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Wang L.-M.,Shenyang University of Technology | Shi J.-L.,Shenyang University of Technology | Xu C.-L.,New Northeast Electrical Group High Voltage Switchgear Co.
Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology | Year: 2013

In order to avoid the influence of load disturbance and parameter change in the servo system of permanent-magnet linear synchronous motor for numerical control (NC) machine tool with high precision on the performances of the system, the H∞ robust control theory and loop transfer recovery (LTR) technique were combined, and an observer-based H∞/LTR synthetic control method was proposed. The target loop design was carried out for the system. Namely, under the assumption that the states of the system were completely available for detection, a robust H∞ control law was designed to satisfy the performance requirements of the system. The design for the recovery process of the system was performed, namely, the transfer function of target loop was recovered through introducing the designed observer into the system. The simulated results show that the designed controller has good performance, and exhibits strong inhibition effect for the model uncertainty and external disturbance.


Zhang H.,New Northeast Electrical Group High Voltage Switchgear Co. | Gao Z.,Shenyang Han king Precise Bearing Ltd Company | Dong Y.,New Northeast Electrical Group High Voltage Switchgear Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

Based on CAE, solidification and filling process of aluminum alloy high-voltage switch housing were simulated. Through the analysis of temperature field and casting defects in the aluminum alloy housing during the solidification process, process was optimized. The results show that the aluminum metal alloy housing can eliminate the shrinkage porosity (holes) through adding feeding channel in the sand core for partial thick-wall position to realize the sequential solidification.


Zhang H.,New Northeast Electrical Group High Voltage Switchgear Co. | Wu H.,Shenyang Research Institute of Foundry
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

To improve low pressure casting process for producing pressure-resistant aluminum alloy housing for high voltage switch, core-heart pouring with metallic mould sand core was adopted. Numerical simulation was conducted, and practical production obtained successful effects.


Zhang M.,New Northeast Electrical Group High Voltage Switchgear Co. | Yang Z.,New Northeast Electrical Group High Voltage Switchgear Co. | Meng D.,New Northeast Electrical Group High Voltage Switchgear Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2016

When the high-voltage switchgears made in China are exported to some regions and countries where the rated frequency is 60 Hz, these products need to satisfy the requirements of type tests at rated frequency of 60 Hz. Although the relevant IEC standards specify the requirements and methods for type test of the switchgears performed at 50 Hz and 60 Hz and STL guides also further specify the requirements in specific tests, the authors sum up the type test items in detail by studying relevant standards in order to confirm them performed at 50 Hz and 60 Hz easily. The authors also analyse the feasibility for some test factors of high-voltage switchgears performed type tests at 50 Hz and 60 Hz. Results show that, except for temperature-rise tests, test duties T60, T100s(T100s(b)), T100a, short-line fault tests and capacitive current switching tests, other type tests can be performed at 50 Hz or 60 Hz. So this can save plenty of testing time and money for switchgear manufactures. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.


Cui H.,New Northeast Electrical Group High Voltage Switchgear Co. | Chen G.,New Northeast Electrical Group High Voltage Switchgear Co. | Liu T.,New Northeast Electrical Group High Voltage Switchgear Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

The manufacturing level of 252 kV SF6 gas insulated metal enclosed switchgear (GIS) all over the world is reviewed in this paper, especially a GIS with rated voltage of 252 kV, rated current of 4000 A and rated breaking current of 50 kA is introduced. The structure of the GIS is of three-pole circuit within one enclosure except the circuit breaker and the current transformer. The design, configuration and type test are introduced.

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