Compact Secondary Substation for Tunnel & Underground Projects

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Weatherproof Compact Substation for Outdoor Site Deployment

Backed by strong technical capabilities and a strict quality management system, we have earned the trust of major enterprises such as China National Petroleum Corporation (CNPC) and COSCO Shipping, and have participated in several national key engineering projects. All our products are CE certified and exported to the United States, Southeast Asia, India, the Middle East, and many other regions, receiving widespread recognition.
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Advantages of compact secondary substation

Apex Technologies firmly believes that trust and professionalism are the foundation of successful partnerships. We empower our clients with strong support to help them win more projects and orders.

Competitive Pricing

We offer highly competitive prices while ensuring the highest product quality.

Quick Response

With extensive experience in global collaboration, our team responds promptly to your needs — saving time and achieving mutual success.

Balance in Life and Work

We advocate “Live seriously, work happily.” We believe a team with a positive attitude toward life can serve you with greater creativity and passion.

Compact Substation for Tunnel and Underground Engineering

Mining Explosion-proof Transformers VIEW DETAILS

Mining Explosion-proof Transformers

High-performance Rectifier & Phase-shifting Transformers VIEW DETAILS

High-performance Rectifier & Phase-shifting Transformers

High-voltage Switchgear VIEW DETAILS

High-voltage Switchgear

Photovoltaic (PV) Step-up Transformers VIEW DETAILS

Photovoltaic (PV) Step-up Transformers

High insulation and flame retardant compact substation with integrated safety protection. Compact footprint saves space, widely applied for industrial parks, manufacturing zones and factory centralized power supply.

Frequently Asked Questions (FAQ)

Q:What are the special selection requirements for transformers that are matched？

A:It features low loss and low noise; the short-circuit impedance needs to match the inverter; it has strong resistance to voltage fluctuations and harmonic impacts; the transformer for photovoltaic power stations needs to adapt to significant changes in load throughout the day and night; the transformer for wind power needs to be able to withstand outdoor high-altitude and low-temperature environments, with a protection level of no less than IP54.
A:Our product portfolio includes oil-immersed transformers (S11, S13, SZ11, SZ13, SFZ11, SFZ13), dry-type transformers (SCB, SG), special transformers, prefabricated substations (ZGS, YBM, XBF), amorphous alloy transformers (SBH), new energy transformers, high and low-voltage switchgear (XGW, DFP, MNS, GGD), and various accessories.
A:Reasons: Loosening of core, deformation of windings, resonance of components, failure of cooling system, influence of grid harmonics. Measures: Tighten the core clamps; Correct the position of windings; Adjust the shock absorption devices of cooling fans / oil pumps; Install soundproof covers; Address grid harmonics.
A:The box-type transformer is suitable for urban residential communities. It has a high degree of integration, occupies a small area, has a clean appearance and low operating noise. It can be directly placed in the green belts or power distribution rooms of the community. The pole-mounted transformer (tower-type transformer) is suitable for suburban or rural communities. It has a low cost and is easy to install. It is erected on utility poles and is suitable for scenarios with dispersed loads.

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