IEC. First edition. Surge arresters –. Part 6: Surge arresters containing both series and parallel gapped structures –. Rated 52 kV and less. This part of International Standard IEC applies to surge protective devices designed for repeated operation to limit voltage surges on a.c. power circuits. This part of IEC applies to non-linear metal-oxide resistor type surge arresters without spark gaps designed to limit voltage surges on a.c. power circuits.
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Therefore, and since metal-oxide resistors are not permanently connected to the line, the following items are not considered for this document: This edition includes the following significant technical changes with ice to the previous edition: Gapless surge arresters must be selected with sufficient steady-state self impedance to withstand the application of line-to-earth power frequency voltages under all system conditions of operation.
The second application criterion to be met is a condition established by the effectiveness of system grounding.
Using Metal Oxide Varistors MOVs having excellent electrical properties, these arresters provide superior overvoltage protection for MV distribution systems. Consider the permissible magnitude and duration of these overvoltages including the full time of system back-up protectionwith appropriate allowances for any recent arrester discharge energies. Systems which permit earth faults to remain undetected or operate with one phase earthed for periods in excess of 24 hours will require the use of an arrester having a Uc continuous capability equal to the system maximum phase-to-phase voltage.
A disconnector that has operated gives a visual indication of internal arrester damage and the need for arrester replacement. NKI – tension insulators Our tension insulators have specified mechanical load 90 kN. Table 1 in Catalog Section I provides a general application guide for the selection of the proper arrester rating for a given system voltage and system grounding configuration.
Manufacturing our own MOV disks allows strict quality control over the manufacturing process from start to finish. The disconnector will sense and disconnect the ground terminal in the unlikely event of arrester failure, preventing a permanent system short circuit. To ensure that the arrester’s capabilities will not be exceeded, the resources of the Thomas A.
IEC System of Conformity Assessment Schemes
Our showroom A41 was in Hall Designs with the EGLA’s external series gap installed in parallel to an insulator are not covered by this document.
This second edition cancels and replaces the first edition published in The advantages of polymer housed arresters — reduced size and weight, and enhanced safety — have been refined in this new generation of surge arresters: Valid Estimated date of Estonian 06099 publication: Give feedback about the content of this standard. In addition to testing to evaluate the performance of the MO resistors, procedures for evaluating the performance of the EGLA series gaps have been introduced.
After production, every MOV disk must pass a series of electrical tests designed to ensure the highest individual disk quality. Also, such a fair allows us to understand and analyze the competition. The fair fulfilled our expectations.
Under some special system conditions, such as transformer energization using certain types of connections and ferroresonance, higher voltages can be experienced by the arrester. Accessories for overhead networks We produce different patented accessories for MV power lines.
Surge Arresters 5 kA and 10 kA Class 1 IEC for MV Systems to 36 kV
Learn more about cookies. PKI – post insulators They have an innovative insulating head with integrated conductor clamping system. We are particularly pleased by the visit of this fair because we carried out some business talks with potential customers with whom we met at the Hanover Messe fair in previous years.
LV surge arresters They have IP67 protection which ensures reliable operation in all environments. In addition, long term environmental testing has verified the lifetime superiority of UltraSIL silicone rubber when compared to other polymeric insulating materials.
Most contain our own built-in innovative patented solutions. Surge arresters – Part 8: