About us

Shenyang Longdy Electrical Equipment Co., Ltd. was established in 2003, is specialized in auxiliary switch research and development, manufacturing, set stroke switch, micro switch research and development and manufacturing, precision mold design and manufacturing, precision stamping parts, plastic parts processing in one of the high-tech research and development, production enterprises.

PURPOSETo comply with truth · To work with morality
VISIONBuild excellent enterprises, build a hundred billion business circle, and help the northeast economy
MISSIONTo create a rich and happy life for employees, at the same time, to contribute to the development of customers and society.
SENSE OF WORTHActively love life and work, to be rigorous, honest, grateful, humble and altruistic.
Mold workshop

Mold division has advanced processing equipment and testing equipment. There are more than 100 sets of processing equipment, such as vertical machining center, CNC lathes, high-precision wire cutting, EDM, engraving machine, milling machine, grinding machine, high-speed punching machine, etc. There are more than 30 sets of testing equipment, such as coordinate measuring instrument X fluorescence coating thickness tester, salt spray testing machine, simple beam impact testing machine, 1T plastic tensile testing machine, etc., which can ensure the production and processing cycle and quality control of molds and products...

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Injection molding workshop

Shenyang Qingji Precision Molding Co., Ltd. is an independent business division of Longdy Electrical Appliances, established in 2010, specializing in the design and manufacturing of injection molds, die casting molds, rubber molds, injection products, die casting products, rubber products, mechanical processing, hardware products, stamping products production and sales. Plant construction area of 4500 square meters, more than 30 employees. Over the years, Qingji Molding has been focusing on the design, development and production of plastic mold sales, adhere to the purpose of quality, long-term for Volkswagen, Shenyang Broad, Switzerland ABB, Astak, Jinbo Johnson, South Korea Aige machinery and other well-known brand manufacturers to provide supporting molds and products...

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Assembly shop

The company has product independent research and development, design, production capabilities. Has developed, produced and assembled 27 series of auxiliary switches (FK series, FH series, FH1 series, FR series, FR1 series, FC series, FB series, FA series, S100 series, CWA series, C2 series, LXB series, LZ series, LAA series, LFZ series, LFD series, LFE series, LFF series and LFG series, etc.), more than 400 specifications. All electrical products are produced according to the national low-voltage electrical standard GB/T14048.5-2008 (equivalent to IEC60947-5-1), and have passed the type test of the National Machinery Industry low-voltage explosion-proof electrical products quality supervision and testing center or Shanghai Electrical Equipment Testing Institute....

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Electroplating workshop

Electroplating processing and manufacturing Department general description: the existing four production lines, respectively, alkaline galvanizing line, acid galvanizing line, rolling tin line, non-cyanide rolling silver line, 3 management personnel, 2 technical personnel, 27 production...

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Machine shop

The machine workshop has 4 bench drills, 4 CNC cars, 1 machine walking machine, 2 general cars, can process all kinds of machine parts, professional skills are strong, can process scattered parts and batch parts....

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Press shop

Our stamping workshop has 6 equipment, 80T one, 45T one, 25T three, 16T one, 6.3 tons one, can guarantee the quality and quantity of electronic connectors...

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PRODUCT CENTER
Business Partner
News Information
Unlocking the Secret to “Precise Detection” of Smart Substation Disconnect Switch Positions: The Core Value of Micro-switch and Electronic Current Transformer Synergy

Amid the wave of smart grid upgrades, the accuracy of disconnect switch position detection in smart substations directly impacts grid operational safety and O&M efficiency—a misjudgment of the switch’s status could lead to live-line misoperations, equipment damage, or even grid failures. The key to resolving this challenge lies in the synergy between micro-switches and electronic current transformers in determining the position of smart substation disconnect switches. Through their complementary technologies, these two components establish a monitoring system characterized by “dual safeguards and precise detection.”

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Optimization of the Travel of Micro-switches in the Operating Mechanisms of GIS Isolating Switches

GIS equipment plays a crucial role in the stable operation of power systems. Among these, isolating switches are key components, and the reliability of their operating mechanisms directly affects the safety and efficiency of the entire power grid. As core components within the isolating switch operating mechanisms, the performance of micro-switches directly influences the precision of switch operations. Therefore, optimizing the travel of the microswitch in the operating mechanism of GIS isolating switches has become a vital means of enhancing equipment reliability.

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Guide to Selecting Micro Switches for Wind Turbine Hydraulic Systems: Key Considerations and Practical Recommendations

In wind power equipment, hydraulic mechanisms are key components that ensure the stable operation of core functions such as blade pitch control and braking, while the selection of microswitches for these hydraulic mechanisms serves as the “nerve center” that guarantees precise responses from the hydraulic system. As the “signal scouts” of the hydraulic system, the selection of microswitches directly impacts the safety and reliability of wind turbine operation; therefore, mastering a scientific selection process is crucial.

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