A grounding connection structure for voltage transformer and use method thereof

Abstract

The present invention provides a grounding connection structure for a voltage transformer and a method for using the same. A first connecting rod is installed through a fixed seat, one end of the first connecting rod is fixedly connected to the middle top corner of an L-shaped connecting plate used to drive the rotation thereof, the bottom corner of the L-shaped connecting plate is hingedly connected to a sliding lock plate used to drive the rotation thereof through a first pin shaft, and the sliding lock plate cooperates with a positioning pin fixed on the outer wall of the fixed seat; a second connecting rod is installed at the top corner of the L-shaped connecting plate, the second connecting rod and the other end of the first connecting rod are fixed with a first connecting plate, the top of the first connecting plate is hingedly connected to a second connecting plate through a second pin shaft, and the top of the second connecting plate is hingedly connected to an ear plate on the back of a contact plate through a third pin shaft. This connection structure can well solve the problem of power supply to the equipment after the voltage transformer is overhauled, avoiding the situation that the secondary terminals N and X are not restored to ground due to human factors; and can effectively improve the grounding reliability of the N and X connecting plates.

Description

Technical Field

[0001] The invention relates to the field of grounding devices, and in particular to a grounding connection structure for a voltage transformer and a use method thereof. Background Art

[0002] Capacitor voltage transformer products are electrical equipment installed outdoors. They are used to convert primary high voltage into secondary low voltage signals that are easy to measure. They are key equipment for electricity metering. Failure directly affects the economic benefits of power plants. The secondary low voltage signal is integrated on the secondary wiring board in the secondary outlet box. The grounding terminal of the capacitor voltage divider loop is led out from the N terminal, and the grounding terminal of the electromagnetic unit loop is led out from the X terminal. During normal operation, the two terminals need to be firmly grounded. If they are not grounded, it will cause a discharge fault at the secondary terminal.

[0003] During the power outage maintenance of the voltage transformer, the staff needs to disconnect and ground the N, X and other terminals one by one when conducting tests, and restore the connections one by one when the test is completed.

[0004] The existing technology is highly dependent on the working status and working ability of the maintenance staff. When the staff is in a bad state or is not familiar with the work process, they may forget or miss the restoration wiring operation of the N and X grounding terminals of the equipment, which may cause the equipment to be powered on and run without being grounded. Because the door of the equipment outlet box is closed, the grounding fault of the N and X terminals of the equipment cannot be observed, and the fault cannot be discovered in time from the background monitoring device within a short period of time after the N and X terminals are grounded through the fault arc after power is supplied. The fault is often not discovered until the N and X terminals of the secondary wiring board have been carbonized, leaked oil, and the voltage is abnormal due to the high temperature of the arc, causing the fault to expand. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a grounding connection structure for a voltage transformer and a method for use. This connection structure can effectively solve the problem that after the voltage transformer is repaired, the secondary terminals N and X are not restored to ground before power is supplied to the equipment, which is caused by human factors. It can effectively improve the grounding reliability of the N and X connecting pieces and greatly reduce the risk of the N and X connecting pieces not being reliably grounded during operation.

[0006] In order to realize the above-mentioned technical features, the purpose of the present invention is realized as follows: a grounding connection structure for a voltage transformer and a method of use, comprising a fixed seat, a first connecting rod is installed through the fixed seat, one end of the first connecting rod is fixedly connected to the middle top corner of an L-shaped connecting plate used to drive the rotation thereof, the bottom corner of the L-shaped connecting plate is hingedly connected to a sliding locking plate used to drive the rotation thereof through a first pin shaft, the sliding locking plate cooperates with a positioning pin fixed on the outer wall of the fixed seat; a second connecting rod is installed at the top corner of the L-shaped connecting plate, the other end of the second connecting rod and the first connecting rod are fixed with a first connecting plate, the top end of the first connecting plate is hingedly connected to the second connecting plate through a second pin shaft, and the top end of the second connecting plate is hingedly connected to the ear plate on the back of the contact piece through a third pin shaft.

