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  • Users: slavag
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  1. slavag

    78V/Vector Shift/Voltage Surge/Vector Surge protection in the Distribution Generation system

    Dear Colleagues. What is experience with this type of anti-islanding protection? What is regulation/standards in your system. Thanks in advance
  2. slavag

    Power Transformer 300/150/150MVA cooling type.

    Dear Colleagues. What is preferable cooling type of Power Transformer 300/150/150MVA 161/33/33kV? It will be Step-Up transformer. Generation type : PV and BESS. ONAN/ONAF ONAN/ONAF/OFAF ONAN/ONAF/ODAF Thanks a lot in advance!
  3. slavag

    MV Voltage Regulator, 32x5/8%

    Dear colleagues. We are try first time connect voltage regulator in our application. Actually, we have two options now: Cooper and Siemens single phase voltage regulator. Our system is 22kV, compensated grounding. Three single phase VR will be connected in closed delta or ungrounded Wye type...
  4. slavag

    Dy transformer

    Dear colleagues. I'm found in one of projects step up transformer D(22kV)/y (11.5kV ). To Y side is connected generator with HI grounded star point. Y neutral point is free. No generator breaker, no island mode. What is recommended in this case: grounded via surge arrester. close neutral pin...
  5. slavag

    Transformer for 18-pilses VFD

    Dear All. We need ordered transformer 36/0.4kV 1000kVA for feed few VFD's 18-pulses. Are it some special transformer? Thanks in advance
  6. slavag

    YnDyn0 vs Dzno, advantages and disadvantages

    Dear all. We have two options for replace a old transformers YnDyn0. by same new or by Dzn0. Dzn0 is cheaper, but we do not have any experience with such transformer. Please share your experience in this case. Thanks in advance.
  7. slavag

    Power Transformer GSU 11/66kV 35MVA

    Dear All. We urgently locking for such power transformer for permanent installation. Could you help us with this issue.
  8. slavag

    Reverse Power trip

    Dear All. Attached disturbance recorder of reverse power trip, Comtrade format, protective terminal Micom P345. Diesel generator 17MW. Du-fuel, in trip time was operated on gas with about 13-14MW load. Setting P1< 3% 10sec with 3sec reset time P2< 8% 1sec with 0.1sec reset time. Trip was after...
  9. slavag

    Solar power plants

    Dear Colleagues. I'm locking for some fundamental documentation about utility size of solar power plants. Point is not inverters or strings, issue is connection to MV level and auxiliary supply of inverters, optional configuration: ring, star, option of outdoor solutions, protection and...
  10. slavag

    Out of phase connection of generator breaker.

    Dear friends. We are looking for Comtrade format file of such incident. Possible file with block generator-transformer. Maybe, someone have it in archive. Thanks in advance. Best Regards.
  11. slavag

    Zigzag transformer calculation

    Dear All. Im so sorry, Im open new thread with more or less same name. Zigzag grounding transformer make me crazy :-). Data of zagzag transformer (about 20 years old). Data from transformer ( sent me by mobile, from site :-) ) S=2078kVA I rated= 150A I rated for 3 hours=181A Short circuit in...
  12. slavag

    SEL311L, help.

    Dear Friends. Sorry for such kind of Q's. I must connect SEL311L in my application, its decided today before few hours. We don't have any expirience with SEL, we don't have any local support. Setting, software, commissioning, no problem, we have enough time. I need urgently few issues. CT...
  13. slavag

    Transformer winding temperature trip.

    Dear All. Do you use for such trip some electronic devices, like to EPT202. http://www.reinhausen.com/desktopdefault.aspx/tabid-289/139_read-106/? its good device, but I wouldn't like use it for trip of GSU, only as alarm or cooling control. What is your practic? Thanks in advance.
  14. slavag

    RS485 tester

    Im locking for some RS485 tester or maybe its protocol analyzer. In network so much types :-). Could you please recommend some good stuff. Thanks in advance.
  15. slavag

    Reactive power regulation on the island power plants

    Dear All. Do you use Capacitor banks on the generation buses in case of island power plants? On the one bus up to 4-6 generators and outgoing feeders. Thanks in advance. Best Regards. Slava
  16. slavag

    SPEEDTRONICÖ MARK V

    Dear All. We try found description of following setting of the SPEEDTRONIC™ MARK V synchronization part. 1.generator synch voltage error high limit = 2% 2.generator synch voltage error low limit = 0,0% 3.system synch frequency error high limit = 0,4Hz 4.system synch frequency error low limit =...
  17. slavag

    Areva CCV documentation

    Dear All. We are locking for documentation/schemes of Areva CCV, type: CCV-550 07-XB-700-401/004 We tried on the Areva site, Alstom grid site,....nothing. Issiue is: grounded or not grounded not used HF output. Thanks in advance. Best Regards. Slava
  18. slavag

    Substation and Power Plant DC, for control and protection

    Dear Colleagues. What type of DC power supply for the control and protection are used in your substations and power plants? Our standard is floating DC batteries with on-line grounding monitor on "-" and "+" poles. Are some one has experience with "-" grounded pole batteries? Thanks in advance...
  19. slavag

    Photovoltaic invertor connection to MV grid

    Dear All. We work now on some technical evaluation of Photovoltaic invertor connection to MV grid. Power is about 1MW. Im "responsible" for the protection requerements. Actually, from my point of view, its same as co-generation issue. Im use standard protection 50/51/49/67N And would like use...
  20. slavag

    Protection of Motor-Transformer block.

    Dear All. Im locking for MV ( about 5MW ) block Motor-Transformer protection scheme solution. On the motor side a system is ungrounded. Issue is additional capcitor banks for the PF correction. Capacitor bank will be installed in the 87T zone. What is better: used 3-winding 87T functionality or...

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