CN106451084B - Transformer combined protection electrical appliance - Google Patents

Abstract

The present invention, which proposes, becomes platform combined type protection electric appliance, including fuse, arrester and connecting plate；Fuse includes insulator, Packed inlet wire set is set at the top of insulator, inlet line is provided in inlet wire set, insulator bottom sets Packed rubber cover, fusing carrier import is provided on rubber cover, Packed lead collar is also set up on rubber cover, egress line is provided in lead collar, anchor ear is provided with outside insulator, is provided on anchor ear and the connecting portion for being connected with fuse cross-arm；Metallic connection parts are provided at the top of arrester, arrester bottom is provided with insulating boot, is provided with inlet wire lead and outlet lead on insulating boot, and the egress line on fuse is electrically connected with the inlet wire lead on arrester；Connecting portion connection on one end and anchor ear of connecting plate, the other end of connecting plate are fixedly connected with the metallic connection parts of arrester, and ground terminal is provided on connecting plate.The configuration of the present invention is simple, it is easy for installation, it can be widely applied to power domain.

Description

Transformer combined protection electrical appliance

technical field

The invention relates to a platform-changing combined protection appliance, which belongs to the technical field of electric power transmission.

Background technique

High-voltage combined electrical appliances are divided into two types: open type and fully enclosed type according to the insulation structure. The former is based on an isolating switch or a circuit breaker, and is composed of components such as a current transformer, a voltage transformer, and a cable head. The latter is to seal the high-voltage live parts of each component in a grounded metal shell, and the shell is filled with gas, oil or solid insulating medium with good insulation properties. Transformers, current transformers, busbars, lightning arresters, cable terminals, etc.) are connected in sequence and form a whole according to the wiring requirements. Sulfur hexafluoride (SF6) fully enclosed electrical appliances that appeared in the 1960s have the characteristics of small installation volume, good safety performance, high reliability, and long maintenance cycle, so they have developed rapidly. In the prior art, the installation of the fuse and the lightning arrester is generally installed above the pole tower and the substation through a bracket, and the fuse and the lightning arrester need to be fixed separately during installation, and due to the limited space on the pole, the lightning arrester bracket needs to be installed on the pole tower To fix the lightning arrester, after the installation is completed, it is necessary to connect the outgoing line of the fuse with the incoming line of the lightning arrester through a wire. Therefore, its structure is relatively complicated, the installation process is loaded down with trivial details, and final maintenance is also quite complicated.

Contents of the invention

The invention overcomes the deficiencies of the prior art, and the technical problem to be solved is: a transformer combined protective device integrating a lightning arrester and a fuse is proposed, which has a simple structure, convenient installation, and convenient maintenance.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is as follows: a combined protective device including a fuse, a lightning arrester and a connecting plate; A sealed wire inlet sleeve is provided, and an inlet line is arranged inside the wire inlet sleeve. A sealed rubber cover is provided at the bottom of the porcelain sleeve, and an inlet of a melting part is provided on the rubber cover. On the side of the bottom of the porcelain sleeve, A sealed outlet sleeve is also provided, and an outlet line is arranged inside the outlet sleeve, and a hoop is arranged on the outside of the porcelain sleeve, and a connecting part for connecting with the cross arm of the fuse is arranged on the hoop; The top of the arrester is provided with a metal connection part, the bottom of the arrester is provided with an insulating cover, and the insulating cover is provided with an incoming lead and an outgoing lead, and the outlet line on the fuse is electrically connected to the incoming lead on the arrester ; One end of the connecting plate is connected to the connecting portion on the hoop, the other end of the connecting plate is fixedly connected to the metal connecting portion of the arrester, and the connecting plate is provided with a grounding terminal for connecting a grounding wire .

An upper electrode and a lower electrode are arranged in the porcelain sleeve, the upper electrode is electrically connected to the inlet wire in the wire inlet sleeve, the lower electrode is electrically connected to the outlet wire in the wire outlet sleeve, and the upper electrode and the lower electrode are petal-type contacts, the fuse-carrying part is arranged between the upper electrode and the lower electrode, the upper electrode at the upper end of the fuse-carrying part is electrically connected to the upper electrode, and the fuse-carrying part The lower electrode at the lower end of the component is electrically connected to the lower electrode.

The tail end of the connecting part is a U-shaped plate, and the U-shaped plate is horizontally inserted into the cross-arm of the fuse, and fixed on the cross-arm of the fuse by bolts.

The inlet of the melting part is provided with a sealing cover.

The rated voltage of the fuse is 12kV, the rated current is 50A, the rated power is 50Hz, and the rated breaking current is 8kA.

