CN216312675U - Lightning protection device with low residual voltage, lightning protection box - Google Patents
Lightning protection device with low residual voltage, lightning protection box Download PDFInfo
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- CN216312675U CN216312675U CN202122373457.5U CN202122373457U CN216312675U CN 216312675 U CN216312675 U CN 216312675U CN 202122373457 U CN202122373457 U CN 202122373457U CN 216312675 U CN216312675 U CN 216312675U
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Abstract
The utility model belongs to the technical field of lightning protection, and provides a lightning protection device with low residual voltage, a lightning protection box and a lightning protection device, wherein the lightning protection device comprises: a low residual voltage freewheel-free circuit including a voltage limiting element and a switching type element connected in series; a remote signaling circuit electrically connected to the low residual voltage no-follow current circuit, for receiving status information of whether the voltage limitation and/or the switching type element is good; the failure indicating circuit is electrically connected with the remote signaling circuit and comprises a switch electrically connected with the remote signaling circuit and an indicating circuit connected with the switch; when the low residual voltage non-freewheeling circuit works normally, the remote signaling circuit outputs a disconnection state, the switch responds to the disconnection state and disconnects the failure indication circuit, and the failure indication circuit does not generate current. Therefore, the lightning protection device is provided with the combination of the low residual voltage non-follow current circuit, the remote signaling circuit and the failure indication circuit, so that the low residual voltage non-follow current failure indication function is realized.
Description
Technical Field
The utility model relates to the technical field of lightning protection, in particular to a lightning protection device and a lightning protection box with low residual voltage.
Background
The lightning protection module is a lightning protection device and is mainly installed at a power supply inlet wire of equipment which is easy to be struck by lightning for a power distribution room, a power distribution cabinet, an alternating current distribution panel, a switch box and other important equipment so as to protect the equipment from being damaged by lightning overvoltage invading along a power supply circuit.
The lightning protection module is composed of a voltage switch type module and a voltage limiting type module (or an integrated MOV). The lightning protection device is mainly installed at the power inlet wire of a power distribution room, a power distribution cabinet, an alternating current distribution panel, a switch box and other important equipment and equipment easy to be struck by lightning so as to protect the equipment from being damaged by lightning overvoltage invading along a power line; the method can be widely applied to the main power protection of systems such as communication, electric power, traffic, finance, railways, civil aviation, photovoltaic and the like.
For example, chinese patent application No. CN201721779018.1 is a technical solution disclosed by chinese patent: in order to solve the problem that the prior art lacks a technical scheme capable of accurately prompting the specific use states of the multiple parallel protection elements, the state indicating device for the lightning protection module and the lightning protection module are provided, and different state information can be prompted based on different states of the multiple parallel protection elements.
However, the lightning protection device in the prior art is usually only provided with an MOV, and in the existing lightning protection box indicating circuit, there is basically a static power consumption, and in the normal state, there is a current flowing through the lightning protection box.
SUMMERY OF THE UTILITY MODEL
The utility model provides a lightning protection device and a lightning protection box with low residual voltage, which realize the function of indicating the failure of a low residual voltage and no follow current band by providing a combination of a low residual voltage no-follow current circuit, a remote signaling circuit and a failure indicating circuit in the lightning protection device.
In one aspect, the present invention provides a lightning protection device with low residual voltage, comprising:
a low residual voltage freewheel-free circuit including a voltage limiting element and a switching type element connected in series; after a voltage limiting element and a switch-type element in the series-combined low-residual-voltage non-freewheeling circuit are switched on, the voltage at two ends of the voltage limiting element changes along with the change of surge current, and the voltage of the switch-type element is kept at a preset value;
a remote signaling circuit electrically connected to the low residual voltage no-follow current circuit, receiving status information of whether the voltage limiting and/or switching type element is good;
the failure indicating circuit is electrically connected with the remote signaling circuit and comprises a switch electrically connected with the remote signaling circuit and an indicating circuit connected with the switch;
when the low residual voltage non-freewheeling circuit works normally, the remote signaling circuit outputs a disconnection state, the switch responds to the disconnection state and disconnects the failure indication circuit, and the failure indication circuit does not generate current; when the low residual voltage non-follow current circuit fails, the remote signaling circuit is in a closed state, the switch responds to the closed state to close the indicating circuit, and the indicating circuit outputs prompt information.
In a preferred embodiment of the present invention, the low residual voltage freewheel-free circuit includes a plurality of sets of series-connected voltage limiting elements and switching-type elements, each set of series-connected voltage limiting elements and switching-type element circuits being connected in parallel with each other.
