CN213070882U - Lightning protection transformer - Google Patents

Abstract

The utility model discloses a lightning protection transformer, lightning protection transformer primary coil or secondary coil independently set up coil shield, primary coil shield shields and isolates secondary coil and iron core in the direction of approach with secondary coil and iron core, secondary coil shield shields and isolates primary coil and iron core in the direction of approach with primary coil and iron core, coil shield comprises conducting material, set up the ground terminal on the coil shield, use the wire to ground the coil shield or receive floor equipotential contact when installing the lightning protection transformer, when external transmission equipment is struck by lightning, the coil shield of lightning protection transformer guides the thunder and lightning that gets into from the transmission line to the ground, prevent the thunder and lightning current from getting into the back level equipment end, ensuring that the rear-stage protected electronic equipment is not damaged by lightning strikes.

Description

Lightning protection transformer

Technical Field

The utility model relates to a transformer field, in particular to lightning protection transformer.

Background

The electronic device belongs to a weak current device relative to the power device. Electronic equipment is usually installed indoors, the possibility of direct lightning strike is basically not available, and when outdoor power equipment is struck by lightning, the lightning forms a path on a device of the electronic equipment through the conduction of a power supply circuit, so that the electronic equipment is damaged due to overhigh lightning voltage and overlarge lightning current.

The existing solution is mainly a current leakage method, wherein a current leakage component is installed on a power line, and before lightning reaches electronic equipment, lightning current is discharged to the ground, however, the current leakage component has the problems of high reliability and low reliability because of the electrical impedance of a current leakage line, the current leakage component has an imperfect current leakage effect, a lightning current leakage device is installed, and the electronic equipment is often damaged by lightning.

SUMMERY OF THE UTILITY MODEL

In view of the not enough of prior art, the utility model aims to provide a lightning protection transformer, when power equipment is struck by lightning, shield the isolation to the thunder and lightning that transmits from power supply line, prevent the thunder and lightning to pass the transformer and get into the back level, ensure to install the electronic equipment at the back of lightning protection transformer and not damaged by the thunderbolt. In order to achieve the purpose, the utility model discloses adopted following technique:

a lightning protection transformer is composed of a primary coil, a secondary coil, an iron core and a coil shield, wherein the coil shield is made of conductive materials, the primary coil or the secondary coil is independently provided with the coil shield, the primary coil shield shields and isolates the secondary coil and the iron core in the approaching direction of the secondary coil and the iron core, and the secondary coil shield shields and isolates the primary coil and the iron core in the approaching direction of the primary coil and the iron core. When the lightning protection transformer is installed, the coil shielding cover is grounded or connected to a floor equipotential contact by a lead, and the coil shielding cover is directly connected to a grounding point by the lead without being influenced by the performance of a lightning leakage element device. When the external power transmission equipment is struck by lightning, the lightning entering from the power transmission line can break through the insulating layer of the primary coil and reach the coil shielding cover, at the moment, the coil shielding cover can guide the lightning to the ground, the lightning current is prevented from passing through the transformer and entering the end of the secondary equipment, the fact that the secondary protected electronic equipment is not damaged by the lightning is guaranteed, at the moment, if the shielding isolation of the coil shielding cover is not achieved, the lightning can break through the insulating layer of the secondary coil and enter the rear stage of the transformer, and the electronic equipment behind the transformer is damaged.

The lightning protection transformer has the same manufacturing method as the common transformer, and is different from the prior transformer in that the primary coil or the secondary coil is respectively and independently provided with the coil shielding cover which is different from the electromagnetic shielding device of the prior transformer, the electromagnetic shielding device of the prior transformer wraps the whole transformer or coil outside to separate the whole transformer or coil from the outside and avoid the outward electromagnetic radiation of the transformer, the utility model relates to a coil shielding cover of the lightning protection transformer, which shields and isolates the secondary coil and the iron core in the approaching direction with the secondary coil and the iron core, the primary coil is singly wrapped from the inside and is separated from the primary coil and the iron core in the approaching direction with the primary coil and the iron core, lightning entering from an external power line is prevented from reaching the secondary coil of the transformer and damaging the subsequent equipment. The primary coil and the secondary coil of a transformer can be simultaneously and respectively provided with respective coil shielding covers, or only the primary coil can be shielded, or only the secondary coil can be shielded, and only one primary shielding cover plays the same lightning protection role.

