CN107727893A - Easy-to-replaceable arrester Leakage Current table external member - Google Patents

Abstract

The invention discloses a kind of easy-to-replaceable arrester Leakage Current table external member, including the Leakage Current table for monitoring leakage current of an arrester, it is installed under grounding lead row and arrester draws collets between lower row, the upper clamping anchor ear that is installed on collets, is installed on the lower clamping anchor ear on row under grounding lead, and the upper contact rod for conducting electric current and lower contact rod, described upper contact rod one end is fixed with upper clamping anchor ear obvolvent, the other end is connected with leakage current table, described lower contact rod one end is fixed with lower clamping anchor ear obvolvent, and the other end is connected with leakage current table.The present invention uses mechanical pressure plug installation form to replace past bolt-connected mounting means, more changes jobs simple rapid, greatly facilitates the replacing of arrester Leakage Current table.

Description

Easy Replacement Surge Arrester Leakage Ammeter Kit

technical field

The invention relates to electric power engineering technology, in particular to a device for replacing leakage ammeters of lightning arresters.

Background technique

Surge arrester is one of the important protective devices to ensure the safe operation of the power system. Its main function is to limit the lightning overvoltage transmitted from the line or the internal overvoltage caused by operation. The leakage current meter is a very important reference index for evaluating the quality of the arrester. Because the arrester is usually similar to an insulator, there is no voltage, and the leakage current is very small at this time, about no more than 1mA. If the current value becomes larger, it means that the performance of the valve in the arrester core has declined. By checking the readings of the arrester leakage current meter, the condition of the arrester can be directly reflected, which plays an important role in the safe operation of the power grid. Therefore, when the arrester leakage current meter appears In case of failure, it should be replaced immediately.

The installation form of the current leakage current meter is connected in series between the low-voltage terminal of the arrester and the ground. The main body is generally fixed on the bottom column of the arrester, and both ends of the electrical connection part are directly connected by bolts. When the leakage current meter fails and needs to be replaced, the grounding short wire should be used in parallel with the leakage current meter to prevent the leakage current during replacement from causing injury to the staff, and then the leakage current meter should be removed and replaced.

Since the replacement work is usually carried out with electricity, it is dangerous to the safety of the staff, so the replacement work is usually required to be completed in a short period of time. However, because the conventional installation method of the leakage current meter is the bolt connection method, it is not very convenient to disassemble and install. At the same time, the working environment of some lightning arrester leakage current meters is outdoors. The rapid progress is even more of a hindrance and a test for the safety of the staff.

Contents of the invention

The technical problem to be solved by the present invention is to provide a lightning arrester leakage ammeter kit which facilitates the replacement of the lightning arrester leakage current meter.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: an easy-to-change arrester leakage ammeter kit, including a leakage ammeter for monitoring the leakage current of the arrester, an insulating block installed between the lower row of the grounding conductor and the lower row of the arrester, and an installation The upper clamping hoop on the insulating block, the lower clamping hoop installed on the lower row of the grounding lead, and the upper conductive rod and the lower conductive rod for conducting current, one end of the upper conductive rod is connected to the upper clamping The hoop is locked and fixed, and the other end is connected to the leakage current meter. One end of the lower conductive rod is locked and fixed with the lower clamping hoop, and the other end is connected to the leakage current meter.

Preferably, a movable grounding member is also included, the movable grounding member has a top conductive contact surface located on the top and in conductive contact with the upper clamping hoop, a bottom conductive contact surface located at the bottom and in conductive contact with the lower row of grounding leads, And when the leakage ammeter is used normally, neither the top conductive contact surface nor the bottom conductive contact surface is in conductive contact with the corresponding upper clamping hoop and the lower row of grounding leads.

Preferably, the insulating block is connected with a fixed conductive block that contacts the conductive contact surface on the top of the movable grounding member when the leakage current meter is removed, so as to conduct the leakage current loop.

Preferably, the middle part of the movable grounding part is hingedly installed and the upper part is connected with a compression spring. Under the action of the compression spring, the conductive contact surface on the top of the movable grounding part contacts the fixed conductive block, and the conductive contact surface on the bottom contacts the lower row of grounding conductors.

Preferably, it also includes an insulating top block that pushes the movable grounding piece and compresses the compression spring. When the insulating top piece is pushed, the movable grounding piece breaks contact with the fixed conductive block and the grounding lower row, and the grounding is disconnected. When the insulating top piece is pushed When the top block is ejected, ground conduction occurs.

Preferably, the insulating top block includes a lower acting part acting on the leakage ammeter and an upper acting part acting on the movable grounding part, and the upper acting part is perpendicular to the lower acting part.

Preferably, the fixed conductive block is provided with a lower protrusion, the movable grounding member is provided with an upper protrusion, and the lower protrusion and the upper protrusion are provided with conductive contact slopes that cooperate with each other.

The invention adopts the mechanical pressure plug-in installation form to replace the bolt connection type installation form in the past, and the replacement work is simple and fast, which greatly facilitates the replacement of the lightning arrester leakage current meter.

