English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This paper introduces a universal SF6 gas sampling interface device. When we test the SF6 gas, it was easy to choose a wrong joint or take fewer joints on spot. Due to the variety of the tested device valve, through the field usage situation, this device solves the defects of different type or manufacturer equipment sampling valves, which don't have a unified specification, and implements the standardization SF6 gas sampling interface. Introduction (1)Importance of SF6 gas testing SF6 is colorless, odorless, non-toxic and non-burning and non-burst inert gas.SF6 has arc extinguishing ability(100 times of air) ,and also has high insulation performance characteristics(two times greater than air).It is widely used currently. the SF6 electrical equipment which is in the normal operation(below 80 degrees)will not products decomposition. When partial discharge, spark and ARC discharge happened in the equipment, it will cause decomposition of SF6 gas react with other insulation materials. The different defects inside the equipment (different temperature) can cause different type of discharges, and produce different decomposition products. When the device fails and the temperature reaches the point temperature, it will produce different decomposition products[1, 2]. When SF6 gas exists in the water, it will seriously affect its insulating properties. Moisture inside the device, may be brought by the SF6 and equipment components, or because the joint is not seal, air vapor intrusion, and invasion of water will reduce the insulation characteristics of electrical equipment, also indirectly cause equipment corrosion[3]. So the detection of the decomposition and moisture content of SF6 gas can judge the type, property, and degree and development trend of equipment insulation. (2) The distribution of equipment which is be filled with SF6 gas in Fushun Power Supply Company. In recent years, with the renovation project of launching Fushun Power Supply Company 220kV GIS substation. There are 8 of 13 substations with 220kV under the jurisdiction have been successful transformed into a GIS substation, and have been successfully put into use. But only twelve substations with 66kV transformed into GIS substation, accounting for only 13.2 percent of the total. Most of the 66kV substation is open substation and circuit breakers are SF6 circuit breakers[4]. (3)Type of SF6 connector Before we test the SF6 gas, it is very important to choose the matching joint which connects the instrument and the gas chamber valve of the test equipment. Now connector manufacturers which Fushun Power Company commonly used are from many different factories, as shown in Figure 1. Because there are a lot of lines in 220kV open type substation, the number of the SF6 circuit breaker equipment is large. Furthermore, since the establishment of the substation, due to the aging equipment and insulation defects, many SF6 circuit breakers had been replaced. Resulting in many kinds of SF6 circuit breakers being used, models are not uniform. The forms of the air chamber are many and varied[5]. 4th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2016) © 2016. The authors Published by Atlantis Press 1420 Fig.1 The physical figure of joints Fig.2 Indistinguishable to the naked eye connector Problems in field test Because joints are produced by different manufacturers, the plenum valve diameter of SF6 circuit breakers has different sizes. For example, there are 14 groups SF6 circuit breakers with 220kV in Lishizhai substations. And we required three kinds of connectors. In the field test, because of the similar joint interference, we often choose joints by errors or omissions. On September 16, 2014, the working team members drove 100 kilometers outside to the substation for carrying out SF6 circuit breaker gas micro water transfer test. When the testing car arrived at the scene, the staff found that the joint and the SF6 circuit breaker gas chamber valve did not match. So we stopped the work. Eventually, because workers carried the wrong joint, the vehicle should return to change. Not only the efficiency is low, but also it wasted a lot of manpower and material resources. Since then, in order to prevent such incidents from happening again, test personnel usually need to carry all the joints (more than 40 species) when we test the SF6 gas . It is inconvenience to prepare work; test work, finishing work, and also can not meet two substations at the same time to carry out SF6 gas related tests. So the equipment utilization and work efficiency is very low. Typically, SF6 gas testing (that is, water testing, product testing, purity testing) process shown in Figure 3.

Research on Universal SF6 Gas Sampling Interface Device