Bdv of transformer oil

What is minimum BDV value of transformer oil? 30 KV As per IEC, the minimum BDV of transformer oil should be 30 KV as per transformer oil BDV test standard. The transformer oil is used in the transformer for insulation as well as for cooling purpose. The different insulating materials have different dielectric strength. BDV test means the Breakdown Voltage Test. This test is performed for verifying the dielectric strength of the oil of the transformer. Dielectric Strength is the maximum capacity to resist the voltage of insulating oil. What is the BDV of transformer? The dielectric strength of transformer oil is also known as the breakdown voltage (BDV) of transformer oil. Breakdown voltage is measured by observing at what voltage, sparking strands between two electrodes immersed in the oil, separated by a specific gap. What is size of test cell in BDV? Machine Technical Specification Input Supply 220V±10% Volts AC, 50 Hz, single phase. Test cell with Electrodes Type ‘TC-2’: 36 mm mushroom electrodes. Type ‘TC-3’: 25 mm flat disc electrodes. Type ‘TC-1’: 13 mm round electrodes. Gap Gauge 2.5 mm Printer Built in printer for printing results on plain paper. What is minimum breakdown voltage? The breakdown voltage of an insulator is the minimum voltage that causes a portion of an insulator to experience electrical breakdown and become electrically conductive. What is DGA of transformer oil? Dissolved gas analysis (DGA) is an examination of electrical transformer oil contamina...

Thetransformeroil is used in the transformer for insulation as well as for cooling purpose. The different insulating materials have different dielectric strength. The insulating material should sustain the voltage up to its dielectric strength. If the voltage is increased above the specified dielectric strength of the insulating material, the current starts flowing through it and eventually the material get permanently punctured.Thetransformeroil is hygroscopic in nature i.e it tends toabsorbthe moisture quickly. The dielectric strength of the oil gets deteriorated with the absorption of the moisture. That is why the breatherfilled with silica gel (Moisture absorbent material)is used in transformer so that external moisture during breathing can be trapped in silica gel. Circuit Diagram Core and winding of thepower transformeris submerged in transformer oil. The heatgeneratedinside the transformer due to iron lossand copper lossneeds to be dissipated outside of the transformer to limit the temperature to its safe limit. The heatgeneratedinside thetransformeris transferred to oil and the oil transfers the heat to the outer tank body and, the temperature is dissipated in the atmospheric air. The quality of the transformer oil has utmost importance for reliable operation of oil filled transformer. The reliability of thetransformercan be ensured if all the parameters of thetransformer oilare as per the standard. The one very important parameter – Dielectric strength or breakdow...

Table of Contents • • • • • Properties Of Transformer Oil The insulating oil used in the transformer as liquid insulation is a distinctive type of oil that has outstanding insulating properties which are also firm even at elevated temperatures. The mineral oil is generally used in oil-based power transformers to prevent the development of arcing and corona discharge and to throw away the heat developed inside the transformer (i.e. act as a coolant). The purpose of the insulating oil is to protect the transformer inner core and windings which are completely submerged down in the insulating oil. Also, it is the responsibility of the enclosed transformer oil to avoid the reaction of oxygen with the paper insulation which is made of cellulose material and thereby extending the life span of the transformer. The transformer insulating oil will act as a blockade between the oxygen available in the atmosphere and the solid insulation (cellulose paper) to prevent their immediate contact and thereby keep down the oxidation reaction. The amount of Insulating mineral oil placed inside the transformer is commonly evaluated by a MOG (Magnetic Oil level Gauge). The transformer insulating oil can be analysed to determine the information regarding the health status of the transformer and therefore It is named as the information carrier. PARTICULARITIES OF TRANSFORMER OIL/ Transformer oil properties The potency of the transformer insulating oil can be determined by some selected Features of...

The final part of the basic oil quality assessment trio (along with Moisture & Acidity) is the Breakdown Voltage Strength otherwise known as the BDV. The BDV is an important factor in understanding the quality of the oil and is affected in many ways. Often there is a direct correlation between a high moisture content and a reduced breakdown voltage so the two should be viewed together to understand what is causing the reduced BDV. First let’s look at the test itself. The BDV is determined by using a piece of laboratory equipment which is specifically designed for the task, a BDV Tester. The testing is carried out in accordance with IEC 60156: Insulating liquids – Determination of breakdown voltage at power frequency – Test method. In short the test measures the dielectric strength of an oil sample by applying a steadily increasing voltage to the electrodes until breakdown of the oil occurs. The issues or points of note The BDV of an oil is inherently variable and is dependent on what aligns between the 2.5mm gap between the electrodes during that specific voltage application. The methodology tries to elevate the variation by carrying out the test six times and gives the average kV which is the one you see on your oil reports. The size of the test cell…well it’s large! The test cells usually require 350 – 400ml of oil to cover the electrodes and to perform the test on the oil. When the oil samples are typically 500ml sample bottles it doesn’t give much room for manoeuvre. T...

