CN206135408U - With trigger composite lightning protector and lightning protection components - Google Patents

Abstract

The utility model provides a composite lightning protector with a trigger and a lightning protection component. The lightning protection component includes a closed spark gap, a temperature switch, a low-voltage discharge module, and a self-inductance booster; the temperature switch, the low-voltage discharge module, and the low-voltage winding of the self-inductance booster are connected in series and then grounded to form a low-voltage discharge path. The temperature switch is also connected to the input power supply terminal; the sealed spark gap is connected between the input power supply terminal and the ground to form a high-voltage discharge path in parallel with the low-voltage discharge path; wherein, the sealed spark gap is connected between the input power supply terminal and the ground A trigger head is also provided between the head and the output head, and one end of the high-voltage winding of the self-inductance booster is connected to the trigger head, and the other end is grounded. The composite lightning protection device with trigger type includes the lightning protection component and the mounting seat; the lightning protection component is pluggably installed in the mounting The above lightning protection components are grounded.

Description

With trigger composite lightning protector and lightning protection components

technical field

The utility model relates to the technical field of protection devices for electronic and electrical equipment, in particular to a composite lightning protector with a trigger and a lightning protection component.

Background technique

Multi-level protection is generally used for overvoltage protection of low-voltage power distribution systems. The main purpose of adopting multi-level protection is to meet the requirements of large flow capacity and residual pressure lower than the withstand voltage level of the equipment. In GB50057-94 (2000 Edition) "Code for Lightning Protection Design of Buildings", Article 6.4.11 stipulates that "under normal circumstances, when SPDs are installed in multiple places on the line and there is no accurate data, the voltage switch type SPD and the voltage limiting type The line length between SPDs should not be less than 10m, and the line length between voltage-limiting SPDs should not be less than 5m.". Article 9.2.2 of the industry standard YD/T5098-2005 "Communication Bureau (Station) Lightning Protection and Grounding Engineering Design Code" of the Ministry of Information Industry stipulates that "when using hierarchical protection, the surge protectors at all levels should maintain the necessary Decoupling distance or adding decoupling devices to ensure the coordination of surge protectors at all levels. The decoupling distance (cable length) between zinc oxide SPD and zinc oxide SPD should not be less than 5m.". In the actual installation process, it is often impossible to meet the installation distance requirements between the two stages due to the installation space problem. Therefore, on the basis of improving the lightning protection performance, reducing the space occupation of the lightning protector becomes an urgent problem to be solved.

Utility model content

Aiming at the defects in the prior art, the purpose of the utility model is to provide a composite lightning protector with a trigger and a lightning protection component.

A lightning protection component provided according to the utility model includes a sealed spark gap, a temperature switch, a low-voltage discharge module, and a self-inductance booster;

The temperature switch, the low-voltage discharge module, and the low-voltage winding of the self-inductance booster are sequentially connected in series and grounded to form a low-voltage discharge path, and the temperature switch is also connected to the input power terminal;

The airtight spark gap is connected between the input power terminal and the ground to form a high-voltage discharge path connected in parallel with the low-voltage discharge path;

Wherein, the sealed spark gap is further provided with a trigger head between the input head and the output head, and one end of the high-voltage winding of the self-inductance booster is connected to the trigger head, and the other end is grounded.

As an optimized solution, a working indicator light is also included; one end of the working indicator light is connected between the temperature switch and the low-voltage discharge module, and the other end is grounded.

As an optimized solution, the temperature switch is an overheating fuse.

As an optimized solution, the low-voltage discharge module includes a piezoresistor and a discharge tube connected in series, the piezoresistor is connected to the temperature switch, and the discharge tube is connected to the self-inductance booster.

As an optimized solution, the discharge tube is a ceramic discharge tube.

As an optimized solution, the varistor is a zinc oxide varistor.

As an optimized solution, the temperature switch is arranged on the surface of the piezoresistor for disconnecting the circuit when the piezoresistor is overheated.

Based on the same concept of the utility model, the utility model also provides a trigger-type composite lightning protector, including the lightning protection component and the mounting seat; the lightning protection component is pluggably installed on the In the mounting seat, the three-phase power line and the zero line are respectively grounded through one of the lightning protection components.

As an optimized solution, a bus bar is also included; the lightning protection components are all grounded through the bus bar.

