CN212012124U

CN212012124U - SPD backup protection device

Info

Publication number: CN212012124U
Application number: CN202020497152.8U
Authority: CN
Inventors: 匡文敏
Original assignee: Jiangxi Leierdunwei Electric Co ltd
Current assignee: Jiangxi Leierdunwei Electric Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-11-24
Anticipated expiration: 2030-04-08

Abstract

The utility model discloses a SPD backup protection device, including little power frequency current short circuit breaking device rapidly, thunderbolt impact current bleeder mechanism and arc-extinguish chamber, breaking device contains one set of tripping device, there is an NTC thermistor in the magnetic line of force circle circuit of tripping device cluster, the arc-extinguish chamber is in one side of thunderbolt impact current bleeder mechanism, and the tip is equipped with 2 high energy tungsten copper contacts. In the utility model, the tungsten-copper high-energy contact is adopted, so that the whole protector can increase the corrosion resistance of the contact after passing through the lightning strike impact current through a larger lightning strike impact current, and simultaneously, the residual pressure of the lightning strike impact current of the internal structure of the protector is reduced; a special gas discharge tube for T1 is adopted to realize larger lightning strike impact current; in order to ensure the use safety of the whole system, the protector can be provided with an auxiliary contact, the normally closed auxiliary function of the monitoring equipment in a remote state can be realized, the running condition of the equipment can be monitored in real time, and the labor cost is reduced.

Description

SPD backup protection device

Technical Field

The utility model relates to an electrical protection subassembly field especially relates to a I type (30kA) SPD backup protector.

Background

Thunder is a special weather phenomenon caused by the discharge of charged cloud in the air, thunder is an important reason causing the damage of electronic equipment, and threatens the safe and stable operation of electronic information systems in various fields such as buildings, railways, civil aviation, communication, industrial control, military and the like, and Surge Protection Devices (SPD) are arranged on metal circuits such as power lines, signal lines, control lines and the like connected with the electronic equipment, so that the surge protection devices are one of important measures for lightning protection, are widely applied to various fields, have important functions in the lightning protection, and directly influence the lightning protection effect of the lightning protection devices according to the state of the surge protection devices, thereby bringing hidden danger to the safety of the protected equipment.

The backup protection device of the existing SPD usually adopts a fuse or a circuit breaker for breaking the SPD short-circuit fault path, but when a power supply system fault, an SPD overcurrent short circuit and a power frequency current pass through, the current value of the backup protection device may not reach the starting value of the overcurrent protection device, the overcurrent protection device does not act, so that the power frequency current continuously passes through, the SPD is heated by the lightning protection element to be ignited, if the starting value of the overcurrent protection device is selected to be small, the backup protection device can be started but is difficult to resist the impact of the lightning current, so that the SPD cannot normally discharge the lightning current, the existing overcurrent protection device has a serious blind area for protecting the SPD, and the overcurrent protection device does not act in the area and cannot break the SPD fault.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a SPD backup protection device.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the SPD backup protection device comprises a small power frequency current short circuit rapid breaking device, a lightning stroke impact current discharge device and an arc extinguishing cover, wherein the breaking device comprises a set of tripping mechanism, an NTC thermistor is connected in series on a magnetic line loop of the tripping mechanism, a gas discharge tube is arranged in the middle of an inner cavity of the lightning stroke impact current discharge device, the arc extinguishing cover is arranged on one side of the lightning stroke impact current discharge device, and a high-energy tungsten-copper contact is arranged at the end part of the arc extinguishing cover.

As a further description of the above technical solution:

the upper portion of the SPD backup protection device is connected with a switch handle, a handle pull rod is fixedly arranged at the end portion of the switch handle, a wire inlet through hole and vent holes are formed in the end portion of the SPD backup protection device, the edges of the wire inlet through hole are chamfered, the vent holes guarantee that gas can be rapidly discharged from the hole after being expanded when lightning strike current passes through the vent holes, and the SPD backup protection device cannot be cracked due to gas expansion.

As a further description of the above technical solution:

the wire support is arranged on the side wall of an inner cavity of the SPD backup protection device, a wire pressing bolt is embedded in the top of the wire support, a lightning strike current discharging device is connected to the right side of the wire support, a magnetic coil is arranged on the upper portion of the lightning strike current discharging device, and an NTC thermistor is connected to the magnetic coil in series.

