Transformer station testing – Let us advise you on the subject of transformer station testing!
Especially now, when the demand for energy is increasing rapidly, transformer stations represent a reliable connection to the medium voltage or low voltage network.
Testing transformer station: But there are some transformer station regulations: revisions of electrical systems and equipment are required by law. Namely in the DGUV V3, the VDE 0105 and the DIN 57 105. All in all, you must carry out a transformer station test at least every four years. Nevertheless, it is recommended to clean the transformer station annually and also to carry out a visual inspection. In fact, if the maintenance or servicing of the electrical equipment is neglected, the risk of a sudden shutdown increases. This causes, among other things, high costs. Moisture, aging or dirt – all these are factors that can affect electrical equipment and even cause electrical accidents. Basically: inspection of transformers or transformer maintenance is indispensable.
Transformer station maintenance: Generally, an important part of transformer testing is to monitor oil samples and determine age-related changes as well as detect defects. That is because contaminants such as particles, oil aging products or acids tell a lot about the condition of the oil. Making it even more important to take regular oil samples so as not to limit the service life of the transformer oil and to maintain its quality. Possible weak points inside the transformer can be detected by the degradation or decomposition products dissolved in the oil. Here, the gas-in-oil analysis can also come into play to determine the aging process of the oil. To summarize, it can be said that what matters most is the right way of analyzing the oil, so that the sample ultimately remains rich in content.
For this purpose, we recommend the oil sampling kit ÖPEV and DÖPEV. Consisting of the oil drain adapter (ÖPEV-k) and the control unit (DÖPEV), the kit guarantees absolute ease of use for safe oil sampling from transformers. Besides these two tools for oil analysis, the kit also contains a handwheel, aluminum bottles, a sampling syringe and the NW22 and NW31 reducing rings.
The oil sampling set is used to take oil samples from electrical equipment such as transformers, converters or oil switches. When taking oil samples, make sure that the oil sample complies with the prescribed standard. A potential manipulation of the oil sample falsifies the analysis result. The big advantage of oil sampling with the Oil Sampling Set is that no outside air gets into the sample. The set ensures sampling according to the following standards: DIN EN 60567, IEC 567 and ASTM 3612, so the oil sample is ideally prepared for subsequent analysis in the laboratory. In order to avoid repairs and failures, the oil sample must be handled with care.
An early analysis of potential faults extends the service life of electrical equipment. Oil sampling is a crucial element in any oil analysis. Insulating oil analyses: These periodic tests are an important part of the maintenance of transformers for a safe energy supply. In the operational monitoring of oil-filled high-voltage equipment (transformers, instrument transformers, bushings, cables, etc..), decomposition gas analysis is becoming more and more a priority and an important part of the maintenance process. In case of electrical or thermal overload, decomposition gases are formed in the insulating oil, which can be analyzed.
Improper oil sampling or contamination of the test vessels can have a very large influence on the measured values of the individual test methods, so that completely wrong conclusions could be drawn about the quality of the insulating fluids. The oil syringes and aluminium containers must be rinsed with the liquid to be tested before taking the sample. Bottles made of brown glass or drawn aluminium are used as sample containers for insulating oils. Not only the sampling, but also the handling of the oil sample plays an important role.
We offer you advice on the topics of:
Oil sampling | Transformer Oil analysis | Insulating Oil testing
DÖPEV – the display oil sampling device with a twist for oil sampling according to DIN EN 60475 (VDE 0370-3).
Failures due to faulty transformer oil analysis can lead to negative and detrimental developments. They can evidently have serious effects on the power supply and the service life of the transformer. Sampling the oil from oil-filled transformers in operation is an efficient method for determining the condition of the solid and oil insulation. In addition to that, it provides information about the operating condition of the transformer.
And it does so without having to open or deactivate the transformer. Improper oil sampling or contamination can have an immense influence on the measured values of the individual test methods. Ultimately, this can lead to false conclusions about the quality of the insulating liquids. To ensure consistent performance and long transformer life, regular oil testing in installations is essential.
Taking oil samples without contamination
The overall aim is to remove the oil from a transformer without contamination. To further carry out an oil test in the laboratory and analyse the sample. Your result of the “gas in oil analysis” or the other “dielectric measurement methods” can only be as good as you have taken your oil sample. With the new oil sampling system DÖPEV you take the oil sample free of contamination. As well as according to the standard and without contact with the outside air.
