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The load is compressor and 14 sec means starting time of compressor. Starting current is around 1540A and the current stays at 1540A for 10-11Sec (the rest of 3-4 Sec is the time until the current reaches the peak current from start). After 14 Sec, current drops to normal current (around 300A...

In our plant, electric system consists of 35kV/6kV/400V. (Current voltages are approximately 35kV/6.2kV/413V) We ran the MV motor (6kV, 3100kw) connected to soft starter. It took around 14Sec until bypass mode and once current reached at the starting current(around 1540A), it stayed at the...

Hi, folks. In our plant, we have 6kV switchgear A/B and there is NO bus tie. And the bus tie is supposed to be closed when there's undervoltage in upstream of A or B (called ATS : Auto Transfer System). We got an undervoltage trip accident recently on 6kV swichgear A(due to cable problem on...

I found the reason of those. At one of the load connected to the SWGR A, L2 was connected to enclosure. After removing this, all came back to normal. And unlike my assuming, we found Neutral line is grounded. But still unclear since GND(SWGR A) was connected to L2, but GND(SWGR A) - GND (SWGR...

<unclebob> Can you please tell me your idea?

<HamburgerHelper> You also think that N is not grounded, and L2 is grounded. So there is current flowing to ground from L2. Am I understanding right? <davidbeach> I think I need to look in to GND fault protection. But simply followings came to my mind. 1. If L2 is grounded, L2 and GND are...

If L2 is grounded, shouldn't the system have already been tripped by Overcurrent or GDN fault relay protection?

We've got connection as following in our substation. 6/0.4kV Transformer (N is grounded) -----------BUS BAR(U/V/W/N)-------------LV Switchgear And our system's Neutral is grounded. In SWGR A side, all voltage measurement is OK. But we have some problem on voltage measured from SWGR B Side...

We're running the motor (300kW) and people have tried to get rid of vibration on it. I've though that vibration is only about mechanical part and nothing to do with electric. Somebody asked me if there is any elements in terms of electric that need to be considered. Do you think there is any...

<7anoter4 > Thanks for reply. According to your find, 1.5m should be given between generator and building. But still not clear about between transformer, process area. Where I'm carrying out the project is CIS country and they also follow Russian Code (for instance, PUE(Russian Electrical...

Thanks you all. At first, I though of just simple circuit for understand. But considering VSD consists of capacitor bank, inductor, etc. which is not that simple as circuit and is considered as power converter, I realized that I shouldn't think just like (input current) = (output current)...

Mike, We'll run it once or twice a year in case black out. Once it runs, it will run about 1-2 hour before truck arrives.

We are planning to install the diesel generator in oil refinery plant(standby 185kW) with 350 liter integral tank located on the bottom of generator. We're gonna install it near substation where 35/6kV transformers are installed nereby. Now I'm looking for any international code regarding...

In our plant, we have 6kV compressor connected to VSD. And I got some question regarding current discrepancy between VSD and Switchgear. I found that during compressor operation, the current indicated in Switchgear (21A) is lower than in VSD(28A). If the current in VSD is lower then I would...