As a further description of the above technical solution:

the top of an inner cavity of the SPD backup protection device is provided with a switch handle, a switch guide rod is arranged on the outer side of a rotating shaft of the switch handle, the switch guide rod is made of steel and subjected to surface passivation treatment, the switch guide rod is connected with a small power frequency current short circuit rapid breaking device, the lower end of the small power frequency current short circuit rapid breaking device is connected with a tungsten-copper high-energy contact, the bottom of the tungsten-copper high-energy contact is provided with an electric arc guide groove, an arc extinguishing cover is arranged below the electric arc guide groove, and a flame-retardant partition plate is arranged below the arc extinguishing cover.

As a further description of the above technical solution:

the allowable lightning current range of the tungsten-copper high-energy contact and the lightning surge current relief device is 0kA-30 kA.

As a further description of the above technical solution:

the bottom of the SPD backup protection device is provided with four groups of installation chutes, the number of the SPD backup protection devices can be selected according to actual use conditions to be arranged in parallel, the installation chutes are dovetail grooves, and auxiliary contact installation holes are formed in the side faces of the SPD backup protection device, so that the working state of the backup protector can be monitored in real time.

As a further description of the above technical solution:

the electric arc that the electric arc guide slot will produce leads the arc extinguishing chamber, the inflation gas via the air vent discharges outside the reserve protector, and fire-retardant baffle then ensures that electric arc eliminates inside equipment, guarantees the wholeness ability of whole reserve protector, avoids arousing entire system's damage.

Advantageous effects

1. In the utility model, 2 tungsten-copper high-energy contacts are adopted, so that the whole equipment has larger impact current, and the generation of higher residual voltage in the equipment is avoided;

2. in the utility model, the lightning strike impact current relief device adopts a special T1 gas discharge tube, realizes larger impact current, can meet the lightning strike impact current between class I0 kA-30kA, and ensures the use safety of the whole equipment;

3. in the utility model, the operation condition of the equipment can be monitored in real time by monitoring the normally closed auxiliary function of the equipment in a remote state, so that the labor cost is reduced;

4. the utility model discloses in, through improving little power frequency current short circuit breaking apparatus rapidly, the cluster has an NTC thermistor on tripping device's magnetic line of force circle circuit, when avoiding the thunderbolt to produce, and the electric current arouses the malfunction through magnetic line of force circle, and more accurate reliable realization is disconnected.

Principle of operation

When using this SPD backup protector, at first assemble whole equipment, and with whole equipment through installation spout slidable mounting among the block terminal, later fix whole equipment through fixing hole, later send components such as wire into among the equipment through the inlet wire through-hole, compress tightly bolt and wire support through the wire and carry out fixed mounting, open switch wrench through integrative pull rod with whole equipment, thereby realize that whole equipment begins work, in the time of work, the arc extinguishing cover can avoid the production of electric arc, clearance discharge device can avoid equipment to expose, thereby realize better security.

Drawings

Fig. 1 is a front view of a SPD backup protection device proposed by the present invention;

fig. 2 is a main structure diagram of the SPD backup protection device provided by the present invention;

fig. 3 is the internal structure diagram of the SPD backup protection device provided by the present invention.

Illustration of the drawings:

1. a handle pull rod; 2. a switch handle; 3. a switch guide; 4. a small power frequency current short circuit rapid breaking device; 5. a magnetic coil; 6. a wire hold down pin; 7. a wire holder; 8. installing a chute; 9. a lightning strike current relief device; 10. an arc extinguishing chamber; 11. a flame retardant separator plate; 12. a tungsten copper high energy contact; 13. an arc chute; 14. a wire inlet through hole; 15. a vent; 16. auxiliary contact mounting holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; 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 in specific cases to those skilled in the art.

Referring to fig. 1-3, the SPD backup protection device includes a small power frequency current short circuit rapid breaking device 4, a lightning strike impact current discharging device 9 and an arc-extinguishing cover 10, the breaking device 4 includes a set of tripping mechanism, an NTC thermistor is connected in series on a magnetic coil loop of the tripping mechanism to absorb induced lightning strike current, a gas discharge tube is included in the middle of an inner cavity of the lightning strike impact current discharging device 9, and the arc-extinguishing cover 10 is provided with 2 tungsten-copper high-energy contacts 12 at one side of the lightning strike impact current discharging device 9. The tungsten-copper high-energy contact is adopted, so that the whole protector can pass larger lightning stroke impact current, the corrosion resistance of the contact after passing the lightning stroke impact current is improved, and the residual voltage of the lightning stroke impact current of the internal structure of the protector is reduced; the lightning strike impact current relief device 9 adopts a T1 special gas discharge tube to realize larger lightning strike impact current, the special gas discharge tube can bear T1 lightning strike current between 0kA and 30kA, the tungsten-copper high-energy contact 12 is switched on and off through the small power frequency current short circuit rapid breaking device 4, under the condition of SPD short circuit, power frequency current 3A is rapidly broken, short circuit fire is prevented, under the condition that lightning strike impact current comes, the lightning strike impact current relief device 9 quickly relieves, remote monitoring can be adopted, and normal close assistance is utilized to realize real-time monitoring.

