CN104143465B - The earthed switch assembly unit of high-speed grounding switch and its composition - Google Patents

Abstract

The present invention relates to a high-speed grounding switch and the grounding switch assembly unit thereof. The high-speed grounding switch includes a sulfur hexafluoride arc extinguishing device for being placed in the airtight chamber of the shell of the corresponding assembly unit when in use, and the sulfur hexafluoride The arc extinguishing device includes a static end assembly and a moving end assembly. The static end assembly includes a static end conductor and a static arc contact electrically connected to the static end conductor. The connection structure of the conductive rod with fixed electrical connections at the adjacent ends, the assembly of the moving end includes the moving arc contact that grounds the corresponding fault by closing with the static arc contact, and the high-speed grounding switch also includes the power output terminal and the moving arc contact The operating mechanism of the head transmission connection. The invention provides a high-speed grounding switch for extinguishing a submerged current and a grounding switch assembly unit using the grounding switch.

Description

High-speed earthing switch and its constituent earthing switch assembly unit

technical field

The invention relates to a high-speed grounding switch in the field of power transmission equipment and a grounding switch assembly unit thereof.

Background technique

More than 90% of the faults on ultra-high voltage transmission lines are single-phase ground faults, and about 80% of the single-phase ground faults are "instantaneous" faults. Most of the 220kV and above lines in my country use single-phase reclosing to eliminate single-phase ground faults. To improve the stability of the system and the reliability of power supply, the success of single-phase reclosing depends on whether the submerged arc at the fault point can be self-extinguished. When a single-phase ground fault occurs in the transmission line, the automatic reclosing device of the system will act immediately, the circuit breakers at both ends of the fault phase will be disconnected immediately, and the short-circuit current will be cut off. At this time, the sound phase will continue to provide current to the fault point through electrostatic coupling and electromagnetic coupling. , that is, the latent supply current.

Because the wires of ultra-high voltage transmission lines are mostly split by 8 or even 12, and the distance between phases is relatively large and the lines are long, the distributed capacitance of the line to the ground and the distributed capacitance between phases are large, and the submerged arc generated by the induced voltage from the sound phase The longer burning time greatly reduces the success rate of single-phase automatic reclosing, which is very harmful to the system. Therefore, corresponding measures must be taken to shorten the extinguishing time of the submerged arc. At present, the methods for extinguishing the submerged arc mainly include adding a high-speed grounding switch and connecting the neutral point of the shunt reactor with a small reactance. In the construction of UHV demonstration lines in my country, the neutral point of the shunt reactor is connected to a small reactance. This method may form a resonant circuit with the impedance of the reactor due to the phase-to-phase and phase-to-ground capacitance. Preventive measures need to be taken, which increases the complexity of system protection. Sexuality, at the same time more investment.

Contents of the invention

The purpose of the present invention is to provide a high-speed grounding switch for extinguishing the submerged current; the purpose of the present invention is also to provide a grounding switch assembly unit using the grounding switch.

In order to solve the above problems, the technical scheme of the high-speed grounding switch in the present invention is:

High-speed grounding switch, including sulfur hexafluoride arc extinguishing device for placing in the airtight chamber of the shell of the corresponding assembly unit when in use, the sulfur hexafluoride arc extinguishing device includes static end assembly and moving end assembly, static end The assembly includes the static end conductor and the static arc contact electrically connected to the static end conductor. The static end conductor is provided with a conductive rod connection structure for fixed electrical connection with the adjacent ends of the corresponding two conductive rods respectively. The moving end assembly It includes a moving arcing contact that grounds a corresponding fault phase by closing with the static arcing contact, and the high-speed grounding switch also includes an operating mechanism that is drivingly connected to the moving arcing contact at a power output end.

The static end conductor includes a conductive sleeve whose axis extends in the up-and-down direction, and the static arc contact is coaxially arranged at the lower end of the inner hole of the conductive sleeve through a static arc contact fixing bracket.

The connection structure of the conductive rod includes an electrical connection sleeve whose axis is perpendicular to the axis of the static arc contact, and which is used for the coaxial conductive insertion of the corresponding conductive rod.

The technical scheme of the grounding switch assembly unit in the present invention is: the grounding switch assembly unit includes a housing and a mechanism box, and a sealed air chamber is arranged in the housing, and two air chambers are installed on the air chamber wall of the airtight air chamber through an insulating support structure. A center conductor used to be electrically connected to the corresponding single-phase when in use, and a conductive rod respectively electrically connected to each center conductor is arranged in the airtight chamber, and a sulfur hexafluoride arc extinguishing device is also arranged in the airtight chamber, The sulfur hexafluoride arc extinguishing device includes a static end assembly and a moving end assembly fixed to the shell through the static end support and the moving end support respectively. The static end assembly includes the static end conductor and the electrical connection set on the static end support. For the static arc contact on the static end conductor, the static end conductor is provided with a conductive rod connection structure that is respectively fixed and electrically connected to the adjacent ends of the two conductive rods. The static arcing contact is closed to ground the single-phase moving arcing contact, and the grounding switch assembly unit also includes an operating mechanism in which the power output end is in transmission connection with the moving arcing contact.

The static end conductor includes a conductive sleeve whose axis extends in the up-and-down direction, the static arc contact is coaxially arranged at the lower end of the inner hole of the conductive sleeve through the static arc contact fixing bracket, and the moving arc contact is located at the bottom of the inner hole of the conductive sleeve. The lower side of the static arc contact, the operating mechanism is located at the lower side of the moving end assembly.

The housing includes a vertical cylinder whose axis extends in the up-and-down direction and two horizontal cylinders arranged on both sides of the vertical cylinder. Each conductive rod is respectively arranged coaxially with the corresponding horizontal cylinder. The moving arc contact The head and the static arc contact are arranged coaxially with the vertical cylinder.

The upper and lower ends of the vertical cylinder are respectively provided with upper and lower sealing structures which are sealed and matched with the cylinder wall of the vertical cylinder, and the insulating support structures are respectively arranged in each horizontal cylinder, and the airtight air chamber It is surrounded by the upper and lower sealing structures, each insulating support structure and the vertical and horizontal cylinders at the corresponding positions.

The static end support includes an upper insulating support sleeve, and the upper insulating support sleeve includes a cylinder part coaxially arranged on the upper end of the static end conductor and an upper cover plate fixed on the upper end of the cylinder part, and the upper cover plate is set There is an upper bolt connection structure for detachable and fixed connection with the upper end of the vertical cylinder.

The moving end support includes a lower insulating support sleeve arranged coaxially with the moving arc contact, and the lower end of the lower insulating supporting sleeve is provided with a ring for detachable fixing with the lower end of the vertical cylinder. The lower bolt connection structure of the connection, the insulating pull rod that realizes the transmission connection between the operating mechanism and the moving arc contact is pierced in the lower insulating support cylinder.

The beneficial effect of the present invention is: when in use, the central conductor in the present invention is electrically connected to the corresponding single-phase to realize the electrical connection between the static end conductor and the single-phase. The faulty single phase is called the faulty phase. The circuit breakers at both ends of the faulty phase trip, and the primary arc is extinguished. The other two charged phases continue to provide current to the fault point through electrostatic coupling and electromagnetic coupling. Submerged supply current is generated. At this time, the operating mechanism drives The dynamic and static arc contacts are closed, the fault phase is grounded through the static arc contacts and the dynamic arc contacts, the submerged arc is extinguished, and then the operating mechanism drives the dynamic and static arc contacts to open, and the present invention uses sulfur hexafluoride to extinguish The dynamic and static arc contacts in the arcing device are grounded, which can ensure the smooth arc extinguishing when the dynamic and static arc contacts are opened, so as to ensure the successful reclosing of subsequent circuit breakers.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of an earthing switch assembly unit in the present invention;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a schematic diagram of cooperation between the grounding switch and the vertical cylinder in Fig. 1;

Fig. 4 is a schematic structural view of the static end assembly in Fig. 3;

Fig. 5 is a schematic structural view of the moving end assembly in Fig. 3;

Fig. 6 is a schematic structural view of the operating mechanism in Fig. 1;

Fig. 7 is a right side view of Fig. 6 .

