CN216598716U - Visual inspection device for moving and static contacts of grounding knife switch of medium-voltage alternating-current distribution board - Google Patents
Visual inspection device for moving and static contacts of grounding knife switch of medium-voltage alternating-current distribution board Download PDFInfo
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- CN216598716U CN216598716U CN202122768981.2U CN202122768981U CN216598716U CN 216598716 U CN216598716 U CN 216598716U CN 202122768981 U CN202122768981 U CN 202122768981U CN 216598716 U CN216598716 U CN 216598716U
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Abstract
The utility model discloses a visual inspection device for moving and static contacts of a grounding switch of a medium-voltage alternating-current distribution board, wherein an electric medium-voltage alternating-current distribution board cabinet comprises a cabinet body and a door matched with the cabinet body, the cabinet body comprises a first side plate, a second side plate and a third side plate, the third side plate is arranged opposite to the door, and the cabinet body is internally provided with the grounding switch; the visual inspection device comprises a first mirror piece, a second mirror piece and a third mirror piece, wherein the first mirror piece is installed on the inner side of the first side plate and is arranged opposite to the grounding switch, the second mirror piece is installed on the inner side of the second side plate and is arranged opposite to the grounding switch, and the third mirror piece is installed on the inner side of the third side plate and is arranged opposite to the grounding switch. A mirror surface piece is selected according to a mirror surface reflection principle, and the contact condition of three-phase movable and fixed contacts of the grounding disconnecting link can be visually observed, so that the problem that the engagement condition of the movable and fixed contacts of the grounding disconnecting link cannot be directly observed is thoroughly solved, the safe and stable operation of electric medium-voltage alternating-current distribution board equipment is ensured, and the power supply reliability of a plant power supply system of a nuclear power plant is improved.
Description
Technical Field
The utility model relates to the technical field of nuclear power, in particular to a visual inspection device for moving and static contacts of a grounding knife switch of a medium-voltage alternating-current distribution board.
Background
At present, the grounding switch of a medium-voltage alternating-current distribution board produced by most of domestic manufacturers cannot directly observe the contact and occlusion condition of a movable contact and a static contact of the grounding switch through a glass rear window due to the shielding of parts such as an internal insulation supporting piece and the like, and can only indirectly observe the switching-on and switching-off conditions of the grounding switch through a front chamber grounding switch indication mechanical transmission mechanism. Therefore, when the grounding disconnecting link is switched on and off to indicate that the mechanical transmission mechanism breaks down, the situation that an operator switches on with a grounding switch can be caused due to the fact that whether the moving contact and the static contact are thoroughly separated or not can not be determined, and therefore major accidents of three-phase short circuit of a power supply can occur, and major safety risks such as equipment damage and personnel injury exist.
In view of the experience feedback that the power transmission of the medium-voltage switch causes explosion due to short circuit grounding of the outlet bin because the grounding switch is not switched off, the direct observation of the meshing condition of the movable contact and the fixed contact of the grounding switch through the rear view window is particularly emphasized. Before the method, various attempts of expanding a rear window, indicating the opening and closing position, improving a transmission mechanism, arranging and adjusting internal parts of a cabinet and the like are made, and the problem that the movable and static contacts of the ground knife can be directly observed cannot be effectively solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a visual inspection device for movable and static contacts of a grounding switch of a medium-voltage alternating-current distribution board.
The technical scheme adopted by the utility model for solving the technical problem is as follows: constructing a visual inspection device for movable and static contacts of a grounding switch of a medium-voltage alternating-current distribution board, which is suitable for an electric medium-voltage alternating-current distribution board cabinet, wherein the electric medium-voltage alternating-current distribution board cabinet comprises a cabinet body and a door matched with the cabinet body, the cabinet body comprises a first side plate and a second side plate which are oppositely arranged in parallel, and a third side plate connecting the first side plate and the second side plate, the third side plate is oppositely arranged with the door, an inner cavity of the cabinet body forms an accommodating space, and the grounding switch is arranged in the accommodating space; the visual inspection device for the movable and fixed contacts of the grounding knife switch of the medium-voltage alternating-current distribution board comprises a first mirror surface piece, a second mirror surface piece and a third mirror surface piece, wherein the first mirror surface piece is detachably mounted on the inner side of the first side plate and is arranged opposite to the grounding knife switch;
the first mirror surface piece, the second mirror surface piece and the third mirror surface piece are mirror surface stainless steel, or the first mirror surface piece, the second mirror surface piece and the third mirror surface piece are mirror surface brass.
Preferably, the first mirror surface piece is a plate-shaped structure, and four first mounting holes are formed in the first mirror surface piece, so that a first fastener penetrates through the first mounting holes to be fixed to the inner side of the first side plate.
Preferably, the second mirror surface element is a plate-shaped structure, and four second mounting holes are formed in the second mirror surface element, so that a second fastening element can be inserted into the second mounting holes and fixed to the inner side of the second side plate.
Preferably, the third mirror surface element is a plate-shaped structure, and four third mounting holes are formed in the third mirror surface element, so that a third fastening element can be inserted into the fourth mounting holes and fixed to the inner side of the third side plate.
