5/23/2014 9:08 AM | |
Joined: 10/9/2007 Last visit: 9/5/2024 Posts: 1249 Rating:
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Hi Navnag I don't know if the voltages and times I mentioned are exactly in the norm you need, these are values taken from Siprotec - except that 5kV is for microseconds, not seconds. Take a look at a catalog from Siprotec and you can see, for example: Insulation test Voltage test (100 % test) all circuits except for auxiliary voltage and RS485/RS232 and time synchronization. Impulse voltage test (type test) all circuits, except communication ports and time synchronization, class III; 5 kV (peak value); 1.2/50 μs; 0.5 J 3 positive and 3 negative impulses at intervals of 5 s EMC tests for interference immunity; type tests Standards IEC 60255-6; IEC 60255-22 (product standard) EN 50082-2 (generic specifi cation) DIN 57435 Part 303High-energy surge voltages (Surge) IEC 61000-4-5; class III Auxiliary voltage: From circuit to circuit: 2 kV; 12 Ω; 9 μF across contacts: 1 kV; 2 Ω ;18 μF Binary inputs/outputs: From circuit to circuit: 2 kV; 42 Ω; 0.5 μF across contacts: 1 kV; 42 Ω; 0.5 μF Detailed info at http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/Protection/overcurrent-feeder-protection/Pages/7SJ64.aspx# go to Download/Catalog. Maybe the manual has even more information About the "33kV": the devices are not intended to be protected from the 33kV itself, but from the inducted voltages created by the 33kV or short-circuits in the medium/high voltage. Depending on several factors, 33kV may induct high voltages on the metal parts near the live conductors. 33kV is medium voltage and Siprotec orany local IO deviceare normally installed just above the circuit-breaker, in the same cubicle. But this is not the only problem. On High voltage substations, except for GIS, the HV devices are on the field, far away from Siprotec. Siprotec is connected electrically to the fields for binary input/output, current and voltage measurement. When there is a short-circuit on the field, the inducted voltage reaches Siprotec by these wiring from the field. This is the reason why the binary IO must also have 2kV isolation, not only the analog inputs. Mike |
Last edited by: Mike J at: 5/23/2014 9:08 AMEnergy Automation products: Sicam, Siprotec, Digsi |
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5/23/2014 12:49 PM | |
Joined: 11/21/2007 Last visit: 8/12/2024 Posts: 2325 Rating:
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This discussion sure is an eye opener for me.... To Continue the Discussion, I have extracted the attached dataS7-300 Manual. I however wonder how that compares with SICAM as I could not find SICAM EMI compatibility data even after lot of Googling ... May be you can help out with this...
Well .. for sure I did'nt see any special modules in the other SIMATIC systems installed.
Agree with you 100% ... but sometimes the systems are Over-Specified ... even when not needed. Cheers Navnag AttachmentS7300_EMI_Compatibility.pdf (305 Downloads) |
Last edited by: Navnag at: 5/23/2014 12:50 PMThere is no such thing as the last bug in a program |
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