Drawings

Fig. 1 is a schematic diagram of a lightning protection transformer.

Fig. 2 is a schematic diagram of a coil shield structure.

Fig. 3 is a schematic structural diagram of a lightning protection transformer.

Fig. 4 is a schematic diagram of an application of the lightning protection transformer.

Detailed Description

The utility model discloses a lightning protection transformer through independently setting up current shielding isolating device to transformer primary or secondary, prevents the thunder and lightning to get into transformer back level, realizes the purpose to back level electronic equipment lightning protection. In order to make the purpose, technical solution and effect of the present invention clearer, the following is further described in detail with reference to the accompanying drawings.

As shown in fig. 1, the lightning protection transformer of the present invention comprises a primary coil 1, a primary coil shield 2, an iron core 3, a secondary coil 4, and a secondary coil shield 5, wherein a grounding terminal 6 is provided on the primary coil shield 2 and the secondary coil shield 5, the primary coil shield 2 shields and isolates the secondary coil 4 and the iron core 3 in the approaching direction to the secondary coil 4 and the iron core 3, the secondary coil shield 5 shields and isolates the primary coil 1 and the iron core 3 in the approaching direction to the primary coil 1 and the iron core 3, the primary coil shield 2 and the secondary coil shield 5 are grounded or connected to a floor equipotential contact by a wire when the lightning protection transformer is installed, when an external power device is struck by lightning, the lightning coming from a power transmission line may break through an insulating layer of the primary coil 1 and reach the primary coil shield 2 or the secondary coil shield 5, at this time, the primary coil shield 2 and the secondary coil shield 5 can guide the lightning to the ground, preventing the lightning current from entering the rear stage to damage the electronic equipment. The primary coil shield 2 or the secondary coil shield 5 can guide the lightning to the ground as long as one exists, and in the actual production, the secondary coil shield 5 is recommended to be reserved, because when the primary coil 1 is broken through an insulating layer by the lightning, high-temperature electric arcs can be generated, the secondary coil shield 5 is not burnt well due to the fact that the distance between the secondary coil shield 5 and the insulating layer is far away, and the shielding effect is prevented from being lost due to electric arc burning. Ain, Bin and Cin are input lines of ABC phase live wires respectively, Nin is an input line of a zero line, Aout, Bout and Cout are output lines of ABC phase live wires respectively, Nout is an output line of the zero line, and the single-phase lightning protection transformer is only provided with one live wire and one zero line.

As shown in fig. 2, the coil shield is composed of an inner cylinder 2, an outer cylinder 3, an upper cover 1, a lower cover 6, and a ground terminal 5, the upper end and the lower end of the inner cylinder 2 are left empty, when the transformer is manufactured, an iron core passes through the center of the inner cylinder 2, a transformer coil is wound between the inner cylinder 2 and the outer cylinder 3, the upper end of the outer cylinder 3 is covered by the upper cover 1, the lower end is covered by the lower cover 6, the inner cylinder 2, the upper cover 1, the lower cover 6 play a role of shielding and isolating the transformer iron core, and the outer cylinder 3 plays a role of shielding and isolating another primary or secondary coil. The coil outgoing line hole 4 is reserved in the outer barrel 3, the outgoing line hole 4 is larger than the outgoing line diameter and twice of the thickness of a metal sheet of the coil shielding cover, and meanwhile, the distance between the edge of the outgoing line hole 4 and an iron core is also guaranteed to be larger than the coil thickness in order to avoid the possibility that thunder and lightning is transmitted to the coil outgoing line from the coil shielding cover. The inner cylinder 2, the outer cylinder 3, the upper cover 1 and the lower cover 6 do not need to be in the form of a sealed box, but the respective objects must be in reliable electrical contact with each other and also in reliable electrical contact with the ground terminal 5. The upper cover 1 and the lower cover 6 are unnecessary, when the distances between the two ends of the coil wound in the inner cylinder 2 and the outer cylinder 3 and the distances between the two ends of the inner cylinder 2 and the outer cylinder 3 are larger than the coil thickness, the upper cover 1 and the lower cover 6 can be omitted, at the moment, the two ends of the inner cylinder 2 and the outer cylinder 3 are both wide, the distance is larger than the coil thickness, and the safety shielding and isolating functions of the coil shielding case to thunder and lightning can be guaranteed not to be reduced. The inner cylinder 2 and the outer cylinder 3 can be formed by bending metal sheets with good electric conduction, the shapes are determined according to the shapes of the formed transformation, the overlapping positions of the head and the tail of the metal sheets need to be subjected to insulation treatment to ensure that short circuit coils cannot be formed, the upper cover 1 and the lower cover 6 can also be formed by punching and shearing the metal sheets with good electric conduction, and the overlapping positions of the head and the tail of the metal sheets also need to be subjected to insulation treatment to ensure that the short circuit coils cannot be formed. The thickness of the metal sheet can meet the requirement of the mechanical processing strength capable of bending and forming, generally, a metal sheet with the thickness of 0.1mm to 2mm is selected, and the metal sheet can be replaced by dense metal mesh cloth according to the requirement of a manufacturing process. In actual production, the use of iron or aluminum sheets has already played a role of safety lightning protection, but the use of copper sheets is more desirable from the aspect of durability.

As shown in fig. 3, the lightning protection transformer is composed of a primary coil 1, an iron core 2, a secondary coil 8 and a coil shield 7, wherein the coil shield 7 is composed of an outer cylinder 4, an inner cylinder 5, an upper cover 3, a lower cover 6 and a grounding terminal 9, the transformer coil is wound between the outer cylinder 4 and the inner cylinder 5 of the coil shield 7, the outer cylinder 4 of the coil shield 7 plays a role of shielding and isolating another stage of coil, and the inner cylinder 5, the upper cover 3 and the lower cover 6 of the coil shield 7 play a role of shielding and isolating the transformer iron core 2. When the lightning protection transformer is installed, the coil shielding cover 7 is grounded or connected to a floor equipotential contact by a lead. When the outside power supply equipment is struck by lightning, the lightning entering from the power transmission line can possibly break through the insulating layer of the primary coil 1, at the moment, the coil shielding cover 7 can guide the lightning to the ground, the lightning is prevented from breaking through the insulating layer of the secondary coil 8 to enter the end of the rear-stage equipment, and the rear-stage protected electronic equipment is ensured not to be damaged by the lightning stroke.

Fig. 4 shows an application of a lightning protection transformer 6.

Firstly, according to the power requirement of the protected electronic equipment 7, selecting a proper lightning protection transformer 6, wherein the power of the lightning protection transformer 6 can be considered to be provided for the specific protected electronic equipment 7 only, and the power of the whole building or the whole floor is not considered to be provided, so that the power of the lightning protection transformer 6 is reduced, the manufacturing cost is reduced, the lightning protection transformer 6 with higher power occupies a larger installation place, and if the sharing points of output power are more, lightning can not be avoided from the sharing points of other power supplies, so that the safety of the protected electronic equipment 7 is difficult to ensure.

The second step, although safe lightning protection also can be accomplished to lightning protection transformer 6 independent utility, ensure that the back level is not damaged by the thunderbolt by protection electronic equipment 7, however, lightning protection transformer 6's primary coil is probably damaged by the thunder and lightning, in order to reduce the possibility that lightning protection transformer 6 damaged, generally cooperate thunder and lightning discharge device 2, 3, 4, 5 to use, install thunder and lightning discharge device 2 on the power supply input line, 3, 4, 5, can play the guard action to lightning protection transformer 6, thunder and lightning discharge device can use the surge protector device on the market.

