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About Our Company

Shanghai Longyin Elec&Tech Co., Ltd. is located in Shanghai, China's economic and financial center, and focuses on the power quality and voltage stabilization power supply industry. Provide complete power quality and power supply solutions for global customers. The company mainly provides active power filters (APF), static VAR generators (SVG), static VAR compensators (STATCOM), capacitors, voltage stabilizers, power supplies, transformers, reactors, and other products. The company has skilled technical strength and can accept commissions to design and produce the required products according to the requirements of different users. Tailor-made non-standard power quality and power supply products to meet the power supply environment, and the skilled technical team designs exclusive power supply and distribution system solutions for customers.

Why Choose Us

We focus on power quality and voltage stabilization power supply industry. Provide complete power quality and power supply solutions for global customers.

Superior Quality & Performance

- We offer better durability, efficiency, functionality products
- High-quality materials and advanced technology make products more reliable.
Competitive Pricing & Value

- Affordable pricing without compromising on quality.
- Discounts, bundles, or loyalty programs that enhance perceived value.
Unique Features and Innovation

- Cutting-edge technology, exclusive designs, customization options.
- Solving a specific problem better than competitors.
Excellent Customer Service & Support

- Responsive support, easy returns, warranties, after-sales service.
- A seamless buying experience (user-friendly website, fast shipping, etc.).

OEM/ODM Service

We have skilled technical strength and can accept commissions to design and produce the required products according to the requirements of different users. Tailor-made non-standard power quality and power supply products to meet the power supply environment, and the skilled technical team designs exclusive power supply and distribution system solutions for customers.

OEM Service

Transformers, reactors, filters, non-standard iron products, and production according to drawings, We provide various OEM services.

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ODM Service

Transformers, reactors, filters, non-standard iron products, and production according to drawings, We provide various ODM services.

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Confirmation
Customization

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Application Areas

Our products are widely used in power supply places where the reactive power changes rapidly and the voltage, reactive power, harmonics, and power factor need to be comprehensively managed. They have excellent performance in improving system power factor, stabilizing grid voltage, reducing system loss, increasing transmission capacity, reducing harmonics, reducing floor space and response speed, and are widely used in many fields.

Urban Secondary Substation
Regional Power Grid
Solar Power Station
Wind Farm
Rolling Mill
Electric Locomotive

What Our Customers Said

You are welcome to cooperate with us, Join us and come to win-win!

Caleb, German Customer

As an automotive parts manufacturer, voltage fluctuations used to cause us to lose tens of thousands of euros per month. After installing your reactive power compensation system and voltage stabilizer, the production line efficiency increased by 18% and electricity costs decreased by 22%. The equipment has been running for three years without any failures, and German engineers praised the precision of this solution. We will recommend this brand to all European industrial partners!

Grace, UAE Customer

Dubai's extreme climate is a severe test for the mall's power system. Your company's dry-type transformers and smart filters not only withstood the 50°C high-temperature test but also reduced harmonic distortion from 25% to less than 3%. The most surprising thing is the remote monitoring system, which allows us to grasp the status of the entire power supply network on our mobile phones. This is a standard solution for commercial projects in the Middle East.

Ethan, Australian Customer

Our 50MW solar power station used to trip frequently due to harmonic resonance. The reactor kit customized and developed by your technical team completely solved this problem, and the system availability jumped from 83% to 98.6%! Moreover, the IEEE standard test report you provided helped us pass the Australian power grid certification. I am looking forward to working with you again on energy storage projects.

Ava, USA Customer

Hospital MRI equipment and life support systems have extremely stringent requirements for power quality. Your medical-grade voltage regulator and active filter combination solution controls voltage fluctuation within ±0.5% and THD < 1.2%. UL-certified products and 24/7 emergency response services have enabled us to pass JCI international medical certification. This is true life-saving technology!

Hope, Singapore Customer

When our Tier IV data center encountered 5th harmonic interference, your engineers completed the entire process from on-site diagnosis to filter installation in just 72 hours. The PUE value was optimized from 1.62 to 1.48, saving more than $280,000 in electricity costs each year. This response speed and professional technology completely surpassed the service experience of traditional suppliers such as ABB and Schneider.

Latest News

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Jun 15, 2025

CHINA Power Industry Market Overview (2024)

China has the world's largest power system , with rapid growth in renewable energy, grid modernization, and electrici...

Jun 12, 2025

Advantages Of Dry-Type Transformers

Dry-type transformers (also called cast-resin or air-cooled transformers ) use air instead of oil for insulation and ...

Jun 10, 2025

Key Advantages Of SVG Over SVC

When comparing SVG (Static Var Generator) and SVC (Static Var Compensator) , SVG is generally considered superior in ...

Jun 07, 2025

Key Functions Of A Voltage Regulator

A voltage regulator is an electronic device or circuit that maintains a constant voltage level, regardless of changes...