In a preferred embodiment of the present invention, the lightning protection device further includes an impedance element connected in parallel with the low residual voltage freewheel-free circuit.
In a preferred embodiment of the present invention, the voltage switching element is a gas discharge tube having a dc breakdown voltage Udc between 330V and 380V, and a discharge capacity for lightning current In =10kA and Imax =20 kA; the voltage-limiting element has a voltage-sensitive voltage equal to 470V and a diameter of 32 mm.
In another aspect, the present invention further provides a lightning protection box with low residual voltage, including:
a shell body, a plurality of first connecting rods and a plurality of second connecting rods,
one or more lightning protection devices located within the housing, the lightning protection device being any one of the lightning protection devices of the first aspect described above having a low residual voltage.
In a preferred embodiment of the utility model, the lightning protection box is applied to a photovoltaic power system.
Because the low residual voltage non-follow current circuit provided in the lightning protection device is provided with the voltage limiting element and the switch type element which are connected in series, when the instantaneous value of alternating voltage at two ends is lower than the voltage limiting element, the current flowing into the low residual voltage non-follow current circuit is smaller than the maintaining current of the switch type element, thereby quickly cutting off and cutting off the leakage current of the voltage limiting element, and ensuring that the voltage limiting element does not bear voltage stress when in normal work, thereby delaying the aging of the voltage limiting element and reducing the limiting voltage when the voltage limiting element is used independently; and the lightning protection device is also provided with a remote signaling circuit and a failure indicating circuit, when the low residual voltage non-follow current circuit works normally, the failure indicating circuit does not generate current, and the non-follow current failure indicating function can be realized.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a schematic structural diagram of a lightning protection box with low residual voltage according to an embodiment of the present invention.
Fig. 2 is an exploded schematic view of a lightning protection box with low residual voltage according to an embodiment of the present invention.
Fig. 3 is a block diagram of a lightning protection device with low residual voltage according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a low residual voltage no-freewheeling circuit in a lightning protection device with low residual voltage according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of the voltage variation corresponding to fig. 4.
Fig. 6 is a circuit diagram of a remote signaling circuit and a failure indication circuit in a lightning protection device with low residual voltage according to an embodiment of the present invention.
Fig. 7 is a circuit diagram of a low residual voltage freewheeling circuit in a lightning protection device with low residual voltage according to another embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that the detailed description is only for the purpose of making the utility model easier and clearer for those skilled in the art, and is not intended to be a limiting explanation of the utility model; moreover, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.
In addition, the terminology used in the embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The technical scheme of the utility model is described in detail by the figures and the specific embodiments as follows:
example one
Fig. 1 is a schematic structural diagram of a lightning protection box with low residual voltage according to this embodiment, and fig. 2 is an exploded schematic diagram of a lightning protection box with low residual voltage according to this embodiment. As shown in fig. 1 and 2, the present embodiment provides a lightning protection box 100 with low residual voltage, where the lightning protection box 100 includes:
the bottom of the shell is provided with two mounting holes, and the side wall of the shell is provided with a wire hole;
one or more lightning protection devices 140 positioned within the housing, the lightning protection devices being lightning protection devices having a low residual voltage; the lightning protection device with low residual voltage is installed inside the case frame 160 by the screw 150; the specific circuit inside the low residual voltage lightning protection device casing is shown in fig. 2 and 3.
The upper cover 120 of the lightning protection box is connected to the housing frame 160 by screws 110, the lightning protection device 140 is located inside the housing, and the isolation member 130 is disposed between the lightning protection box 140 and the upper cover 12.
As a preferred embodiment, the lightning protection box 100 is applied to a photovoltaic power system.
As shown in fig. 3, 4 and 6, the lightning protection device 200 with low residual voltage provided in this embodiment includes:
a low residual voltage freewheel-free circuit 210 including a voltage limiting element and a switching type element connected in series; after the voltage limiting element and the switching element in the series combination low residual voltage freewheel circuit are turned on, the voltage across the voltage limiting element changes (slightly changes) with the change of the surge current, and the voltage of the switching element is kept at a predetermined value.
In a preferred embodiment of this embodiment, the voltage limiting element includes a voltage-sensitive element (MOV), and the switch element is an air switch (GDT). For example, the voltage limiting element is a gas discharge tube with a direct-current breakdown voltage Udc between 330V and 380V, and the discharge capability for lightning current In =10kA and Imax =20 kA; the voltage limiting element has a voltage drop equal to 470V and a diameter of 32 mm.
