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  • Users: varri79
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  1. varri79

    Short time Overload on a transformer while starting a motor

    Dear Folks, I am working on a modification project (brown field, where new loads are going to be added in the existing power system. Existing system: Existing Transformer capacity is 300KVA, 11KV/415V, 417A, z= 5%, Existing LV switchgear is 630A (Both breaker & bus bars). Existing base load...
  2. varri79

    Test coupons

    Dear Gentlemen, In our organisation, we have 20MG water tanks with CP and 8 test blocks are provided around each tank. Each test block consists of 3-terminals (structure, test coupon and reference cell). But these test coupons are not bonded with the structure. Is it require to bond the test...
  3. varri79

    XLPE cable puncture

    Dear Gentlemen, We have noticed a small puncture (approx 0.5 sq.mm )on R-core (near termination, both R-core and Y-core are touching each other)of XLPE 11kV cable at feeder end. And also noticed white precipitation around the puncture. But puncture is not upto the conductor level, perhaps pin...
  4. varri79

    Transformer Vibration - Dry type

    Dear Gentlemen, What are the reasons for vibration of dry type transformer enclosure? How can we find the cause? Specs.: Rating: 2000kVA, 11/0.414kV,50Hz dry type transformer Your answer will be highly appreciated
  5. varri79

    Cathodic Protection - 100mV Shift

    Dear Gentlemen, I am new for this forum. In impressed current CP, what is the significance of 100mV shift? I knew that reference potential will be measured after immediate switching of Anode current. Advanced thanks...
  6. varri79

    VRLA Batteries

    Which testing method (Load test / internal impedance measuring method) is recommonded for testing the following specified battery banks for maintenance purpose? And also recommended frequency of testing? Specs: Make: Hawker,Type of battery: Lead ACID, dry type, Individual cell Voltage: 2V, No...
  7. varri79

    Inverters

    Any Gentlemen can please explain me the difference between voltage source inverter and current source inverter? Advance Thanks..

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