The Transinor equipment mentioned above is for HV GIS and MV cable terminal Partial Detection.
Similar to the used for Transformers (different frequency sensors).
These ultrasonic and acoustic methods depends very much in the operators skill and experience, for the noises in a substation.
In...
The fault seams to be like leakage problems, or better say SF6 contamination problem.
If there has been leakage, there could enter moisture inside, many CB manufacturers of HV CBs use dew-point meters for evaluation of gas contamination (with moisture).
It`s all Ok what has been said for this voltage and power range transformer.
- mayor of utilities use tangente delta and capacitance tests of 2.5 or 10kV that is enough hign so as to detect problems in commissioning transformers.
- at rated and upper voltages is used for lab tests only for the...
About your repair question, my experience is more in SF6 circuit breakers (from 30 to 500kV)
1.- SF6 gas leakages are very nasty, as one hair beneath a joint or o-ring can cause leakage, you have to use very sensitive detectors as recommended.
2.- leakages as I experienced are normaly in...
I would add the oil quantity, kVA or MVA of the Tx.
We have some similar problems in new 83.33MVA autotransformers, que maker claims its a gas evolving problem of the oil, but no paper backs it.
Our opinion and is backed by other external opinions is that may be a design problem. As only H2 and...
What is really dangerous in any refilling is the entrance of moisture, most gaskets are dry and aged so care of replacing them with the adecuate ones.
If not your problem would be big.
You must as it is above consult an expert like bushing factory, so as to have the procedure.
Also beware of...
Dear sirs:
The gas content seams to be normal.
DGA needs to analysis 3 items.
1- the gas content, there are two limits, one minimun for being considered and the upper limits.
2- the gas ratios, using diferent criterias such as Rogers, IEC, Dornemburg, Duval.
3- the trending of the 2 items.
It...
Hi
Failure noormaly are due to moisture inside the arresters, because of seal failures.
Preventive maintenance.
- visual inspection of external part, may be a cuasi-failure with a superficial track and seals condition.
- PF measure with Doble equipment
- LCM leakage current meter, that are test...
Yes it's not very common, but when you have vibrations enough to fatigue and break conections between conductor and bushings, I really think is something to worry about.
So we are not so bored as you see.
We are aware of bread, butter and coffee tests but, that is another story. Although...
Dear sirs:
I am interested in measuring vibrations in HV Power Transformers and Shunt (line) Reactors.
Could you be kind enough for giving me some help in this?
- where to find information of the tests and analisys?
- which are the most suitable test sensors and equipment?
Thanks in advance
hy
If the transformer has OLTC in HV side is advisable to perform the Excitation Current test in all taps.
If in MV also has NLTC, for having a benchmarking test the contact resistance of all taps (usually 5 taps)
IEEE-STD 62-1995 (I think so) is a good reference.
Insulation power factor...
Many current models of Peugeot cars on sale in UK are fitted with an auto wiper system. The sensor is fitted on the inside of the windshield and I believe uses some sort of infra red beam reflection/scatter detection of raindrops on the outer surface. I drove a loan car fitted with such a...
