Products and Services Engineering Technical Service SeriesPolarized Drainage Device

Polarized Drainage Device

The Polarized Drainage Device is a solid-state drainage equipment dedicated to mitigating severe stray current interference on buried steel pipelines. It is specially designed for high-current interference scenarios such as high-voltage transmission lines and electrified railways.<br>Adopting a multi-stage parallel circuit and copper busbar heat dissipation structure, the product integrates DC decoupling, AC earthing and lightning protection functions. It features fault short-circuit protection, super high current carrying capacity and low residual voltage. As a replacement for conventional solid-state decouplers, it can effectively eliminate accelerated pipeline corrosion caused by stray currents and ensure stable operation of the cathodic protection system.

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Core Functions

Precise Stray Current Drainage

Effectively control the cathodic protection potential of pipelines, rapidly divert stray currents generated during the operation of high-voltage transmission lines and electrified railways to the ground, and mitigate metal corrosion caused by stray current interference.

Precise Stray Current Drainage
AC & DC Decoupling Earthing

It achieves DC isolation and continuous AC earthing simultaneously, ensures the effectiveness of the cathodic protection system and avoids risks of ground potential counterattack.

AC & DC Decoupling Earthing
Lightning & Fault Protection

Integrated with spark gap lightning protection structure, it can withstand lightning impulse current and fault short-circuit current to protect the safety of pipelines and equipment.

Lightning & Fault Protection

Product Features

Super High Current Withstand Capacity

Its rated levels for AC steady-state current, DC steady-state current, fault current and lightning impulse current are significantly higher than those of conventional decouplers, making it suitable for high-voltage scenarios with severe interference.
Fail-Safe Protection

Built-in independent fail-safe mechanism. It automatically short-circuits under overload or fault conditions to maintain an effective earthing path and eliminate equipment damage and potential safety hazards.
Customized Adaptation for Severe Interference

Voltage combinations can be customized according to stray current types and grounding electrode materials. The multi-stage parallel structure delivers excellent heat dissipation and ensures long-term stable operation.

Product Certification

The product has passed tests conducted by authoritative institutions including CNPC & Sinopec Cathodic Protection Testing Center and electrical equipment testing organizations for power industry. It complies with standards such as GB/T 21448 and SY/T 0017, and is applicable to severe-interference projects in oil & gas, power and railway industries.

Construction Instructions

1. Installation Preparation: Inspect appearance, sealing condition and electrical parameters; prepare brackets, copper busbars and fixing bolts.

2. Bracket Fixing: Horizontally mount the bracket outdoors to ensure firm installation and wind resistance.

3. Equipment Mounting: Securely install the drainage device on the bracket and fasten bolts to prevent loosening.

4. Electrical Connection: Connect the positive terminal to the pipeline and the negative terminal to the grounding electrode. Ensure reliable connection of copper busbars for good electrical conductivity.

5. Inspection and Commissioning: Carry out continuity and insulation resistance tests; verify drainage performance by simulating interference conditions.

6.Sealing Protection: Seal all interfaces for waterproofing; implement rainproof and sunshade protection for outdoor installation.

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Manager Xiang Mobile: 13590324600 Email: xianggw@cygct.com

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