surge arrester


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Related to surge arrester: lightning arrester

surge arrester

[′sərj ə‚res·tər]
(electricity)
A protective device designed primarily for connection between a conductor of an electrical system and ground to limit the magnitude of transient overvoltages on equipment. Also known as arrester; lightning arrester.

Surge arrester

A protective device designed primarily for connection between a conductor of an electrical system and ground to limit the magnitude of transient overvoltages on equipment. A lightning arrester is really a voltage-surge arrester.

The valve arrester consists of disks of zinc oxide material that exhibit low resistance at high voltage and high resistance at low voltage. By selecting an appropriate configuration of disk material, the arrester will conduct a low current of a few milliamperes at normal system voltage. During conditions of lightning or switching surge overvoltages, the surge current is limited by the circuit; and for the magnitudes of current that can be delivered to the arrester location, the resulting voltage will be limited to controlled values, and to safe levels as well, when insulation levels of equipment are coordinated with the surge arrester protective characteristics.

A typical surge arrester consists of disks of zinc oxide material sized in cross-sectional area to provide desired energy discharge capability, and in axial length proportional to the voltage capability. The disks are then placed in porcelain enclosures to provide physical support and heat removal, and sealed for isolation from contamination in the electrical environment. See Lightning and surge protection

surge arrester

A protective device that limits surge currents through electrical equipment.
References in periodicals archive ?
* Is it essential to install second surge arrester (SA-2) on the other side of the cable (near to transformer), If yes, what should be its rating?
Other elements that are used in the IEEE model are inductance [L.sub.0] associated with magnetic fields in the immediate vicinity of the surge arrester, stabilizing element [R.sub.0] used to circumvent possible numerical instabilities, the filter between the two nonlinear resistances consisting of [L.sub.1] and [R.sub.1] and, finally, terminal--to--terminal capacitance C of the surge arrester [1].
"We have now carried out modifications on each of our 16 vehicles by fitting new improved surge arresters, at a total cost of around pounds 2,000."
If one surge arrester is installed on each side of the fuse, the overvotlages observed at the junction of overhead line an cable can be mitigated, however, overvoltages increases as we are going away at a point on the cable from the fuse (towards far end of the cable).
PMU students were engaged throughout the visit, and were keen to know operation and application of substation equipment ranging from circuit breakers, surge arresters, instrument transformers and voltage control to Supervisory Control and Data Acquisition (SCADA) systems.
The equipment to be supplied includes power transformers, high- and medium-voltage air- and gas-insulated switchgear, instrument transformers, surge arresters as well as auxiliary and telecommunications systems.
Other important applications include cable accessories, surge arresters and bushings.
The discount is offered for homeowners who install a system that includes a lightning rod, surge arresters for the electrical entrance and surge suppressors for the resident's electronic devices.
Square D [R] SDSA secondary surge arresters include two models that meet the industry's highest reliability standards for protection against lightning and high current surges up to 40,000 A.
Standard North American Industrial Industrial Classification Classification Description Code Code Surge Arresters 3643 335931 Current and 3612 335311 Voltage Transformers Disconnect 3613 335313 Switches Sutotransformers 3612 335311 Power Transformers 3612 335311 (multiple winding type) Insulator Assemblies 3264/3644 327113/335932 for transmission lines (porcelain and polymer type) Stacking Post Insulators 3264 3327113 ABOUT THE AUTHOR