CN103944094A - 10-kV handcart switch cabinet bus fixed contact ground method and special grounding device thereof - Google Patents

Abstract

The invention relates to a 10-kV handcart switch cabinet bus fixed contact ground method and a special grounding device thereof and belongs to the technical field of power maintenance and testing. According to the technical scheme of the special grounding device of the 10-kV handcart switch cabinet bus fixed contact ground method, a connecting joint is made of metal materials and composed of a plurality of elastic pieces (5), a positioning ring (6) and spring rings (7), wherein the plurality of elastic pieces are uniformly fixed to the circumference of the positioning ring to form a tubular structure, the plurality of elastic pieces are distributed in the axial direction of the tubular structure, and both ends of every elastic piece are flanged outwards at the upper opening and the lower opening of the tubular structure respectively; a plurality of the spring rings are fixed at the flanging of the upper opening and the lower opening of the tubular structure; the upper opening of the tubular structure is matched with a switch cabinet bus fixed contact, and the lower opening of the tubular structure is matched with a connecting sleeve; one end of the connecting sleeve is inserted into the lower opening of the tubular structure of the connecting joint; an insulating rod is inserted into the hollow inside of the connecting sleeve. The 10-kV handcart switch cabinet bus fixed contact ground method and the special grounding device thereof can thoroughly solve the problem of incapable of ground insulating during bus maintenance of a 10-kV handcart switch cabinet, achieves good usage effects and is applicable to the bus ground insulating of the 10-kV handcart switch cabinet, convenient to operate and capable of eliminating potential risks.

Description

A 10kV handcart switch cabinet bus static contact grounding method and special grounding device

technical field

The invention relates to a method for grounding a bus static contact of a 10kV handcart switch cabinet and a special grounding device, belonging to the technical field of electric power maintenance tests.

Background technique

"Electrical Safety Work Regulations" stipulates: 1. If the maintenance part is divided into several parts that are not electrically connected (such as the segmented busbar is divided into several sections by isolating switches or circuit breakers), each section should be electrically tested and grounded separately. Short circuit; 2. No circuit breaker or fuse shall be connected between the ground wire, the ground switch and the maintenance equipment. Due to design and ordering problems in substations using 10kV handcart switchgear, most substations do not have 10kV busbar grounding switches or grounding handcarts, and temporary grounding wires cannot be directly connected to the contacts on the side of the switchgear busbar. During the cleaning and testing of the 10kV busbar, it is necessary to disassemble the cabinet and install a temporary ground wire before work, which poses a serious safety hazard. Since the best grounding point for the bus bar of the 10kV handcart switch cabinet is the static contact on the bus bar side of the voltage transformer cabinet, the ground wire connecting rod in the background art cannot be connected to this contact.

Contents of the invention

The purpose of the present invention is to provide a grounding method and a special grounding device for the static contact of the busbar of a 10kV handcart switchgear, which is suitable for the land closure of the busbar of the 10kV handcart switchgear, which is convenient for operation, eliminates potential safety hazards, and solves the above-mentioned problems in the background technology.

Technical scheme of the present invention is:

A special grounding device for the busbar static contact of a 10kV handcart switch cabinet, including a connector, a connector sleeve, a grounding copper wire and an insulating rod.

The connecting head is made of metal and is composed of a plurality of shrapnels, a positioning ring, and a spring ring. The plurality of shrapnels are evenly fixed on the circumference of the positioning ring to form a cylindrical structure. The plurality of shrapnels are arranged along the axial direction of the cylindrical structure. The two ends of a shrapnel are turned outwards at the upper and lower openings of the tubular structure, and multiple spring rings are respectively fixed at the outwards of the upper and lower openings of the tubular structure; the inner diameter of the upper opening of the tubular structure is larger than the inner diameter of the lower opening, and the barrel The upper opening of the cylindrical structure is matched with the static contact of the switch cabinet bus, and the lower opening of the cylindrical structure is matched with the connecting sleeve.

The connecting sleeve is made of metal material and has a hollow sleeve structure. One end of the connecting sleeve is inserted into the lower opening of the cylindrical structure of the connecting head, and the insulating rod is inserted into the hollow of the connecting sleeve from the other end; there are bolt holes on the connecting sleeve, through which the bolts and Ground copper conductor connection.

One end of the connecting sleeve inserted into the lower opening of the tubular structure of the connecting head is a truncated cone structure to ensure a tight connection after insertion.

