CN210897027U

CN210897027U - On-load tap-changer energy storage mechanism

Info

Publication number: CN210897027U
Application number: CN201921339493.6U
Authority: CN
Inventors: 吝相军; 许晓宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-06-30
Anticipated expiration: 2029-08-19

Abstract

The utility model discloses an on-load tap-changer energy storage mechanism, including change over switch, the insulating axle of switching that the change over switch internal rotation was equipped with switches the epaxial cam that is equipped with of insulation, and the one end of switching insulating axle is connected with energy storage mechanism, and energy storage mechanism's one end is connected with electric mechanism, and energy storage mechanism includes bedplate and rocking arm, stopper seat, rocking bar axle, buffer, input shaft group, crank group of setting on the bedplate, rotates on the stopper seat and is equipped with the scissors stopper, installs the pivoted rocker on the rocking bar axle. Compared with the prior art, the utility model the advantage lie in: the production efficiency is higher in the practical production process; the structure is relatively simpler, reliable and practical, the service life is long, the failure rate is low, and the action process is broken and sharp; the processing and manufacturing process is low in difficulty and convenient and fast to assemble; the processing and manufacturing cost is reduced; most importantly, the switch risk hidden trouble caused by the fact that the switching switch is stuck or not in place is fundamentally solved.

Description

On-load tap-changer energy storage mechanism

Technical Field

The utility model relates to an electrical switch technical field specifically indicates an on-load tap-changer energy storage mechanism.

Background

In the current power utilization environment of a power grid, the distribution of power utilization loads of power consumers in time and space is uneven; uncertainty of power demand of a power grid for production and life; under the current trend that social electricity consumption is continuously increased and the requirement of power users on the quality of electric energy is increasingly improved, the reliability of each electric power equipment facility participating in electric energy transmission and distribution is improved along with the increase of the social electricity consumption.

An on-load tap changer (abbreviated as "OLTC") called as a transformer heart needs to perform switching and switching of gears under a load (uninterrupted) state in the operation process so as to change the output of voltage (current) by adjusting the number of winding turns on the premise of not changing the input voltage (current) of an inlet wire of a power transformer (or power equipment such as an arc suppression coil and the like needing to adjust the number of winding turns). Therefore, the load switch plays a significant role in the transmission and distribution of electric energy.

The nature of the on-load regulated voltage (current) itself needs to have certain technical capabilities to meet the requirements of power transmission and distribution. Due to on-load voltage regulation (current regulation), power failure can not occur in the whole action process, and the details are shown in an attached figure 1.

(A) The method comprises the following steps The tap changer operates at tap 3, where the load current flows from tap 3 through main circuit K1.

After the OLTC receives the action command, the tap selector starts to act first:

(B) the method comprises the following steps The selection switching is completed by moving from the uncharged 2 nd tap to the 4 th tap. After that, the change-over switch starts to operate:

(C) the method comprises the following steps K2 is closed, and the transition circuit is connected, and then the circulating current Ic is generated, and the transition circuit is connected with the transition resistor R in series, so that the turn-to-turn short circuit of the coil can be avoided;

(D) the method comprises the following steps K1 is disconnected, and the load current flows from the 4 th tap through K2;

(E) the method comprises the following steps The movable contact G is switched from the movable contact G1 to the movable contact G2 under the condition of no load;

(F) the method comprises the following steps K1 is closed again, and the load current flows out from the 4 th tap through K1;

(G) the method comprises the following steps K2 opens and the transition circuit exits operation. At this point, the switch completes a transition shift.

The action of the change-over switch is only 40-60ms (the whole process from the beginning to the transition circuit to the whole gear shifting is finished) (the whole process from fig. 1C to fig. 1G), and the energy and power during the switching are directly provided by the energy storage mechanism which is rigidly connected with the change-over switch, in the process, if the energy storage mechanism has design defects or faults, the change-over switch connected with the change-over switch can directly cause gear clamping risks such as jamming or incomplete switching, the change-over switch can not complete normal switching, the change-over switch is stopped at one section of the switching step, the temperature of the transition resistor is instantly raised, great risks and hidden dangers are brought to the whole operation of the tap-off switch, and the tap-off switch can be burnt seriously. According to the analysis of the burning-out case of the tap changer, more than 70 percent of the burning-out cases are caused by the fact that the change-over switch is blocked or is not switched in place in the switching process.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the defect of above-mentioned technique, provide an on-load tap-changer energy storage mechanism, its simple structure, convenient to use.

