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Zhang Q.-H.,Shanghai JiaoTong University | Tan Y.,Shanghai Tianling Switchgear Co. | Wu J.-G.,Shanghai Tianling Switchgear Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

With the subscription of Kyoto Protocol and mind improvement of the environment protection, people pay increasingly anxious to SF 6 gas applications, and its application restriction will definitely becomes the tendency of developing in electrical industry. In order to avoid of SF 6 in 40.5 kV C-GIS, a design method for gas gap and interface insulation improvement has been proposed, SF 6 replaced by low-pressure N2 as the insulation gas on the basis of lesson on SF 6 experiments in the current MV C-GIS. A 40.5 kV-1250 A 3 phase in one tank C-GIS prototype filling low pressure N 2 is developed which has the same advantages of less space occupation as SF 6 C-GIS, and the feasibility of this developing concept is validated. Source


Zhang Q.-H.,Shanghai Tianling Switchgear Co. | Tan Y.,Shanghai Tianling Switchgear Co. | Wu J.-G.,Shanghai Tianling Switchgear Co.
2011 1st International Conference on Electric Power Equipment - Switching Technology, ICEPE2011 - Proceedings | Year: 2011

With the subscription of Kyoto Protocol and mind improvement of the environment protection, people is more and more worrying about SF 6 gas applications, and its application restriction will definitely becomes the developing tendency in electrical industry. In order to avoid use of SF 6 in 40.5kV C-GIS(Cubicle-Gas Insulated Switchgear), proposed a design method for gas gap and interface insulation improvement to replace SF 6 by low-pressure N 2 as the insulation gas on basis of less or non SF 6 experiments in the current medium voltage C-GIS. Developed a 40.5kV-1250A 3 phase in one tank C-GIS prototype filling low pressure N 2, which has the same advantages of less space occupation as SF 6 C-GIS, and validates the feasibility of this developing concept. © 2011 IEEE. Source


Qian L.,Shanghai Tianling Switchgear Co. | Chen S.,Shanghai Tianling Switchgear Co.
Gaodianya Jishu/High Voltage Engineering | Year: 2014

In gas insulated Ring Main Units (RMU), replacing SF6 with environmentally friendly gas like Nitrogen and dry air while without increasing the equipment volume requires optimizing the insulation structure of RMU. Hence, we calculated the insulation characteristics of Nitrogen as well as the maximum field intensity in some typical insulation systems in Nitrogen insulated medium-voltage RMU, such as gap insulation, hybrid insulation, supporting insulators, wallbushings. Then we explored ways of reducing the electric field intensity inside Nitrogen insulated RMU. Reasonably changing the conductor shape could reduce the non-uniform factor of electric field in gas gap to 2~3. Adopting hybrid insulation could reduce the maximum electric field intensity of gas insulation by about 20%. With double isolation fracture structure and hybrid shielding insulation, the insulation level across isolating distance reached 75 kV/1 min (power frequency) and ±145 kV (lightning impulse). Optimized electrode shape and insulation configuration helped to decrease the field intensity in the area where insulation surface started to break down, and realized the insulation level of 65 kV/1 min (power frequency) and ±125 kV (lightning impulse). With specially designed electric field shielding, the concentration of electric field inside RMU was relieved, which raised the insulation level of RMU. Following the above methods, we developed 12~24 kV Nitrogen insulated RMU (400 mm in width) in compliance with the required insulation levels of IEC 62271-1 and GB 11022. This RMU passed the type tests, which proves the feasibility to use Nitrogen as insulation gas in RMUs. ©, 2014, Science Press. All right reserved. Source


Zhang Q.-H.,Shanghai Tianling Switchgear Co. | Wu J.-G.,Shanghai Tianling Switchgear Co. | Tan Y.,Shanghai Tianling Switchgear Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

The inner-cone or outer-cone bushings are always used as high voltage lead-in interface for gas insulated switchgear in insulation level tests. The high voltage lead-in devices normally includes the high voltage test cable, the epoxy casting inner-cone voltage adapter etc.. Propose a new silicone rubber insulated high voltage adapter design which is applicable of high voltage leading interface for insulation level test of various C-GIS or other gas insulated switchgear. This design has the advantages of simple structure, low manufacturing cost, convenient and fast installation, as well as it has been widely used in the application of factory routine test, delivery test and acceptation tests on site of gas insulated switchgear as the high voltage lead-in device. Source

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