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Power Distribution Equipment
Published in Dale R. Patrick, Stephen W. Fardo, Brian W. Fardo, Electrical Power Systems Technology, 2021
Dale R. Patrick, Stephen W. Fardo, Brian W. Fardo
Lightning arresters (see Figure 9-3) must have a rigid connection to ground on one side. The other side of the arrester is connected to a power line. Sometimes, they are connected to transformers or the insides of switchgear. Lightning is a major cause of power system failures and equipment damage; so lightning arresters have a very important function. Lightning arresters are also used at outdoor substations. The lightning arrester is used to provide a path to ground for lightning strikes or hits. This path eliminates the flashover between power lines, which causes short circuits. Valve-type lightning arresters are used frequently. They are two-terminal devices in which one terminal is connected to the power line, and the other is connected to ground. The path from line to ground is of such high resistance that it is normally open. However, when lightning, which is a very high voltage, strikes a power line, it causes conduction from line to ground. Thus, voltage surges are conducted to ground before flashover between the lines occurs. After the lightning surge has been conducted to ground, the valve assembly then causes the lightning arrester to become nonconductive once more.
Power Distribution Equipment
Published in Stephen W. Fardo, Dale R. Patrick, Electrical Power Systems Technology, 2020
Stephen W. Fardo, Dale R. Patrick
Lightning arresters must have a rigid connection to ground on one side. The other side of the arrester is connected to a power line. Sometimes, they are connected to transformers or the insides of switchgear. Lightning is a major cause of power-system failures and equipment damage, so lightning arresters have a very important function. Lightning arresters are also used at outdoor substations. The lightning arrester is used to provide a path to ground for lightning strikes or hits. This path eliminates the flashover between power lines, which causes short circuits. Valve-type lightning arresters are used frequently. They are two-terminal devices in which one terminal is connected to the power line, and the other is connected to ground. The path from line to ground is of such high resistance that it is normally open. However, when lightning, which is a very high voltage, strikes a power line, it causes conduction from line to ground. Thus, voltage surges are conducted to ground before flashover between the lines occurs. After the lightning surge has been conducted to ground, the valve assembly then causes the lightning arrester to become nonconductive once more.
Power Delivery Systems: Transmission and Distribution
Published in J. Lawrence, P.E. Vogt, Electricity Pricing, 2017
Protection of distribution lines and facilities from overvoltage and overcur-rent conditions is a critical matter. A frequent cause of potentially damaging voltage transients is lightning, which can initiate a high voltage wave that can travel a considerable distance along a distribution line. Lightning arresters are routinely installed for protection of equipment, such as line transformers. Lightning arresters are also installed at strategic locations along a feeder. A lightning arrester diverts a voltage surge to ground potential thereby dissipating the destructive level of energy produced by the lightning strike.
Seismic qualification and time history shake-table testing of high voltage surge arrester under seismic qualification level moderate
Published in Cogent Engineering, 2018
Noman Ullah, Syed Mohammad Ali, Rahman Shahzad, Faisal Khan
The electrical equipment selected for seismic qualification in the present investigation was a “132 kV Metal-Oxide Gapless Surge Arrester”, Type: Y10 W-120/295, manufactured by “Wenzhou Yikun Electric Company, Ltd, China”. According to IEEE standards, surge/lightning arrester is a protective device for limiting surge voltages on the equipment by diverting surge current and returning the device to its original status. Surge arresters are usually installed between phase and earth/neutral, parallel to the equipment that is to be protected against over-voltages. Surge arrester was selected for seismic qualification test because it is used to protect transformer; transformer is the most important and costly equipment in electric supply substation.