The upper part of the SPD backup protection device is connected with a switch handle 2, the end part of the switch handle 2 is fixedly provided with a handle pull rod 1, the end part of the SPD backup protection device is provided with a wire inlet through hole 14, vent holes 15 are formed, the edges of the wire inlet through hole 14 are all chamfered, the vent holes 15 ensure that gas can be rapidly discharged from the hole after the gas expands when lightning current flows, the SPD backup protection device cannot be burst due to the gas expansion, the bottom of the SPD backup protection device is provided with mounting chutes 8, the number of the SPD backup protection devices is four, the number of the SPD backup protection devices can be selected according to actual use conditions and arranged in parallel, the mounting chutes 8 are dovetail grooves, the side surface of the SPD backup protection device is provided with auxiliary contact mounting holes 16, the real-time monitoring of the working state of the SPD backup protection device can, a wire pressing bolt 6 is embedded at the top of a wire bracket 7, a lightning current discharge device 9 is connected at the right side of the wire bracket 7, a magnetic coil 5 is arranged at the upper part of the lightning current discharge device 9, a switch handle 2 is arranged at the top of an inner cavity of the SPD backup protection device, a switch guide rod 3 is arranged at the outer side of a rotating shaft of the switch handle 2, the switch guide rod 3 is made of steel materials and is subjected to surface passivation treatment, the switch guide rod 3 is connected with a small power frequency current short circuit rapid breaking device 4, the lower end of the small power frequency current short circuit rapid breaking device 4 is connected with a tungsten-copper high-energy contact 12, an arc guide groove 13 is arranged at the bottom of the tungsten-copper high-energy contact 12, an arc extinguishing cover 10 is arranged below the arc guide groove 13, a flame-retardant clapboard 11 is arranged below the arc extinguishing cover 10, generated arc is guided to the arc extinguishing cover 10 by the arc guide groove 13, generated, the integral performance of the whole SPD backup protection device is ensured, and the damage of the whole system is avoided.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the principles of the present invention.

Claims

The SPD backup protection device is characterized by comprising a small power frequency current short circuit rapid breaking device (4), a lightning stroke impact current bleeder mechanism (9) and an arc-extinguishing cover (10), wherein the breaking device (4) comprises a set of tripping mechanism, an NTC thermistor is connected in series on a magnetic coil loop of the tripping mechanism, a T1 special gas discharge tube is arranged in the middle of an inner cavity of the lightning stroke impact current bleeder mechanism (9), and the arc-extinguishing cover (10) is arranged on one side of the lightning stroke impact current bleeder mechanism (9) and provided with a tungsten-copper high-energy contact (12) at the end part.
2. The SPD backup protection device according to claim 1, characterized in that a switch handle (2) is connected to the upper portion of the SPD backup protection device, a handle pull rod (1) is fixedly arranged at the end portion of the switch handle (2), a wire inlet through hole (14) and a vent hole (15) are formed in the end portion of the SPD backup protection device, edges of the wire inlet through hole (14) are chamfered, the vent hole (15) ensures that gas can be rapidly discharged from the hole after being expanded when lightning current flows through the vent hole, and the SPD backup protection device cannot be cracked due to gas expansion.
3. The SPD backup protection device according to claim 2, wherein the bottom of the SPD backup protection device is provided with four mounting chutes (8), the number of the SPD backup protection devices is four, the number of the SPD backup protection devices can be selected according to actual use conditions to be mounted and arranged in parallel, the mounting chutes (8) are all dovetail grooves, and the side surface of the SPD backup protection device is provided with an auxiliary contact mounting hole (16), so that the real-time monitoring of the working state of the backup protector can be realized.
4. The SPD backup protection device according to any one of claims 1-3, characterized in that a switch handle (2) is arranged at the top of an inner cavity of the SPD backup protection device, a switch guide rod (3) is arranged outside a rotating shaft of the switch handle (2), the switch guide rod (3) is made of steel and is subjected to surface passivation treatment, the switch guide rod (3) is connected with a small power frequency current short-circuit rapid breaking device (4), the lower end of the small power frequency current short-circuit rapid breaking device (4) is connected with a tungsten-copper high-energy contact (12), an arc guide groove (13) is arranged at the bottom of the tungsten-copper high-energy contact, an arc extinguishing cover (10) is arranged below the arc extinguishing cover (13), and a flame-retardant partition plate (11) is arranged below the arc extinguishing.