Application: 

A lightning Arrester / Surge Arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events. The typical lightning arrester has a high-voltage terminal and a ground terminal. At normal Voltages the MOV disk is an insulator and will not conduct current. But at higher voltages caused by lightning it becomes a conductor and pass the voltage to earth via its ground terminal.

Standard:

Our Surge Arresters are manufactured &Type tested as per IS:      and IEC: 60099-4 respectively.

Construction: 

Our lightning arrester are Gapless metal-oxide type, consist of Zinc-oxide Visitors with superior non-linear voltage-current characteristics, FRP Core/Plastic core and Silicone Housing. We are supplying our Surge arrester with Mounting bracket and disconnecter as per customer requirements’.

What exactly does a lightning arrester do?

It is never absorb the lightning, it is can’t stop the lightning but it can divert the lightning to the earth and only protect the equipment electrically that are connected parallel to it. There are two types of surges one comes externally from atmosphere such as atmospheric lightning. Second type is originated from electrical system itself, such as switching surges.

When an electrically charged cloud comes nearby an electrical transmission line, the cloud induces electrical charges in the line. When the charged cloud is suddenly discharged, through lightning, the induced charged in the transmission line is no longer confined static. It starts travelling and originate dynamic transient over voltage. This transient over voltage travels towards both load and source side, on the transmission line because of distributed line inductance and stray capacitance. This surge voltage travels with speed of light. At the end of the transmission line, as the surge impedance changes, the surge voltage wave reflected back. This forward and backward travelling of surge voltage wave continues until the energy of the surge or impulse is attenuated by line resistance. This phenomenon causes voltage stress on the transmission system many times greater than normal rated voltage of the system. Hence, surge protection scheme must be provided to the electrical power transmission system to make reliable and healthy system.

PARAMETERS

11 kV

22 kV

33 kV

Rated Arrester Voltage 9 kV(r.m.s) 18kV(r.m.s) 30 kV(r.m.s)
Highest system voltage 12kV(r.m.s) 24kV(r.m.s) 36kV(r.m.s)
Rated Frequency 50Hz 50Hz 50Hz
Discharge Class DISTRIBUTION/CLASS-I & II DISTRIBUTION/CLASS-I & II DISTRIBUTION/CLASS-I & II
Nominal discharge Current 5kA/10 kA 5kA /10 kA 5kA/10kA
Maximum Continuous Operating Voltage 7.56 kV(r.m.s) 15 kV(r.m.s) 25kV(r.m.s)
Partial Discharge in Pc. Less than 10 pC Less than 10 pC Less than 10 pC
Lightning impulse Voltage of Housing. 75 kVp 150 kVp 170 kVp
High Current impulse withstand at 4/10  μs 65kV/100kV 65kV/100 kV 65kV/100kV
One minute Power frequency With stand Voltage of housing. 28 Kv(r.m.s) 50 Kv(r.m.s) 70 Kv(r.m.s)