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Thyrite type lightning arrester
Blocks the surge voltage appearing in a line
Absorbs the surge voltage appearing in a line
Offers a low resistance path to the surge appearing in a line
Returns the surge back to the source
Offers a low resistance path to the surge appearing in a line
A Thyrite lightning arrester is a non-linear resistor device used to protect power equipment from high-voltage surges. It functions by providing a low-impedance path to the ground when the surge voltage exceeds the normal operating level, thereby safely diverting the surge current.
A Thyrite lightning arrester is a non-linear resistor device used to protect power equipment from high-voltage surges. It functions by providing a low-impedance path to the ground when the surge voltage exceeds the normal operating level, thereby safely diverting the surge current.
I=KVa тАФ The non-linear volt-ampere characteristic of Thyrite material, where a is the exponent of non-linearity.
The resistance of Thyrite, a form of silicon carbide, is non-linear and follows the relation I=KVa. Under normal system voltage, it offers high resistance, acting as an insulator; however, under high-voltage surge conditions, the resistance drops significantly, allowing the surge energy to bypass the protected equipment to the ground.
Thyrite is a compound of silicon carbide.
It exhibits a voltage-dependent resistance drop during surges.
The surge current is safely bypassed to the earth.
It does not 'absorb' energy but redirects it.
Extremely fast response time to surge transients.
Capable of handling repetitive surges without performance degradation.
High degree of reliability in power systems.
Requires proper maintenance to ensure gaps remain dry.
Resistance characteristic may change slightly over a long operational life.
Protection of transformers and generators.
Used in transmission lines and substation equipment protection.
The value of exponent 'a' for Thyrite is typically between 3.5 and 7.
Option B is incorrect because a lightning arrester does not 'absorb' the energy (like a capacitor or battery) but redirects it to the ground.
Option D is incorrect because the arrester does not return surge back to the source; it shunts it to the ground.
C is correct тАФ Thyrite lightning arresters act as non-linear resistors that provide a low-resistance shunt path to divert high-voltage surges safely to ground.
Always remember that protective devices like arresters are 'shunting' devices; they never 'block' or 'absorb' surges, they simply provide an easier path for current to flow away from sensitive equipment.