Hi,
Recently, there was a failure in one of our transformers in the field.
Based on the relay protection records, there was an LL fault in the transformer and confirmed after untaking the transformer that there was a fault between 2 phases in its Deenergized Tap changer.
Debris was found...
Hi,
How to determine the zero sequence impedance of an autotransformer with a tertiary winding?
The following are the specifications I received from the manufacturer, the positive sequence impedance is stated as 0.2%, but there is no data for zero sequence impedance, is there a rule of thumb...
Hi,
I tried to measure the current and voltage of an induction motor driven by a VSD. The measurement was taken at the input of the VSD, and the results are as follows:
Voltage:
Current:
The waveforms are heavily distorted, especially the current waveform. Is this normal? Could it be...
Hi All,
At my workplace, there is an 34.5 kV subsea distribution cable that is 30 km long, connected to WIDP01 and KARA01 bus.
Both WIDP01 and KARA01, have generators connected at a voltage level of 13.8 kV (generator at KARA01 is not shown in this drawing), where the transformers used are...
Hi All,
There are GE L90 Line Differential relays communicating via TDM-based network installed on our field.
Due to network infrastructure upgrade, our ICT team want to replace the TDM-base network with Ethernet based network.
Is it possible for line differential relay communicating via...
Hi All,
Is it possible for MV Fuse to have expiry date? I mean if one fuse surpassed it's expiry date/lifetime then it won't work properly.
Anybody have technical reference related this issue?
Thanks
Angga
Hi All,
In my plant, there are some MV Gas Insulated Switchgear (SF6) that have low gas indication.
Is it safe to operate it with no load but energized condition?
Thanks,
Angga
Hi All,
Recently there was single line to ground fault in my plant,
Below is the fault current recorded by the relay:
Can someone explain why the fault current mostly exist at positive value? Is this because of the DC component? but the fault current didn't seem to be decaying.
Thanks...
