A lightning arrester is a safety device that directs lightning or high voltage safely into the ground so that electrical equipment is not damaged. It is applied in transformers, substations, and solar systems.
Benefits of Lightning Arrester:
- Offer Protection:
Makes the system secure during voltage or lightning strikes.
2. Reduces Equipment Ageing:
Safeguards electrical appliances from voltage surges, hence longer equipment lifespan.
3. Enhances System Reliability:
Guarantees unbroken and secure electricity supply.
4. Inexpensive Safety
It’s a cheap and low-cost device but gives very effective protection.
Disadvantages of Lightning Arrester:
1. Works Only Up to a Certain Voltage:
If the voltage is excessive, the arrester will not work.
2. Needs Maintenance:
It needs to be checked regularly; otherwise, it will not function.
3. Risk from Wrong Installation:
If installed improperly, it will not give protection.
4. Performance Affected by Weather:
Excessive humidity or dust can make it less effective.
Importance in Solar Systems:
Employing a lightning arrester in solar systems is extremely crucial as solar installations are usually done in open spaces, rooftops, or fields where lightning danger is greater.
Benefits of Lightning Arrester in Solar Systems:
Saves Solar Panels:
Saves solar panels from destruction during lightning or voltage spikes.
Saves the Inverter:
Inverters are delicate and the arrester prevents them from getting burned.
Enhances System Performance and Life:
Prevents voltage shocks and increases the life of the system.
Transfers Surge Voltage to Ground:
Transfers dangerous voltage in a safe manner to the ground, safeguarding the home or farm.
Installation Points in Solar Systems:
On the DC Side:
Placed between the solar panels and the inverter.
On the AC Side:
Placed between the inverter and the load/grid.
With the Earthing System:
Effective protection requires a solid earthing system.
Some Precautions and Disadvantages:
A low-quality or cheap arrester will not give complete protection to the system.
Upon installation, ensure that the polarity and rating are appropriate.
The arrester must be inspected at least annually.