Preferably, the first fastener, the second fastener and the third fastener are rivets.
Preferably, the lengths of the first mirror surface piece and the second mirror surface piece are both 220-230mm, and the width is 180-190 mm.
Preferably, the length of the third mirror piece is 170-.
The implementation of the utility model has the following beneficial effects: this visual inspection device of medium voltage alternating current distribution board earthing switch sound contact adopts the mirror surface reflection of light principle through innovatively, chooses the mode that mirror surface spare is fixed to the interior panel of dish cabinet for use, under the circumstances of guaranteeing to keep safe distance with electrified body, observe the earthing switch three-phase sound contact condition directly perceivedly to thoroughly solve the unable direct observation's of earthing switch sound contact interlock condition problem, ensured the safe and stable operation of electric medium voltage alternating current distribution board equipment, improved nuclear power plant's station power supply reliability.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a side sectional view of an electrical medium voltage AC distribution panel cabinet of the present invention;
FIGS. 2-3 are schematic views of the construction of a first mirror element of the present invention;
fig. 4 is a schematic view of the third mirror of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the electrical medium voltage ac distribution panel cabinet of the present invention includes a cabinet body and a door matched with the cabinet body, the cabinet body includes a first side plate and a second side plate oppositely disposed in parallel, and a third side plate connecting the first side plate and the second side plate, the third side plate is oppositely disposed with the door, an inner cavity of the cabinet body forms an accommodating space, a grounding switch 6 is disposed in the accommodating space, an arc fault valve 1 and a bus 2 are disposed in the interior of the bus chamber at the upper side of the cabinet body, a circuit breaker or a contactor handcart 3 is further disposed in the accommodating space, the circuit breaker or the contactor handcart 3 is disposed adjacent to the grounding switch 6, a handcart chamber door 4 is disposed at the door corresponding to the circuit breaker or the contactor handcart 3, an outgoing cable fixing plate 5 is further disposed at the lower side of the accommodating space, a current transformer 7 is disposed in the accommodating space, and the outgoing cable passes through the current transformer 7, the other end is connected with a medium-voltage outgoing cable 13 through an outgoing cable connecting terminal 10 and is led out of the disc cabinet through an outgoing cable fixing plate 5.
The upper side plate of the cabinet body is also provided with a plurality of cabinet body sling fixing points 8 which can be arranged at intervals. The upper side of the handcart cabin door 4 is provided with a low-pressure cabin door 9, and the lower side is provided with a ground knife indication observation cabin door 11.
Referring to fig. 2 to 4, in the present embodiment, the visual inspection apparatus for the moving and static contacts of the grounding switch of the medium voltage ac distribution board includes a first mirror 20 detachably mounted on the inner side of the first side plate and disposed opposite to the grounding switch 6, a second mirror detachably mounted on the inner side of the second side plate and disposed opposite to the grounding switch 6, and a third mirror 30 detachably mounted on the inner side of the third side plate and disposed opposite to the grounding switch 6.
In the present embodiment, the first mirror member 20 and the second mirror member have the same structure, and therefore the first mirror member 20 is taken as an example.
The first mirror surface element 20 is a plate-shaped structure, such as a rectangular parallelepiped plate-shaped structure, and is provided with four first mounting holes 201 for the first fasteners to penetrate through and be fixed to the inner side of the first side plate. Correspondingly, the second mirror surface piece is of a plate-shaped structure and is provided with four second mounting holes for the second fastener to penetrate through and be fixed to the inner side of the second side plate.
Preferably, the length of the first mirror element 20 and the length of the second mirror element are both 220-. The thickness of the first and second mirror pieces 20 and 20 may be 5-10 mm.
The first mounting holes 201 may be arranged at four diagonal ends, and taking fig. 3 as an example, the length of the central connecting line of the two first mounting holes 201 on the upper side is approximately 173mm, the length of the central connecting line of the two first mounting holes 201 on the upper and lower sides is approximately 145mm, and preferably, the diameter of the first mounting hole 201 may be 6.5 mm. Preferably, the first mounting hole 201 and the second mounting hole are rivet holes, and the first fastener and the second fastener are rivets, it can be understood that the use of the rivets does not affect the safety insulation distance of the electrical circuit. Of course, the first mounting hole 201 and the second mounting hole may be screw holes, and the first fastener and the second fastener may be screws or bolts.
Preferably, the corner of the first mirror piece 20 may be provided with a C5 chamfer 202.
As shown in fig. 4, the third mirror 30 is a plate-shaped structure, such as a rectangular parallelepiped structure, and has four third mounting holes 301 for a third fastener to pass through and be fixed to the inner side of the third side plate. The length of the third mirror element 30 is 170 and 175mm, preferably 173 mm. The width is 130 mm, 140mm, preferably 135 mm. The thickness of the third mirror 30 may be 5-10 mm.
