Can vacuum oil filter completely remove acetylene?

- Mistakes of transformer manufacturers in purchasing oil filters -

1、 Features:

Many users report that the current vacuum oil filters (including domestic and imported oil filters) can not completely remove acetylene from transformer oil. The ZYA double stage vacuum oil filter produced by us can ensure that no matter how much acetylene content is in the oil before treatment, the acetylene is zero after treatment through the analysis of a precise chromatograph. Unconditional return if this point is not reached.

2、 Manufacturers troubled by acetylene:

Many users reported that they had several vacuum oil filters, and in the past, they did not have strict requirements on acetylene, so the acetylene problem was not prominent. Now, the acetylene of transformer oil is required to be 0, and the accuracy of chromatographic analyzer has been improved. As a result, many oil filters cannot solve the acetylene problem. Some oil filters filter repeatedly for more than 10 days, and the transformer oil still contains acetylene.

In October last year, our institute transformed 3 sets of Kato oil filters in Japan and replaced 3 sets of domestic oil filters for Xinjiang TBEA Co., Ltd. The main problem of the six oil filters is that there is acetylene in the filtered transformer oil and the oil filtering performance is poor. Through the technical transformation and replacement of our institute, the acetylene after oil filtering has been completely eliminated, and the oil filtering effect has been greatly improved.

In August 2005, Henan Luoyang Wanji Aluminum Co., Ltd. installed six new 220KV energy-saving transformers. The company has one imported oil filter and two domestic oil filters to filter oil on site, but they cannot meet the requirements in terms of degassing and dehydration. Because of the urgent need of the project, the company contacted us to order two ZYA-500 large flow two-stage vacuum oil filters that month. Our oil filter was transported to Luoyang site overnight and worked overtime to filter oil, ensuring that acetylene=0, water and gas meet the requirements; The vacuum hot oil circulation drying treatment was also carried out for the damped transformer to increase the insulation resistance of the transformer body from 1200M Ω to 4500M Ω.

500KV transformers produced by Chongqing ABB Company are sold to major substations across the country. It is found that some oil filters cannot guarantee the gas indicators when filtering oil on site. Since 2003, all 500KV transformers of the company have been filtered by our vehicle mounted ZYA two-stage vacuum oil filters on site, ensuring that acetylene=0, gas, moisture, breakdown voltage, dielectric loss and other indicators meet the requirements of ultra-high voltage transformers.

A transformer factory in Changzhou purchased an imported oil filter in 1991, and the treated transformer oil contains acetylene. In order to solve the problem of acetylene in the transformer oil, a vacuum oil filter was ordered. The manufacturer of the oil filter promised to pay a deposit of 500000 yuan to Party A. If the acetylene in the oil could not be completely removed, it would rather pay for the loss in advance. As a result, after repeated commissioning after delivery, the requirements could not be met, and the filtered oil still contained acetylene.

As a matter of necessity, the factory bought a new vacuum oil filter last year, which was used to filter oil for many times. As a result, the oil also contains acetylene; The factory also spent money on the reform of this oil filter, wasting a lot of money.

Tianwei Baobian Electric Appliance Co., Ltd

In 1998, the company purchased a VH060RS vacuum oil filter of Macphail with more than 900000 yuan. The operating noise of the machine is large, and the treated transformer oil always contains acetylene, which cannot meet the current oil filtering requirements. In order to revitalize the assets and give full play to the functions of the equipment, the company and Chongqing Qianguang Electromechanical Research Institute agreed that we would transform the oil filter. Ensure that the acetylene of transformer oil treated by the reformed oil filter is zero, and reduce the noise to 78d β following.

In December 2005, the reconstruction work was completed. The reformed oil filter completely meets the user's requirements.

Baoding Baoling Transformer Factory

A Jilin vacuum oil filter was purchased in October last year, and was commissioned in March this year. As a result, there was still acetylene in the filtered transformer oil. A vacuum pump was replaced, and there was still a large amount of acetylene after the oil was filtered.

Fuzhou Electric Co., Ltd

The company produces 220KV transformers. Last year, I bought a domestic vacuum oil filter. After more than a year of debugging and transformation, acetylene and gas did not meet the standard, even the water content did not reach 10ppm.

A transformer company in Hangzhou, Zhejiang

I have used vacuum oil filters imported from Switzerland and other manufacturers, and the use effect of these oil filters cannot ensure zero acetylene. The factory detected zero acetylene by itself, but sent a small amount of acetylene to the power department for detection, because the precise chromatographic analyzer can detect trace acetylene content.

At present, the factory has accumulated hundreds of tons of 25 # new transformer oil containing acetylene. How to dispose of this batch of transformer oil containing acetylene is a thorny problem for the factory.

The oil filter imported from Japan used by Suzhou Power Supply Bureau also found acetylene problem.

A certain transformer factory in Jinan once used two Macphail vacuum oil filters, and the treated transformer oil contains acetylene. In 2003, I bought a domestic vacuum oil filter, which also contains acetylene after oil filtering.

The oil filter of Italy was also used in Wujiang Lujiang Special Transformer Factory, and acetylene was found.

Jinan Siemens Transformer Co., Ltd. uses two ABB vacuum oil filters. After treating the transformer oil, the oil contains acetylene gas. The company is negotiating with our institute that we will transform these two ABB vacuum oil filters. Make it reach zero acetylene content in the treated transformer oil.

