CN215066817U - Experimental device of ground potential counterattack suppression device - Google Patents
Experimental device of ground potential counterattack suppression device Download PDFInfo
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- CN215066817U CN215066817U CN202120923066.3U CN202120923066U CN215066817U CN 215066817 U CN215066817 U CN 215066817U CN 202120923066 U CN202120923066 U CN 202120923066U CN 215066817 U CN215066817 U CN 215066817U
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- ground potential
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Abstract
The utility model discloses an experimental device of a ground potential counterattack suppression device, which relates to the technical field of lightning protection and comprises a ground potential counterattack suppression device and power supply supporting rods, wherein a feeder line is connected between the two power supply supporting rods and an alternating current screen, a grid RTU box is arranged on the two power supply supporting rods, a ground wire of the power supply supporting rods causes the ground potential of the power supply supporting rods to be raised through flashover or short circuit of a contact network, the potential difference between the ground potential counterattack suppression device and a reference ground, the potential difference between a live wire and the reference ground in the grid RTU box, the potential difference between the live wire and the reference ground in the ground potential counterattack suppression device, the current of a transmission rod of an operating mechanism box and the current on the grounding of an SPD in the ground potential counterattack suppression device are recorded, and the simulation of the contact network causes the counterattack of the power frequency ground potential or the simulation of lightning to strike the tower to cause the impact ground potential counterattack, therefore, whether the ground potential counterattack suppression device can reliably protect the grid RTU box and the electric control box is verified.
Description
Technical Field
The utility model relates to a lightning protection technical field especially relates to an experimental apparatus of earth potential counterattack suppression device.
Background
When an external lightning protection system (such as a lightning rod, a lightning protection net, etc.) of a building is directly struck by lightning, dangerous overvoltage is generated at two ends of a ground resistor, and the overvoltage is introduced into the equipment through a ground wire of the equipment, the external lightning protection system of the building or other nearby buildings or other natural lightning receptors (various pipelines, cable shielding pipes, etc.), so that the damage of the equipment is caused. When a building is directly struck by lightning, lightning current enters the ground along each down conductor and the grounding body in a lightning protection system of the building, transient high voltage is generated in the lightning protection system by the lightning current in the process, and if the insulation distance between the down conductor and surrounding network equipment is not enough, and the PE (power supply) line grounding of a power supply system and the logic grounding of a signal system of the equipment are not in the same ground with the lightning protection system, very high voltage is generated between the down conductor and the equipment, and discharge breakdown can occur, so that the equipment is seriously damaged, and even the personal safety is ensured. This counterattack, which is due to the grounding technique not properly handling the ground potential, causes the entire network system equipment to be completely destroyed.
The general ground potential counterattack suppression adopts a high-frequency suppressor for suppressing lightning strike voltage connected between the safe grounding and the working grounding of the system and the ground network, or a counterattack prevention diode is connected in series in the grounding system, and the lightning strike counterattack voltage is prevented from entering equipment by utilizing the one-way conduction characteristic of the diode. The simple high-frequency suppressor is actually formed by a coil with relatively high impedance, the coil has influence on a reference point (grounding) for electromagnetic compatibility of a system, the anti-back-striking diode has the problems of tolerance under the back-striking of lightning stroke and polarity of the back-striking voltage of the lightning stroke, and the electromagnetic compatibility of the system is also influenced, so that system equipment is influenced. Therefore, it is desirable to find a more reliable and reasonable back-off voltage suppression technique.
SUMMERY OF THE UTILITY MODEL
The utility model provides an experimental apparatus of earth potential counterattack suppression device, the experimental apparatus of having solved current earth potential counterattack suppression device can only fold and draw in, and its width can not carry out folding technical problem.
For solving the technical problem, the utility model provides a pair of earth potential counterattack suppression device's experimental apparatus, including earth potential counterattack suppression device and power supply support pole, two be connected with the feed line between power supply support pole and the interchange screen, two all be provided with net RTU case, one of them on the power supply support pole be provided with the net and open the case on the power supply support pole, power supply support pole earth connection.
Compared with the prior art, the utility model provides a pair of earth potential counterattack suppression device's experimental apparatus has following beneficial effect:
the ground potential of the power supply supporting rod is raised through flashover or short circuit of a contact network, the potential difference between the ground potential counterattack suppression device and a reference ground, the potential difference between a live wire in the grid RTU box and the reference ground, the potential difference between the live wire in the ground potential counterattack suppression device and the reference ground, the current of a transmission rod of the operating mechanism box and the current on grounding of an SPD in the ground potential counterattack suppression device are recorded, and power frequency ground potential counterattack caused by the short circuit of the contact network to the tower or impact ground potential counterattack caused by the impact of lightning on the tower are simulated, so that whether the ground potential counterattack suppression device can reliably protect the grid RTU box and the electric operation box is verified.
Drawings
Fig. 1 is a schematic view of the overall structure provided by the present invention.
Reference numbers in the figures: the system comprises an alternating current screen 1, a grid RTU box 2, a ground potential counterattack suppression device 3, a power supply support rod 4 and a grid unpacking 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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.
Given by fig. 1, the utility model discloses an experimental apparatus of earth potential counterattack suppression device, including earth potential counterattack suppression device 3 and power supply support pole 4, be connected with the feed line between two power supply support poles 4 and the AC screen 1, all be provided with net RTU case 2 on two power supply support poles 4, be provided with net unpacking 5 on one of them power supply support pole 4, power supply support pole 2 earth connection.
The working principle is as follows: before a test, the grounding resistance value of the power supply supporting rod 4 is detected, the ground resistance is smaller than 10 omega, the ground potential of the power supply supporting rod 4 is raised mainly through flashover or short circuit of a contact network, the potential difference between the ground potential counterattack suppression device 3 and a reference ground, the potential difference between a live wire in the grid RTU box 2 and the reference ground, the potential difference between the live wire in the ground potential counterattack suppression device 3 and the reference ground, the current of the transmission rod of the operation mechanism box and the current on the grounding of an SPD in the ground potential counterattack suppression device are recorded, and power frequency ground potential counterattack caused when the contact network short circuit the tower is simulated or impact ground potential counterattack caused when lightning strikes the tower is simulated, so that whether the ground potential counterattack suppression device 3 can reliably protect the grid RTU box 2 and the grid open box 5 is verified.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The utility model provides an experimental apparatus of ground potential counterattack suppression device, includes ground potential counterattack suppression device (3) and power supply bracing piece (4), its characterized in that: two be connected with the feed line between power supply bracing piece (4) and the interchange screen (1), two all be provided with net RTU case (2) on power supply bracing piece (4), one of them be provided with net unpacking (5) on power supply bracing piece (4), power supply bracing piece (4) earth connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120923066.3U CN215066817U (en) | 2021-04-30 | 2021-04-30 | Experimental device of ground potential counterattack suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120923066.3U CN215066817U (en) | 2021-04-30 | 2021-04-30 | Experimental device of ground potential counterattack suppression device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215066817U true CN215066817U (en) | 2021-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120923066.3U Active CN215066817U (en) | 2021-04-30 | 2021-04-30 | Experimental device of ground potential counterattack suppression device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215066817U (en) |
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2021
- 2021-04-30 CN CN202120923066.3U patent/CN215066817U/en active Active
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