Application
The tower is two or thirty meters above the ground and is exposed to the wilderness or high mountains, so there are many opportunities for lightning strikes, and reliable lightning protection measures must be taken. Overhead lines are installed with lightning rods to effectively shield the poles and towers to ensure the safe power supply of the lines. This new type of controllable discharge lightning rod is the latest research result obtained through long-term lightning protection research and a large number of high-voltage tests. Its protection range is large, the shielding rate is low, the discharge current is small, and the induced overvoltage is low. The needle releases the lightning cloud charge in the form of a slow-changing small current upward lightning discharge, and avoids the hazard of a strong downward lightning discharge as the design basis. Thousands of high-voltage discharge tests have proved that the ascending thunder caused by it has the characteristics of high protection reliability, large range, and not being affected by the height of the protective object. It is especially suitable for lightning protection of high-voltage transmission lines. Better ensure the safe and reliable operation of the power grid.
The controllable discharge lightning rod releases the lightning cloud charge in the form of a slowly changing small current upward lightning discharge, and avoids the hazard of a strong downward lightning discharge as the design basis. Thousands of high-voltage discharge tests have proved that the upstream pilot initiated by it has the characteristics of high protection reliability, large range, and not being affected by the height of the protective object.
Features:
●When the installation height of the controllable discharge lightning rod is less than or equal to 200M, the protection angle is 65°, that is, the protection radius Rx=2.14(H-Hx) on the level of the height of the protected object Hx(M), where h is the height of the controllable discharge lightning rod Installation height (M).
●The average amplitude of the main discharge current of the upstream lightning is 7kA.
●When the steepness of the main discharge current of the upward lightning flash is less than or equal to 5kA/μS, and the needle height H is less than or equal to 200M, the protection angle is 65°.
●Basically eliminate the induced overvoltage during lightning flashes.
●When the shielding probability is not more than one in 100,000, the protection angle is 55°.
●Grounding resistance ≤10Ω (in general areas); ≤30Ω (in high-resistance areas and no-man's areas).
●Wind resistance ≥ 50M/S wind speed.
●Easy to install and maintenance-free during use.
The protection principle of controllable discharge lightning rod
The discharge of thunderclouds to ground objects is nothing more than the following two ways: upward lightning flashes and downward lightning flashes.
Generally speaking, during a downward lightning flash, the pilot develops from top to bottom, and the main discharge process occurs near the ground. Therefore, the charge supply is sufficient and the discharge process comes quickly, resulting in a large secondary value of lightning current and high steepness; upward lightning flash, Generally, there is no main discharge from the upper phase to the lower phase. Its discharge current is produced by the leading process of continuous upward development. Even if there is a main discharge, it is difficult for thunderclouds to supply charge to the main discharge channel, so the secondary value of the discharge current is small and the steepness is low.
Power Grid Controlable Lightning Conductor
System characteristics
According to the empirical analysis that a rocket with a metal wire at its tail is more likely to trigger ascending thunder than a high-rise building, it is concluded that to successfully trigger an ascending thunder, the needle needs to meet the following requirements: before the ascending thunder is triggered, the space charge near the needle should be as small as possible , To facilitate the development of the discharge pulse from the needle tip upward. When an upward lightning needs to be triggered, the electric field strength at the tip of the needle should be high enough to quickly generate a discharge pulse.
Protection characteristics:
In order to verify whether the controllable discharge lightning rod achieves the design purpose, we conducted a series of tests with positive operating wave and DC respectively.
The protection curve of the controllable discharge lightning rod and the Franklin lightning rod obtained by the positive polarity operating wave discharge under the same conditions. During the test, the height of the simulated thundercloud electrode from the ground is 8.5m. In order to strictly assess the protection performance of the controllable lightning rod, there is no additional DC electric field during the operation wave test. The protection characteristic of the controllable discharge lightning rod is significantly better than that of the Franklin lightning rod. In terms of probability and scope of protection, it is satisfactory.
1. Shielding
The controllable discharge lightning rod has a considerable protection area that is hardly subject to shielding. For example, when the shielding probability is not greater than 0.001% (obviously under such a shielding probability, the probability of the protected object being shielded is quite small) the protection angle is as high as 55°. There is no area that is immune to bypass.
2. Protected range
When the probability of shielding the protected object is allowed to reach 0.1% (the allowable value specified in the current regulations), the protection angle of the controllable discharge lightning rod reaches 66.4°, and the protection angle of the Franklin lightning rod protection is much lower than this value (therefore, in It is economical to use Franklin lightning rod protection in places with strong lightning activity, and the possibility of lightning strikes still exists.)