In order to solve the technical problem, the utility model provides a technical scheme does: an on-load tap-changer energy storage mechanism comprises a diverter switch, a switching insulating shaft is arranged in the diverter switch in a rotating mode, a cam is arranged on the switching insulating shaft and used for controlling opening and closing devices of K1 and K2, one end of the switching insulating shaft is connected with an energy storage mechanism, one end of the energy storage mechanism is connected with an electric mechanism, the energy storage mechanism comprises a seat plate, a rocker arm, a limiter seat, a rocker shaft, a buffer, an input shaft group and a crank group, the rocker arm is arranged on the seat plate in a rotating mode, the rocker arm is rigidly connected with the switching insulating shaft and is concentric with the axis, a scissors limiter is arranged on the limiter seat in a rotating mode, a reset tension spring is arranged at the tail of the scissors limiter, one end of the rocker arm is in contact fit with the buffer, the other end of the rocker arm is in contact with the head of the scissors limiter, The rocker shaft is arranged on the base plate in a collinear mode, a rotating rocker is arranged on the rocker shaft, an upper pull rod, a lower pull rod and a release shifting shaft are arranged on the rocker, the upper pull rod is connected to the rocker through an energy storage spring, the lower pull rod is connected to the rocker through an energy storage spring II, a connecting rod is arranged on the rocker in a rotating mode, the other end of the connecting rod is connected to a crank set, an input shaft set is connected with the output end of an electric mechanism, the input shaft set is connected with the crank set through gear meshing, and the release shifting shaft smoothly shifts a shear limiting stopper to open an opening of the shear limiting stopper through reciprocating motion of the rocker, so that the release rocker is switched.

As an improvement, the scissors limiters are symmetrically arranged on the limiter base, the tail parts of the scissors limiters are restrained by the outer diameter of a rocker shaft and a return spring which are collinear, and the limiting of the scissors limiters at two limit positions of rocker switching is equally divided.

As an improvement, the included angle formed by the motion of the rocker with the rocker shaft as the center of a circle is in collinear symmetry with the rocker arm, the limiter seat and the rocker shaft.

As an improvement, a small bevel gear is arranged on the input shaft group, and a large bevel gear meshed with the small bevel gear is arranged on the crank group.

Compared with the prior art, the utility model the advantage lie in: through the change of the structure, other external interferences (such as friction force of each contact and relative movement part) which are irrelevant to the main functions of the energy storage mechanism are eliminated in the operation process, the problem of high fault probability existing in the prior complex structure is changed, the energy storage of the energy storage mechanism is fuller, the energy is quickly released to be more profitable and thorough, and the whole energy storage and release process is more stable and reliable; the production efficiency is higher in the practical production process; the structure is relatively simpler, reliable and practical, the service life is long, the failure rate is low, and the action process is broken and sharp; the processing and manufacturing process is low in difficulty and convenient and fast to assemble; the processing and manufacturing cost is reduced; most importantly, the switch risk hidden trouble caused by the fact that the switching switch is stuck or not in place is fundamentally solved.

Drawings

Fig. 1 is a diagram of the operating principle of a prior art on-load tap changer.

Fig. 2 is a schematic structural view of a dry vacuum on-load tap-changer of the energy storage mechanism of the on-load tap-changer of the present invention.

Fig. 3 is a right side view of the structural schematic diagram of the dry vacuum on-load tap-changer of the energy storage mechanism of the on-load tap-changer of the present invention.

Fig. 4 is a cross-sectional view of the utility model discloses an on-load tap-changer energy storage mechanism.

Fig. 5 is a schematic structural diagram of an energy storage mechanism of an on-load tap-changer of the present invention.

Fig. 6 is a structural assembly drawing of the energy storage mechanism of the on-load tap-changer of the present invention.

Fig. 7 is a front view of an on-load tap-changer energy storage mechanism of the present invention.

Fig. 8 is a left side view of the energy storage mechanism of the on-load tap-changer of the present invention.

Fig. 9 is a B-B cross-sectional view of an on-load tap-changer energy storage mechanism of the present invention.

As shown in the figure: 1. the energy storage device comprises an energy storage mechanism, 1.1, a seat plate, 1.11, a release shaft, 1.12, a scissors limiter, 1.13, a reset tension spring, 1.14, a buffer, 1.15, a small bevel gear, 1.16, a large bevel gear, 1.17, an upper pull rod, 1.18, a lower pull rod, 1.2, a rocker arm, 1.3, a limiter base, 1.4, a rocker shaft, 1.5, an input shaft group, 1.6, a crank group, 1.7, a connecting rod, 1.8, a rocker, 1.9, a first energy storage spring, 1.10, a second energy storage spring, 2, a selector switch, 2.1, a switching insulation shaft, 2.2, a cam, 3, a tapping selector and 4, and an electric mechanism.

