CN217719483U

CN217719483U - Electric control current-limiting fuse

Info

Publication number: CN217719483U
Application number: CN202221351267.1U
Authority: CN
Inventors: 袁晶; 汪贝; 钱旭博
Original assignee: Wuhan Sidebao Electric Co ltd
Current assignee: Wuhan Sidebao Electric Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-11-01
Anticipated expiration: 2032-05-30

Abstract

The utility model provides an automatically controlled current limiting fuse, include: the breaker comprises an insulating shell and a conductor penetrating through the insulating shell, wherein a breaking grid piece and a gas generating device are sequentially arranged in the insulating shell above the conductor, and an avoidance groove is arranged in the insulating shell below the conductor; arc-extinguishing fuses respectively connected to both ends of the conductor; and the electronic measurement and control device is arranged outside the insulating shell and comprises a Hall element, a main control chip and an isolation ignition circuit which are electrically connected, wherein the Hall element detects the current flowing on the electric conductor, and the main control chip is used for controlling the isolation ignition circuit to trigger the gas generating device and drive the grid-breaking piece to cut off the electric conductor when the current flowing on the electric conductor is overloaded. The utility model has the advantages that: the current automatic detection and automatic breaking are realized, the response speed is high, an external trigger signal is not required, and the problem of low response speed of the delay fuse caused by triggering the breaker by an external current detection unit is solved.

Description

Electric control current-limiting fuse

Technical Field

The utility model relates to a circuit protection device technical field especially relates to an automatically controlled current limiting fuse.

Background

The wind power master control system is an important component of a fan power system, plays important roles of monitoring and controlling a fan, automatically adjusting, realizing maximum wind energy capture, ensuring good power grid compatibility and the like, and mainly comprises a monitoring system, a fan master controller, a variable current control and converter, switching equipment, a transformer and the like.

The environment of the wind power plant is relatively severe. Particularly, on the outlet side of the generator, the working frequency is lower, the loop inductance is larger, and the equipment space is smaller. Once a short-circuit fault occurs inside the generator or inside the converter, the short-circuit and overcurrent protection needs to be performed quickly, and the existing applicable switching equipment is triggered by an external current detection unit, so that the delay of signal output is high, the response speed of a fuse is low, the situation that the protection is not in time may occur, and the safety of a power system cannot be effectively guaranteed.

SUMMERY OF THE UTILITY MODEL

In view of this, rely on outside current detection unit to trigger in order to solve the switchgear of wind-powered electricity generation electric field, the problem that the fuse response speed is slow that the delay of signal output is higher leads to, the embodiment of the utility model provides an automatically controlled current-limiting fuse.

An embodiment of the utility model provides an automatically controlled current limiting fuse, include:

the breaker comprises an insulating shell and a conductor penetrating through the insulating shell, wherein a breaking grid piece and a gas generating device connected with the breaking grid piece are sequentially arranged above the conductor in the insulating shell, and an avoidance groove is arranged below the conductor in the insulating shell;

the arc-extinguishing fuse is respectively connected with two ends of the electric conductor, and quartz sand is arranged inside the arc-extinguishing fuse;

and the electronic measurement and control device is arranged outside the insulating shell and comprises a Hall element, a main control chip and an isolation ignition circuit which are electrically connected, wherein the Hall element is arranged on one side of the electric conductor to detect the current flowing on the electric conductor, the isolation ignition circuit is connected with the gas generating device, and the main control chip is used for controlling the isolation ignition circuit to trigger the gas generating device and drive the grid-breaking piece to cut off the electric conductor when the current flowing on the electric conductor is overloaded.

Further, the breaker still includes the guide holder, the guide holder set up in break the bars piece with between the gas generating device, guide holder upper portion is equipped with a plurality of guide posts, the guide post slide set up in the insulating casing, gas generating device support in on the guide holder, the guide holder lower part with break bars piece upper portion and offset.

Furthermore, the guide seat is in a round table shape, a Y-shaped limiting hole penetrating through the middle of the guide seat is formed in the middle of the guide seat, and the lower portion of the gas generating device is embedded into the limiting hole.

Furthermore, the guide posts are uniformly distributed around the axis of the guide seat, a plurality of guide holes in the vertical direction are formed in the inner wall of the insulating shell, and the upper end of each guide post is accommodated in one guide hole and can slide.

Furthermore, the upper part of the breaking grid sheet is provided with a cylindrical stress head, and the bottom surface of the guide seat is attached to the top surface of the stress head.

Furthermore, a straight plate-shaped cutter is arranged at the lower part of the breaking grid piece, a groove is formed in the electric conductor, and the cutter and the groove are arranged in an up-and-down opposite mode.