The rated voltage of the arrester is 17kV, the working voltage is 13.6kV, the working discharge current is 5000A, and the action start voltage is 24kV.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The unit-changing combined protection device of the present invention adopts the combined protection design scheme of the compact structure of the fuse arrester, and the external incoming line enters the fuse from the upper part of the fuse, and then exits from the lower part of the fuse after carrying the fuse After being directly connected to the arrester, it leads to the transformer terminal. The arrester and the fuse share a fixed bracket, and are fixed on the tower pole through the hoop on the fuse, which saves a special cross arm for the arrester; the grounding wire of the arrester passes through the arrester bracket. Bolt connection reduces the complexity of installation, reduces installation requirements, and can also reduce a large number of hardware, cable conductors, insulator fixtures and other materials;

(2) In the switchable combined protective device of the present invention, the fuse adopts a closed structure, which improves the insulation of the line and reduces the maintenance workload; the electrode of the key component of the fully sealed fuse is built in the insulating sleeve, which greatly improves Improve the ability of the device to resist corrosion and salt pollution; not only improve the reliability of product performance, but also greatly extend the service life of the equipment;

(3) The combined design of the lightning protection device of the new combined protective device and the fully sealed jet fuse not only improves the insulation degree of the 10KV substation, but also strengthens the protection measures for the staff during the equipment maintenance process in the substation area.

Description of drawings

Fig. 1 is a schematic structural diagram of a platform-changing combined protective device proposed in an embodiment of the present invention;

Fig. 2 is a top view of the platform-changing combined protective device proposed by the embodiment of the present invention;

Figure 3 is a schematic diagram of the internal structure of the fuse;

Fig. 4 is a schematic diagram of the structure of the upper electrode and the lower electrode in the fuse.

Detailed ways

In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments and accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, and Not all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Fig. 1 and Fig. 2, the present invention proposes a combined protective device with a variable table, which includes a fuse 1, a lightning arrester 2 and a connecting plate 3; the fuse 1 includes a porcelain sleeve 11 with an accommodating space inside , the top of the porcelain sleeve 11 is provided with a sealed wire inlet sleeve 12, the wire inlet sleeve 12 is provided with an inlet line, the bottom of the porcelain sleeve 11 is provided with a sealed rubber cover 13, and the rubber cover 13 is provided with The inlet of the molten part, the lower side of the porcelain sleeve 11 is also provided with a sealed outlet sleeve 15, the outlet sleeve 15 is provided with an outlet line, and the outside of the porcelain sleeve 11 is also provided with a hoop 17, the hoop 17 is provided with a connecting part for connecting with the cross arm of the fuse; the top of the arrester 2 is provided with a metal connection part 21, the bottom of the arrester 2 is provided with an insulating cover 22, and the insulating cover 22 is provided with an incoming line Lead 23 and outgoing lead 24, the outlet line on the fuse is electrically connected to the incoming lead 23 on the arrester; one end of the connecting plate 3 is connected to the connecting part of the hoop 17, and the connecting plate The other end of 3 is fixedly connected to the metal connection part 21 of the arrester 2, and the connection plate 3 is provided with a ground terminal 31 for connecting a ground wire.

As shown in Figure 3, an upper electrode 18 and a lower electrode 19 are arranged in the porcelain sleeve 11, the upper electrode 18 is electrically connected to the inlet wire in the wire inlet sleeve 12, and the lower electrode is connected to the wire outlet sleeve The inner outlet line is electrically connected, as shown in Figure 4, the upper electrode 18 and the lower electrode 19 are petal-type contacts, and the fuse carrier (fuse tube) is arranged on the upper electrode and the lower electrode Between them, the upper electrode at the upper end of the fuse carrier is electrically connected to the upper electrode, the lower electrode at the lower end of the fuse carrier is electrically connected to the lower electrode, and the petal-shaped contact makes the gripping force of the fuse cylinder stable and reliable; Moreover, during the fuse blowing and spraying process, an upward force will be generated on the fuse cartridge to ensure that the fuse cartridge will not fall.

As shown in FIG. 1 , the tail end of the connecting part of the hoop 17 is a U-shaped plate, and the U-shaped plate is horizontally inserted into the cross-arm of the fuse, and fixed on the cross-arm of the fuse by bolts.

In addition, a sealing cover 14 is provided on the inlet of the fuse-carrying part. By setting the sealing cover 14, the sealed wire inlet sleeve 12, the wire outlet sleeve 14 and the sealed rubber cover 13, the fuse 1 has good sealing performance, effectively Prevent dust pollution and salt pollution, and ensure long-term stable performance even in coastal areas; in addition, the fully sealed fuse makes the electrodes of key components built in the insulating porcelain sleeve, which is not easy to be polluted and rusted, and maintains good insulation resistance The characteristics greatly improve the ability of the device to resist corrosion and salt pollution, not only improve the reliability of product performance, but also greatly extend the service life of the equipment.

Wherein, the working parameters of the fuse may be: a rated voltage of 12 kV, a rated current of 50 A, a rated power of 50 Hz, and a rated breaking current of 8 kA.

Wherein, the working parameters of the lightning arrester may be: the rated voltage is 17kV, the working voltage is 13.6kV, the working discharge current is 5000A, and the action starting voltage is 24kV.