As shown in fig. 5, the series relationship of the MOV and GDT or air gap is as shown in fig. 4, since both elements pass the same current, their rated discharge capacity should be the same. The working process of the series combination when a surge invades comprises:
at the initial time t0 of surge intrusion, the voltage across the series combination is divided by the capacitance of the two elements, since the capacitance of the MOV is hundreds to thousands PF and the GDT is only 1-2PF, the voltage is almost entirely applied to the GDT, and the GDT breaks down and conducts at the time 1 t; in practical applications, a capacitor may be connected in parallel to the MOV if the capacitance of the MOV itself is not large enough.
After breakdown of the GDT is turned on, the voltage across it drops to the arc discharge voltage Ua and the voltage across the MOV rises abruptly to a value of 1zU corresponding to the current at that moment. The voltage across the series combination =1zU + Ua.
After the series combination is turned on, the voltage across the MOV varies little with the surge current, while the voltage across the GDT remains substantially Ua. This condition is maintained until the series combination turns off (time t 3) when the inrush current decreases to a holding current that is less than the GDT.
As shown in fig. 5 and described above, from the above analysis, it can be seen that the voltage across the series combination is initially substantially equal to the breakdown voltage of the GDT or air gap, and thereafter substantially dependent on the clamping voltage of the MOV. The purpose of using this series combination is:
1. and cutting off the follow current after the GDT or the air gap breakdown is conducted. In this series combination, when the instantaneous value of the ac voltage across the combination is lower than the voltage-dependent voltage of the MOV, the current flowing into the combination is less than the holding current of the GDT and is therefore cut off quickly.
2. The leakage current of the MOV is cut off, so that the MOV does not bear voltage stress during normal operation, the aging of the MOV is delayed, the service life of the MOV is prolonged, and the influence of the capacitance of the MOV on the system operation is greatly reduced.
3. The limiting voltage is reduced when MOVs alone are used. For example, an SPD designed for 50Hz/220V single phase power supply with nominal discharge current In =10 kA:
if only MOVs are used, MOV elements with a diameter of 32mm and a voltage-dependent voltage of 620V are selected, which have a voltage limiting ratio of substantially 2.3 at In =10kA and a limiting voltage =2.3x620V = 1426V.
If a series combination of GDT and MOV is used, a dc breakdown voltage Udc = 330V-380V, a GDT with a discharge capacity of 8/20 lightning current In =10kA, Imax =20kA, and a voltage dependent voltage =470V, MOV with a diameter of 32mm may be selected. According to the regulation of GB18802.1, the limiting voltage of this series combination is the large of the two following values:
1. the breakdown voltage of the GDT, which is less than 900V;
2. the sum of the MOV limiting voltage and the GDT arc discharge voltage at In =10kA, i.e. 2.3x 470 + 50 = 1131V, so the combined limiting voltage is 1131V, 295V lower than 1426V with MOV alone.
As shown in fig. 4 and 7, the lightning protection device 200 with low residual voltage further includes:
a remote signaling circuit 230 electrically connected to the low residual voltage freewheel circuit 210, receiving status information on whether the voltage limitation and/or the switching type element is good;
a failure indication circuit 220 electrically connected with the telecommand circuit 230, comprising switches K1, K2, K3, K4, K5, K6 electrically connected with the telecommand circuit, an indication circuit (such as a LED lamp) connected with the switches; the remote signaling circuit is correspondingly provided with a remote signaling contact, and the remote signaling circuit 230 is connected with the low residual voltage non-freewheeling circuit 210 in a wireless remote sensing or wired induction mode; and can input an open or closed signal to the switches K1, K2, K3, K4, K5, K6.
When the low residual voltage non-freewheeling circuit 210 normally works, the remote signaling circuit 230 outputs a disconnected state, the switch responds to the disconnected state and disconnects the failure indicating circuit 220, and the failure indicating circuit 220 does not generate current; when the low residual voltage non-freewheeling circuit 210 fails, the remote signaling circuit 220 is in a closed state, the switch responds to the closed state, the indicating circuit is closed, and the indicating circuit outputs prompt information; such as an LED light.