And thirdly, when the lightning protection transformer 6 is installed, power supply power input lines Ain, Bin, Cin and Nin are firstly connected into the overcurrent protection switch 1 and then connected to the lightning protection transformer 6, each power input line is respectively connected with the lightning discharge devices 2, 3, 4 and 5, a coil shield in the lightning protection transformer 6, grounding ends of the lightning discharge devices 2, 3, 4 and 5 and a grounding wire of the protected electronic equipment 7 are uniformly connected to the ground electrode or the equipotential end PE. It is also noted that the power input wires cannot be routed with the output wires during installation.

And fourthly, the external data line 12 is accessed to the protected electronic equipment 7, if the external data line is not accessed by the optical fiber, the external data line must be accessed to the independent data switch 10 firstly, then the external data line is isolated by the optical fiber 8 and then accessed to the protected electronic equipment 7, the data switch 10 cannot use the power supply provided by the lightning protection transformer 6, and the external data line 12 is accessed by the optical fiber and can be directly connected to the protected electronic equipment 7.

Fifthly, the internal data of the protected electronic equipment 7 must be isolated by the optical fiber 9, then is connected to the data exchanger 11, and then is transmitted to the external equipment through the external equipment data line 13, and the exchanger 11 cannot use the power supply provided by the lightning protection transformer 6.

When lightning comes from the power input lines Ain, Bin, Cin, Nin, the lightning current is firstly discharged to the earth pole or the equipotential end PE by the lightning discharging devices 2, 3, 4, 5, if the insulating layer of the primary coil of the lightning protection transformer 6 is still broken down by the lightning, the coil shielding cover of the lightning protection transformer 6 guides the lightning to the earth, the lightning current is prevented from flowing to the protected electronic equipment 7, and the protected electronic equipment 7 is ensured not to be damaged.

When a lightning strike causes the earth pole or the equipotential end PE to form a large potential difference with the external power input lines Ain, Bin, Cin, Nin, at this time, the potential of the coil shield in the lightning protection transformer 6 is the same as the potential of the protected electronic device 7, and the current path does not pass through the protected electronic device 7, thereby ensuring that the protected electronic device 7 is not damaged.

When lightning comes from the external data line 12, the lightning is isolated by the optical fiber 8 and cannot reach the protected electronic equipment 7, and the protected electronic equipment 7 is ensured not to be damaged.

When lightning comes from the external device data line 13, the lightning is isolated by the optical fiber 9 and cannot reach the protected electronic device 7, so that the protected electronic device 7 is protected from being damaged.

It is necessary to install the over-current protection switch 1 on the power input line Ain, Bin, Cin, Nin, because when encountering lightning strike, when the thunder and lightning relief device 2, 3, 4, 5 releases the thunder and lightning to the earth pole or equipotential end PE, not every time the relief is finished, the pressure-sensitive bleeder components in the thunder and lightning relief device 2, 3, 4, 5 can both be recovered, if the pressure-sensitive bleeder components can not be recovered, it is equivalent to the short circuit of the line, at this moment, the over-current protection switch 1 jumps out, play the safety protection role, or stronger thunder and lightning may puncture the insulating layer of the primary coil of the lightning protection transformer 6, then the coil shielding cover releases to the ground, the power supply line is short-circuited because the insulating layer of the primary coil is punctured, at this moment, the over-current protection switch 1 plays the safety protection.

In the whole lightning protection application system, after lightning strike, the overcurrent protection switch 1 and the lightning discharge devices 2, 3, 4 and 5 are required to be checked and replaced in time, and if the lightning protection transformer 6 is damaged by the lightning strike, the insulating layer of the primary coil is broken down, and the detection and the replacement are required.

Claims (1)

1. A lightning protection transformer, its characterized in that: including primary, secondary, iron core, coil shield constitute by conducting material, primary or secondary independently set up the coil shield, primary shields the direction of approach with secondary and iron core and keeps apart secondary and iron core, secondary shields the direction of approach with primary and iron core and keeps apart primary and iron core.

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