CN-224217985-U - Grounding device for inflatable cabinet

CN224217985UCN 224217985 UCN224217985 UCN 224217985UCN-224217985-U

Abstract

The utility model discloses a grounding device for an inflatable cabinet, which comprises a grounding conductor main body arranged on the outer wall of an air chamber shell, a fixing flange arranged on the inner wall of the air chamber shell, an internal grounding row and an external grounding row, wherein the grounding conductor main body consists of two sections of concentric reducing cylinders with the upper part being small and the lower part being large, the lower section of the grounding conductor main body is connected with one end of the external grounding row, the other end of the external grounding row is connected with a device grounding point, the fixing flange is a short column body with a central through hole, the upper section of the grounding conductor main body penetrates through the air chamber shell, stretches into the central through hole of the fixing flange to be fixed and stretches out of one section of the grounding row to be connected with one end of the internal grounding row, and the other end of the internal grounding row is connected with a main switch grounding row in an air chamber. The utility model can ensure the tightness of the air chamber, short-time tolerance capability and continuity of the grounding loop, provide a stable and reliable fault current discharge channel for the internal grounding fault of the switch equipment or when manual grounding maintenance is needed, and facilitate the disassembly and assembly of the device.

Inventors

XU JIE
LI ZHANGYUN
WEI YANXIA
YAO LIN
HE YUMIN
WANG LINQUAN
ZHENG YILONG
HUANG YUANZHAN

Assignees

广州白云电器设备股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250526

Claims (9)

1. The grounding device for the inflatable cabinet is characterized by comprising a grounding conductor main body arranged on the outer wall of an air chamber shell, a fixing flange arranged on the inner wall of the air chamber shell, an internal grounding row and an external grounding row, wherein the grounding conductor main body consists of two sections of concentric reducing cylinders with the upper part small and the lower part large, the lower section of the grounding conductor main body is connected with one end of the external grounding row, the other end of the external grounding row is connected with a device grounding point, the fixing flange is a short column body with a central through hole, the upper section of the grounding conductor main body penetrates through the air chamber shell, stretches into the central through hole of the fixing flange to be fixed and stretches out of one section of the fixing flange to be connected with one end of the internal grounding row, and the other end of the internal grounding row is connected with a main switch grounding row in the air chamber.
2. The grounding device for an air-filled cabinet according to claim 1, wherein sealing structures are arranged between the bottom surface of the fixing flange and the inner wall surface of the air chamber shell and between the top surface of the lower section cylinder of the grounding conductor body and the outer wall surface of the air chamber shell.
3. The grounding device for the gas-filled cabinet according to claim 2, wherein the sealing structures between the bottom surface of the fixing flange and the inner wall surface of the gas chamber shell and between the top surface of the lower section cylinder of the grounding conductor main body and the outer wall surface of the gas chamber shell are inner and outer annular sealing grooves and sealing rings, the sealing ring of the inner ring is a U-shaped section high-temperature-resistant metal sealing ring, and the sealing ring of the outer ring is an O-shaped section polytetrafluoroethylene sealing ring.
4. The grounding device for an air-filled cabinet according to claim 3, wherein the side surface of the upper section cylinder of the grounding conductor body is provided with threads, the central through hole of the fixing flange is a threaded hole, and the upper section cylinder of the grounding conductor body is in threaded connection with the central through hole of the fixing flange.
5. The grounding device for an air-filled cabinet as set forth in claim 4, wherein the surface of said grounding conductor body is galvanized or silvered except for the threaded surface of the upper cylinder.
6. The grounding device for a gas-insulated switchgear according to claim 5, wherein the bottom surface of the lower-stage column of the grounding conductor body is provided with a first threaded hole, the grounding conductor body is fixed with the grounding row by bolting the grounding row and screwing the grounding row into the first threaded hole, the top surface of the upper-stage column of the grounding conductor body is provided with a second threaded hole, and the grounding row is fixed with the grounding conductor body by bolting the grounding row and screwing the grounding row into the second threaded hole.
7. The grounding device for an air-filled cabinet according to claim 6, wherein the upper section column and the lower section column of the grounding conductor main body are integrally formed, the upper section column is a column, the lower section column is a regular hexagonal prism, the top surface of the upper section column is a plane, which is a joint surface with an internal grounding row, and the bottom surface of the lower section column is a plane, which is a joint surface with an external grounding row.
8. The grounding device for an air-filled cabinet according to claim 7, wherein the outer wall surface of the fixing flange is provided with at least one group of two opposite planes, a pair of third threaded holes which are arranged in the radial direction are formed in one group of planes, and the third threaded holes are used for allowing flat end set screws to penetrate into upper-section cylinders which are tightly propped against the grounding conductor main body.
9. The grounding device for an air-filled cabinet according to claim 8, wherein the fixing flange and the grounding conductor main body are made of red copper material.