Because the low residual voltage non-follow current circuit provided in the lightning protection device is provided with the voltage limiting element and the switch type element which are connected in series, when the instantaneous value of alternating voltage at two ends is lower than the voltage limiting element, the current flowing into the low residual voltage non-follow current circuit is smaller than the maintaining current of the switch type element, thereby quickly cutting off and cutting off the leakage current of the voltage limiting element, and ensuring that the voltage limiting element does not bear voltage stress when in normal work, thereby delaying the aging of the voltage limiting element and reducing the limiting voltage when the voltage limiting element is used independently; and the lightning protection device is also provided with a remote signaling circuit and a failure indicating circuit, when the low residual voltage non-follow current circuit works normally, the failure indicating circuit does not generate current, and the non-follow current failure indicating function can be realized.
Example two
In this embodiment, on the basis of the first embodiment, the low residual voltage freewheeling-free circuit is further optimized, for example: the low residual voltage freewheel-free circuit includes a plurality of sets of series-connected voltage limiting elements and switch-type elements, each set of series-connected voltage limiting elements and switch-type element circuits being connected in parallel with each other.
Specifically, as shown In fig. 6, the series combination of GDT and MOV can be connected In parallel, and the MOV is selected so that when any series combination is breakdown conductive, the voltage across the combination can force the other series combinations to breakdown conductive under the condition that the discharge current is smaller than that of the series combination In, so that the current In each series combination is not overloaded.
EXAMPLE III
In this embodiment, on the basis of the first embodiment, the low residual voltage freewheeling-free circuit is further optimized, for example: the lightning protection device further comprises an impedance element connected in parallel with the low residual voltage freewheel-free circuit.
Specifically, instead of an MOV, other impedances, such as linear resistors, inductors, or combinations thereof, may be used to increase the discharge current capability by connecting a GDT in series with an MOV and connecting such series combinations in parallel.
Finally, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make many changes and simple substitutions to the technical solution of the present invention without departing from the technical solution of the present invention, and the technical solution of the present invention is protected by the following claims.
Claims (6)
1. A lightning protection device having a low residual voltage, comprising:
a low residual voltage freewheel-free circuit including a voltage limiting element and a switching type element connected in series; after a voltage limiting element and a switch-type element in the series combination low residual voltage non-freewheeling circuit are switched on, the voltage at two ends of the voltage limiting element changes along with the change of surge current, and the voltage of the switch-type element is kept at a preset value;
a remote signaling circuit electrically connected to the low residual voltage no-follow current circuit, receiving status information of whether the voltage limiting and/or switching type element is good;
the failure indicating circuit is electrically connected with the remote signaling circuit and comprises a switch electrically connected with the remote signaling circuit and an indicating circuit connected with the switch;
when the low residual voltage non-freewheeling circuit works normally, the remote signaling circuit outputs a disconnection state, the switch responds to the disconnection state and disconnects the failure indication circuit, and the failure indication circuit does not generate current; when the low residual voltage non-follow current circuit fails, the remote signaling circuit is in a closed state, the switch responds to the closed state to close the indicating circuit, and the indicating circuit outputs prompt information.
2. The lightning protection device according to claim 1, wherein the low residual voltage freewheel-free circuit comprises a plurality of sets of series-connected voltage limiting elements and switch-type elements, each set of series-connected voltage limiting elements and switch-type element circuits being connected in parallel with each other.
3. The lightning protection device of claim 1, further comprising an impedance element in parallel with the low residual voltage freewheel-free circuit.
4. The lightning protection device according to claim 1, wherein the voltage switching element is a gas discharge tube with a direct current breakdown voltage Udc between 330V and 380V, a discharge capacity for lightning current In =10kA and Imax =20 kA; the voltage limiting element has a voltage-sensitive voltage equal to 470V and a diameter of 32 mm.
5. The utility model provides a lightning protection box with low residual voltage which characterized in that includes:
a shell body, a plurality of first connecting rods and a plurality of second connecting rods,
one or more lightning protection devices within the housing, the lightning protection device being a lightning protection device with a low residual voltage as claimed in any one of claims 1 to 4.
6. The lightning protection box according to claim 5, wherein the lightning protection box is applied to a photovoltaic power system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122373457.5U CN216312675U (en) | 2021-09-29 | 2021-09-29 | Lightning protection device with low residual voltage, lightning protection box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122373457.5U CN216312675U (en) | 2021-09-29 | 2021-09-29 | Lightning protection device with low residual voltage, lightning protection box |
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| Publication Number | Publication Date |
|---|---|
| CN216312675U true CN216312675U (en) | 2022-04-15 |
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| CN202122373457.5U Active CN216312675U (en) | 2021-09-29 | 2021-09-29 | Lightning protection device with low residual voltage, lightning protection box |
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2021
- 2021-09-29 CN CN202122373457.5U patent/CN216312675U/en active Active
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