Power-Frequency Overvoltages The second application criterion to be met is a condition established by the effectiveness of system grounding. Under some special system conditions, such as transformer energization using certain types of connections and ferroresonance, higher voltages can be experienced by the arrester. The second application criterion to be met is a condition established by the effectiveness of system grounding. The rating of an arrester is the maximum power frequency line-to-ground voltage at which the arrester is designed to pass the IEC operating duty test. In addition, long term environmental testing has verified the lifetime superiority of UltraSIL silicone rubber when compared to other polymeric insulating materials. 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. 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.
| Uploader: | Meztinris |
| Date Added: | 14 December 2016 |
| File Size: | 47.80 Mb |
| Operating Systems: | Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X |
| Downloads: | 34515 |
| Price: | Free* [*Free Regsitration Required] |
UltraSIL silicone rubber will not support biological growth algae and mildew and is non-flammable. Manufacturing our own MOV disks allows strict quality control over the manufacturing process from start eic finish.
The voltage withstand capability application on ungrounded systems is 1. To ensure that the arrester's capabilities will not be exceeded, the resources of the Thomas A.
Search results | IEC Webstore
These MOV disks have proven their reliability and protective abilities through years of in-service use. The rating of an arrester is the maximum power frequency line-to-ground voltage at which the arrester is designed to pass the IEC operating duty test.
Using Metal Oxide Varistors MOVs having excellent electrical properties, these arresters provide superior overvoltage protection for MV distribution systems. 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.
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.
The advantages of polymer housed arresters — reduced size and weight, and enhanced safety — have been refined in this new generation of surge arresters: Under some special system conditions, such as transformer energization using certain types of connections and ferroresonance, higher voltages can be experienced by the arrester.
Surge Arresters 5 kA and 10 kA Class 1 IEC for MV Systems to 36 kV
The UltraSIL housed surge arrester incorporates the industry recognized kec polymeric material — silicone rubber. 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 iex 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.
A ground lead disconnector is optionally available for use 60099-4 systems having 20A or more of available fault current. One must pay particular attention to systems having low coefficients of grounding, ungrounded systems and systems that are resonant grounded or that may become ungrounded under abnormal conditions of operation. Power-Frequency Overvoltages The second application criterion to be met is a condition established by the effectiveness of system grounding. Edison Technical Center and their systems application engineers are available to make recommendations.
The second application criterion to be met ie a condition established by the effectiveness of system grounding. In addition, long term environmental testing has verified the lifetime superiority of UltraSIL silicone rubber when compared to other polymeric insulating materials.
Consult with your Cooper representative to have your individual system application needs studied. Independent laboratory tests have verified the superiority of silicone rubber in terms of hydrophobicity, resistance to UV and surface tracking performance in contaminated environments, chemical inertness, temperature stability and other key insulating properties.
Iec 60099 4 latest version
The disconnector will sense and disconnect the ground terminal in the unlikely event of arrester failure, preventing a permanent system short circuit. After production, every MOV disk must pass a series of electrical tests designed to ensure the highest individual disk quality.
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.
No comments:
Post a Comment