[0007] The fixing seat adopts a U-shaped structure. During installation, the bottom plate of the U-shaped structure is fixedly installed on the bottom plate of the secondary terminal box.

[0008] A first hinge hole for passing the first connecting rod is processed between the two vertical plates of the U-shaped structure, and a second hinge hole for installing a positioning pin is arranged at the diagonal end of the first hinge hole.

[0009] The contact piece is made of a metal sheet, and is processed with a first wiring hole for matching with the N terminal, a second wiring hole for matching with the X terminal, and a third wiring hole for matching with the ground terminal.

[0010] The ear plate is processed with a third hinge hole for matching with the third pin shaft.

[0011] One end of the second connecting plate is processed with a fourth hinge hole for matching with the third pin shaft, and the other end of the second connecting plate is processed with a fifth hinge hole for matching with the second pin shaft.

[0012] A sixth hinge hole for cooperating with the second pin is processed at one end of the first connecting plate, and a seventh hinge hole and an eighth hinge hole for cooperating with the second connecting rod and the first connecting rod are respectively processed at the other end of the first connecting plate.

[0013] The corner portion of the L-shaped connecting plate is provided with a ninth hinge hole for cooperating with the first connecting rod, the top corner portion of the L-shaped connecting plate is provided with a twelfth hinge hole for cooperating with the second connecting rod, and the bottom corner portion of the L-shaped connecting plate is provided with a tenth hinge hole for cooperating with the first pin shaft.

[0014] The end of the sliding lock plate is processed with an eleventh hinge hole for matching with the first pin shaft, the sliding lock plate is processed with a sliding groove for matching with the positioning pin, and a tail hook is arranged at one end of the tail of the sliding lock plate.

[0015] A method for using a grounding connection structure for a voltage transformer comprises the following steps:

[0016] Step 1: Installation of ground connection structure:

[0017] The ground connection structure is fixedly installed inside the secondary terminal box of the voltage transformer, and the first wiring hole, the second wiring hole and the third wiring hole on the contact piece are respectively connected to the N terminal, the X terminal and the ground terminal;

[0018] Step 2: Normal operation status of voltage transformer:

[0019] When the voltage transformer is operating normally, the contact piece of the grounding connection structure is attached to the secondary wiring board of the voltage transformer, the N terminal and the X terminal are connected to the corresponding wiring holes in the contact piece, and the remaining third wiring hole on the contact piece is connected to the ground;

[0020] Step 3: When the voltage transformer equipment is taken out of operation for maintenance:

[0021] Disconnect the connection between the secondary wiring board of the voltage transformer and the contact piece, then rotate the first connection plate and fold the second connection plate, fold the contact piece by the second connection plate, and at the same time drive the second connecting rod by the rotation of the first connection plate, drive the L-shaped connection plate by the second connecting rod, and synchronously drive the sliding lock piece to slide along the positioning pin by the L-shaped connection plate, so that the tail end of the sliding lock piece finally extends out of the secondary terminal box, thereby preventing the box door from closing;

[0022] Through the operation in step three, when the N terminal and X terminal of the voltage transformer equipment are not grounded through the contact piece, the box door cannot be closed, so that the staff and inspectors can timely understand the internal wiring status of the secondary terminal box, avoid the occurrence of ungrounded power transmission, which leads to the expansion of faults, improve the reliability of equipment operation, and fundamentally solve the equipment operation risk caused by the ungrounded voltage transformer equipment.

[0023] The present invention has beneficial effects:

[0024] 1. The connection structure of the present invention can effectively solve the problem that after the voltage transformer is repaired, the secondary terminals N and X are not restored to ground before the equipment is powered on due to human factors; it can effectively improve the grounding reliability of the N and X connecting pieces, and greatly reduce the risk of the N and X connecting pieces not being reliably grounded during operation.

[0025] 2. The above-mentioned U-shaped structure ensures the stability and reliability of the fixed installation of the fixing base, thereby ensuring that the entire grounding connection structure can be reliably fixed inside the secondary terminal box.

[0026] 3. The U-shaped structure can be used to install and fix the L-shaped connecting plate and the sliding locking piece.

[0027] 4. The above-mentioned contact piece can be used to reliably connect with the N terminal, X terminal and ground terminal on the secondary wiring board.

[0028] 5. The second connecting plate can facilitate the subsequent disconnection of the contact piece from the secondary wiring board, and ensure that it can adapt to the requirements of different installation positions.

[0029] 6. The first connecting plate can realize power transmission, so that the first connecting plate can drive the L-shaped connecting plate, and the L-shaped connecting plate can drive the subsequent sliding locking plate.

[0030] 7. The L-shaped connecting plate can be used to transmit power, thereby ensuring that the first connecting plate can drive the L-shaped connecting plate, and then the L-shaped connecting plate drives the sliding locking plate, thereby ensuring that the sliding locking plate can be extended out of the secondary terminal box later.

[0031] 8. The above-mentioned sliding lock piece ensures that it can slide along the slide groove under the driving action of the L-shaped connecting plate, and then the tail hook of the sliding lock piece extends out of the secondary terminal box, ensuring that the door of the secondary terminal box is effectively blocked during normal maintenance of the equipment, and the box door cannot be closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] Figure 1 It is a left view of the present invention.

[0034] Figure 2 It is the front view of the present invention.

[0035] Figure 3 It is the right view of the present invention.

[0036] Figure 4 It is a structural diagram of the connection between the ear plate and the contact sheet of the present invention.

[0037] Figure 5 It is a structural diagram of the second connecting plate of the present invention.

[0038] Figure 6 It is a structural diagram of the first connecting plate of the present invention.

[0039] Figure 7 It is a side view of a fixing seat of the present invention.

[0040] Figure 8 It is a structural diagram of the L-shaped connecting plate of the present invention.

[0041] Fig. 9 It is a structural diagram of the sliding lock piece of the present invention.

[0042] Fig.10It is a front view of the matching connection between the ground connection structure of the present invention and the secondary wiring board in the operating state.

[0043] Fig.11 It is a side view of the matching connection between the ground connection structure of the present invention and the secondary wiring board in the operating state.

[0044] Fig.12 It is a side view of the matching connection between the ground connection structure of the present invention and the secondary wiring board in the test state.

[0045] Fig.13 (a) (b) (c) (d) are operation process diagrams of the ground connection structure and the secondary terminal board of the present invention during maintenance.

[0046] In the figure: contact piece 1, third pin shaft 2, ear plate 3, second connecting plate 4, second pin shaft 5, first connecting plate 6, second connecting rod 7, L-shaped connecting plate 8, first connecting rod 9, first pin shaft 10, fixing seat 11, sliding locking piece 12, positioning pin 13, secondary terminal box 14, secondary wiring board 15, N terminal 16, X terminal 17, grounding terminal 18;

[0047] The first wiring hole 101, the second wiring hole 102, the third wiring hole 103, the third hinge hole 301, the fourth hinge hole 401, the fifth hinge hole 402, the sixth hinge hole 601, the seventh hinge hole 602, the eighth hinge hole 603, the twelfth hinge hole 801, the twelfth hinge hole 802, the tenth hinge hole 803, the eleventh hinge hole 1201, the slide groove 1202, and the tail hook 1203. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0049] Embodiment 1:

[0050] Explanation of terms in the present invention:

[0051] Secondary terminals: Multiple outgoing terminals on the low-voltage side of the voltage transformer product.

[0052] N terminal: One of the secondary terminals of voltage transformer products, used for grounding the end of the capacitive voltage divider loop.

[0053] X terminal: One of the secondary terminals of voltage transformer products, used for grounding the end of the electromagnetic unit loop.

[0054] Secondary terminal board: An insulating board with integrated voltage transformer secondary terminals, arranged in the secondary outlet box.

[0055] Secondary terminal box: The box body on the secondary side of the voltage transformer, the terminal box is equipped with a box door.

[0056] See also Figure 1-13 A grounding connection structure for a voltage transformer includes a fixed seat 11, a first connecting rod 9 is installed on the fixed seat 11, one end of the first connecting rod 9 is fixedly connected to the middle top corner of an L-shaped connecting plate 8 for driving the rotation thereof, the bottom corner of the L-shaped connecting plate 8 is hingedly connected to a sliding locking piece 12 for driving the rotation thereof through a first pin shaft 10, and the sliding locking piece 12 cooperates with a positioning pin 13 fixed on the outer wall of the fixed seat 11; a second connecting rod 7 is installed at the top corner of the L-shaped connecting plate 8, the other end of the second connecting rod 7 and the first connecting rod 9 is fixed with a first connecting plate 6, the top end of the first connecting plate 6 is hingedly connected to a second connecting plate 4 through a second pin shaft 5, and the top end of the second connecting plate 4 is hingedly connected to an ear plate 3 on the back of a contact piece 1 through a third pin shaft 2. The connection structure of the present invention can effectively solve the problem of power supply to the equipment after the voltage transformer is repaired and the secondary terminals N and X are not grounded due to human factors; it can effectively improve the grounding reliability of the N and X connecting pieces and greatly reduce the risk of the N and X connecting pieces not being reliably grounded.

[0057] Furthermore, the fixing base 11 adopts a U-shaped structure, and during installation, the bottom plate of the U-shaped structure is fixedly mounted on the bottom plate of the secondary terminal box 14. The U-shaped structure ensures the stability and reliability of the fixing base 11, thereby ensuring that the entire grounding connection structure can be reliably fixed inside the secondary terminal box 14.

[0058] Furthermore, a first hinge hole 1101 is processed between the two vertical plates of the U-shaped structure for passing the first connecting rod 9, and a second hinge hole 1102 is provided at the diagonal end of the first hinge hole 1101 for installing the positioning pin 13. The U-shaped structure can realize the installation and fixation of the L-shaped connecting plate and the sliding locking plate.

[0059] Furthermore, the contact piece 1 is made of a metal sheet, and is processed with a first wiring hole 101 for matching with the N terminal 16, a second wiring hole 102 for matching with the X terminal 17, and a third wiring hole 103 for matching with the ground terminal 18. The contact piece 1 can be used to reliably connect with the N terminal 16, the X terminal 17 and the ground terminal on the secondary wiring board 15.

[0060] Furthermore, the ear plate 3 is processed with a third hinge hole 301 for matching with the third pin shaft 2. The contact piece 1 and the second connecting plate 4 can be conveniently installed and connected through the ear plate 3.

[0061] Furthermore, a fourth hinge hole 401 for cooperating with the third pin shaft 2 is processed at one end of the second connecting plate 4, and a fifth hinge hole 402 for cooperating with the second pin shaft 5 is processed at the other end of the second connecting plate 4. The second connecting plate 4 can facilitate the subsequent disconnection of the contact piece 1 and the secondary wiring board 15, and ensure that it can meet the requirements of different installation positions.

[0062] Furthermore, a sixth hinge hole 601 for cooperating with the second pin shaft 5 is processed at one end of the first connecting plate 6, and a seventh hinge hole 602 and an eighth hinge hole 603 for cooperating with the second connecting rod 7 and the first connecting rod 9 are respectively processed at the other end of the first connecting plate 6. The power transmission can be realized through the above-mentioned first connecting plate 6, so that it is convenient to drive the L-shaped connecting plate 8 through the first connecting plate 6, and then drive the subsequent sliding lock plate 12 through the L-shaped connecting plate 8.

[0063] Furthermore, the corner of the L-shaped connecting plate 8 is provided with a ninth hinge hole 802 for cooperating with the first connecting rod 9, the top corner of the L-shaped connecting plate 8 is provided with a twelfth hinge hole 801 for cooperating with the second connecting rod 7, and the bottom corner of the L-shaped connecting plate 8 is provided with a tenth hinge hole 803 for cooperating with the first pin 10. The L-shaped connecting plate 8 can be used to transmit power, thereby ensuring that the L-shaped connecting plate 8 can be driven by the first connecting plate 6, and then the sliding locking plate 12 is driven by the L-shaped connecting plate 8, thereby ensuring that the sliding locking plate 12 can be extended out of the secondary terminal box 14 later.

[0064] Furthermore, the end of the sliding lock piece 12 is processed with an eleventh hinge hole 1201 for matching with the first pin shaft 10, the sliding lock piece 12 is processed with a slide groove 1202 for matching with the positioning pin 13, and a tail hook 1203 is provided at one end of the tail of the sliding lock piece 12. The above-mentioned sliding lock piece 12 is ensured to slide along the slide groove 1202 under the driving action of the L-shaped connecting plate 8, and then the tail hook 1203 of the sliding lock piece 12 is extended out of the secondary terminal box 14, ensuring that the door of the secondary terminal box 14 is effectively blocked during the normal maintenance of the equipment, and the box door cannot be closed, so that the staff and inspectors can timely understand the internal wiring status of the outlet box, avoid the occurrence of ungrounded power transmission, and then expand the fault to improve the reliability of equipment operation, and fundamentally solve the equipment operation risks caused by N terminal 16, X terminal 17 and ungrounded.

[0065] Embodiment 2:

[0066] See also Fig.13 , a method for using a grounding connection structure for a voltage transformer, comprising the following steps:

[0067] Step 1: Installation of ground connection structure:

[0068] The ground connection structure is fixedly installed inside the secondary terminal box 14 of the voltage transformer, and the first wiring hole 101, the second wiring hole 102 and the third wiring hole 103 on the contact piece 1 are respectively connected to the N terminal 16, the X terminal 17 and the ground terminal 18;

[0069] Step 2: Normal operation status of voltage transformer:

[0070] When the voltage transformer is operating normally, the contact piece 1 of the ground connection structure is attached to the secondary wiring board 15 of the voltage transformer, the N terminal 16 and the X terminal 17 are connected to the corresponding wiring holes in the contact piece 1, and the remaining third wiring hole 103 on the contact piece 1 is connected to the ground;

[0071] Step 3: When the voltage transformer equipment is taken out of operation for maintenance:

[0072] Disconnect the connection between the secondary terminal board 15 of the voltage transformer and the contact piece 1, then rotate the first connection plate 6, and fold the second connection plate 4, fold the contact piece 1 through the second connection plate 4, and at the same time drive the second connecting rod 7 through the rotation of the first connection plate 6, drive the L-shaped connection plate 8 through the second connecting rod 7, and synchronously drive the sliding lock piece 12 to slide along the positioning pin 13 through the L-shaped connection plate 8, and finally make the tail end of the sliding lock piece 12 extend out of the secondary terminal box 14, thereby preventing the box door from closing;

[0073] By operating in step three, when the N terminal 16 and the X terminal 17 of the voltage transformer equipment are not grounded through the contact piece 1, the box door cannot be closed, so that the staff and inspectors can timely understand the internal wiring conditions of the secondary terminal box 14, avoid the occurrence of ungrounded power transmission, which leads to the expansion of faults, improve the reliability of equipment operation, and fundamentally solve the equipment operation risks caused by the ungrounded voltage transformer equipment.

