 14 and the inside of the wiring pipe 11 are in communication.

[0015] 4 and 5 inside the cylindrical portion 14 is connected to the left end of the relay connector 20, and the other end of the control wiring, one end of which is connected to the tap changer inside the housing 1, is connected to the right end of the relay connector 20. As a result, a control signal from the control portion 2 is sent to the tap changer via the control wiring and the relay adapter 20, causing the tap changer to operate.

[0016] When connecting or disconnecting the control wiring to the relay connector 20, the cover 18 is removed from the flange 15 of the terminal box 10 by releasing the screwed state of the fixing means 18. Then, the hollow portion of the tubular portion 14 is used to connect the control wiring to the relay connector 20 or to disconnect the control wiring from the relay connector 20.

[0017] After the connection / disconnection of the control wiring and the relay connector 20 is completed, the lid 18 is fixed to the flange 15 by the fixing means 18 to close the hollow portion of the tubular portion 14. The terminal box 10 is used for this purpose. Summary of the Invention [Problem to be solved by the invention]

[0018] Electric power equipment such as those shown in Figures 4 and 5 undergoes rust and corrosion prevention treatment to extend the product life. There are various methods for rust and corrosion prevention treatment, but thermal spraying is widely used as a coating method for corrosion prevention. Thermal spraying methods can be broadly divided into gas thermal spraying and electric thermal spraying, and gas thermal spraying methods include flame thermal spraying and high-velocity flame thermal spraying. Electric thermal spraying methods include arc thermal spraying and plasma thermal spraying.

[0019] Each method has its advantages and disadvantages. For example, arc spraying has the advantages of a high spraying speed, a large amount of material processed per unit time, and low running costs.

[0020] Arc spraying is a method in which a direct current arc discharge is generated at the tips of two continuously fed metal wires (spray material), and the molten metal is blown away with a jet of air. For example, an aluminum wire is used on the positive electrode side and a zinc wire on the negative electrode side to form a pseudo-alloy spray coating.

[0021] An example of thermal spraying work for an automatic voltage regulator as shown in Figures 4 and 5 will be described. The thermal spraying work is carried out with the housing 1 of the automatic voltage regulator B, the cover 4, the control unit 2, the terminal box 10, the heat dissipation fins 8, etc. attached. At this time, the bushings 5 and 6, etc. have been removed, and the housing 1 does not contain the electrical equipment body, insulating oil, etc.

[0022] First, as a preliminary step, the areas that will not receive the metal coating are masked, then an air blasting device is used to spray abrasives, a robot gun is used to abrasive clean the area, and manual guns are used to make corrections.

[0023] Next comes the thermal spraying work. The thermal spraying device melts the wire with an arc and sprays it onto the surface of the area to be sprayed on the automatic voltage regulator B, forming a metal coating. After spraying with a robotic gun, correction spraying is performed with a manual gun, and finally the masking tape is removed, completing the thermal spraying work.

[0024] The above-mentioned thermal spraying work is difficult to perform in high places or narrow places due to the structure of the thermal spraying device. However, in the terminal box 10 shown in Figures 4 and 5, the relay connector 20 is attached to a position above the insulating oil surface inside the housing 1, so the fixing position of the terminal box 10 is limited to the vicinity of the lower part of the cover 4 that closes the upper opening of the housing 1.

[0025] This makes it difficult to spray the high, narrow area between the terminal box 10 and the cover 4 shown in Figure 6. To solve the problem of the high location, the housing 1 can be turned upside down so that the terminal box 10 is positioned at a low location, but this is a heavy workload and takes a long time to complete. Furthermore, this method does not solve the problem of the narrow location.

[0026] The present invention has been made to solve the above problems, and provides an electric power device that can eliminate the difficulty of thermal spraying work by changing the structure of the terminal box. [Means for solving the problem]

[0027] The invention described in claim 1 is an electric power device comprising a terminal box that covers a relay connector for wiring connection, the relay connector being fixed using a through hole formed in a housing, and the terminal box being removably attached to a fixing seat that has a second insertion hole formed therein and is attached around the through hole on the outer surface of the housing.

[0028] The invention described in claim 2 is an electric power equipment characterized in that the base end of the terminal box described in claim 1 is provided with a fixing portion having a first insertion hole formed therein, and is detachably attached to the fixing seat via a second gasket having a third insertion hole formed therein.

[0029] The invention described in claim 3 is an electric power device characterized in that the relay connector described in claim 2 has one end positioned within the terminal box through the through hole, the second insertion hole, the third insertion hole, and the first insertion hole.