Detailed Description

The energy storage mechanism of the on-load tap-changer of the present invention will be described in further detail with reference to the accompanying drawings.

With reference to the attached drawings, an on-load tap changer energy storage mechanism comprises a selector switch 2, a switching insulating shaft 2.1 is rotatably arranged in the selector switch 2, a cam 2.2 is arranged on the switching insulating shaft 2.1, the cam 2.2 is used for controlling opening and closing devices of K1 and K2, one end of the switching insulating shaft 2.1 is connected with an energy storage mechanism 1, one end of the energy storage mechanism 1 is connected with an electric mechanism 4, the energy storage mechanism 1 comprises a seat plate 1.1, a rocker arm 1.2, a limiter seat 1.3, a rocker shaft 1.4, a buffer 1.14, an input shaft group 1.5 and a crank group 1.6, the rocker arm 1.2 is rotatably arranged on the seat plate 1.1, the rocker arm 1.2 is rigidly connected with the switching insulating shaft 2.1, the axes of the rocker arm and the rocker arm are concentric, a scissor limiter 1.12 is rotatably arranged on the scissor seat 1.3, a reset tension spring 1.13 is arranged at the tail of the scissor limiter 1.12, one end of the rocker arm 1.2 is in contact with the buffer 1.14, the other end of the, the installation positions of the rocker arm 1.2, the limiter base 1.3 and the rocker shaft 1.4 on the base plate 1.1 are collinear, the shear limiters 1.12 are symmetrically installed on the limiter base 1.3, the tail parts of the shear limiters 1.12 restrict the positions through the outer diameter of the collinear rocker shaft 1.4 and the reset spring 1.13, the limits of the shear limiters 1.12 on two limit positions switched by the rocker arm 1.2 are equally divided, the rocker shaft 1.4 is provided with a rotating rocker 1.8, the rocker 1.8 is provided with an upper pull rod 1.17, a lower pull rod 1.18 and a release toggle shaft 1.11, the upper pull rod 1.17 is connected to the rocker arm 1.2 through a first energy storage spring 1.9, the lower pull rod 1.18 is connected to the rocker arm 1.2 through a second energy storage spring 1.10, the rocker arm 1.8 is provided with a connecting rod 1.7 in a rotating way, the other end of the connecting rod 1.7 is connected to a crank set 1.6, an input shaft set 1.5 is connected with the output end of the electric mechanism 4, an input shaft set 1.5 is meshed with a crank shaft set through a gear set, and a, the crank set 1.6 is provided with a large bevel gear 1.16 meshed with a small bevel gear 1.15, the release toggle shaft 1.11 smoothly toggles the scissors limiter 1.12 to open the opening of the scissors limiter through the reciprocating motion of the rocker 1.8, so that the rocker 1.2 is released to be switched, and an included angle formed by the motion of the rocker 1.8 by taking the rocker shaft 1.4 as a circle center is in collinear symmetry with the rocker 1.2, the limiter seat 1.3 and the rocker shaft 1.4.

When the utility model is implemented in detail,

the whole working process principle of switching the OLTC from the 3 rd tapping position to the 4 th tapping is described in detail with reference to the attached drawing 1 of the specification;

with reference to fig. 2, 3 and 4 of the specification, a switching insulating shaft 2.1 capable of rotating freely is arranged in the switch 2, a switching device cam 2.2 and a moving contact G of K1 and K2 are fixed on the switching insulating shaft 2.1, and a shaft head of the switching insulating shaft 2.1 is rigidly connected to a rocker arm 1.2 of the energy storage mechanism 1, so that the reciprocating rotation of the switching insulating shaft 2.1 can control the opening and closing of K1 and K2 and the switching operation of the moving contact G between a fixed contact G1 and a fixed contact G2;

5, 6, 7, 8 and 9 in the specification, a rocker arm 1.2, a limiter base 1.3, a rocker shaft 1.4, a buffer 1.14, an input shaft group 1.5 and a crank group 1.6 are arranged on a frame of a base plate 1.1 or other fixed parts, and the installation and fixing positions of the rocker arm 1.2, the limiter base 1.3 and the rocker shaft 1.4 on the base plate 1.1 are collinear; the small bevel gear 1.15 on the input shaft group 1.5 is meshed with the large bevel gear 1.16 on the crank group 1.6 to transmit power;

