thermionic1
Electrical
- Nov 30, 2018
- 314
Our team is commissioning a large station with 20+ Sf6 breakers of 345 & 138 kV Ratings. Following the OEM and Client specifications, we first slow close and measure stroke and wipe with static measurements. Main Contact and time travel measurements are then made, using the OEM's supplied transducer brackets and installation instructions. What we find is that the main contact measurements are spot on with the OEM data, but the travel measurements are flagged when compared with the OEM specs. Part of the problem, I believe, is that the entire cabinet where the transducer is installed is violently shaking during operation.
After discussing this with the timing test set OEM, we are told to remove the evaluation criteria for travel measurements (record data only). The GCB OEM tells us that if our slow close (manual close) stroke and wipe measurements are OK, ignore the travel data. It turns out that the OEM uses a different transducer type and mounting arrangement, so their factory test data is not possible to replicate in the field, using their supplied transducer mounting brackets and installation methods.
So why do we bother to take these additional travel measurements if the factory says to ignore and the test set vendor says the same? Currently we have to qualify each travel test with disclaimers from the GCB and Test Set OEM's.
Does anyone else have similar problems?
After discussing this with the timing test set OEM, we are told to remove the evaluation criteria for travel measurements (record data only). The GCB OEM tells us that if our slow close (manual close) stroke and wipe measurements are OK, ignore the travel data. It turns out that the OEM uses a different transducer type and mounting arrangement, so their factory test data is not possible to replicate in the field, using their supplied transducer mounting brackets and installation methods.
So why do we bother to take these additional travel measurements if the factory says to ignore and the test set vendor says the same? Currently we have to qualify each travel test with disclaimers from the GCB and Test Set OEM's.
Does anyone else have similar problems?