Compared with the prior art, the utility model has the following beneficial effects:

When the residual voltage is lower than the threshold value of the closed spark gap, the utility model can also open the closed spark gap to discharge the current while using the discharge tube and the varistor to discharge, thereby improving the lightning protection ability for small currents; when the residual voltage is high In the case of the closed spark gap threshold, the closed spark gap is normally opened for large current leakage. The composite lightning protector with trigger has the lightning protection capability of Class I voltage switch SPD and Class II voltage limiting SPD. At the same time, the two classes are assembled in the same mounting base without considering the safety distance of Class I and Class II. It is smaller than the separate type of traditional lightning arrester.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is a kind of lightning protection assembly;

Figure 2 is a composite lightning protector with trigger;

Figure 3 is a traditional graded lightning arrester.

detailed description

The utility model is described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present utility model. These all belong to the protection domain of the present utility model.

The utility model discloses a lightning protection component as shown in Fig. 1, comprising a sealed spark gap, a temperature switch, a low-voltage discharge module, and a self-inductance booster;

The temperature switch, the low-voltage discharge module, and the low-voltage winding of the self-inductance booster are sequentially connected in series and grounded to form a low-voltage discharge path, and the temperature switch is also connected to the input power terminal;

The airtight spark gap is connected between the input power terminal and the ground to form a high-voltage discharge path connected in parallel with the low-voltage discharge path;

Wherein, the sealed spark gap is further provided with a trigger head between the input head and the output head, and one end of the high-voltage winding of the self-inductance booster is connected to the trigger head, and the other end is grounded. The utility model is connected with the trigger head of the airtight spark gap through the self-inductance booster, so as to realize the opening of the high-voltage discharge path triggered after the low voltage is raised.

The high-voltage discharge path mentioned in this patent is relative to the low-voltage discharge path. When the high-voltage discharge path is normally opened, the voltage on the input power supply is greater than the threshold voltage of the closed spark gap.

As shown in Figure 1, the airtight spark gap has three tungsten copper electrodes A, C, and D. The positions of the three electrodes determine that the breakdown voltage between AD must be higher than that between AC and CD. When any AC or CD When the breakdown sparks, the electrons in the closed cavity lead to a conduction state between AD.

When the small current is discharged through the low-voltage discharge path, the self-inductance booster amplifies the flowing voltage by 1.5-2 times and then adds it to the trigger head of the closed spark gap, that is, it is added between the CDs shown in Figure 1 . If the amplified voltage causes breakdown and flashover between CDs, the closed spark gap will be turned on. Therefore, the self-inductance booster plays the role of triggering the closed spark gap through the induced voltage in this scheme.

The self-inductance booster uses the principle of the sudden change time of the lightning current from small to large and the induced voltage change of the primary and secondary turns. The sudden change of current between BDs induces high voltage on the high-voltage winding of the self-inductance booster, making the airtight The CD-to-CD voltage of the spark gap is about 1.5-2 times higher than the voltage on the low-voltage winding of the self-inductance booster at this time, causing the conduction of the closed spark gap.

The lightning protection package also includes a working indicator light. One end of the working indicator light is connected between the temperature switch and the low-voltage discharge module, and the other end is grounded. The working indicator light can be a neon lamp.

The low-voltage discharge module includes a piezoresistor and a discharge tube connected in series, the piezoresistor is connected to the temperature switch, and the discharge tube is connected to the self-inductance booster.

The temperature switch is an overheating fuse. The temperature switch is arranged on the surface of the piezoresistor and is used to disconnect the circuit when the piezoresistor is overheated. The overheating fuse is attached to the piezoresistor, and when the piezoresistor is overheated, the overheating fuse is blown and the working indicator light goes out at the same time.

The discharge tube is a ceramic discharge tube. The ceramic discharge tube is in a conduction state when the voltage at both ends increases to a certain value.

The varistor is a zinc oxide varistor. Zinc oxide varistors are in a low-resistance state when the voltage across them rises to a certain value.

The principle of the utility model is that when the residual voltage is lower than the threshold value of the closed spark gap, the discharge tube and the piezoresistor can be used to discharge the current, and the closed spark gap can also be opened to discharge the current, thereby improving the lightning protection ability for small currents; When the residual voltage is higher than the threshold value of the closed spark gap, the closed spark gap is normally opened to discharge the large current.

