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Transec cl3a standing frame | Transec
Description
TRANSEC Online Drying System uses molecular sieves in order to extract moisture from the oil. These granules (non chemical) contain many pores of 3 Angstrom diameter which is the exact size to catch water molecules. That way other components like gases molecules with larger or smaller sieves.TRANSEC Online Moisture Monitoring system uses the moisture and temperature sensors MMT162 from VAISALA on the inlet and on the outlet of the system in order to monitor the PPM and temperature of the oil flowing through the TRANSEC. This data is transferred to the TRANSEC monitoring box for analysis.
As the sensors are immerged in oil there is no risk from external contamination and as the sensors are not changing the repeatability is ensured. Thanks to the constant sampling from the MMT162, the PPM and temperature can be followed remotely on the webserver which allows assessment of the moisture level in the transformer and to observe the effect of the filtration.
• Based on the Oomen curve calculation the trend of the water content in paper can be followed (see figure 7)
• Monitoring the PPM vs Temperature hysteresis enables observation of its shape. A narrow shape below 20% moisture shows a healthy transformer while a broad hysteresis exceeding 20% relative saturation (TR P1) on the picture below is a sign of a moist transformer.
Streamer offers 3 types of moisture monitoring cabinets:
• The basic type is with a local display showing the PPM of moisture and the oil temperature from two VAISALA MMT162 sensors. This data can also be transferred remotely through 4-20 mA analog outputs.
• The second version is similar to the basic cabinet except that the data is transferred through fiber optic
• Finally an advanced type with an integrated webserver offering a comprehensive view and analysis of the moisture situation within the transformer. It is also possible to access the data remotely, save it and to set alarms. Data is available locally on the display or remotely via a connection RJ45 or Ethernet.
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Description
Maintaining a low level of moisture in a transformer provides significant benefits in terms of operations and risk as it maintains a constant high insulation level. It is therefore possible to load the transformer at a higher level and to make this load vary without risking of damaging the transformer.Also it has consequent financial benefits since it elongates the life of the asset by slowing down the paper degradation. This degradation creates particles or even sludges. Finally moisture is also responsible for the creation of acids in the oil. Hence keeping a low level of moisture will lower the maintenance costs.
Only continuous filtration is efficient in removing moisture from a transformerAs moisture is created continuously and as it is one of the major concern for the transformer safety and life expectancy,it seems counter intuitive to apply a temporary solution for this continuous problem. Also it is important to note that more than 98% of the water in a transformer is in the paper while a very low amount is dissolved in oil. The diffusion time of water from paper to oil is very slow. This is why punctual filtrations are not solving the moisture issue.
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Name : Transec CL3A Standing Frame
Brand : TRANSEC
Transec Electric is the new name for Transec UK Ltd. which was established over 15 years ago and since 2004 Transec has managed over 3350 Transformer On-Line Molecular Sieve Drying System projects worldwide.
Transec has supplied to over 20 countries including UK, China, India, Germany, South Korea, Australia, Saudi Arabia and Russia. UK installations have included UKPN, National Grid, SSE, Scottish Power, EDF Energy UK, EON, WPD and NPG.
Transec Electric Limited will continue to manufacture, support and develop Transformer On-Line Molecular Sieve Drying Systems and Services from its base in Haverhill, Suffolk., UK.
Since the beginning, Transec's business has been focused on the reliability of transformers, with one of the most important features – continuously removing water from the insulating oil of a power transformer.
Why is it so important?
Power and distribution transformers are some of the most important and expensive assets in a power network. Compared to other equipment, they are very reliable and require very little maintenance since they have no continuously moving parts. However, the insulating materials, being organic, degrade with time in service, and ultimately determine the end of life of the transformer.
In a poorly maintained free breathing transformer water can enter through the natural expansion and contraction of oil as the temperature cycles, but also water is a by-product of the breakdown of the long chain hydro- carbon glucose molecule, as a result of thermal and electrical stress. This leads to degradation of the organic insulation materials as the transformer ages.
Excessive moisture will saturate the insulation and increase its conductivity. At higher temperatures, vapour or free moisture can develop increasing the risk of partial discharge.
TRANSEC is an online molecular sieve, developed and manufactured in the U.K. that is designed to continuously remove water from the insulating oil of a power transformer. As the ppm level in the oil is reduced, water from the solid insulation (where over 95% of the water will accumulate) will migrate from the insulation into the oil to redress the natural equilibrium. This process not only reduces ageing, but will improve the dielectric strength of the insulation, and increase reliability.