Further, the dodging groove is a T-shaped stepped groove, an expansion opening is formed in the upper portion of the dodging groove, and the breaking grid piece cuts off the groove, so that the edge portion of the groove at the breakage opening is bent and deviated in the expansion opening.

Furthermore, the groove is a strip-shaped groove arranged along the width direction of the electric conductor, and the cross section of the groove is rectangular or V-shaped.

Furthermore, two ends of the arc-extinguishing fuse are respectively connected with two ends of the conductor through two connecting plates, the connecting plates are L-shaped, one side of each connecting plate is attached to the bottom surface of the conductor, and the other side of each connecting plate is attached to one side of the arc-extinguishing fuse.

Furthermore, the electronic measurement and control device is located on the electric conductor and is connected with the gas generating device through a lead.

The embodiment of the utility model provides a technical scheme brings the beneficial effect be: the utility model discloses an automatically controlled current limiting fuse, through the electric current that electronic measurement and control device real-time detection flows through the electric conductor, trigger the breaker immediately when short circuit and overcurrent, realize electric current automated inspection and automatic breaking, response speed is fast, need not rely on external trigger signal, has solved the problem that delay fuse response speed is slow that external current detecting element triggered the breaker and leads to; and the arc-extinguishing fuse is used for final breaking of current, so that the arc-extinguishing fuse is suitable for breaking of high-voltage large current, and the breaking reliability of the current is improved.

Drawings

FIG. 1 is a schematic diagram of an electrically controlled current limiting fuse of the present invention;

fig. 2 is a perspective view of an electrically controlled current limiting fuse of the present invention;

FIG. 3 is a top view of an electrically controlled current limiting fuse of the present invention;

FIG. 4 isbase:Sub>A schematic sectional view taken along line A-A of FIG. 3;

fig. 5 is a schematic circuit diagram of the electronic measurement and control device 3 in fig. 1.

In the figure: 1-breaker, 101-upper outer shell, 102-lower inner shell, 103-lower outer shell, 104-conductor, 105-groove, 106-stress head, 107-cutter, 108-guide seat, 109-gas generating device, 110-connector, 111-guide column, 112-guide hole, 113-inner bushing, 114-inner pawl, 115-outer pawl, 116-avoidance groove, 2-arc-extinguishing fuse, 201-connecting plate and 3-electronic measuring and controlling device.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described with reference to the accompanying drawings. The following description is of the preferred embodiment of the present invention and is provided to enable a person of ordinary skill in the art to make and use the invention and is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

An embodiment of the utility model provides an automatically controlled current-limiting fuse is applied to the overcurrent protection of wind-powered electricity generation side system or net side system of wind-powered electricity generation electric field in this embodiment, can understand that it can also be adapted to in other high-low voltage distribution systems that require fast, divide the stable reliability of branch to expect high to the speed of dividing, like electric automobile's electrical system, its application scope does not receive the utility model discloses specific embodiment limits.

Referring to fig. 1 and 2, an embodiment of the present invention provides an electrically controlled current-limiting fuse, which mainly includes an interrupter 1, an arc-extinguishing fuse 2, and an electronic measurement and control device 3.

As shown in fig. 3 and 4, the breaker 1 includes an insulating case, a conductive body 104, a breaking gate, a guide 108, a gas generating device 109, and an avoidance groove 116. The conductive body 104 penetrates through the insulating housing, the breaking grid, the guide seat 108 and the gas generating device 109 are arranged in the insulating housing and above the conductive body 104, and the avoiding groove 116 is arranged in the insulating housing and below the conductive body 104.

The insulating shell is of a hollow structure made of insulating materials. As shown in fig. 4, the insulating housing in this embodiment specifically includes an upper outer shell 101, a lower inner shell 102, and a lower outer shell 103, which are sequentially connected from top to bottom.

The conductor 104 traverses the insulating housing and is fixed, and both ends of the conductor extend out of the insulating housing. The conductive body 104 is located between the upper outer shell 101 and the lower inner shell 102, and is clamped and fixed by the upper outer shell 101 and the lower inner shell 102. Generally, both ends of the conductor 104 are connected to a main circuit to be protected.

And the surface of the conductive body 104 is provided with a groove 105. Specifically, the conductor 104 is a straight-plate-shaped copper bar, and is integrally processed and formed, so that the conductor 104 has small overall resistance and strong flow capacity. The groove 105 may be formed on the upper surface of the conductor 104, or may be formed on the lower surface of the conductor 104, and the groove 105 functions to form a weak portion that is easily cut on the conductor 104.

As shown in fig. 4, in the present embodiment, the groove 105 is a strip-shaped groove disposed along the width direction of the conductive body 104, and the groove 105 is disposed on the upper surface of the conductive body 104. The cross-sectional shape of the groove 105 can be flexibly set, such as rectangular or V-shaped, so that the thickness of the conductive body 104 at the position of the groove 105 is obviously reduced, and an obvious weak point is formed.