A 10kV handcart switch cabinet bus static contact grounding method, including the following steps:

① Use a special grounding device, including a connector, a connector sleeve, a grounding copper wire and an insulating rod; the connector is made of metal and consists of multiple shrapnel, positioning ring, and spring ring, and multiple shrapnel are evenly fixed on the center of the positioning ring. On the circumference, a cylindrical structure is formed, and a plurality of shrapnels are arranged along the axial direction of the cylindrical structure. Both ends of each shrapnel are turned outward at the upper and lower openings of the cylindrical structure, and multiple spring rings are respectively fixed on the upper opening of the cylindrical structure. and the valgus of the lower port; the inner diameter of the upper port of the cylindrical structure is larger than the inner diameter of the lower port, the upper port of the cylindrical structure is matched with the static contact of the switch cabinet busbar, and the lower port of the cylindrical structure is matched with the connecting sleeve; the connection The sleeve is made of metal and has a hollow sleeve structure. One end of the connecting sleeve is inserted into the lower opening of the cylindrical structure of the connector, and the insulating rod is inserted into the hollow of the connecting sleeve from the other end; there are bolt holes on the connecting sleeve, which are connected to the grounding copper wire through bolts. ;

②Install the grounding wire in the 10kV voltage transformer cabinet; through the detection, conduct an indirect electric test on the 10kV busbar, and after confirming that the busbar is out of power, open the static contactor cabinet door of the voltage transformer cabinet to expose the three-phase switch cabinet busbar static in the cabinet. contact;

③Connect the grounding copper wire of the special grounding device to the grounding grid of the substation; the upper opening of the connection head of the special grounding device is aligned with the static contact of the switch cabinet bus in the cabinet, and the static contact of the switch cabinet bus is inserted into the upper opening of the connection head. It is connected with the static contact of the switchgear busbar; three static contacts of the three-phase switchgear busbar need to be matched with three connectors to complete the safety measures for the busbar closure during the maintenance of the 10kV handcart switchgear busbar.

The beneficial effects of the present invention are: the connector of the present invention is composed of multiple shrapnels, positioning rings, and spring rings, which can avoid damage to the static contacts in the 10kV voltage transformer cabinet when installing and disassembling the grounding wire, and can completely solve the problem of the 10kV handcart switch cabinet. The problem that the busbar maintenance cannot be sealed, and the use effect is good. It is suitable for the busbar sealing of the 10kV handcart switchgear, which is convenient for operation and eliminates potential safety hazards.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the connector of the embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a connecting sleeve and an insulating rod according to an embodiment of the present invention;

Fig. 3 is a physical schematic diagram of the connector of the embodiment of the present invention;

Fig. 4 is a schematic diagram of the actual assembly of the connector and the connector sleeve according to the embodiment of the present invention;

Fig. 5 is a physical schematic diagram of a dedicated grounding device according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of grounding operation according to an embodiment of the present invention;

In the figure: connector 1, connector sleeve 2, grounding copper wire 3, insulating rod 4, shrapnel 5, positioning ring 6, spring ring 7, switchgear bus static contact 8.

Detailed ways

Below in conjunction with accompanying drawing, the present invention will be further described by examples.

A 10kV handcart switch cabinet dedicated grounding device for busbar static contacts, including a connector 1, a connector sleeve 2, a grounding copper wire 3 and an insulating rod 4.

The connecting head is made of metal and is composed of a plurality of shrapnels 5, a positioning ring 6, and a spring ring 7. The plurality of shrapnels are evenly fixed on the circumference of the positioning ring to form a cylindrical structure, and the plurality of shrapnels are aligned along the axial direction of the cylindrical structure. Arrangement, the two ends of each shrapnel are turned outwards at the upper and lower openings of the cylindrical structure, and multiple spring rings are respectively fixed at the outwards of the upper and lower openings of the cylindrical structure; the inner diameter of the upper opening of the cylindrical structure is larger than that of the lower opening Inner diameter, the upper opening of the cylindrical structure matches the static contact of the switch cabinet busbar, and the lower opening of the cylindrical structure matches the connecting sleeve.

The connecting sleeve is made of metal material and has a hollow sleeve structure. One end of the connecting sleeve is inserted into the lower opening of the cylindrical structure of the connecting head, and the insulating rod is inserted into the hollow of the connecting sleeve from the other end; there are bolt holes on the connecting sleeve, through which the bolts and Ground copper conductor connection.

One end of the connecting sleeve inserted into the lower opening of the tubular structure of the connecting head is a truncated cone structure to ensure a tight connection after insertion.

A 10kV handcart switch cabinet bus static contact grounding method, including the following steps:

① Use a special grounding device, including a connector 1, a connector sleeve 2, a grounding copper wire 3 and an insulating rod 4; The shrapnel is evenly fixed on the circumference of the positioning ring to form a cylindrical structure. Multiple shrapnels are arranged along the axial direction of the cylindrical structure. Both ends of each shrapnel are turned outward at the upper and lower openings of the cylindrical structure, and multiple spring rings are respectively fixed. At the valgus of the upper and lower openings of the cylindrical structure; the inner diameter of the upper opening of the cylindrical structure is larger than the inner diameter of the lower opening, the upper opening of the cylindrical structure matches the static contact of the switch cabinet busbar, and the lower opening of the cylindrical structure is connected to the The sleeve is matched; the connecting sleeve is made of metal material and has a hollow sleeve structure. One end of the connecting sleeve is inserted into the lower opening of the cylindrical structure of the connecting head, and the insulating rod is inserted into the hollow of the connecting sleeve from the other end; there are bolt holes on the connecting sleeve. Connect to the ground copper wire through bolts;