a pair of scissors limiters 1.12 which can rotate around the limiter base 1.3 are arranged on the limiter base 1.3 and symmetrically arranged, a reset tension spring 1.13 is arranged at the tail of the scissors limiter 1.12, the tail of the scissors limiter 1.12 is restricted by matching the outer diameter of a rocker shaft 1.4 with the reset spring 1.13 in an initial state to prevent random swinging, at the moment, the head plane of the scissors limiter 1.12 just props against the rocker arm 1.2, the other end of the rocker arm 1.2 props against the head of a buffer 1.14, and the positions of the rocker arm 1.2, the limiter base 1.3 and the rocker shaft 1.4 on the base plate 1.1 are fixed, the scissors limiters 1.12 are symmetrically arranged on the limiter base 1.3, and the tail of the scissors limiter base 1.12 is restricted by the outer diameter of the collinear rocker shaft 1.4 and the reset spring 1.13, so that the limits of the scissors limiter 1.12 at two limit positions switched by the rocker arm 1.2 are equally divided;

a rotating rocker 1.8 is mounted on a rocker shaft 1.4, an upper pull rod 1.17, a lower pull rod 1.18 and a release toggle shaft 1.11 are arranged on the rocker 1.8, the release toggle shaft 1.11 can smoothly toggle a shear limiter 1.12 to open an opening of the shear limiter through reciprocating motion of the rocker 1.8, the rocker is released to be switched, the upper pull rod 1.17 and the lower pull rod 1.18 are connected to a rocker arm 1.2 through an energy storage spring I1.9 and an energy storage spring II 1.10, the other side of the rocker 1.8 is connected to a crank set 1.6 through a connecting rod 1.7, and an included angle formed by motion of the rocker 1.8 by taking the rocker shaft 1.4 as a circle center is collinear symmetry with respect to the rocker arm 1.2, the limiter base 1.3 and the rocker shaft 1.4; power passes through the input shaft group 1.5, the small bevel gear 1.15, the large bevel gear 1.16, the crank group 1.6 and the connecting rod 1.7, the connecting rod 1.8 performs reciprocating rotation operation, meanwhile, the rocker 1.8 pulls the energy storage spring I1.9 and the energy storage spring II 1.10 through the upper pull rod 1.17 and the lower pull rod 1.18 to store energy, after the stored energy is saturated, the release shaft 1.11 on the rocker 1.8 stirs the scissors limiter 1.12 to open the scissors, the rocker 1.2 is released, and the rocker 1.2 drives the switching insulating shaft 2.1 to switch to the other side under the driving of energy.

The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.

Claims

1. The utility model provides an on-load tap-changer energy storage mechanism, includes change over switch, the insulating axle of switching that the change over switch internal rotation was equipped with, switch over the epaxial cam that is equipped with, the cam is used for controlling K1, K2's switching device, the one end of switching insulating axle is connected with energy storage mechanism, energy storage mechanism's one end is connected with electric mechanism, its characterized in that: the energy storage mechanism comprises a seat plate, and a rocker arm, a limiting seat, a rocker shaft, a buffer, an input shaft group and a crank group which are arranged on the seat plate, wherein the rocker arm is arranged on the seat plate in a rotating manner, the rocker arm is rigidly connected with a switching insulating shaft, the axis of the rocker arm is concentric, a shear limiting device is arranged on the limiting seat in a rotating manner, a reset tension spring is arranged at the tail part of the shear limiting device, one end of the rocker arm is in contact fit with the buffer, the other end of the rocker arm is in contact with the head part of the shear limiting device, the rocker arm, the limiting seat and the mounting position of the rocker shaft on the seat plate are collinear, a rotating rocker arm is arranged on the rocker shaft, an upper pull rod, a lower pull rod and a release toggle shaft are arranged on the rocker arm, the upper pull rod is connected to the rocker arm through an energy storage spring, the lower pull rod, the input shaft group is connected with the output end of the electric mechanism, the input shaft group is connected with the crank group through gear engagement, and the release shifting shaft smoothly shifts the shear limiting stopper to open the opening of the shear limiting stopper through the reciprocating motion of the rocker, so that the release rocker is switched.

2. An on-load tap changer energy storage mechanism according to claim 1, characterized in that: the scissors limiters are symmetrically arranged on the limiter base, the tail parts of the scissors limiters are restrained by the outer diameter of a rocker shaft and a return spring which are collinear, and the limiting of the scissors limiters at two limiting positions switched by the rocker arm is equally divided.

3. An on-load tap changer energy storage mechanism according to claim 1, characterized in that: the rocker arm takes the rocker shaft as the center of a circle to form an included angle which is collinear and symmetrical with respect to the rocker arm, the limiter seat and the rocker shaft.

4. An on-load tap changer energy storage mechanism according to claim 1, characterized in that: the input shaft set is provided with a small bevel gear, and the crank set is provided with a large bevel gear meshed with the small bevel gear.