Description

Grounding device for inflatable cabinet Technical Field The utility model belongs to the grounding technology of a main switch of metal-enclosed switchgear and control equipment in the power industry, relates to structural design of transition points of indoor and outdoor loops of box-type inflatable switchgear and control equipment, and particularly relates to a grounding device for an inflatable cabinet. Background The short-time tolerance capability of a device grounding loop is one of core indexes in the safety design of a power system, and is directly related to the reliability and safety of the device under the condition of extreme faults. When a ground fault occurs in the ring main unit or manual ground maintenance is needed, the ground loop is the only channel for discharging fault current. If the short-time tolerance capability of the circuit is insufficient, when a fault occurs, the circuit breaker does not work to cut off the fault current yet, and the high-impedance point conductor is fused to cause the fault current to be unable to discharge, so that arc reignition or equipment explosion is easily caused, and the personal safety is endangered. The ring main unit grounding loop becomes a key component for ensuring safe and stable operation in the power system. The box-type inflatable switch equipment and the control equipment are widely applied to a power system by virtue of the characteristics of full sealing, modularization, compactness, high safety, intellectualization, low maintenance, environmental protection, high reliability and the like. The totally-enclosed precondition improves the reliability of product operation, but also increases the design difficulty of the grounding loop in the air chamber, so that the tightness of the air chamber is ensured, and the short-time tolerance capability and continuity of the grounding loop, the convenience of the grounding device and the like are ensured. In view of the above requirements, the grounding inside and outside the air chamber of the equipment at present mainly comprises the following 3 modes: The grounding loop passes through the air chamber, studs are welded face to face, and a main switch in the air chamber is connected to a grounding system through an internal grounding row in the air chamber, the studs, the air chamber wall and an external grounding row of the air chamber. The high-impedance grounding copper piece has the advantages that the installation is convenient, the air chamber tightness is guaranteed, the high-impedance point appears in the grounding loop, when large fault current passes through, the grounding point is easy to fuse, and the fault current cannot be discharged. The mode 2 is that the grounding loop passes through the position opening of the air chamber, the copper block is welded in the middle, and the main switch in the air chamber is connected into the grounding system through the grounding row in the air chamber, the welding copper block and the grounding row outside the air chamber. The gas tank wall assembly welding method has the advantages that the installation is convenient, the grounding loop does not have high impedance points, the welding process requirement is high, the gas tank wall assembly welding method is not easy to detach, the gas leakage is extremely easy, and the sealing performance is difficult to guarantee. The mode 3 is that the grounding loop passes through the position opening of the air chamber, the stainless steel component is welded in the middle, and the main switch in the air chamber is connected into the grounding system through the grounding row in the air chamber, the stainless steel component and the grounding row outside the air chamber. The stainless steel assembly is assembled and welded with the stainless steel gas tank wall, so that the welding is easy, and the sealing performance of the gas tank is ensured; the grounding circuit has the advantages that the grounding circuit is not easy to detach, high impedance points appear in the grounding circuit, when large fault current passes through, the grounding copper piece is easy to fuse, and fault current cannot be discharged. Disclosure of utility model The utility model aims to provide a grounding device for an inflatable cabinet, which can ensure the short-time tolerance capability and continuity of a grounding loop and is convenient to detach and replace while ensuring the tightness of an air chamber. The grounding device for the air-filling cabinet is characterized by comprising a grounding conductor main body arranged on the outer wall of an air chamber shell, a fixing flange arranged on the inner wall of the air chamber shell, an internal grounding row and an external grounding row, wherein the grounding conductor main body consists of two sections of concentric reducing cylinders with small upper part and large lower part, the lower section of the grounding conductor main body is connected with one end of the external