The starting current from point A to point D in the closed spark gap (S-Gap) needs at least 3-5KA lightning current to use the short-circuit discharge current between AD. When a lightning strike occurs and the current is low, it is insufficient to start the closed spark gap to discharge the current to the ground. This part of the overcurrent is enough to damage the equipment. Therefore, the overcurrent in the early stage flows into point B through the temperature switch and breaks down the piezoresistor and the discharge tube so that the high voltage output end of the self-inductance booster is connected to the closed spark gap trigger head through a metal component, thus using more A small current can drive the closed spark gap to discharge, and at the same time it has the lightning protection capability of Class I voltage switch SPD and Class II voltage limiting SPD.

Based on the same utility model concept, the utility model also provides a trigger type composite lightning protector as shown in Figure 2, including the lightning protection component and the mounting seat; the lightning protection component can be inserted The ground is installed in the mounting base, and the three-phase power line and neutral line are respectively grounded through one of the lightning protection components.

The composite lightning protector with trigger also includes a bus bar; the lightning protection components are all grounded through the bus bar.

The trigger-type composite lightning protector is composed of a low-voltage discharge circuit, a high-voltage discharge circuit and a trigger connection circuit between the two, making full use of the advantages of different components to play their role. It is specially designed for low-voltage power supply system I and II surge protection as shown in Figure 3. The product is small in size, large in surge discharge capacity, low in voltage protection level, and fast in response. The installation of the decoupler between the traditional Class I and Class II surge protectors and the limitation on the length of the inter-stage connecting wires are canceled, especially suitable for the installation distance of 10m wires between the two stages of the Class I and Class II surge protectors. Use in case, save installation space, simplify installation technology, optimize wire connection.

The composite lightning protector with trigger is a perfect combination of lightning current arrester and surge protector. It only occupies 6 or 8 standard module width spaces, and can be used together with the surge protector of the Red Line product series without additional decoupling devices, and can also directly protect the equipment. The dual-terminal design of the trigger-type composite lightning protector simplifies the wiring work and does not require an additional module group for the load current. The bus bar added at the output end improves the possibility of combining other rail-mounted devices. The trigger-type composite lightning protector has a working indicator light and the modules are pluggable and easy to replace. The composite lightning protector with trigger type adopts varistor (voltage limiting type), gap discharge type (voltage switch type) and trigger circuit inside, and has the ability to limit the subsequent current, even if a predetermined short-circuit current occurs , the front fuse will not be disconnected.

The specific embodiments of the present utility model have been described above. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the utility model.

Claims (9)

1. A lightning protection assembly, characterized in that, comprises an airtight spark gap, a temperature switch, a low-voltage discharge module, and a self-inductance booster; The temperature switch, the low-voltage discharge module, and the low-voltage winding of the self-inductance booster are sequentially connected in series and grounded to form a low-voltage discharge path, and the temperature switch is also connected to the input power terminal; The airtight spark gap is connected between the input power terminal and the ground to form a high-voltage discharge path connected in parallel with the low-voltage discharge path; Wherein, the sealed spark gap is further provided with a trigger head between the input head and the output head, and one end of the high-voltage winding of the self-inductance booster is connected to the trigger head, and the other end is grounded. 2 . The lightning protection component according to claim 1 , further comprising a working indicator light; one end of the working indicator light is connected between the temperature switch and the low-voltage discharge module, and the other end is grounded. 3. A lightning protection component according to claim 1, wherein the low-voltage discharge module includes a piezoresistor and a discharge tube connected in series, the piezoresistor is connected to the temperature switch, and the discharge tube Connect the self-inductive booster. 4. The lightning protection component according to claim 3, wherein the discharge tube is a ceramic discharge tube. 5. A lightning protection component according to claim 4, characterized in that the varistor is a zinc oxide varistor. 6 . The lightning protection component according to claim 4 , wherein the temperature switch is arranged on the surface of the varistor, and is used to disconnect the circuit when the varistor is overheated. 7 . 7. The lightning protection component according to claim 1, wherein the temperature switch is an overheating fuse. 8. A composite lightning protector with a trigger, characterized in that it comprises the lightning protection component and the mounting seat described in any one of claims 1-6; the lightning protection component is pluggably installed on the In the mounting seat, the three-phase power line and the zero line are respectively grounded through one of the lightning protection components. 9. A trigger-type composite lightning protector according to claim 8, further comprising a bus bar; The lightning protection components are all grounded through the bus bar.