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Recent content by adityalagudu

  1. adityalagudu

    CT & PT test blocks

    Are there any guidelines or periodic activities to replace/check the CT&PT test blocks?
  2. adityalagudu

    4160/115/230 VAC Control Transformer Failure and Motor trip

    Waross, Thank you for your input. We are using secondary voltage as 115V for our applications. SO there is a jumper between X2 and X4; X1 and X3. Our circuit is connected to terminals X1 and X4. So I think the connections are good. See the attached for reference. There is another aspect we...
  3. adityalagudu

    4160/115/230 VAC Control Transformer Failure and Motor trip

    We have the following CPT installed for our motor circuit controls; Primary 4160 VAC Secondary 115/230 VAC 3KVA, 60HZ, K-Factor 1 3A fuse on primary, 20A fuse on Secondary We installed these CPTs a few months back in 4 of our motor feeder units. We had trip incidents on all 4 motors and...
  4. adityalagudu

    Micrologic 5.0 P Main breaker Trip

    The timing on the picture was wrong, as it was set improperly. This event happened on new gear, installed recently. We don't want to trip the breaker on UV, so currently thinking to change to Alarm only. We thought UV can happen when there is a trip in the upstream line and excessive load on...
  5. adityalagudu

    Micrologic 5.0 P Main breaker Trip

    One of our Micrologic 5.0 P main breaker has been tripped due to Isd = 7500A, due to a blip in the 25KV high voltage side. We are thinking about adjusting the Under-voltage trip settings but there isn't any history of UV trip on the trip unit. We are trying to identify the root cause and come...
  6. adityalagudu

    Type of GE Fuse and Fuse Sizing

    Attached for the Motor name plate details. https://files.engineering.com/getfile.aspx?folder=c7479f0e-ce5a-4138-840b-4843ab105d35&file=Pump_A_motor_Name_plate.jpg
  7. adityalagudu

    Type of GE Fuse and Fuse Sizing

    I want to know more details on this GE Fuse, It is hard to find the info on the Web. Please see the attached. Does this fuse come under Nontime Delay or Dual element(Time-Delay) Fuse? According to NEC code, what should be the Max fuse size that can be used for 460V, 220A, H Class, 60HZ...
  8. adityalagudu

    Old GE powermaster low voltage switchgear Arc flash incident

    These cables are routed through Cable Tray. I will check for the grounding, I am confident that we don't have a grounding on the cables. I don't have an exact 1200A Fuse photo, but I have 800A which is similar. See attached for reference...
  9. adityalagudu

    Old GE powermaster low voltage switchgear Arc flash incident

    @Rahunath There is a Very OLD gear, there is no overcurrent protection with trip settings and delay time on the feeder breakers. In that case, there is no Incoming Main Breaker to isolate the Switchgear from Transformer. You can see it on SLD.
  10. adityalagudu

    Old GE powermaster low voltage switchgear Arc flash incident

    @ Kiribanda Thank you for your input. Yes, the Transformer is solidly grounded. The fuses for the feeder are 1200A. We observed that one of the feeder breaker fuses were blown. As far as the cable grounding between feeders and the Motor, these are 3/C 500 MCM cables. There is no grounding...
  11. adityalagudu

    Old GE powermaster low voltage switchgear Arc flash incident

    The Breakers doesn't have any LT/Inst trip units on it, been though these breakers are feeding cooling tower pump motors. Testing was done on the Breakers 2 years back and they have a testing sticker on it. The heaters are not working on the switchgear. The incident started at one cubicle and...
  12. adityalagudu

    Old GE powermaster low voltage switchgear Arc flash incident

    see the single line for referencehttps://files.engineering.com/getfile.aspx?folder=94b5ef4b-c22b-45c3-8a8d-46dcb0d8ced2&file=sld.JPG
  13. adityalagudu

    Old GE powermaster low voltage switchgear Arc flash incident

    One of Old GE Powermaster low voltage switchgear experienced a major arc flash incident a few days back. We are looking for a potential root cause for this incident. Please see the single line for reference, there is no overcurrent relay protection on the gear. We are looking into several...
  14. adityalagudu

    5KV Synchronous Motor trip

    We have 4160V, 500HP Synchronous motor tripped yesterday. There are no flags on the GE multiline relay and the PF trip is disabled on the relay. We did the Megger, Temp measurement, PI on the motor, everything is normal. This Motor is 25 years old, and the excitation is not AVR controlled, it...
  15. adityalagudu

    Preventive Maintenance Strategy for Motors

    Would appreciate it if you can provide your thoughts on the Preventive Maintenance Strategy for Motors. I am particularly looking for 3 phase Motors under 100HP. What should be the replacement period for motors under 100HP, based on the criticality level of A, B, C? Which standards are a good...
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