detailed description

The embodiment of the grounding switch assembly unit is shown in Figures 1 to 7: it includes a housing 40, and the housing includes a vertical cylinder 42 whose axis extends in the up and down direction and a horizontal cylinder 43 placed on the left and right sides of the vertical cylinder. The opposite ends of each horizontal cylinder are provided with flange connection structures 47 for fixed connection with other cylinders of the GIS equipment. During transportation, each flange connection structure is covered with a packaging cover 4 . The lower end of the vertical cylinder is provided with a mechanism box 7 . Each horizontal cylinder is sealed and equipped with an insulating support structure, and the central position of each insulating support structure is provided with a central conductor for electrical connection with the corresponding single-phase when in use. The insulating support structure is composed of pot insulators 2, and each central conductor The upper part is electrically connected with a conductive rod 44, and each pot insulator is respectively sealed and fixedly connected with the cylinder wall of the corresponding transverse cylinder. The upper and lower ends of the vertical cylinder are respectively provided with an upper sealing structure and a lower sealing structure, wherein the upper sealing structure is composed of an inspection cover 45 mounted on the upper port of the vertical cylinder, and the lower sealing structure includes a mechanism box. The lower support plate 46 connected to the body, the vertical cylinder and the lower support plate are sealed by a sealing ring, the upper and lower sealing structures, each pot insulator and the horizontal and vertical cylinders at the corresponding positions form a closed air chamber, and the conductive rod Located in the airtight chamber, an adsorbent 10 is arranged on the shell wall corresponding to the airtight chamber, and the airtight chamber is filled with sulfur hexafluoride gas, so that the airtight chamber forms a large arc extinguishing chamber, A sulfur hexafluoride arc extinguishing device is arranged in the airtight air chamber to realize a good arc extinguishing function of the sulfur hexafluoride arc extinguishing device. The horizontal cylinder at the corresponding position refers to the horizontal cylinder between the two pot insulators, and the vertical cylinder at the corresponding position refers to the vertical cylinder between the upper and lower sealing structures. The sulfur hexafluoride arc extinguishing device is arranged in the vertical cylinder of the airtight chamber, and the sulfur hexafluoride arc extinguishing device includes the static end assembly 1 and The moving end assembly 6, the static end assembly includes the static end conductor 16 arranged on the static end support and the static arc contact 21 electrically connected to the static end conductor, the static end conductor includes a conductive sleeve coaxially arranged with the vertical cylinder , the static arc contact is coaxially arranged at the lower end of the inner hole of the conductive sleeve through the static arc contact fixing bracket 18, and the left and right ends of the conductive sleeve are respectively provided with conductive rods for fixed electrical connection with the adjacent ends of the two conductive rods The connection structure, the connection structure of the conductive rod includes an electrical connection sleeve for the coaxial conductive insertion of the corresponding conductive rod. Two electrical connection sleeves are arranged on the same axis. An upper shield 15 and a lower shield 19 are respectively provided. The static end support includes an upper insulating support tube. The upper insulating support tube includes a cylinder part 14 coaxially arranged with the vertical cylinder and an upper cover plate 20 fixed on the upper end of the cylinder part. The upper end of the vertical cylinder There is a ring-shaped installation step along the top. The installation step has an upward installation base surface. The upper cover plate is fixed on the installation base surface through the upper bolt connection structure. The inspection cover is located above the upper cover plate. The static end conductor It is fixed at the lower end of the cylinder part. The moving end assembly includes a moving arc contact 28 that grounds the single phase by closing with the static arc contact when a single phase fault occurs. The moving arc contact is located on the lower side of the static arc contact, and a power The output end is connected to the operating mechanism 8 of the moving arc contact through an insulating pull rod 27. The sulfur hexafluoride arc extinguishing device also includes a pneumatic cylinder 22 coaxially sleeved on the periphery of the moving arc contact. Cylinder conduction connection, the upper end of the pneumatic cylinder is fixed with a nozzle 29, the guide of the pneumatic cylinder is set on the piston barrel 24, and the pneumatic cylinder is connected with the insulating rod by transmission, that is to say, the insulating rod, the pneumatic cylinder, the nozzle and the moving arc contact act synchronously. The moving end assembly also includes a moving end support. The moving end support is provided with a contact finger 23 electrically connected to the pneumatic cylinder. The contact finger is electrically connected to the ground terminal assembly 9 through the moving end support, thereby realizing the assembly of the moving arc contact and the ground terminal. Electrically connected, the lower end of the movable end support is fixed with a movable end support cylinder 25, and the lower end of the piston cylinder is provided with a buffer piston 26. The working principle of the sulfur hexafluoride arc extinguishing device is: when the dynamic and static arc contacts are closed, through The dynamic and static arcing contacts realize single-phase grounding. When the dynamic and static arcing contacts are opened, the insulating rod drives the moving arcing contacts, nozzles, and the pneumatic cylinder to move downward, and the sulfur hexafluoride gas in the pneumatic cylinder is compressed and released. When the pressure rises, when the nozzle is opened, the high-pressure gas will be discharged from the nozzle to realize the arc blowing effect. An upper support plate 50 fixedly connected with the lower insulating support tube is arranged at the lower end of the movable end support tube, the insulating pull rod passes through the through hole opened on the upper support plate, and the insulating pull rod is sealed and slidably matched with the through hole on the upper support plate, The mechanism box is provided with an operating mechanism 8 that is connected to the moving arc contact through an insulating pull rod. The operating mechanism is a hydraulic operating mechanism. The operating mechanism includes a transmission shaft 32, and a crankshaft connecting rod 31 is fixed on the transmission shaft. The connecting rod of the crankshaft connecting rod is hingedly connected with the lower end of the insulating pull rod, and the power output end of the hydraulic drive mechanism is connected with the transmission shaft. In actual use, the hydraulic drive mechanism drives the drive shaft to rotate, so that the crankshaft connecting rod drives the insulating pull rod to move up and down , in order to realize the opening and closing of the dynamic and static arc contacts. Item 30 represents the crankcase; Item 3 represents the electrical connector that realizes the electrical connection between the conductive rod and the corresponding single phase, and the electrical connector is a sleeve-like structure; Item 17 represents the electrical connection support seat for the installation of the power supply connection sleeve.

When in use, connect the grounding switch assembly unit with the cylinder of other GIS equipment, and connect the conductive rod to the corresponding single-phase conductive connection. When a single-phase grounding short circuit fault occurs in the operating line, an arc is generated, and the circuit breaker at both ends of the faulty phase tripping, the primary arc is extinguished, and the other two charged phases continue to supply current to the fault point through electrostatic coupling and electromagnetic coupling. When the single phase is grounded, the submerged arc is extinguished, then the dynamic and static arc contacts of the grounding switch are opened, and finally the circuit breaker is successfully reclosed, and the line resumes normal live operation.

The static end assembly and the moving end assembly are arranged in the vertical cylinder, which is beneficial to save the floor area of the assembly unit; the static end assembly is fixed to the shell through the upper insulating support tube, and the upper insulating support tube plays the role of insulation and Supporting function, the upper and lower shielding covers can shield the static end parts to optimize the electric field structure; the moving end assembly is fixed to the shell through the lower insulating support cylinder, and the lower insulating support cylinder plays the role of insulation and support.

In other embodiments of the present invention: the upper insulating support tube can also be arranged below the static end assembly. At this time, the upper end of the upper insulating support tube is fixedly connected to the conductor at the static end, and the lower end of the upper insulating support tube is fixedly connected to the lower support plate. The end assembly is set in the inner hole of the upper insulating support tube; the dynamic and static arc contacts can also be arranged horizontally; the connection structure of the conductive rod can also be a threaded hole set on the conductive sleeve, and the conductive rod is directly fixed by bolts when in use. On the conductive sleeve; of course, the upper insulating support tube can also be omitted. At this time, the static end support can be composed of a conductive rod. The conductive rod not only plays the role of conducting electricity to the static end conductor, but also plays the role of supporting the static end assembly; The operating mechanism can also be a spring operating mechanism or a pneumatic or electromagnetic operating mechanism; the sulfur hexafluoride arc extinguishing device in the present invention is a compressed air arc extinguishing device, and of course the sulfur hexafluoride arc extinguishing device can also use a self-energy type Gas-blown arc extinguishing device; the pot insulator can also be replaced by an insulating support plate or other insulating support structure; the upper insulating support cylinder can also only include the cylinder part, at this time, the upper end of the cylinder part can be directly fixed on the inspection port cover; Of course, the access cover can also not be arranged directly above the upper insulating support cylinder, for example, it is arranged on the side of the vertical cylinder; the two conductive rods can also be arranged vertically. The number of conductive rods on the side can also be appropriately increased; the installation step can also be omitted, and the upper cover plate can be fixed on the inner wall of the inspection hatch or the vertical cylinder by bolts at this time.

