Hi AAffoonnjjee,
Personally, I have experienced with CYME, SKM and ETAP all are good engineering software but ETAP has a better user friendly features compare to others nowaday!!
It is easy to do actually for transfer or importing exchange database between software. Note that ETAP can compare...
I used to read this and it is good summarize the correlation between the two stds.
https://www.linkedin.com/pulse/hazardous-area-classification-guidelines-john-kingsley
Regards
Hi Bill,
The procedure i shared is mainly applicable for power distribution sector in Oil& Gas, Petrochemical & chemical plant only. For utilities may be some criteria different approach from what i shared which is i am not fully aware of.
Thanks & Regards
Thanks Bill!
Do we have any standards on this requirement? Please share if any.
To me the PTC device acts like barrier which we normally designed for intrinsically safe circuit which is most of the case is applicable for zone 0! But the EX motor is normally installed in zone 1&2 only. Correct me...
Dear All,
Can anyone explain why we need a separate PTC device or module for VFD driven Ex Motor (zone 1& 2 classified area) for the thermal protection?
I received this requirement from my client. Currently our design is without this device means the PTC signal from Ex Motor going into the VFD...
Hi. I share here in attached file for your information. Hope it helps.
It based IEC std.https://files.engineering.com/getfile.aspx?folder=64c43f85-a886-405e-9401-edf2d095c94b&file=Tx_Sizing.PNG
Additional info;
IEC/TR61641 criteria 1 to 7 which is switchgear and personnel protection.
Duration of the test:
The arcing time is set for 300ms. If during the test the arc extinguishes within 150ms, then the test is repeated using the same point of initiation. A further repetition is not...
Hi All,
About IEC what is @FPelec posted is correct.
I want to add following;
1- No any relation between arc duration and short circuit withstanding time of the switchgear.
2- Any fault shall be cleared within max. 200-250msec. this is main principle of protection relaying.
3- I do not see any...
Dear All,
Needed your technical and commercial aspects on the subject for distribution system and oil& gas application only. I am searching your feedback on both aspects technical and commercial also pro & cons.
Appreciate your feedback.
Thanks
ElecEE8
I have the same view with RRaghunath!
With this scheme you have only low. imp. REF protection. To achieve diff. TR you definitely need CT4 to complete the scheme.
Just wanted to share what we have specified in standards of GIS regarding overpressure device requirements. You may get some idea on this.
"Each gas compartment shall have its own pressure relief device (automated external pressure relief device) to provide instant and safe discharge of...
Hi Jamador,
So, in worst case you may need to spend time to customize your cable since you have data sheet which I also used to do sometime when we could not find that specific cable in ETAP library.
Hi jamador
All Prysmain cable libraries are available in ETAP for your ready reference.
As I know there are three (3) types available which are Prysmain, PrysBS6622 and PrysFFS110.
When you design your raceway and placing cable in the RW. In the cable editor, you need to tick "Link to Library"...
Dear All,
It took us couple of week on technical discussion & clarifications with EPC and Vendor (Compressor & Motor). Following are conclusion and agree path forwards;
- Single bearing is not acceptable. Motor will be double bearing since the clarification from Vendors (Compressor and Motors)...
Dear All,
We are actually in discussing with the EPC and Vendor for the mentioned proposal. Note that we are in EPC stage of the project.
We have two issues in discussion;
1- Why it is the single bearing motor has been designed for the compressor? On this we have commented that with this design...
Dear Edison,
We may need to run this motor alone for maintenance purpose (de-coupling from the compressor) i.e. solo run test/no load test for any trouble shooting.
The Vendor introduce the jacking oil system to support to run this motor alone for de-coupling condition with low speed.
Anybody...
Dear All experts,
The question here I have is, how we operate or maintain the solo run test and any others low speed maintenance activities for the single bearing 11kV motor (1.3MW)? I mean to whenever we have a decoupling condition of the motor from its compressor package. The motor has single...
None of them can detect unbalance on the load side!
On the feeder side to load, you need to have a full set of protections i.e. 50N/51N and also 50G/51G (ground/sensitive earth fault). 51N shall have a proper coordination with both upstream (incomer)& downstream (outgoing feeder to load).
If the...
