Abstract: Introduced the ELK-04-type SF6 gas-insulated metal-enclosed switchgear in Zhuhai PTA110kV Transformer substation Engineering applications, design, installation and commissioning process of experience and practice should be aware of some problems. |
Keywords: SF6 gas insulated switchgear; building block structure; module design; engineering applications SF6 Gas insulated switchgear (GIS) take up less space, Cloth Purchase compact, high reliability. In Electricity Load concentrated in areas that require high reliability it is economical, good overall efficiency technology options. GIS ELK-04 type is ABBCalorEmagSchaltanlagenAG German factory rated voltage 145kV, maximum operating voltage of 170kV, 110kV voltage applied to China's level of SF6 gas-insulated metal-enclosed switchgear. GIS ELK-04 type is the most mature technology company ABB one of the products, high reliability, since 1969 has been the experience of thousands of long-running interval. Since starting in December 1999 by ABB Xiamen Huadian High pressure Switch Co., Ltd. in the domestic assembly and manufacture, commissioning and testing. Zhuhai PTA110kV substation project, according to project conditions and circumstances of the actual use of such equipment.
1 Project Overview Substation is located in Zhuhai City, Guangdong Province PTA110kV Western Ohira Bay Road, Zhuhai City, Zhuhai City, to the Bi Yang Chemical Co., a major electricity substation users. The substation 110kV overhead lines through two back access network. 110kV double bus terminals. The first phase installation of 3 sets of 110kV double-winding Transformer , 9 sets aside a further expansion of 110kV double-stage transformer winding possibilities. Could eventually reach 2 back into the 110kV line, and 12 pairs of the main transformer winding construction scale. Main Transformer Low Side and chemical plants and high voltage substation area 6kV motor connections, power supply to the plant load.
2 110kV power distribution unit of design ideas Due to the chemical plant of the importance of high reliability requirements; while a larger number of the substation outlet circuit, which uses a pair of bus terminals. 110kV SF6 gas insulated power distribution devices used metal-enclosed switchgear, the house layout. Current projects of construction of six intervals, from a fixed-ended extension of side order of mother of the interval (a), line outlet spacing (2), transformer outlet interval (3). Line and transformer outlet outlet spacing intervals are Cable And outlet. The last interval of the bus leaves gas isolation section and the expansion joint connector insulators, with closed end caps closed for expansion along this direction, the extension of the process of reducing the impact on the operation to a minimum.
ELK-04-based GIS are the main technical parameters: Rated voltage 145kV, rated current 2500A, rated short-circuit breaking current of 40kA, rated short time withstand current 40kA (3s), rated peak withstand current 100kA.
The 110kV switch house inside the layout, taking into account the turning radius of large 110kV cable, the mass of unit length, construction pull, and other factors, will be installed in the GIS layer, a layer reserved for cable layer, so that cable convenience outlet. GIS standards for each interval spacing 1200mm, 110kV Cable outlet holes on the required width of the floor is not less than 700mm, civil engineering design of the beam width should be limited to within 500mm, and the location of escape cable hole. When the local control cabinet close to the bus arrangement, the interval of vertical length 4600mm, in considering a reasonable distance of work space and maintenance, the wish to ensure the clear distance between walls is greater than 9000mm. This easy to run the operation, installation and maintenance at the same time, the larger equipment such as SF6 gas collection devices, high voltage test equipment, etc., can be flexible Mobile And layout.
3ELK-04-type structure and technical characteristics of GIS 3.1ELK-04-based GIS for the phase of tube type structure Bus, Breaker Isolation / grounding combined switch, speed grounding switches, current transformers, voltage transformers, etc. are all enclosed in the same three-phase cylindrical container. Arrangement of compact material savings.
3.2 shell Aluminum Alloy materials, casting molding Corrosion-resistant aluminum alloy, high strength, can adapt to different environmental conditions. And Steel Material compared to only one-third of the density and quality greatly reduced. Reduce the number of lifting capacity, easy installation and maintenance and overhaul; on the role of foundation and floor load is small, can reduce investment in civil engineering. More importantly, aluminum non-iron Magnetic Materials , Can effectively prevent the induction current generation, will not lead to device heating hysteresis loss situation. GIS in various parts Flange Used to connect Bolt Should also be used non-ferrous magnetic Stainless steel Bolts, rather than using bolts replaced.
3.3 building block structure of the module design Flange specifications of each module can be freely combined all the same, standardized modules simplify equipment design, easy and flexible configuration, installation and shorten the construction cycle. The main modules are as follows.
(1) circuit breaker. Single fracture, self interrupter type, breaking ability, energy and small circuit breaker operation. Circuit Breaker Selection HMB-1 type Spring Storage hydraulic operation, small size and high reliability. Can whole removal, replacement and maintenance easy. Breaker reliability, long operation time, the number of circuit breaker maintenance-free operation are: breaking rated current 10000; 31.5kA short-circuit breaking current of 30 times; breaking 40kA short circuit current 20 times.
(2) Isolation / ground combination switch. Is both Isolating switch And ground switching feature a combination of switch, there are three working positions: isolation switch connected position, off position, grounding switch connected location. Isolation / grounding switch combinations can each have a rotating phase Knife Shaped contact, and two static ports: isolation switch and earthing switch contact static static contact. With position indicator of the electric actuator through the oblique Gear And insulated shaft-driven blades for rotation to select the work location of the contact. As the only location in 3 working among one, essentially the same position to prevent the grounding switch is charged when closing misuse.
(3) speed grounding switch. Operating mechanism for electric energy storage spring mechanism. It can be installed on the outlet side of the line as the line side of the grounding switch can also be installed on the bus as a bus ground switch. The rated short-circuit fault short circuit current of Closing 100kA (peak), it can operate maintenance-free 2.
(4) Current transformer and voltage transformer. Stand-alone current transformer and circuit
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