The implementation of the high-speed grounding switch is shown in Figures 1 to 7: the high-speed grounding switch includes a sulfur hexafluoride arc extinguishing device and an operating mechanism. The sulfur hexafluoride arc extinguishing device described in the embodiments is the same as the operating mechanism, and will not be described in detail here.

Claims (3)

1. The grounding switch assembly unit is characterized in that: it includes a housing, and a sealed air chamber is arranged in the housing, and the air chamber wall of the airtight chamber is insulated and sealed by an insulating support structure. Conductively connected central conductors, the airtight air chamber is provided with conductive rods that are electrically connected to the central conductors respectively, and the airtight air chamber is also provided with a sulfur hexafluoride arc extinguishing device, the sulfur hexafluoride arc extinguishing device includes respectively passing through The static end support and the moving end support are fixedly arranged with respect to the casing and the moving end assembly. The static end assembly includes the static end conductor arranged on the static end support and the static arc contact electrically connected to the static end conductor. The static end conductor is provided with a conductive rod connection structure that is fixedly electrically connected to the adjacent ends of the two conductive rods respectively, and the moving end assembly includes closing the static arc contact when the single-phase fault occurs. For single-phase grounded moving arc contacts, the grounding switch assembly unit also includes an operating mechanism for driving connection between the power output end and the moving arc contacts, and the static end conductor includes a conductive sleeve whose axis extends in the up and down direction. The arcing contact is coaxially arranged at the lower end of the inner hole of the conductive sleeve through the static arcing contact fixing bracket, the moving arcing contact is located on the lower side of the static arcing contact, and the operating mechanism is located under the moving end assembly On the side, the housing includes a vertical cylinder whose axis extends in the up and down direction and two horizontal cylinders arranged on both sides of the vertical cylinder, and each conductive rod is set coaxially with the corresponding horizontal cylinder respectively. The arcing contact and the static arcing contact are arranged coaxially with the vertical cylinder, and the moving end support includes a lower insulating support sleeve arranged coaxially with the moving arcing contact, and the lower insulating The lower end of the support sleeve is provided with a lower bolt connection structure for detachable and fixed connection with the lower end of the vertical cylinder, and the lower insulating support sleeve is pierced with an insulating ring for realizing the transmission connection between the operating mechanism and the moving arc contact. Tie rod, the lower end of the vertical cylinder is provided with a mechanism box, and the operating mechanism is located in the mechanism box. The operating mechanism includes a transmission shaft, and a crankshaft connecting rod is fixed on the transmission shaft. The lower ends are hinged. 2. The grounding switch assembly unit according to claim 1, characterized in that: the upper and lower ends of the vertical cylinder are respectively provided with upper and lower sealing structures that are sealingly matched with the cylinder wall of the vertical cylinder , the insulating support structures are respectively arranged in each horizontal cylinder, and the airtight air chamber is surrounded by the upper and lower sealing structures, each insulation support structure and the vertical and horizontal cylinders at corresponding positions. 3. The grounding switch assembly unit according to claim 1, characterized in that: the static end support includes an upper insulating support sleeve, and the upper insulating support sleeve includes a cylinder part coaxially arranged on the upper end of the static end conductor and a solid The upper cover plate is arranged on the upper end of the cylinder body, and the upper cover plate is provided with an upper bolt connection structure for detachable and fixed connection with the upper end of the vertical cylinder body.