阅读说明：本技术 一种开关消弧断路器机械连锁的方法 (Mechanical interlocking method for switch arc suppression circuit breaker ) 是由 杨柳 余振 李娜 于 2021-08-17 设计创作，主要内容包括：本发明涉及断路器技术领域,具体涉及一种开关消弧断路器机械连锁的方法,所述的方法包括在A相断路器与B相断路器的驱动杆之间、A相断路器与C相断路器的驱动杆之间、B相断路器与C相断路器的驱动杆之间分别设置连锁杆,使其中任一相断路器合闸、驱动杆上移时,推挤相应的连锁杆向其余两相断路器的驱动杆处移动并对其约束锁定,进而实现合闸时的唯一相；本发明通过在两相断路器的驱动杆之间设置连锁杆,当其中一相的驱动杆上移时,通过连锁杆对另外两相的驱动杆进行锁定；这种防止误投互锁采用的是机械装置,具体是由机械零部件产生刚性互锁,相比于传统的电气方式互锁,提高了实际运行过程中的可靠性。(The invention relates to the technical field of circuit breakers, in particular to a method for mechanically interlocking a switch arc-extinguishing circuit breaker, which comprises the steps that connecting lock rods are respectively arranged between a driving rod of an A-phase circuit breaker and a driving rod of a B-phase circuit breaker, between the driving rod of the A-phase circuit breaker and a driving rod of a C-phase circuit breaker and between the driving rod of the B-phase circuit breaker and the driving rod of the C-phase circuit breaker, when any one phase of circuit breaker is switched on and the driving rod moves upwards, the corresponding connecting lock rod is pushed to move towards the driving rods of the other two phase circuit breakers and is restrained and locked, and further, the only phase is realized during switching on; according to the invention, the linkage rod is arranged between the driving rods of the two-phase circuit breaker, and when the driving rod of one phase moves upwards, the driving rods of the other two phases are locked through the linkage rod; the interlocking for preventing the misdrop adopts a mechanical device, particularly rigid interlocking is generated by mechanical parts, and compared with the traditional electrical interlocking, the reliability in the actual operation process is improved.)

1. A mechanical interlocking method for a switch arc-extinguishing breaker is used for inter-phase interlocking between A, B, C three-phase breakers and is characterized in that connecting and locking rods are respectively arranged between driving rods of an A-phase breaker and a B-phase breaker, between the driving rods of the A-phase breaker and the C-phase breaker and between the driving rods of the B-phase breaker and the C-phase breaker, so that when any one of the A-phase breaker and the B-phase breaker is switched on and the driving rod moves upwards, the corresponding connecting and locking rod is pushed to move towards the driving rods of the other two-phase breakers and is restrained and locked, and then the only phase is switched on.

2. The method for mechanically interlocking a switch arc-extinguishing breaker according to claim 1, wherein the drive levers of the A-phase breaker, the B-phase breaker and the C-phase breaker are each provided with a projection at the bottom thereof, the projection has a slant section extending obliquely downward, and the lower end of the slant section extends downward to form a straight section;

a first sliding guide block is arranged on a circuit breaker bottom plate between the A-phase circuit breaker and the B-phase circuit breaker, and a second sliding guide block is arranged on a circuit breaker bottom plate between the B-phase circuit breaker and the C-phase circuit breaker;

the first sliding guide block is provided with an AB phase connecting lock rod capable of sliding left and right, the second sliding guide block is provided with a BC phase connecting lock rod capable of sliding left and right, and the first sliding guide block and the second sliding guide block are provided with an AC phase connecting lock rod capable of sliding left and right;

the end parts of the AB phase interlocking rod, the BC phase interlocking rod and the AC phase interlocking rod are respectively provided with an inclined plane extending in an inclined way, the inclined planes are matched with inclined plane sections of the convex blocks on the corresponding two phase driving rods, and when the driving rod of one phase moves upwards, the corresponding phase interlocking rod is pushed through the inclined plane section arranged on the convex block at the bottom of the driving rod to lock the driving rods of the other two phase circuit breakers.

3. The method of mechanically interlocking a switch arc suppressing breaker as recited in claim 2, wherein there are two of said first and second sliding guide blocks, respectively.

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a method for mechanically interlocking a switch arc-extinguishing circuit breaker.

Background

In the high-voltage field of 7.2kV to 40.5kV, along with the high-speed development of the intelligent power grid in China, the requirement on the intellectualization of electrical equipment in a power system is gradually improved, and the normal operation of the intelligent power grid is directly influenced by the factors of the intellectualization, the high speed, the reliability and the like of a circuit breaker serving as the most main protection equipment of the power system. The traditional circuit breaker can not meet the intelligent on-off requirement of a power system, the split-phase action circuit breaker is produced by the operation, the circuit breaker can realize the advantage of phase selection operation, and has wide application prospect in the fields of active intervention type arc extinction, fault current limiting, voltage sag inhibition and the like.

