What are surge arresters used for?
What is a 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.
How does a surge arrester work?
A surge arrester works by diverting the extra voltage into the earth wire, rather than flowing through the electronic devices, while at the same time allowing the normal voltage to continue along its path. Call (214) 238-8353 us for your home service and repair needs.
What is rated voltage of surge arrester?
It is necessary to use an 18 kV arrester with an MCOV of 15.3 kV. Finally, for a resistance-grounded 13.8 kV system, the choice will be between arresters rated 12 kV, 15 kV and 18 kV, depending on the time needed to relay ground faults off the system.
What is UC in surge arrester?
MCOV stands for the Maximum Continuous Operating Voltage. COV or UC stands for Continuous Operating Voltage. They represent the power frequency voltage that may be continuously applied to a surge arrester.
What are types of surge arresters?
There are three classes of power system surge arresters: station-, intermediate-, and distribution-class. Station arresters provide the best protective levels but are more expensive. Insulation coordination is essential.
Why do lightning arresters fail?
In most scenarios, failure occurs due to dielectric breakdown, whereby the internal structure has deteriorated to the point where the arrester is unable to withstand applied voltage, whether normal system voltage, temporary power frequency overvoltage (e.g. following external line faults or switching) or lightning or …
How do you determine a surge arrester rating?
The two most important factors used to select an arrester rating are the system voltage and the neutral grounding configuration of the source transformer. These tables assume that the maximum duration and amplitude of the worst-case overvoltage during a line-to-ground fault are unknown.
What is UC voltage?
Maximum continuous operating voltage (Uc): the maximum voltage which may be connected to the SPD (sometimes referred to as its “rated voltage”. If no such waveshape or amplitude is defined, Up is assumed to be stated when the SPD is subjected to the nominal discharge current In.
Why do surge arresters fail?
When did Siemens start making surge arresters?
Siemens Energy has been designing and manufacturing medium- and high-voltage surge arresters for standard and special applications since 1925. Continuous research and development, the wealth of Siemens Energy know-how and comprehensive worldwide experience give Siemens Energy surge arresters a leading edge in overvoltage protection.
How are surge arresters used in distribution networks?
Siemens Energy 3EJ silicone surge arresters with cage design are ideally suited for reliable protection against overvoltages in medium-voltage distribution networks. The cage, made of fiberglass-reinforced plastic (FRP) rods, provides a rigid, reinforced structure ensuring high mechanical strength.
Which is the best surge arrester for indoor use?
The 3EK7 surge arrester for indoor use is a cage design surge arrester that offers the same features as the version for outdoor use. Siemens Energy 3EJ silicone surge arresters with cage design are ideally suited for reliable protection against overvoltages in medium-voltage distribution networks.
What are silicone surge arresters made out of?
Siemens Energy 3EK7 silicone rubber surge arresters with cage design effectively protect medium-voltage distribution networks from overvoltage. The cage, made of fiberglass-reinforced plastic (FRP) rods, provides a rigid, reinforced structure ensuring high mechanical strength.