[0030] The invention of claim 4 is an electric power device characterized in that the relay connector of any one of claims 1 to 3 is fixed to the inner surface of the housing by utilizing a support flange. [Effects of the Invention]

[0031] According to the invention of claim 1, the terminal box is detachable from the housing, so the terminal box and the housing can be thermally sprayed separately with the terminal box removed from the housing, which reduces the time and effort required for the thermal spraying work on the terminal box and the housing.

[0032] According to the invention of claim 2, the terminal box can be easily attached and detached from the housing, which simplifies the work of removing the terminal box and attaching the terminal box after the thermal spraying is completed.

[0033] According to the invention of claim 3, the relay connector is disposed in a state where it is advanced into the housing of the terminal box, which facilitates the operation of connecting / disconnecting the relay connector to / from the control wiring.

[0034] According to the invention as set forth in claim 4, the relay connector can be easily attached to the housing. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a front view showing an example of an electric power device according to the present invention. [Figure 2] 1 is a side view showing an example of an electric power device according to the present invention. [Figure 3] 1 is a side view showing a terminal box constituting the electric power device of the present invention. FIG. [Figure 4] FIG. 1 is a front view showing an example of a conventional electric power device. [Figure 5] FIG. 1 is a side view showing an example of a conventional electric power device. [Figure 6] FIG. 10 is a side view showing a terminal box constituting a conventional electric power device. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 3. Fig. 1 is a front view showing an automatic voltage regulator A as an example of electric power equipment according to the present invention, and Fig. 2 is a side view thereof. Note that the automatic voltage regulator A shown in Figs. 1 and 2 has almost the same configuration as the conventional automatic voltage regulator B shown in Figs. 4 and 5, and therefore components identical to those of the automatic voltage regulator B will be described using the same reference numerals.

[0037] In Figures 1 and 2, 1 is the housing of automatic voltage regulator A, and inside housing 1, a transformer with voltage adjustment taps and a tap changer are housed immersed in insulating oil. 2 is the control unit installed on the outer surface (front) of housing 1, and 4 is the cover of housing 1. 5 is a high-voltage bushing, and 6 is a low-voltage bushing. 7 is a sight glass for checking the tap position display plate inside housing 1.

[0038] Reference numeral 8 denotes a heat dissipation fin attached to the outer surface (rear surface) of the housing 1, 9 denotes a moisture absorbing respirator attached to the air inlet / outlet, and 11 denotes a wiring pipe through which control wiring that connects the relay connector and the control unit 2 is routed. Reference numeral 22 denotes a terminal box attached to the outer surface (front surface) of the housing 1, which is a characteristic part of the present invention.

[0039] Fig. 3 shows the structure of terminal box 22. Terminal box 22 according to the present invention is composed of a hollow cylindrical tube portion 23, a fixing portion 24 provided at the base end (right end in Fig. 3) of tube portion 23, extending in a direction to close the hollow portion and having a first insertion hole 24a at its center, an annular flange 25 provided at the open end (left end in Fig. 3) of tube portion 23, and a lid portion 28 attached to flange 25 by first fixing means (bolts and nuts) 27 via a first gasket 26 having an opening with the same diameter as the hollow portion of tube portion 23, and closing the hollow portion of tube portion 23.

[0040] Reference numeral 29 denotes a fixing seat which forms a second insertion hole 29a having approximately the same diameter as the through hole 13 of the housing 1 and is fixed to the outer surface of the housing 1 by welding or the like in a positional relationship in which the second insertion hole 29a and the through hole 13 of the housing 1 match. Reference numeral 30 denotes a second gasket which has a third insertion hole 30a which approximately matches the first insertion hole 24a, and which is interposed between the fixing portion 29 and the fixing seat 25 and fixes the fixing portion 24 to the fixing seat 29 by a third fixing means 31.

[0041] Reference numeral 32 denotes a relay connector that is attached by fixing a support flange 33 to the inner surface of the housing 1 using a second fixing means 34 within the through hole 13 formed in the housing 1, and is positioned within the tubular portion 23 by inserting it from the through hole 13 of the housing 1 through the second insertion hole 29a of the fixing seat 29, the third insertion hole 30a of the second gasket 30, and the first insertion hole 24a of the fixing portion 24.

[0042] The wiring pipe 11 is connected to the cylindrical portion 23, and the inside of the wiring pipe 11 communicates with the hollow portion of the cylindrical portion 22. The wiring pipe 11 consists of an upper wiring pipe 11a and a lower wiring pipe 11b, which are connected to each other by connecting flanges 11a1 and 11b1.