In addition, in view of the risks existing in the replacement process, a mechanical pressure grounding connection device is installed as a complete set. By changing the installation method of the leakage current meter of the lightning arrester and adding a complete set of devices, the potential safety hazard of the replacement of the leakage current meter is well solved, and the safety risk of the staff is greatly reduced.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

Fig. 1 is a schematic view of the side structure of the present invention.

Fig. 2 is a schematic diagram of the three-dimensional structure of the present invention.

Fig. 3 is a schematic structural diagram of an insulating block.

FIG. 4 is a schematic structural diagram of a fixed conductive block.

Fig. 5 is a schematic structural view of the upper clamping hoop.

Fig. 6 is a schematic diagram of the structure of the upper conductive rod.

Fig. 7 is a schematic diagram of the structure of the insulating top block.

Fig. 8 is a schematic diagram of the structure of the movable grounding member.

In the figure: 1—insulation block, 2—fixed conductive block, 21—lower protrusion, 3—upper clamping hoop, 31—installation part, 32—clamping arm, 4—upper conductive rod, 41—round hole , 5—leakage current meter, 6—lower conductive rod, 7—lower clamping hoop, 8—insulating top block, 81—lower action part, 82—upper action part, 9—compression spring, 10—movable grounding piece, 101 — step hole, 102 — top conductive contact surface, 103 — bottom conductive contact surface, 104 — pin hole, 11 — surge arrester installation column, 111 — installation platform.

detailed description

The technical solutions of the embodiments of the present invention will be explained and described below in conjunction with the accompanying drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention.

As shown in Figures 1 and 2, the easy-to-change arrester leakage ammeter kit is installed on the arrester installation column 11, and the arrester installation column 11 is provided with an installation platform 111 for installing the leakage ammeter 5. The easy-to-change arrester leakage ammeter kit of this embodiment includes a leakage ammeter 5 for monitoring the leakage current of the arrester, an insulating block 1 installed between the grounding lower row and the arrester lower row, and an upper clip installed on the insulating block 1 Tight hoop 3, the lower clamping hoop 7 installed on the lower row of the grounding guide, and the upper conductive rod 4 and the lower conductive rod 6 for conducting current, one end of the upper conductive rod 4 is connected with the upper clamping hoop The hoop 3 is entangled and fixed, and the other end is connected to the leakage current meter 5 . One end of the lower conductive rod 6 is entwined and fixed with the lower clamping hoop 7 , and the other end is connected to the leakage current meter 5 .

Wherein, referring to the structure of the insulating block 1 shown in FIG. 3 , it is a cube and is provided with fixing holes.

Referring to the structure of the upper clamping hoop 3 shown in Figure 5, the structure of the upper clamping hoop 3 and the lower clamping hoop 7 are the same, both including a mounting part 31 and clamping arms 32 arranged on both sides of the mounting part 31, The mounting part 31 is provided with a fixing hole for mounting by screws, and the clamping arm 32 is provided with an engaging groove. The upper clamping hoop 3 and the lower clamping hoop 7 are connected to the upper conductive rod 4 and/or the lower conductive rod 6 through a plug-in engagement structure, and play a role of fixing and conducting electricity to the leakage ammeter 5 . The lower clamping hoop 7 is welded on the lower row of the lightning arrester. Moreover, the fixing method of the hoop is adopted, which can not only ensure reliable connection, but also ensure sufficient contact area.

Referring to the structure of the upper conductive rod 4 shown in FIG. 6 , the upper conductive rod 4 and the lower conductive rod 6 have the same structure, both are cylindrical, and one end is provided with a round hole 41 for connecting with the conductive column of the leakage ammeter 5 .

In addition, it also includes a movable grounding piece 10, the action of the movable grounding piece can connect or disconnect the grounding, so as to facilitate the replacement of the leakage current meter 5. Referring to the structure of the movable grounding member 10 shown in FIG. 8, the movable grounding member 10 has a top conductive contact surface 102 located at the top and in conductive contact with the upper clamping hoop, and a top conductive contact surface 102 located at the bottom and in conductive contact with the lower row of grounding leads. The bottom conductive contact surface 103, and when the leakage ammeter is used in normal times, neither the top conductive contact surface nor the bottom conductive contact surface is in conductive contact with the corresponding upper clamping hoop and the lower row of grounding leads. The insulating block 1 is connected with a fixed conductive block 2 that contacts the conductive contact surface on the top of the movable grounding member when the leakage current meter is removed, so as to conduct the leakage current loop.

The middle part of the movable grounding member 10 is hingedly installed and the upper part is connected with a compression spring 9 , which provides motion energy for the movable grounding member 10 . During normal operation, the compression spring 9 is in a compressed state, and the movable grounding member 10 is disconnected from the upper clamping hoop 3; Through, the leakage current flows through it.

As shown in FIG. 8 , a stepped hole 101 is provided on the movable grounding member 10 , and one end of the compression spring 9 is installed in the stepped hole 101 . Under the action of the compression spring, the conductive contact surface on the top of the movable grounding member is in contact with the fixed conductive block, and the conductive contact surface at the bottom is in contact with the lower row of grounding conductors. A through pin hole 104 is provided in the middle of the movable grounding member 10 for realizing the hinge in the middle.