Preferably, the third mounting holes 301 are arranged at four diagonal ends, the length of the line connecting the centers of the two third mounting holes 301 on the upper side is about 123mm, the length of the line connecting the centers of the two third mounting holes 301 on the upper side and the lower side is about 95mm, and preferably, the diameter of the third mounting hole 201 may be 6.5 mm. Preferably, the third mounting hole 301, and the third fastener is a rivet. It will be appreciated that the use of rivets does not affect the electrical circuit safety insulation distance.
Of course, the third mounting hole 301 may be a screw hole, and the third fastening member may be a screw or a bolt, etc. Preferably, the corner of the third mirror element 30 may be provided with a C5 chamfer 302.
In some embodiments, the third mirror element 30 may be mounted between the third side plate and the grounding switch 6 through a bracket 40 and disposed opposite to the grounding switch 6, the bracket 40 may include a fixing plate 401, two supporting seats 402 connected to the fixing plate 401, and the supporting seats 402 may be of a cylindrical structure, and preferably, the bottom of the supporting seats 402 is provided with a fixing seat 403 for the fixing member to penetrate through and be fixed in the accommodating space.
Of course, the installation position and the installation manner of the third mirror surface element 30 can be adjusted as required, and are not limited specifically here.
Preferably, in the present embodiment, the first, second and third mirror pieces 20, 30 are all mirror stainless steel. Of course, the first, second and third mirror pieces 20, 30 may also be mirror brass. Of course, other non-fragile media or other fixing modes can be adopted to realize the observation function of the moving contact and the static contact of the grounding knife switch.
It can be understood that this medium voltage alternating current distribution board grounding switch sound contact visual inspection device adopts the mirror surface principle of reflecting light through innovatively, choose the mode that the mirror surface spare is fixed to the interior panel of dish cabinet for use, under the circumstances of guaranteeing to keep safe distance with electrified body, observe the grounding switch three-phase sound contact condition directly perceivedly, thereby thoroughly solve the problem that the unable direct observation of grounding switch sound contact interlock condition, ensured the safe and stable operation of electric medium voltage alternating current distribution board equipment, improved nuclear power plant factory with electrical power generating system's power supply reliability.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (7)
1. A visual inspection device for moving and static contacts of a grounding switch of a medium-voltage alternating-current distribution board is suitable for an electric medium-voltage alternating-current distribution board cabinet, the electric medium-voltage alternating-current distribution board cabinet comprises a cabinet body and a door matched with the cabinet body, the cabinet body comprises a first side plate and a second side plate which are oppositely arranged in parallel, and a third side plate which is connected with the first side plate and the second side plate, the third side plate is oppositely arranged with the door, an inner cavity of the cabinet body forms an accommodating space, and the grounding switch is arranged in the accommodating space; the visual inspection device is characterized by comprising a first mirror piece, a second mirror piece and a third mirror piece, wherein the first mirror piece is detachably mounted on the inner side of the first side plate and is opposite to the grounding switch;
the first mirror surface piece, the second mirror surface piece and the third mirror surface piece are mirror surface stainless steel, or the first mirror surface piece, the second mirror surface piece and the third mirror surface piece are mirror surface brass.
2. The visual inspection device for moving and stationary contacts of a medium voltage ac distribution board grounding switch of claim 1, wherein the first mirror member is a plate-like structure having four first mounting holes for a first fastener to be inserted therethrough and fixed to the inside of the first side plate.
3. The apparatus of claim 2, wherein the second mirror member is a plate-shaped structure having four second mounting holes for a second fastener to be inserted therethrough and fixed to the inside of the second side plate.
4. The visual inspection device for moving and stationary contacts of medium voltage ac distribution board grounding switch according to claim 3, wherein the third mirror is a plate-like structure provided with four third mounting holes for a third fastener to be inserted therethrough and fixed to the inside of the third side plate.
5. The medium voltage AC distribution board grounding switch moving and static contact visual inspection device of claim 4, wherein the first fastener, the second fastener and the third fastener are rivets.
6. The visual inspection device for the moving and static contacts of the medium voltage alternating current distribution board grounding switch as claimed in claim 1, wherein the lengths of the first mirror surface piece and the second mirror surface piece are both 220-190 mm, and the widths thereof are 180-190 mm.
7. The visual inspection device for the moving and static contacts of the medium voltage alternating current distribution board grounding knife switch as claimed in claim 1, wherein the length of the third mirror surface piece is 175mm and the width is 130 mm and 140 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122768981.2U CN216598716U (en) | 2021-11-12 | 2021-11-12 | Visual inspection device for moving and static contacts of grounding knife switch of medium-voltage alternating-current distribution board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122768981.2U CN216598716U (en) | 2021-11-12 | 2021-11-12 | Visual inspection device for moving and static contacts of grounding knife switch of medium-voltage alternating-current distribution board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216598716U true CN216598716U (en) | 2022-05-24 |
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ID=81645262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122768981.2U Active CN216598716U (en) | 2021-11-12 | 2021-11-12 | Visual inspection device for moving and static contacts of grounding knife switch of medium-voltage alternating-current distribution board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216598716U (en) |
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2021
- 2021-11-12 CN CN202122768981.2U patent/CN216598716U/en active Active
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