transformer oil Archive - WGM

Oil Testing | DÖPEV | Oil Sampling Control

Oil testing in systems | Oil testing | DIN EN 60422

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

Distribution transformers | ÖPEV-k | Transformer oil drain tap

Distribution transformers | Transformer oil drain tap

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

Transformer Insulation Oil Analysis | Oil Sample Analysis

Transformer station | Transformer Insulation Oil Analysis

Insulating Oil Analysis | The most important criterion of an oil-filled transformer is an intact insulation oil, thus ensuring safe operation of the transformer. Why should one carry out the oil examination of a transformer? The aging process of the insulating oil is progressing due to strong stress and thermal influences. It is recommended to take an oil sample in case of the following events: Before commissioning a new oil transformer. For regular checks during operation. In all cases where there is a suspicion of damage to the oil transformer.

In case of malfunction or when the protective devices are triggered. When taking an oil sample, some factors must be taken into account. For a transformer insulating oil inspection, it is assumed that the oil samples are filled in suitable containers. An oil sample from electrical equipment tells a lot. The oil sample serves to document trends and tests. Impurities in the oil such as particles, acid number and viscosity etc. provide information about the condition of the oil. The aim is to determine changes due to aging and to detect functional defects at an early stage. If samples are taken improperly, the resulting measurement and analysis results are invalid. Insulating Oil Analysis.

Before taking the oil sample, it must be determined according to which standard the oil sample analysis is to be performed. The quantity and also the sampling point of the oil to be extracted depends on this standard. Periodic and chemical tests as well as chromatographic analyses (Gas-in-Oil and HPLC) of insulating oil are indispensable. In order to apply the entire spectrum of oil analysis in a targeted manner, WGM Support works closely with independent laboratories.

We offer you advice on the topics of: Oil sampling | Oil analyses | Oil evaluation

Gas in Oil Analysis | TOGA-100-GC | Dissolved gas analysis (DGA)

Gas-in-Oil Analysis | TOGA-100-GC | Transformer Oil analysis

Gas-in-Oil Analysis | TOGA-100-GC – Gas-in-Oil Analysis (DGA – dissolved gases) has been successfully used for several years for the diagnosis and monitoring of oil transformers and tap-changers. DGA is considered one of the most powerful methods for assessing the condition of the transformer’s insulation system. Due to the natural ageing of the oil and the insulating materials, cracked gases are formed which are dissolved in the transformer oil. Especially under the influence of thermal or electrical faults. With the DGA analysis slowly developing faults can be detected. The temporal development of the gas concentrations allows a trend analysis.

By comparing the DGA results a characteristic fault gas pattern is determined. For the mobile DGA at the transformer on site, the TOGA 100-GC system delivers reliable and accurate measurements in a very short time. The gaseous decomposition products provide information about the type of fault in the transformer. The TOGA 100-GC system separates all eleven components of the gas to oil analysis in one injection. The TOGA 100-GC follows the ASTM 3612C method for gas analysis with headspace injection. For the laboratory gas chromatograph of the M-Labor series, there is also the option to connect an automatic sampler. The TOGA 100 Portable allows samples to be analyzed directly on site. A small helium tank is sufficient to operate the GC in the field. The column oven in each TOGA 100 GC guarantees a high sample throughput by fast heating and cooling.

The fully integrated TOGA GC systems are small, lightweight and, like all systems, modular. They can be easily upgraded and are easy to maintain. Sample information: This ASTM D3612 C method is used to analyze the eleven most common components.

We offer you advice on the topics:
Gas-in-Oil Analysis | Dissolved Gas Analysis DGA | Transformer oil analysis–

Water in Oil sensor | ST-100 Transmitter

Water-in-Oil sensor | Transformer Oil analysis

The Water-in-Oil ST-100 sensor is a temperature and humidity transmitter with a fast, reliable and accurate online transmitter for water activity in oil and temperature. The ST-100 is ideal for monitoring the humidity in oil or for online moisture measurement. The ST-100 is suitable for measuring humidity in lubricating, hydraulic or insulating oils, which is important for long-term performance and preventive maintenance of machinery and equipment. Oil moisture and water activity are automatically determined by the ST-100 Water-in-Oil Sensor.

The oil transmitter measures the water activity (also aw-value) and temperature (T). Both values can be read on the display. The humidity in oil can be given as absolute humidity in ppm or relative as water activity aw value. Our sensor measure the absolute water activity (aw) in oil and temperature (T) of the user oil continuously, reliably and accurately at all times. By integrating the measurement into the oil circuit, the measurement is carried out in real time and the reaction can also take place immediately. The risk of not detecting an increase in water activity (aw) between random measurements is eliminated.

The use of our sensors not only ensures that the quality but also guarantees safety extends the service life of the oil and minimizes downtime. The Water-in-Oil Sensor ST-100 is a robust online transmitter, which informs you reliably about a transformer failure. This is an accurate and cost-effective solution for online measurements of humidity in oil. Today’s oil sensors measure many parameters. With its robust housing and excellent performance, it is perfectly suited for integration into OEM applications.

We offer you advice on the topics of: Temperature and Humidity | Moisture Content Oil | Water Activity