The breaking grid, the guide seat 108 and the gas generating device 109 are all arranged in the inner cavity of the upper shell 101 and above the conductor 104. Specifically, the cut-off gate is located right above the trench 105. The upper part of the breaking grid sheet is provided with a cylindrical stress head 106, and the lower part of the breaking grid sheet is provided with a straight plate-shaped cutter 107. The force-bearing head 106 is mounted in the inner cavity of the upper housing 101. The cutting blade 107 is disposed opposite to the groove 105, or the lower end of the cutting blade 107 directly extends into the groove 105 to contact with the groove 105.

In order to guarantee the grid piece of opening cuts off steadily slot 105, stress head 106 outer wall is equipped with outer pawl 115, go up the inside inner bush 113 that is equipped with of shell 101, inner bush 113 encircles the grid piece lower part of opening and inner wall are equipped with interior pawl 114, outer pawl 115 with interior pawl 114 looks adaptation the cutter 107 cuts off insert behind the slot 105 dodge groove 116, outer pawl 115 blocks just into interior pawl 114, the two blocks each other and dies. Thus, the air pressure generated when the opening grid sheet cuts the groove 105 is prevented from rebounding the opening grid sheet, and a reliable breaking effect is ensured.

The guide seat 108 and the gas generating device 109 are disposed above the gate. The guide seat 108 is in a truncated cone shape, and the bottom surface of the guide seat is attached to the top surface of the stress head 106. The shape of the bottom surface of the guide seat 108 is the same as the shape of the top surface of the breaking bar, that is, the shape of the top surface of the force head 106, so as to better transmit the force of the gas generating device 109.

The guide seat 108 is provided with a plurality of guide posts 111 at the upper part, and preferably, the guide posts 111 are uniformly distributed around the axis of the guide seat 108. The inner wall of the upper casing 101 is provided with a plurality of guide holes 112 in the vertical direction, the guide holes 112 correspond to the guide posts 111 one by one, the upper end of each guide post 111 is accommodated in one guide hole 112 and can slide, and the guide seat 108 can stably move vertically and downwardly under the constraint action of each guide hole 112 on each guide post 111.

The middle part of the guide seat 108 is provided with a Y-shaped limiting hole which penetrates through the guide seat 108, the lower part of the gas generating device 109 is embedded into the limiting hole, so that the gas generating device 109 is supported on the guide seat 108, the gas generating device 109 is driven to move downwards after being triggered, the guide seat 108 uniformly transmits the acting force of the gas generating device 109 to the stress head 106, and the breaking grid piece can stably move downwards vertically.

The gas generating device 109 is specifically an initiating explosive device, which is provided with a connector 110, and the connector 110 is mounted on the surface of the insulating shell. As shown in fig. 4, the connector 110 is installed at the upper port of the upper casing 101, and the connector 110 is used for connecting the electronic measurement and control device 3.

As shown in fig. 4, the avoiding groove 116 penetrates through the lower inner housing 102, specifically, is located right below the groove 105. Dodge groove 116 for the stepped groove of T shape cutter 107 downstream cuts off behind the slot 105, get into dodge the inslot 116. An enlarged opening is formed in the upper portion of the avoiding groove 116, and when the groove 105 is cut off by the breaking grid piece, the edge portion of the broken opening of the groove 105 is bent and deflected into the enlarged opening. Therefore, the broken edge part of the groove 105 after being cut can be prevented from generating a squeezing action with the cutting knife 107, and the downward movement of the broken grid piece can be prevented from being influenced.

The arc-extinguishing fuse 2 is arranged below the breaker 1, and quartz sand is filled in the arc-extinguishing fuse 2. Specifically, two ends of the arc-extinguishing fuse 2 are respectively connected with two ends of the conductor 104 through two connecting plates 201, each connecting plate 201 is L-shaped, one side of each connecting plate is attached to the bottom surface of the conductor 104, and the other side of each connecting plate is attached to one side of the arc-extinguishing fuse 2.

When a short-circuit current or an overcurrent passes through the conductor 104, an arc generated instantaneously after the groove 105 is cut is transferred to the arc-extinguishing fuse 2, and the quartz sand having a large energy to absorb the arc in the arc-extinguishing fuse 2 absorbs the arc energy, so that the arc is rapidly extinguished, safely and reliably. The arc-extinguishing fuse 2 does not need to bear a through-current task and does not pass through load current in a normal state during normal operation, so that the heating problem does not need to be considered.

The electronic measurement and control device 3 is used for monitoring the current passing through the conductor 104 in real time, and immediately outputting a trigger signal to the gas generation device 3 once fault current characteristics such as short circuit and overcurrent are detected. The electronic measurement and control device 3 is arranged outside the insulating shell, is fixedly seated on the conductor 104, and is connected with the gas generating device 109 through a lead.