ÖPEV-k and DÖPEV: undoubtedly the perfect oil analysis set
These periodic examinations are generally an important part of the maintenance of transformers for a safe power supply. Not only the sampling, but also the handling of the oil sample plays a major role. Sampling and handling are made very easy and effective with the ÖPEV-k and the DÖPEV. Basically, this allows you to carry out an insulating oil test in no time at all. The ÖPEV-k oil sampling device guarantees absolute ease of use for safe oil sampling from oil-filled transformers. In combination with the DÖPEV display oil sampling device, oil sampling becomes even easier.
By means of three ball valves on the DÖPEV you can regulate the oil sample. Furthermore, you can constantly control the temperature of the oil. The oil analysis device DÖPEV can be connected to the oil drain device ÖPEV-k and creates the perfect oil analysis set. With this set you can take the oil sample from the transformer comfortably and contamination-free. And in the next step, transport it to the oil test in the laboratory.
We offer you advice on the topics: Insulating oil sample | Oil testing | Oil analysis device
Oil filled distribution transformers are a very important part of the power supply, regardless of their size. By performing targeted inspections, maintenance, and servicing, it is possible to extend their service life. However, to properly analyze the contained insulating oil and draw a possible diagnosis, it is necessary to extract the oil correctly. If the insulating oil the transformer contains is faulty, this can in fact lead to serious consequences.
ÖPEV-k oil drain device for local network and distribution transformers
This therefore means that accurate results of insulating oil analysis are critical to the condition of the transformer. The results of an oil sampling additionally determine the further course of action with the oil transformer. In general, the ÖPEV-k is ideally suited for oil sampling, namely on an oil local network transformer. Or on distribution transformers that have a difficult or poorly accessible oil drain valve. On some transformers it is very complicated to take an oil sample. For example, on concrete or complete stations.
But ÖPEV-k guarantees absolute ease of use for safe oil sampling at the distribution transformer. Adapters for the nominal width 22 NW and 31 NW are available as accessories. Consisting of stainless steel, the ÖPEV-k and the adapters thus come in a robust and compact design. The oil drain device ÖVEP-k is screwed onto the drain tap of the transformer with the adapter (for example NW 22). The shaft is then used to open the drain valve of the transformer and the ÖVEP-k fills with oil.
In total, there is an oil sampling tap and a vent valve on the ÖVEP-k. Consequently you can connect a hose to the oil transformer drain tap of the OVEP-k to remove the oil sample without contamination. WGM Support also offers a remote sampling kit to control the oil sample. In summary, the ÖPEV-k is the ideal and indispensable tool for effortless oil draining from oil distribution transformers.
We offer advice on the topics of:
Distribution transformers | Oil sampling | Insulating oil analysis
Glass syringe Luer Lock | Glass syringe 100 ml – The glass syringe Luer Lock has a metal cone connection. Plunger and glass body are made of chemical and heat resistant borosilicate glass. The glass syringe body and plunger are stamped. This makes the syringe and plunger unmistakable. The printed writing is acid and alkali resistant. The syringes are shipped individually and packed in a cardboard box with foam filling. The glass syringes in modified design are ideally suited for Gas-in-Oil Analysis.
The delivery program of WGM Support consists of high-quality glass syringes with a large variety. The glass syringes are available with a capacity of 1 ml to 200 ml. The picture shows a glass syringe 100 ml type WGM-100. The glass syringe is an injection syringe with calibrated cylinder. The 2-way stopcock with Luer-Lock is optionally available. Advantages and features: The syringe is made of heat resistant borosilicate glass. It complies with ISO 594/1; 595/2 and is in accordance with IEC 60475, IEC 60567 and ASTM 3613 standards.
The material and construction are resistant to shock and shock from sudden temperature changes. The syringe is annealed until it is free of internal stress, then it is repeatedly washed with hot water. At the breakage points of the syringe such as the Luer-Lock connector and the cylindrical housing, the points have been reinforced to reduce the risk of breakage. The matching syringe plunger has been checked for leakage, meets the requirements of specification GG-S-92 / 54840 / ISO 7886, and is carefully checked for back pressure and for smooth plunger movement.
We offer you advice on the topics of: Glass syringes | Dissolved Gas Analysis (DGA) Glass Syringe