• test performed on metal oxide blocks: Zinc oxide mixed with other metal oxides and sintered together. A number of developments in technology and application of mo surge arresters as well as in standardization have taken place in the past years.
Polymeric Housed MetalOxide Lightning Surge Arrester
To help ensure that the proper arrester is selected,
Metal oxide surge arrester model for fast transient simulations.
The surge arrester block implements a highly nonlinear resistor used to protect power equipment against overvoltages. The boundary between each grain and a neighbor forms a diode. A 1000 ampere surge is used for station arresters rated 108kv to 198kv. The arrestors are designed to be mounted with the metal cap pointed up on:
Product range arrester classification type max.
The lightning arrester or surge arrester is the surge protection device used to limit the overvoltages in substations to a specified protection level. The standards produced by tc 37 of iec have undergone radical changes, based on recent research work When a lightning surge (or. Under fault conditions and other system anomalies, higher than normal voltages can be imposed upon an arrester.
The relevant arrester standards and the tests
Once the voltage the arrester experiences rises above the reference voltage of the arrester, the mov blocks go into conduction. Application proper application of metal oxide arresters is needed to receive appropriate performance and adequate protection. It marked a historic breakthrough in arrester design. Figure 1 makes this clear.
2014 standard and the following tests have been successfully performed.
Metal oxide surge arresters are used to protect medium and high voltage systems and equipment against lightning and switching overvoltages. [7] fernandez f., diaz r. 2009 standard, which is the application guide for metal oxide surge arresters. With an improper arrester selection, these abnormal system voltages can cause an arrester to fail.
System voltage 2) kvrms rated voltage 2)
General smc metal oxide surge arrestors provides surge protection for dc distribution systems in transit, industrial and mining applications. Rectifiers, substations, dc feeders, on catenary poles, at the power rail, or on a vehicle. Measurements of the residual voltage of. Simulation of metal oxide surge arrester dynamic behavior under fast transients.
This type contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides, such as small amounts of bismuth, cobalt, manganese oxides, sandwiched between two metal plates, which constitute the electrodes of the device.
All current impulses have a 45/90 microsecond wave shape.