Many application occasions require A, B, C phase-to-phase interlocking when the three phases of the circuit breaker are independently switched on and off, namely three phases are required to be simultaneously switched off, but only one phase is in the switching-on position during switching-on operation, so as to avoid short circuit accidents. The method comprises the following steps that firstly, an intelligent controller is used for judging the open circuit state, and software is used for sending an on-off instruction to ensure the uniqueness of closing; and secondly, the secondary auxiliary contacts of the breaker are used for switching on and off, switching on and off loops of the breaker are accessed, and the uniqueness of switching on is ensured by using the logic relation which does not correspond to the position. The methods are all interlocked in an electrical mode, are flexible interlocked, have strong dependence on electrical components and software, are easy to lose efficacy and have poor reliability.

Disclosure of Invention

The invention aims to overcome the defects of strong dependence on electric components and software, easy failure and poor reliability of the existing interlocking by an electric mode, and provides a method for mechanically interlocking a switch arc-extinguishing circuit breaker, which realizes a unique phase during closing and prevents accidents caused by mis-switching.

In order to achieve the purpose, the invention adopts the following technical scheme:

a mechanical interlocking method for a switch arc-extinguishing breaker is used for inter-phase interlocking between A, B, C three-phase breakers, and comprises the steps that connecting lock rods are respectively arranged between driving rods of an A-phase breaker and a B-phase breaker, between the driving rods of the A-phase breaker and a C-phase breaker and between the driving rods of the B-phase breaker and the C-phase breaker, when any one of the A-phase breaker and the B-phase breaker is switched on and the driving rods move upwards, the corresponding connecting lock rods are pushed to move towards the driving rods of the other two-phase breakers and are restrained and locked, and therefore the only phase during switching-on is achieved.

In a further technical scheme, the bottoms of driving rods of the A-phase circuit breaker, the B-phase circuit breaker and the C-phase circuit breaker are respectively provided with a lug, each lug is provided with an inclined plane section which extends downwards in an inclined mode, and the lower end of each inclined plane section extends downwards to form a straight line section;

a first sliding guide block is arranged on a circuit breaker bottom plate between the A-phase circuit breaker and the B-phase circuit breaker, and a second sliding guide block is arranged on a circuit breaker bottom plate between the B-phase circuit breaker and the C-phase circuit breaker;

the first sliding guide block is provided with an AB phase connecting lock rod capable of sliding left and right, the second sliding guide block is provided with a BC phase connecting lock rod capable of sliding left and right, and the first sliding guide block and the second sliding guide block are provided with an AC phase connecting lock rod capable of sliding left and right;

the end parts of the AB phase interlocking rod, the BC phase interlocking rod and the AC phase interlocking rod are respectively provided with an inclined plane extending in an inclined way, the inclined planes are matched with inclined plane sections of the convex blocks on the corresponding two phase driving rods, and when the driving rod of one phase moves upwards, the corresponding phase interlocking rod is pushed through the inclined plane section arranged on the convex block at the bottom of the driving rod to lock the driving rods of the other two phase circuit breakers.

In a further technical scheme, the first sliding guide block and the second sliding guide block are respectively provided with two sliding guide blocks.

Compared with the prior art, the invention has the following technical effects:

the invention provides a mechanical interlocking method of a switch arc-extinguishing breaker, which is characterized in that a linkage rod is arranged between driving rods of two-phase breakers, and when the driving rod of one phase moves upwards, the driving rods of the other two phases are locked through the linkage rod; the interlocking for preventing the misdrop adopts a mechanical device, particularly rigid interlocking is generated by mechanical parts, and compared with the traditional electrical interlocking, the reliability in the actual operation process is improved.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

Fig. 1 is a schematic structural diagram illustrating a mechanical interlocking device of a switch arc suppression circuit breaker according to an embodiment of the invention;

fig. 2 is a schematic diagram illustrating a state of locking and restraining the C-phase circuit breaker when the a-phase circuit breaker is switched on in the present invention;

fig. 3 is a cross-sectional view illustrating a mechanical interlocking device for a switch arc extinguishing breaker according to an embodiment of the present invention;

