What is surge arrester?

What is surge arrester?

A surge arrester is a protective device for limiting voltage on equipment by discharging or bypassing surge current. It prevents continued flow to follow current to ground and it is capable of repeating these functions as specified per ANSI standard C62. 11. An arrester does not absorb lightning or stop lightning.

What are types of surge arresters?

There are three classes of power system surge arresters: station-, intermediate-, and distribution-class.

What is difference between lightning arrester and surge arrester?

Surge arrester protects the installation from inside while lightning arrester protects the equipment from outside. Surge arrester protects the system from lightning, switching, electrical faults, and other transients voltage and surges while lightning arrester is mainly used for lightning strikes and associated surges.

What are arrestors?

Arresters are typically installed near critical appliances or points of entry, such as an electrical panel or near a generator. When potentially dangerous lightning strikes, the arrester activates and diverts the lightning to ground, where it will disperse harmlessly.

Where is surge arrester placed in substation?

Surge arresters can be placed on the both ends of substations, transformers, circuit breakers, reactors, capacitors and also high long bus-bars and etc. Therefore, failure of arresters during overvoltage can put substations in risk condition.

What is surge arrester explain its function as a shunt protective device?

A surge arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events.

What is an arrester electrical?

A lightning arrester (alternative spelling lightning arrestor) (also called lightning Isolator) is a device used on electric power transmission and telecommunication systems to protect the insulation and conductors of the system from the damaging effects of lightning.

What is surge in electrical?

In general a surge is a transient wave of current, voltage or power in an electric circuit. In power systems in particular – and this is likely the most common context that we relate surges to – a surge, or transient, is a subcycle overvoltage with a duration of less than a half-cycle of the normal voltage waveform.

Where do you put a surge arrester?

In an electrical systems, surge protection devices (SPDs) are usually installed in tap-off configuration (in parallel) between the live conductors and the earth. The operating principle of SPD can be similar to that of a circuit breaker.

What is surge voltage?

Surges can also be referred to as voltage swells. They occur when the voltage increases by 10% or more above the nominal mains supply. Voltage surges share many of the same causes as sags. They can also occur when a large load is turned off, resulting in voltage on the power line increasing for a short period of time.

What are surge arresters made of?

Lightning arresters used in power substations are large devices, consisting of a porcelain tube several feet long and several inches in diameter, typically filled with discs of zinc oxide. A safety port on the side of the device vents the occasional internal explosion without shattering the porcelain cylinder.

What will you do if the surge arrester is damaged?

Characteristics of Different Surge Arrester Types.

  • Silicon Carbide (SiC) Valve-Type Surge Arresters.
  • Metal-Oxide Surge Arresters (MOSA) A metal-oxide surge arrester contains non-linear metal–oxide resistive disc elements with excellent thermal energy withstand capabilities.
  • Surge Arrester Classification and Application.
  • Insulation Coordination.
  • What are surge arrestors used for at a substation?

    UHVAC surge arresters are usually installed in the vicinity of the main electrical equipment in substations to suppress lightning and switching overvoltages and thereby protect the electrical equipment in UHV substations.

    How to diagnose high voltage surge arrester?


  • Discharge Voltage Table.
  • Arrester Ratings: MCOV and Rated Voltage.
  • 8/20μs Maximum Discharge Voltage.
  • .5μs 10kA Maximum IR.
  • Switching Surge Maximum IR.
  • Arrester Rating Selection.
  • System Line-to-Line Voltages.
  • Recommended Arrester Ratings.
  • Four-Wire Wye Multi-Grounded Neutral.
  • What is a riser pole arrester?

    Reduce creepage by 1.45 inches (36.8mm) when ordering without insulating bracket.

  • Weight does not include metal mounting hardware
  • MCOV = Maximum Continuous Operating Voltage that may be applied continuously between the terminals of the arrester.
  • https://www.youtube.com/watch?v=bikqpnWzrTE