As shown in Figure 4, the fixed conductive block 2 is provided with a lower protrusion 21, and the lower protrusion 21 is provided with a conductive contact surface of the conductive block, as shown in Figure 8, the movable grounding member 10 is provided with an upper protrusion part, the top conductive contact surface 102 is arranged on the upper protruding part, so a mutually cooperating conductive contact surface is formed between the lower protruding part 21 and the upper protruding part, and both adopt inclined plane design, and the bottom conductive contact surface 103 Also has a sloping plan. Moreover, the inclined plane adopts a design with a width of 30 mm to ensure sufficient conductive area.

In addition, it also includes an insulating top block 8 that pushes the movable grounding piece 10 and compresses the compression spring 9, the insulating top block structure shown in FIG. The upper acting part 82 acting on the movable grounding part is perpendicular to the lower acting part 81 . When the insulating top block 8 is pushed forward, the movable grounding piece 10 breaks the contact with the fixed conductive block 2 and the arrester lower row, and the grounding is disconnected. When the insulating top block 8 is ejected by the compression spring 9, the grounding is conducted. When the insulating top block 8 is pressed in by the leakage current meter 5, it means that the leakage current meter is connected to the circuit for use; when the insulating top block 8 is separated from the leakage current meter 5, the leakage current flows to the lower row of the arrester through the movable grounding piece 10. When the leakage current meter 5 is used at ordinary times, the two conductive contact surfaces of the movable grounding member 10 are not in contact with the corresponding positions. When the leakage current meter 5 is replaced, the compression spring 9 pushes the movable grounding member 10 so that the two conductive contact surfaces are in reliable contact. At this time, the leakage current flows to the lower row of the grounding conductor through the movable grounding member 10 .

Leakage current flow direction during normal operation: Arrester leading to the lower row → fixing the conductive surface → upper clamping hoop → upper conductive rod → leakage current meter → lower conductive rod → lower clamping hoop → grounding lead to the lower row.

When replacing the leakage current meter, the leakage current flow direction: the lower row of the lightning arrester → the fixed conductive surface → the movable grounding mechanism → the lower row of the grounding lead.

The beneficial effects of the present invention are:

This kit can not only satisfy the normal operation of the leakage current meter, but also has simple operation steps in the replacement project. The replacement can be completed by simply pulling out and plugging in. The action is fast and reliable, and it shows excellent safety performance. Arrived with a solid guarantee.

The easy-to-change surge arrester leakage ammeter kit ensures reliable electrical connection and safe and reliable operation of equipment through mechanical design. At the same time, the replacement work is simple and fast, which greatly improves the quality and work efficiency of maintenance.

If the kit is commercialized, the fault replacement work of the leakage current meter will be improved and guaranteed in terms of technology, process, time and safety. It can be applied to the replacement of leakage current meters of all 220kV and below voltage levels.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the accompanying drawings and the description in the above specific embodiments content. Any modifications that do not depart from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims (5)

1. easy-to-replaceable arrester Leakage Current table external member, it is characterised in that including the leakage for monitoring leakage current of an arrester Ammeter, be installed under grounding lead row and arrester draw collets between lower row, the upper clamping anchor ear that is installed on collets, The lower clamping anchor ear being installed under grounding lead on row, and the upper contact rod for conducting electric current and lower contact rod, it is described on lead Torch one end is fixed with upper clamping anchor ear obvolvent, and the other end is connected with leakage current table, described lower contact rod one end and lower clamping Anchor ear obvolvent is fixed, and the other end is connected with leakage current table.

2. easy-to-replaceable arrester Leakage Current table external member according to claim 1, it is characterised in that also include activity ground connection Part, the movable earthing member have one positioned at top and with it is upper clamping anchor ear conductive contact top conductive contact surface, one Positioned at bottom and with grounding lead arrange conductive contact bottom conductive contact face, and ought usually leakage current table in use, top Conductive contact is not arranged in conductive contact surfaces and bottom conductive contact face with corresponding upper clamping anchor ear and grounding lead.

3. easy-to-replaceable arrester Leakage Current table external member according to claim 2, it is characterised in that the collets connection Contacted when removing leakage current table with movable earthing member top conductive contact surface, to turn on the fixed conductive of leakage current loop Block.

4. easy-to-replaceable arrester Leakage Current table external member according to claim 3, it is characterised in that the movable earthing member The be hinged installation in middle part and top be connected with compression spring, under compression spring effect, movable earthing member top conductive contact surface Contacted with fixed conducting block, bottom conductive contact face contacts with row under grounding lead.

5. easy-to-replaceable arrester Leakage Current table external member according to claim 4, it is characterised in that also including promotion activity Earthing member and the insulation jacking block for compressing the compression spring, when insulation jacking block is pushed into, movable earthing member disconnects and fixed conduction Block and the contact arranged under grounding lead, ground connection disconnect, when the jacking block that insulate is ejected, earth-continuity.