3、 Application example of ZYA double stage vacuum oil filter to ensure acetylene=0:

Sichuan Yibin Electric Power Bureau has installed a new 220KV transformer in Longmen Power Station. This transformer is produced by Xinjiang TBEA, and its oil load is more than 38t. After installation, check whether the oil contains acetylene; Several oil filters of Yibin Electric Power Bureau were immediately used for on-site treatment. After more than half a month of oil filtering, the transformer oil still contains acetylene.

The company rented a ZYA-200 double stage vacuum oil filter. It was transported to Longtou Power Station, and the acetylene problem was completely solved after 3 days of treatment. Oil sampling test: acetylene is 0, ethane is 0, ethylene is 0, hydrogen is 0, and total hydrocarbon is only 0.2; The micro water content is 2mg/L—— This is tested by Sichuan Electric Power Test and Research Institute.

Jiangsu Nantong Youbang Transformer Co., Ltd

In September 2003, ZYA-100 two-stage vacuum oil filter was ordered, and the oil sample was sent to Nanjing Electric Power Test and Research Institute. The test results showed that water content was 2 ppm, breakdown voltage was 73KV, acetylene=0, hydrogen=0, and gas content was 0.005%.

This machine is used to treat a transformer for high voltage test. The oil contains 46 ppm acetylene, which is zero after treatment.

Yunnan Tonghai Transformer Factory

In 2001, ZYA-150 two-stage vacuum oil filter was ordered. After the transformer oil was treated, the acetylene gas contained was zero.

Jiangsu Suzhou Antai Transformer Co., Ltd

ZYA-100 two-stage vacuum oil filter ordered last year is mainly used to remove acetylene gas from transformer. The actual use effect is remarkable, and all the transformers treated by the machine meet the acceptance standards.

Shanghai Delixi Group Power Transformer Co., Ltd

Last September, ZYA-100 double stage vacuum filter oil was ordered. Treatment of transformer oil, once circulating and filtering to achieve acetylene gas=0, hydrogen=0, breakdown voltage 70KV

Jiangsu Wuxi Special Oil Products Factory

The transformer oil produced by the factory has purchased ZYA-300 double stage vacuum oil filter because it contains unqualified acetylene gas. The transformer oil processed by the machine is sent to Suzhou Power Supply Bureau for testing, and the acetylene gas is zero, and other indicators are qualified. The factory ordered another ZYA-200 double stage vacuum oil filter last year.

Henan Mianchi Aluminum Co., Ltd

The installed oil volume of 5 # main transformer and 4 # main transformer: the acetylene and hydrogen of 63T large transformer oil seriously exceed the standard and need to be treated urgently.

There are four vacuum oil filters in the plant, but none of them can completely remove acetylene, hydrogen and total hydrocarbon from transformer oil.

The factory borrowed an oil filter produced by me, and the effect is good after use. Therefore, we bought Model 200 double stage vacuum oil filter. We sent technicians to assist the plant to deal with the insulating oil of two large transformers day and night, completely solving the problems of acetylene, hydrogen and total hydrocarbon in the oil.

The main indicators of oil quality test before and after treatment of 5 # main transformer are compared as follows (content unit: μ L/L）：

Before and after treatment

Acetylene C2H2: 0.17 0

Hydrogen H2: 5345.9 7.59

Total hydrocarbon: 400.38 2.78

Tianjin Dagang Oilfield

Order 500 type double stage vacuum oil filter, which has large flow and good purification index. 152t transformer oil is processed in 8 hours, with an average of 19t per hour. After treatment, the voltage strength reaches 78KV, and the micro water removal limit reaches 1.12ppm.

4、 Why can't many vacuum oil filters completely remove acetylene from transformer oil?

Reasons for acetylene in oil: First, the transformer oil itself contains acetylene; second, the oil is partially overheated and decomposed due to electric heating, forced filtering or friction of mechanical oil transmission system during oil filter treatment, resulting in hydrogen, acetylene, methane and other gases. The working principle of vacuum oil filter should be to separate water, gas and low distillate from oil by evaporation. Its separation capacity is related to working vacuum degree, oil temperature, oil film evaporation area and evaporation time. For each vacuum oil filter, its gas separation capacity is relatively fixed. However, due to the strong binding force of extremely small amount of water, gas and oil molecules, the separation capacity of general vacuum oil filters is limited. No matter how long the oil is filtered, when the limit equilibrium is reached, the oil still contains a small amount of gas and water, which is why many vacuum oil filters cannot completely remove acetylene.

It is normal that the transformer oil in operation contains acetylene, which is a parameter for analyzing the transformer fault state.

Acetylene in the new transformer oil is left over due to the imperfect performance of the vacuum oil filter; The excellent oil filter ensures zero acetylene.

5、 Mistakes of transformer manufacturers in purchasing oil filters

The power sector has increasingly high requirements for transformer oil. Some vacuum oil filters have low oil filtering efficiency, limited dehydration, degassing and impurity removal capacity, and their oil filtering indicators are not ideal, especially acetylene=0 However, some manufacturers did not emphasize the clause of acetylene=0 after oil filtering in the technical requirements or bidding documents when purchasing oil filters, nor did they insist on the technical requirement of unconditional return if this clause is not met. As a result, the oil filter purchased with hundreds of thousands or even millions of yuan cannot guarantee acetylene=0 If it fails to meet the technical requirements, it cannot be returned, so that some manufacturers have 5 or 6 oil filters, but none of them can fully meet the requirements, making acetylene zero.

In fact, it is very simple. When the manufacturer purchases the oil filter, as long as the performance index is adhered to and acetylene=0 is the necessary clause, it can change from passive to active to avoid the embarrassing situation of "failure to meet the technical requirements and no return".