Claims

1. A method for using a grounding connection structure for a voltage transformer, the grounding connection structure for a voltage transformer comprising a fixing seat (11), a first connecting rod (9) being installed through the fixing seat (11), one end of the first connecting rod (9) being fixedly connected to the middle top corner of an L-shaped connecting plate (8) for driving the first connecting rod to rotate, the bottom corner of the L-shaped connecting plate (8) being hingedly connected to a sliding locking plate (12) for driving the first connecting plate to rotate via a first pin shaft (10), the sliding locking plate (12) being matched with a positioning pin (13) fixed on the outer wall of the fixing seat (11); a second connecting rod (7) being installed at the top corner of the L-shaped connecting plate (8), the other end of the second connecting rod (7) and the first connecting rod (9) being fixed with a first connecting plate (6), the top end of the first connecting plate (6) being hingedly connected to a second connecting plate (4) via a second pin shaft (5), the top end of the second connecting plate (4) being hingedly connected to an ear plate (3) on the back of a contact plate (1) via a third pin shaft (2); The fixing seat (11) adopts a U-shaped structure. During installation, the bottom plate of the U-shaped structure is fixedly mounted on the bottom plate of the secondary terminal box (14); A first hinge hole (1101) for passing the first connecting rod (9) is formed between the two vertical plates of the U-shaped structure, and a second hinge hole (1102) for installing a positioning pin (13) is provided at the diagonal end of the first hinge hole (1101); The contact piece (1) is made of a metal sheet, and is processed with a first wiring hole (101) for matching with an N terminal (16), a second wiring hole (102) for matching with an X terminal (17), and a third wiring hole (103) for matching with a ground terminal (18). One end of the first connecting plate (6) is processed with a sixth hinge hole (601) for cooperating with the second pin shaft (5), and the other end of the first connecting plate (6) is processed with a seventh hinge hole (602) and an eighth hinge hole (603) for cooperating with the second connecting rod (7) and the first connecting rod (9), respectively; The L-shaped connecting plate (8) is provided with a ninth hinge hole (802) at a corner portion thereof for cooperating with the first connecting rod (9), the top corner portion thereof is provided with a twelfth hinge hole (801) for cooperating with the second connecting rod (7), and the bottom corner portion thereof is provided with a tenth hinge hole (803) for cooperating with the first pin shaft (10); The end of the sliding lock plate (12) is processed with an eleventh hinge hole (1201) for cooperating with the first pin shaft (10), the sliding lock plate (12) is processed with a slide groove (1202) for cooperating with the positioning pin (13), and a tail hook (1203) is provided at one end of the tail of the sliding lock plate (12); It is characterized in that The method of use comprises the following steps: Step 1: Installation of ground connection structure: The ground connection structure is fixedly mounted inside the secondary terminal box (14) of the voltage transformer, and the first wiring hole (101), the second wiring hole (102) and the third wiring hole (103) on the contact piece (1) are respectively connected to the N terminal (16), the X terminal (17) and the ground terminal (18); Step 2: Normal operation status of voltage transformer: When the voltage transformer operates normally, the contact piece (1) of the ground connection structure is fitted with the secondary wiring board (15) of the voltage transformer, the N terminal (16) and the X terminal (17) are connected to the corresponding wiring holes in the contact piece (1), and the remaining third wiring hole (103) on the contact piece (1) is connected to the ground; Step 3: When the voltage transformer equipment is taken out of operation for maintenance: The connection between the secondary terminal board (15) of the voltage transformer and the contact piece (1) is disconnected, and the first connecting plate (6) is rotated and the second connecting plate (4) is folded, and the contact piece (1) is folded by the second connecting plate (4), and at the same time, the second connecting rod (7) is driven by the rotation of the first connecting plate (6), and the L-shaped connecting plate (8) is driven by the second connecting rod (7), and the sliding lock piece (12) is synchronously driven by the L-shaped connecting plate (8) to slide along the positioning pin (13), and finally the tail end of the sliding lock piece (12) extends out of the secondary terminal box (14), thereby preventing the box door from closing; By operating in step 3, when the N terminal (16) and the X terminal (17) of the voltage transformer device are not grounded through the contact piece (1), the box door cannot be closed, so that the staff and the inspector can timely understand the internal wiring condition of the secondary terminal box (14), avoid the situation of power transmission without grounding, which would cause the expansion of the fault, improve the reliability of equipment operation, and fundamentally solve the equipment operation risk caused by the voltage transformer device not being grounded.

2. The method for using a grounding connection structure for a voltage transformer according to claim 1, characterized in that: The ear plate (3) is machined with a third hinge hole (301) for cooperating with the third pin shaft (2).

3. The method for using a grounding connection structure for a voltage transformer according to claim 2, characterized in that: One end of the second connecting plate (4) is processed with a fourth hinge hole (401) for cooperating with the third pin shaft (2), and the other end of the second connecting plate (4) is processed with a fifth hinge hole (402) for cooperating with the second pin shaft (5).

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