What is the Breakdown Voltage/Dielectric Breakdown (BDV) of Transformer Insulating Oil? When a voltage is applied to the insulating oil, as the voltage increases, the current through the oil increases sharply, causing it to completely lose its inherent insulating properties and become a conductor. This phenomenon is called breakdown of the insulating oil. The critical voltage value at which the insulating oil breaks down is called the breakdown voltage or dielectric breakdown. The electric field strength at this time, called the dielectric strength of the oil, indicates the ability of the insulating oil to resist the electric field. The relationship between the breakdown voltage U (kV) and the dielectric strength E (kV/cm) is:E=U/d“ d”=The distance between the electrodes (cm). Pure insulating oils have different breakdown mechanisms than insulating oils , which usually contain impurities. The breakdown of the former is caused by the liberation, which can be explained by the mechanism of gas dielectric breakdown, that is, under high electric field strength, oil molecules collide and become free ions and electrons, thereby forming electron collapse. The electron collapses toward the anode, and the accumulated positive charge collects near the cathode, eventually forming a channel with high conductance, resulting in breakdown of the insulating oil. Generally, insulating oils always contain more or less impurities, and in this case, impurities are the main cause of breakdown o...

Break down voltage that is the full form of BDV. But break down of whom ?? Transformer oil. The voltage at which transformer oil breaks down or simply start conducting the electric current. We all know, transformer oil is used in the transformer for insulation and cooling of the transformer windings & core. So it is necessary to check its insulation capability or known as dielectric strength. If it does not have sufficient good Insulation or dielectric strength than what is the use of filling transformer with that oil. Procedure: Generally there is a standard test kit for measurement of the BDV value of transformer oil. The standard test kit is nothing but a glass box in which there are two electrodes( 2.5-4 mm spacing between them) which are connected to a high voltage supply through variac (Auto transformer). In this glass box , oil has been filled than voltage has been applied and slowly raised until there is spark. Spark between electrodes is indication that transformer oil given path for current to jump from one electrode to another electrode. That electricity flow , we see in the form of spark. When BDV value comes out to be very less, suppose we have measured a transformer BDV and it comes out ..30 KV Than what it means , transformer oil has some moisture because of which its result comes poor. All we need to filter the transformer oil . During oil filtration, transformer oil is heated and filtered out ..so moisture and any suspended impurities are removed from the ...

Dielectric breakdown of transformer oil (T-oil) and T-oil based magnetic fluid containing Mn–Zn ferrite nanoparticles is investigated in the absence and presence of magnetic fields. The influence of the time of exposure to the magnetic field on the breakdown voltage of the magnetic fluid Mn–Zn is reported for the first time. Visual evidence of bubble formation due to elevated electrical stress on the T-oil is captured to understand the BDV mechanism in the T-oil. The displacement of bubbles in relation to time is studied. This confirms the formation of bubbles and the propagation of the streamer as the mechanism responsible for the dielectric breakdown in T-oil. The T-oil based magnetic fluid containing Mn–Zn ferrite nanoparticles (1.003 vol.%) showed a 40% increase in the BDV value in comparison with pure T-oil. The increase in BDV of magnetic fluid is explained using the concept of nanoparticles acting as electron scavengers and modifying the breakdown process significantly as compared to that of T-oil. A rise in BDV over exposure time is observed at a given magnetic field. The maximum BDV enhancement in the presence of a magnetic field (20.1 mT and 20 min exposure time) is 78% when compared to pure T-oil. Improving BDV by adding magnetic nanoparticles can allow this oil to be used in higher power transformers. • Y. Du, Y. Lv, C. Li, M. Chen, J. Zhou, X. Li, Y. Zhou, Y. Tu, J. Appl. Phys. 110, 104104 (2011) • S.N. Suhaimi, A.R.A. Rahman, M.F.M. Din, M.Z. Hassan, M.T. Ish...

Oil Breakdown Voltage Kit: OTS Digital Series OTS is a fully automatic transformer oil BDV test kit designed with advanced technologies to measure the dielectric strength of transformer oil. Our transformer oil dielectric strength tester is available at reasonable price with option to choose from 60/80/100kV range. enabled OTS-A series is a fully automatic transformer oil BDV test kit designed with advanced technologies to measure the electrical breakdown strength of insulating oil. OTS-A has a quick sensing ability to measure accurate breakdown voltage. The OTS-A series is compliant with national & international standards for test sequences and also has user friendly customized test sequences. The series comes with a large LCD display with a touchpad for easy operations. It is provided with internal memory to store up to 100 tests & an inbuilt thermal printer for on-site report printing. As for safety, our transformer oil testing machine series has an open ground detection feature to avoid damage. The molded oil test vessel is suitable to test minerals, ester & synthetic oils and comes with an adjustable electrode gap setting to conduct tests as per standards. The portable voltage checker is useful for onsite calibration and verification. Ask for a quote to know the Motwane transformer oil BDV test kit price. OTS-A series has a Bluetooth connectivity module with MOT-WARE mobile app for remote access to testing data & storage in the cloud for further analysis & record purp...