As shown in fig. 5, the electronic measurement and control device 3 specifically includes a power supply circuit for supplying power, and a hall element, a main control chip, and an isolation ignition circuit that are electrically connected, where the hall element is disposed on one side of the conductor to detect a current flowing through the conductor, the isolation ignition circuit is connected to the connector 110 of the gas generation device 109 through a wire, and the main control chip is configured to control the isolation ignition circuit to trigger the gas generation device 109 and drive the switching gate to switch off the conductor 104 when the current flowing through the conductor 104 is overloaded. The power supply circuit and the isolation ignition circuit are common functional circuits and can be flexibly selected according to actual needs.

When the main circuit works normally, current flows through the conductor 104 of the breaker 1 and does not flow through the arc-extinguishing fuse 2, and the arc-extinguishing fuse 2 does not need to bear the current flowing task when the main circuit works normally;

when the main circuit is in a short circuit or overcurrent working condition, the electronic measurement and control device 3 detects the current flowing through the conductor 104, and after the condition that overload or short circuit occurs is judged, a trigger signal is sent to the gas generating device 109 to trigger the gas generating device, so that the breaking grid piece is driven to cut off the conductor 104 to form a fracture at the groove 105, arc voltage is established, the current is switched to the arc-extinguishing fuse 2, the arc-extinguishing fuse 2 breaks the short-circuit current, and the arc-extinguishing fuse 2 is responsible for final breaking of the current and is a final executing component for current breaking.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that they are relative concepts that may be modified in various manners of use and placement and that the use of directional terms should not be taken to limit the scope of what is claimed.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. An electrically controlled current limiting fuse, comprising:

and the electronic measurement and control device is arranged outside the insulating shell and comprises a Hall element, a main control chip and an isolation ignition circuit which are electrically connected, wherein the Hall element is arranged on one side of the electric conductor to detect the current flowing on the electric conductor, the isolation ignition circuit is connected with the gas generating device, and the main control chip is used for controlling the isolation ignition circuit to trigger the gas generating device and driving the switching-off grid piece to switch off the electric conductor when the current flowing on the electric conductor is overloaded.

2. An electrically controlled current limiting fuse as recited in claim 1 wherein: the breaker further comprises a guide seat, the guide seat is arranged between the breaking grid piece and the gas generating device, a plurality of guide columns are arranged on the upper portion of the guide seat, the guide columns are arranged in the insulating shell in a sliding mode, the gas generating device is supported on the guide seat, and the lower portion of the guide seat is abutted to the upper portion of the breaking grid piece.

3. An electrically controlled current limiting fuse as recited in claim 2 wherein: the guide seat is in a round table shape, a Y-shaped limiting hole penetrating through the guide seat is formed in the middle of the guide seat, and the lower portion of the gas generating device is embedded into the limiting hole.

4. An electrically controlled current limiting fuse as recited in claim 2 wherein: the guide posts are uniformly distributed around the axis of the guide seat, a plurality of guide holes in the vertical direction are formed in the inner wall of the insulating shell, and the upper end of each guide post is accommodated in one guide hole and can slide.

5. An electrically controlled current limiting fuse as recited in claim 2, wherein: the upper part of the breaking grid piece is provided with a cylindrical stress head, and the bottom surface of the guide seat is attached to the top surface of the stress head.

6. An electrically controlled current limiting fuse as recited in claim 1, wherein: the lower part of the breaking grid piece is provided with a straight plate-shaped cutter, the conductor is provided with a groove, and the cutter and the groove are arranged oppositely up and down.

7. An electrically controlled current limiting fuse as recited in claim 6, wherein: the dodge groove is the ladder groove of T shape, and upper portion is equipped with enlarges the mouth, it cuts off to cut off the bars piece make during the slot the marginal portion of slot fracture department is buckled to incline to enlarge in the mouth.

8. An electrically controlled current limiting fuse as defined in claim 6, wherein: the groove is a strip-shaped groove arranged along the width direction of the electric conductor, and the cross section of the groove is rectangular or V-shaped.

9. An electrically controlled current limiting fuse as recited in claim 1, wherein: the two ends of the arc-extinguishing fuse are respectively connected with the two ends of the electric conductor through two connecting plates, the connecting plates are L-shaped, one side of each connecting plate is connected with the bottom surface of the electric conductor in an attaching mode, and the other side of each connecting plate is connected with one side of the arc-extinguishing fuse in an attaching mode.

10. An electrically controlled current limiting fuse as recited in claim 1, wherein: the electronic measurement and control device is located on the electric conductor and is connected with the gas generating device through a lead.