Experiments show that:
The tower is two or thirty meters above the ground and is exposed to the wilderness or high mountains, so there are many opportunities for lightning strikes, and reliable lightning protection measures must be taken. Overhead lines are installed with lightning rods to effectively shield the poles and towers to ensure the safe power supply of the lines. This new type of controllable discharge lightning rod is the latest research result obtained through long-term lightning protection research and a large number of high-voltage tests. Its protection range is large, the shielding rate is low, the discharge current is small, and the induced overvoltage is low. The needle releases the lightning cloud charge in the form of a slow-changing small current upward lightning discharge, and avoids the hazard of a strong downward lightning discharge as the design basis. Thousands of high-voltage discharge tests have proved that the ascending thunder caused by it has the characteristics of high protection reliability, large range, and not being affected by the height of the protective object. It is especially suitable for lightning protection of high-voltage transmission lines. Better ensure the safe and reliable operation of the power grid.
The controllable discharge lightning rod releases the lightning cloud charge in the form of a slowly changing small current upward lightning discharge, and avoids the hazard of a strong downward lightning discharge as the design basis. Thousands of high-voltage discharge tests have proved that the upstream pilot initiated by it has the characteristics of high protection reliability, large range, and not being affected by the height of the protective object.
Features:
●When the installation height of the controllable discharge lightning rod is less than or equal to 200M, the protection angle is 65°, that is, the protection radius Rx=2.14(H-Hx) on the level of the height of the protected object Hx(M), where h is the height of the controllable discharge lightning rod Installation height (M).
●The average amplitude of the main discharge current of the upstream lightning is 7kA.
●When the steepness of the main discharge current of the upward lightning flash is less than or equal to 5kA/μS, and the needle height H is less than or equal to 200M, the protection angle is 65°.
●Basically eliminate the induced overvoltage during lightning flashes.
●When the shielding probability is not more than one in 100,000, the protection angle is 55°.
●Grounding resistance ≤10Ω (in general areas); ≤30Ω (in high-resistance areas and no-man's areas).
●Wind resistance ≥ 50M/S wind speed.
●Easy to install and maintenance-free during use.
The protection principle of controllable discharge lightning rod
The discharge of thunderclouds to ground objects is nothing more than the following two ways: upward lightning flashes and downward lightning flashes.
Generally speaking, during a downward lightning flash, the pilot develops from top to bottom, and the main discharge process occurs near the ground. Therefore, the charge supply is sufficient and the discharge process comes quickly, resulting in a large secondary value of lightning current and high steepness; upward lightning flash, Generally, there is no main discharge from the upper phase to the lower phase. Its discharge current is produced by the leading process of continuous upward development. Even if there is a main discharge, it is difficult for thunderclouds to supply charge to the main discharge channel, so the secondary value of the discharge current is small and the steepness is low.
Power Grid Controlable Lightning Conductor
| Model: | RY-CPGL500KV |
| Protection Angle | 65° |
| Earthing Resistance | ≤10Ω |
| Wind Resistance | 50M/S |
| DC Voltage | 10kV 35kV 110kV 220kV 500kV |
System characteristics
According to the empirical analysis that a rocket with a metal wire at its tail is more likely to trigger ascending thunder than a high-rise building, it is concluded that to successfully trigger an ascending thunder, the needle needs to meet the following requirements: before the ascending thunder is triggered, the space charge near the needle should be as small as possible , To facilitate the development of the discharge pulse from the needle tip upward. When an upward lightning needs to be triggered, the electric field strength at the tip of the needle should be high enough to quickly generate a discharge pulse.
Protection characteristics:
In order to verify whether the controllable discharge lightning rod achieves the design purpose, we conducted a series of tests with positive operating wave and DC respectively.
The protection curve of the controllable discharge lightning rod and the Franklin lightning rod obtained by the positive polarity operating wave discharge under the same conditions. During the test, the height of the simulated thundercloud electrode from the ground is 8.5m. In order to strictly assess the protection performance of the controllable lightning rod, there is no additional DC electric field during the operation wave test. The protection characteristic of the controllable discharge lightning rod is significantly better than that of the Franklin lightning rod. In terms of probability and scope of protection, it is satisfactory.
1. Shielding
The controllable discharge lightning rod has a considerable protection area that is hardly subject to shielding. For example, when the shielding probability is not greater than 0.001% (obviously under such a shielding probability, the probability of the protected object being shielded is quite small) the protection angle is as high as 55°. There is no area that is immune to bypass.
2. Protected range
When the probability of shielding the protected object is allowed to reach 0.1% (the allowable value specified in the current regulations), the protection angle of the controllable discharge lightning rod reaches 66.4°, and the protection angle of the Franklin lightning rod protection is much lower than this value (therefore, in It is economical to use Franklin lightning rod protection in places with strong lightning activity, and the possibility of lightning strikes still exists.)
Experiments show that:
- The discharge time of the controllable discharge lightning rod is 13.3us earlier than that of the Franklin lightning rod on average.
B. When the simulated electric field is relatively low, the corona current of the controllable discharge lightning rod is much lower than that of the Franklin lightning rod, and it is almost completely suppressed.
C. When the simulated electric field increases and the thief can start the controllable discharge lightning rod, the pulsed corona discharge current generated by the controllable discharge lightning rod has a corona current amplitude dozens of times larger than that of the Franklin lightning rod, but the average value of the corona current is higher than the latter. It is small, which is conducive to the transformation from corona to leading arc.
