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  1. Emad Shaaban

    Transformer partial discharge process

    Hi all We have noted a surface partial discharge on dry resin 20kv/6.6kv 1.5MVA transformer,please see pictures The only available test for me are insulation resistance test ,high pot and ratio test by cbc100. IR 200Mohm PI 2.5 My question are: How serious their conditions are?can it be kept...
  2. Emad Shaaban

    Heat treatment machine power supply issue

    Hi every one A heat treatment machine (pro heat 35) works with power supply 470v/575v..please see attachment What options I have to make this machine works on 380v power supply
  3. Emad Shaaban

    2MVA generator

    We’ve just completed a bearing replacement for a 4-pole, 50 Hz, 2 MVA synchronous generator. Before full commissioning, we urgently need clarification on the following points: Minimum Speed for Voltage Generation: What is the minimum rotor speed at which we can expect the generator to...
  4. Emad Shaaban

    Generator with low IR

    We are currently assessing the condition of a three-phase 2.5 kVA, 400V emergency generator, which is used for black start only. During our routine checks, we observed the following insulation resistance values: • Initial readings (before cleaning): • Phase to ground (IR): as low...
  5. Emad Shaaban

    ALSTOM MX3VIR016A PROTECTION RELAY PROGRAME

    Dear experts, I’m working in Generator protection panel that equipped with several ALSTOM relay: MX3AMD20A MX3DPG3A MX3IPG1A MX3IPG2A We need to connect these relays with PC to uploads and downloads the configuration files rather than doing it manually. Iam trying to find what is the PC...
  6. Emad Shaaban

    Electrical motor with rotor issue

    Hi everybody A 1800kw electrical motor running with normal temperature and current but with a humming noise.CBM team saying that no vibration has detected because of bearings or a mechanical issue, however the vibration specturm analysis shows frequency of 100hz beside the Ffund 50hz .We are...
  7. Emad Shaaban

    Nuisance tripping in Sepam T40

    The Transformer feeders in our plant are running by Sepam T40s at both primary and secondary sides. During the last 8 years we encountered issues that happened quite several times ,in which the Sepam of Primary record an external trip and open its SWG.. This configured external trip input is...
  8. Emad Shaaban

    Defected 200kw Motor rotor

    Is there any method to detect failure in the rotor of a 200 kW motor that produces a humming noise? In a previous experience, a similar motor exhibited a similar noise, and upon disassembly, we found that its rotor had elimination gaps. I am wondering which technique could help determine...
  9. Emad Shaaban

    Transformer humming

    50kva transformer supplying battery charger system start making a loud humming sound with load and. With noloaf ,transformer insulation resistance is high,but when using scope meter,output currents was distorting any help Wave form...
  10. Emad Shaaban

    Noisy UPS Transformer

    Hello experts DC UPS system supplied with 50KVA transformer , Recently Transformer humming (noise ) became up-normal . this start happened in different UPS system in our site. humming Transformer was replace with new Transformer but the sound still high. -Transformer output AC waveform was ...

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