The installation process of the platform-changing combined protective device of the present invention is as follows: firstly, the described platform-changing combined protective device (lightning arrester, fuse and connecting plate) is fixed on the cross arm of the fuse through the connecting part on the hoop; Then connect the inlet wire on the fuse with the external wire, and connect the outlet lead wire on the arrester with the external wire; finally connect the fuse-carrying part with the operating rod, and connect the fuse-carrying part from the bottom of the fuse through the operating rod The inlet of the fuse-carrying part is put into the fuse, the operating rod is removed, and the sealing cover is put on so that the inlet of the fuse-carrying part is sealed. Therefore, the installation process of the platform-changing combined protective device of the present invention is very simple, which greatly reduces the installation personnel's work on the pole, and can improve work efficiency.

Wherein, the connection between the inlet wire on the fuse and the external wire is realized through a crimping tube. The specific steps are: set the PD tube on the inlet wire or the external wire on the fuse, so that the inlet wire on the fuse and the external wire The external wires enter the crimping tube through both ends of the crimping tube respectively, and the inlet wire and the external wire are respectively connected to the crimping tube through the crimping pliers. After moving the PD tube to the crimping part, pull it out and Remove the round tube in the PD tube; wherein, the connection between the outlet lead wire on the arrester and the external wire can also be realized by crimping the tube. The specific steps are: set the PD tube on the outlet lead wire or the external wire of the arrester, so that the arrester The outgoing lead wires and external wires enter the crimping tube respectively through the two ends of the crimping tube, and the inlet wire and the external wire are respectively connected to the crimping tube through the crimping pliers. After moving the PD tube to the crimping position, pull out the Take out and remove the round tube inside the PD tube; connect the terminal or the crimping tube to the connection, and then connect the other end of the terminal or the crimping tube to the external wire through the crimping pliers.

The unit-changing combined protection device of the present invention adopts the combined protection design scheme of the compact structure of the fuse arrester, and the external incoming wire enters the fuse from the upper part of the fuse, and after carrying the fuse, the wire exits from the lower part of the fuse and directly connects with the arrester. After being connected, it leads to the transformer terminal. The arrester and the fuse share a fixed bracket, which is fixed on the tower pole through the hoop on the fuse, which saves a special cross arm for the arrester; the grounding wire of the arrester is connected by bolts on the arrester bracket. The complexity of installation is reduced, the installation requirements are reduced, and a large number of fittings, cable conductors, insulator fixing devices and other materials can be reduced.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Within the scope of knowledge of those of ordinary skill in the art, various modifications can be made without departing from the gist of the present invention. kind of change.

Claims (6)

1. become platform combined type protection electric appliance, which is characterized in that including fuse, arrester and connecting plate；

The fuse includes the insulator for being internally provided with accommodating space, and Packed inlet wire set, institute are set at the top of the insulator It states and inlet line is provided in inlet wire set, the insulator bottom sets Packed rubber cover, it is molten that load is provided on the rubber cover Part import also sets up Packed lead collar in the insulator lower side, egress line, the porcelain is provided in the lead collar Set is external to be provided with anchor ear, is provided on the anchor ear and the connecting portion for being connected with fuse cross-arm；

Metallic connection parts are provided at the top of the arrester, the arrester bottom is provided with insulating boot, is set on the insulating boot It is equipped with inlet wire lead and outlet lead, the egress line on the fuse is electrically connected with the inlet wire lead on the arrester；

One end of the connecting plate is connected with the connecting portion on the anchor ear, the other end of the connecting plate and the arrester Metallic connection parts are fixedly connected, and are provided with to connect the ground terminal of ground wire on the connecting plate.

2. change platform combined type protection electric appliance according to claim 1, which is characterized in that be provided with top electrode in the insulator With lower electrode, the top electrode is electrically connected with the inlet line in inlet wire set, the lower electrode and going out in the lead collar Mouth line is electrically connected, and the top electrode and the lower electrode are petal type contact, and fusing carrier is arranged on the top electrode and described Between lower electrode, the upper electrode of the fusing carrier upper end is electrically connected with the top electrode, the lower part electricity of the fusing carrier lower end Pole is electrically connected with the lower electrode.

3. change platform combined type protection electric appliance according to claim 1, which is characterized in that the tail end of the connecting portion is U-shaped Plate after the U-shaped board is horizontally inserted into fuse cross-arm, is bolted on the fuse cross-arm.

4. change platform combined type protection electric appliance according to claim 1, which is characterized in that be provided in the fusing carrier import Sealing cover.

5. change platform combined type protection electric appliance according to claim 1, which is characterized in that the rated voltage of the fuse is 12kV, rated current 50A, rated power 50Hz, specified drop-out current are 8kA.

6. change platform combined type protection electric appliance according to claim 1, which is characterized in that the rated voltage of the arrester is 17kV, operating voltage 13.6kV, operating discharge electric current are 5000A, and it is 24kV that action, which starts voltage,.