[0043] 1 and 2 outside the housing 1, the other end of the control wiring is connected to the relay connector 32, and the other end of the control wiring is connected to the tap changer inside the housing 1. As a result, a control signal from the control unit 2 is sent to the tap changer through the control wiring and the relay adapter 32, causing the tap changer to operate.

[0044] When connecting / disconnecting the control wiring to the relay connector 32, the cover 28 of the terminal box 22 is removed by releasing the screwed state of the first fixing means 27. Then, the hollow portion of the tubular portion 23 is used to connect or disconnect the control wiring to the relay connector 32.

[0045] After the connection / disconnection between the control wiring and the relay connector 32 is completed, the cover 28 is again fixed to the flange 25 by the first fixing means 27, thereby closing the hollow portion of the tubular portion 23.

[0046] When thermal spraying is performed on the terminal box 22 used in this manner for the purpose of rust and corrosion prevention, the spraying is performed with the terminal box 22 removed from the housing 1. Specifically, the terminal box 22 is removed from the fixing seat 29 by releasing the screwed state of the third fixing means 31 shown in FIG.

[0047] At the same time, the upper wiring pipe 11a and the lower wiring pipe 11b connected to the cylindrical portion 23 are separated by releasing the connection between the connecting flanges 11a1 and 11b1. As a result, the terminal box 22 can be completely removed from the housing 1.

[0048] The separated terminal box 22 is sprayed separately using a thermal spraying device. Separately, the housing 1 from which the terminal box 22 has been removed, and the control unit 2 attached to the housing 1, etc. are sprayed separately. Once the spraying of the necessary parts is completed, the terminal box 22 is reattached to the housing 1. The attachment method is the reverse of the procedure used for separation. That is, the fixing part 24 is fixed to the fixing seat 29 again by the third fixing means 31, and the upper wiring pipe 11a and the lower wiring pipe 11b are attached to the housing 1 by connecting them using the connecting flanges 11a1 and 11b1.

[0049] According to this method, there is no need to spray the narrow portion between the terminal box 22 and the cover 4 shown in Figure 3 at a high location, nor is there any need to place the narrow portion at a low location by turning the housing 1 upside down, so it is possible to shorten the time required for spraying the terminal box 22, housing 1, etc., and reduce the burden of the work.

[0050] As described above, according to the electric power equipment of the present invention, by changing the structure of the terminal box 22 to be detachable from the housing 1, the time required for spraying the terminal box 22, the housing 1, etc. can be shortened and the workload can be reduced.

[0051] In the above-described embodiment, an automatic voltage regulator has been described as an example of the electric power equipment to which the present invention is applied, but the electric power equipment of the present invention is not limited to automatic voltage regulators, and it goes without saying that the present invention is applicable to any electric power equipment equipped with a terminal box. [Industrial Applicability]

[0052] It can be applied to any electric power device that has a terminal box. [Explanation of symbols]

[0053] 1 chassis 2. Control section 3 Control signal line 4 Cover 5 High-pressure bushing 6 Low Pressure Bushing 7. Peephole 8 Heat dissipation fins 9 Hygroscopic respirator 10,22 Terminal box 11 Wiring piping 11a Upper wiring piping 11b Lower wiring piping 11a1, 11b1 Connection flange 12 Reinforcing member 13 Through hole 14,23 Cylinder part 15,25 flange 16 Gasket 17,21 Fixing means 18,28 Lid 19 Connector fixing member 19a Insertion hole 20,32 relay connector 20a, 33 Support flange 24 Fixed part 24a First insertion hole 26 First Gasket 27 First fixing means 29 Fixed seat 29a Second insertion hole 30 Second Gasket 30a Third insertion hole 31 Third fixing means 34 Secondary Fixing Means A, B Power equipment (automatic voltage regulator)< / url>

Claims

1. An electric power device comprising a terminal box that covers a relay connector for wiring connection, the relay connector being fixed by utilizing a through hole formed in a housing, and the terminal box being detachably attached to a fixing seat that has a second insertion hole formed therein and is attached around the through hole on the outer surface of the housing.

2. The electric power equipment according to claim 1, characterized in that the terminal box has a fixing portion having a first insertion hole formed at a base end thereof, and is detachably attached to the fixing seat via a second gasket having a third insertion hole formed therein.

3. 3. The electric power device according to claim 2, wherein one end of the relay connector is disposed inside the terminal box through the through hole, the second insertion hole, the third insertion hole, and the first insertion hole.

4. 4. The electric power device according to claim 1, wherein the relay connector is fixed to an inner surface of the housing by utilizing a support flange.

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