Hi,
I have a question regarding fall of potential ground testing. I'm familiar with the common FOP methods, including the slope method. However, my question relates to test electrode measurement when the surrounding terrain is not flat. Example, I have a substation grounding system at the...
Hi,
I have a quick question regarding the MiCOM P122.
In the relay manual it states that the operation TIME tolerance for thresholds I>, I>> and I>>> is +/- 2% +30...50ms. Therefore, am I correct in thinking the NEGATIVE tolerance for a set curve is 2% of a set value. Also, that the POSITIVE...
I have a quick question about current transformers.
I have a relay that requires a CT with a burden of 2.5VA (1A secondary CT) or 7.5VA (5A secondary CT).
I only currently have access to a 400:5 (2.5VA burden) 5P20 CT. However, as my fault and load current is low (less than 80A and 1600A...
Hi,
I'd be grateful if someone could provide me with some help. I'm trying assess a wye (primary), delta (secondary) transformer under a secondary line to line fault. I have determined the secondary fault current in phase B and C using symmetrical components. However, I'm unsure how to obtain...
This thread is regarding closed thread238-106630 which discusses the use of symmetrical components to study load imbalance.
Figure Fig. 21(l) as given by jghrist (from the T&D book) appears to indicate that two of the loads (Zb) have identical impedances, is this correct? Any idea how this...
Hi,
Please can someone give me some guidance or point me in the direction of some literature relating to single phase loading of a three-phase Star Delta (YNd11) transformer.
My understanding is that when the primary neutral is connected, a sole single phase load connected between two phases...
