Hello,
We have current transformer at neutral point of the generator.
Strangely there is a metal braid connection from the body (cast resin) to neutral point phase conductor of the generator. (I assume its for the CT iron core)
We have this metal braid from all CTs to its respective phase...
Hello,
In our Micom P633 transformer relay, we could not get the "Idiff" and "Irestain". The rest of the measurements are ok. I could be looking as the wrong group as it is on 'FT_DA' (which is fault recorder).
If I extract setting in the setting file than I could see the actual reading of...
Hi All,
I have been trying to inject current for Micom P542 and the setting of the relay is:
Is1= 0.2 pu
Ki= 30%
Is2= 2.0 pu
I was checking the low set of the cable differential protection function.
I did exactly the same like in the manual and the monitoring Bit in the Commissioning Test...
Hi all,
Once again I need a advice from gurus here. we need to prove the transformer differential setting to our client. Relay used to protect 2 winding trafo. Diff trip works fine when we inject only at HV winding (winding a)relay CT terminals (single pahse injection and 3 pahse injection)...
Hello Guys,
On our site 400KV trafo bushing and insulator was cleaned with Online Wet washing last week. The supplier for the washing system was onsite for cleaning. Only for the first time.
We had a good water resistivity 5 micro siemens/cm. And at 25bar from the pump cleaning was done with...
Hi guys,
We have a problem with the generator line current unbalanced at +6MW output and -2MWar.
Measured current at 14.5 kv (Gen Nom. Voltage); L1 = 216 A
L2 = 364 A
L3 = 286 Max and min current...
Hi,
I found a drawing of a VT in the Gen step up trafo where the VT is connected parallel to the trafo neutral earth switch (please refer to the attachement)
I know VT can be connected parallel to the power transformer neurtal resistance grounding to detect earth fault.
From the drawing, why...
Hi all, I need to make a 3phase rotation meter (to measure rotation for 400V,50hz,incoming supply from diesel) since we don't have one (we will get one soon). The test equipments which we suppost to receive are missing and its a long story. To check and confirm the incoming phase rotation is a...
Hi, in our plant would like to energise the LV board where the lube oil pump feeder is in, for the fluushing. Lube oil pump is operated via 24dc control supply (from DC UPS system). The DC UPS power is delivered from the same board there the lube oil pump is will be delivered.
We planed to...
Hi, I have trans with 20.2mva, 21kv/6.3kv, z=9.5%. If we apply 9.5% of primary rated voltage(21kv) to the primary with sec. short circuit we should have full load current at secondary winding.
If I apply 21volt(3ph) instead of 21kv to primary with secondary short circuited the current at...
Hi, anybody got experience working with the REX 010 and REX 011 module which used for Gen Stator E/F protection(59GN-95%, 64GN-100%, and 64GN)? This equipment is belongs to ABB. Why they need to inject pulse voltage at the generator neutral point?
Thanks in advance.
Hi. I am doing vector group and ratio check on the 33kva, double secondary winding tx. The tx name rating as follows.
Primary: 21kv (delta)
1st Secondary : 6kv (star)
2nd Secondary 2: 4.7kv (star)
Vector group: Dyn1 - y1
For vector group test, when I applied 400V with phase A on primary and...