the reference numbers in the figures illustrate: the circuit breaker comprises a 1-A phase circuit breaker, a 2-B phase circuit breaker, a 3-C phase circuit breaker, a 4-AB phase interlock rod, a 5-BC phase interlock rod, a 6-AC phase interlock rod, a 7-inclined plane, a 10-circuit breaker bottom plate, 11-a first sliding guide block, 12-a second sliding guide block, a 20-driving rod, a 20 a-first driving rod, a 20B-second driving rod, a 20C-third driving rod, a 30-lug, a 30 a-first lug, a 30B-second lug, a 30C-third lug, a 31-inclined plane section, a 31 a-first inclined plane section, a 31B-second inclined plane section, a 31C-third inclined plane section, a 32-straight line section and a 32 a-first straight line section.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified by combining the specific drawings.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in the foregoing, the method provided by the present invention is used for inter-phase interlocking between the a-phase circuit breaker 1, the B-phase circuit breaker 2, and the C-phase circuit breaker 3; specifically, the method includes that connecting and locking rods are respectively arranged between the driving rods 20 of the A-phase circuit breaker 1 and the B-phase circuit breaker 2, between the driving rods 20 of the A-phase circuit breaker 1 and the C-phase circuit breaker 3 and between the driving rods 20 of the B-phase circuit breaker 2 and the C-phase circuit breaker 3, so that when any one of the A-phase circuit breaker and the C-phase circuit breaker is switched on and the driving rod 20 moves upwards, the corresponding connecting and locking rod is pushed to move towards the driving rods 20 of the other two-phase circuit breaker and is restrained and locked, and therefore the only phase during switching-on is achieved.

As shown in fig. 1 and 3, the method for mechanically interlocking the switch arc suppression circuit breaker provided by the invention is realized by a mechanical interlocking device of the switch arc suppression circuit breaker.

The mechanical interlocking device comprises a circuit breaker bottom plate 10 arranged below an A, B, C three-phase circuit breaker, wherein drive rods 20 respectively extend to the sides of the circuit breaker bottom plate 10 from the A, B, C three-phase circuit breaker, a convex block 30 is mounted at the bottom of the drive rod 20, the convex block 30 is provided with an inclined plane section 31 extending downwards in an inclined mode, and a straight line section 32 extends downwards from the lower end of the inclined plane section 31;

a first sliding guide block 11 is arranged on a breaker bottom plate 10 positioned between the A-phase breaker 1 and the B-phase breaker 2, and a second sliding guide block 12 is arranged on the breaker bottom plate 10 positioned between the B-phase breaker 2 and the C-phase breaker 3;

the first sliding guide block 11 is provided with an AB interlocking rod 4 capable of sliding left and right, the second sliding guide block 12 is provided with a BC interlocking rod 5 capable of sliding left and right, and the first sliding guide block 11 and the second sliding guide block 12 are provided with an AC interlocking rod 6 capable of sliding left and right;

the end parts of the AB connecting and locking rod 4, the BC connecting and locking rod 5 and the AC connecting and locking rod 6 are respectively provided with an inclined plane 7 extending obliquely, the inclined planes 7 are matched with inclined plane sections 31 of the convex blocks 30 on the corresponding two phases of driving rods, and when the driving rod of one phase moves upwards, the inclined plane section 31 arranged on the convex block 30 at the bottom of the driving rod pushes the corresponding interphase connecting and locking rod to lock the driving rods of the other two phases of circuit breakers.

Specifically, as shown in fig. 1, when the a-phase circuit breaker 1 is switched on, the first driving rod 20a of the a-phase circuit breaker 1 moves upward, so as to drive the first protrusion 30a at the bottom of the first driving rod 20a to move upward;

the first inclined surface section 31a of the first projection 30a pushes the AB link lock lever 4 to move to the side of the B-phase breaker 2;

the inclined plane 7 at the end of the AB link 4 abuts against the second inclined plane section 31B of the second projection 30B at the bottom of the second driving rod 20B of the B-phase circuit breaker 2, and forms a constraint with the second inclined plane section to limit the second driving rod 20B of the B-phase circuit breaker 2 to move upwards; when the first driving rod 20a moves upwards continuously, the end of the slope 7 of the AB-phase locking rod 4 close to the a-phase circuit breaker 1 abuts against the first straight line segment 32a of the first bump 30a, and the AB-phase locking rod 4 is locked to move towards one side close to the a-phase circuit breaker 1, so that the upward movement trend of the second driving rod 20B of the B-phase circuit breaker 2 is completely restricted, and the B-phase circuit breaker 2 is locked and can not be switched on after the a-phase circuit breaker 1 is switched on.

Similarly, as shown in fig. 2, when the first driving rod 20a of the a-phase circuit breaker 1 moves upward, the third protrusion 30C at the bottom of the third driving rod 20C of the C-phase circuit breaker 3 is restrained by the AC-connected locking rod 6, so that it cannot move upward; specifically, when the first driving rod 20a moves upward, the first inclined surface section 31a of the first projection 30a at the bottom thereof pushes the AC linking lock lever 6 to move to the C-phase circuit breaker 3, and the inclined surface 7 of the end thereof abuts against the third inclined surface section 31C of the third projection 30C at the bottom of the third driving rod 20C, so as to restrain the third projection 30C and the third driving rod 20C from moving upward; namely, after the A-phase circuit breaker 1 is switched on, the C-phase circuit breaker 3 is locked and can not be switched on.

In the invention, two first sliding guide blocks 11 and two second sliding guide blocks 12 are respectively arranged, thus ensuring the stability of the AB interlocking rod 4, the BC interlocking rod 5 and the AC interlocking rod 6 in the process of moving left and right.

The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.