②Install the grounding wire in the 10kV voltage transformer cabinet; through the detection, conduct an indirect electric test on the 10kV busbar, and after confirming that the busbar is out of power, open the static contactor cabinet door of the voltage transformer cabinet to expose the three-phase switch cabinet busbar static in the cabinet. contact;

③ Connect the grounding copper wire of the special grounding device to the grounding grid of the substation; the upper port of the connector of the special grounding device is aligned with the static contact 8 of the busbar of the switchgear in the cabinet, and the static contact of the busbar of the switchgear is inserted into the upper port of the connector, and connected The head is connected to the static contact of the switchgear busbar; the three-phase three-phase switchgear busbar static contact needs three connectors to match it, and the safety measures for the busbar closure during the maintenance of the 10kV handcart switchgear busbar are completed.

In the embodiment, the length of the grounding copper wire is 3*1.5m+1.5m, and a transparent grounding annealed copper wire of 25 square millimeters is used. the

The length of the insulating rod is 1.2m, which exceeds the standard of 10kV grounding wire. The purpose is that the insulating rod can protrude out of the switch cabinet after the grounding wire is installed, which is obviously eye-catching. The front end of the insulating rod is slotted, and is used as a fixing bolt for avoiding the grounding copper wire when connecting with the connecting sleeve.

Claims (3)

1. A dedicated grounding device for busbar static contacts of 10kV handcart switchgear, characterized in that it includes a connector (1), a connector sleeve (2), a grounding copper wire (3) and an insulating rod (4); The connector is made of metal and is composed of a plurality of shrapnels (5), a positioning ring (6) and a spring ring (7). The plurality of shrapnels are evenly fixed on the circumference of the positioning ring to form a cylindrical structure. The axial arrangement of the cylindrical structure, the two ends of each shrapnel are turned outward at the upper and lower openings of the cylindrical structure, and a plurality of spring rings are respectively fixed at the outwards of the upper and lower openings of the cylindrical structure; The inner diameter of the upper port is larger than the inner diameter of the lower port, the upper port of the cylindrical structure matches the static contact of the switch cabinet busbar, and the lower port of the cylindrical structure matches the connecting sleeve; The connecting sleeve is made of metal material and has a hollow sleeve structure. One end of the connecting sleeve is inserted into the lower opening of the cylindrical structure of the connecting head, and the insulating rod is inserted into the hollow of the connecting sleeve from the other end; there are bolt holes on the connecting sleeve, through which the bolts and Ground copper conductor connection. 2. A dedicated grounding device for busbar static contacts of 10kV handcart switchgear according to claim 1, characterized in that the end of the connecting sleeve inserted into the lower opening of the cylindrical structure of the connecting head is a frustum of cone structure. 3. A 10kV handcart switchgear bus static contact grounding method, characterized in that it comprises the following steps: ① Use a special grounding device, including the connector (1), the connector sleeve (2), the grounding copper wire (3) and the insulating rod (4); the connector is made of metal and consists of multiple shrapnels (5) Ring (6) and spring ring (7). A plurality of shrapnels are evenly fixed on the circumference of the positioning ring to form a cylindrical structure. A plurality of shrapnels are arranged along the axial direction of the cylindrical structure. The upper and lower openings of the tubular structure are turned outwards, and multiple spring rings are respectively fixed at the outwards of the upper and lower openings of the cylindrical structure; The static contact of the busbar is matched, and the lower opening of the cylindrical structure is matched with the connecting sleeve; the connecting sleeve is made of metal and has a hollow sleeve structure. One end of the connecting sleeve is inserted into the lower opening of the cylindrical structure of the connector, and the insulating rod is inserted from the other end. In the hollow of the connecting sleeve; there are bolt holes on the connecting sleeve, which are connected to the grounding copper wire through the bolts; ②Install the grounding wire in the 10kV voltage transformer cabinet; through the detection, conduct an indirect electric test on the 10kV busbar, and after confirming that the busbar is out of power, open the static contactor cabinet door of the voltage transformer cabinet to expose the three-phase switch cabinet busbar static in the cabinet. contact; ③Connect the grounding copper wire of the special grounding device to the grounding grid of the substation; the upper opening of the connection head of the special grounding device is aligned with the static contact (8) of the switch cabinet busbar in the cabinet, and the static contact of the switch cabinet busbar is inserted into the upper opening of the connection head , the connector is connected to the static contact of the switch cabinet bus; the three-phase three switch cabinet bus static contacts need three connectors to match it, and the bus seal safety measures for the 10kV handcart switch cabinet bus maintenance are completed.