LSD50/200CType Solid-State Decoupler
I. Overview
As the use of cathodic protection technology for buried steel pipelines becomes more widespread, the stability of the cathodic protection systems is also a major concern. However, in real production and daily life, electromagnetic interference is omnipresent, and its impact on the cathodic protection systems for pipelines is also significant. Instances of electromagnetic interference causing the failure of cathodic protection functions, accelerating corrosion, and damaging impressed current equipment are not uncommon. Therefore, addressing interference issues has become one of the crucial problems in cathodic protection systems. The commonly adopted method to solve electromagnetic interference is to install drainage devices on the pipeline, which can effectively resolve the interference and maintain the pipeline potential at a reliable level. Nevertheless, existing drainage devices also have certain limitations, such as their inability to withstand strong energy disturbances like direct lightning currents and induced lightning currents.Solid-state decouplers effectively address fault grounding short-circuit currents in high-voltage lines, grounding currents introduced from lightning strikes on overhead transmission lines, and stray currents generated when trains pass over railway tracks. This product protects against overvoltage or overcurrent caused by the aforementioned situations, preventing pipeline cathodic protection from being affected and safeguarding against increased corrosion due to electromagnetic interference, providing effective protection for pipeline equipment.
Section II: Reference Standards
IEC61643.1-2005Surge Protectors for Low-Voltage Power Distribution Systems No Chinese content provided.1"Performance Requirements and Testing Methods"
NACE RP0177"Measures to Mitigate the Impact of Alternating Current and Lightning on Metal Structures and Corrosion Control Systems"
GB18802.1-2002/IEC61643-1Surge Protectors for Low-Voltage Distribution SystemsSPD) 1st1"Performance Requirements and Testing Methods"
GB/T19271.1"Part of Protection against Lightning and Electromagnetic Pulses: General Rules"
GB50057"Code for Lightning Protection Design of Buildings"
GB50251"Regulations for Gas Pipeline Engineering Design"
GB50253"Design Specifications for Oil Pipeline Engineering"
GB4208IP Rating Protection ClassIPNo Chinese content provided.
GB/T2423"Environmental Testing for Electrical and Electronic Products"
SY/T0032-2000 "Underground Steel Pipe Exchange and Drainage Protection Technical Standard"
Section Three: Decoupler Dimensional Drawing
Four: Performance Parameters
Serial Number | Project | Technical Specifications |
1 | Direct Current Starting Voltage(1mA) | -2.0V/+2.0V |
2 | AC/DC Current Drain Rated Value | 45A |
3 | Rated Discharge Current | 100kA（8/20μs） |
4 | High-discharge current | 200kA（8/20μs） |
5 | Leakage Current | ≤10μA |
6 | Communication Impedance | <0.01Ω |
7 | Breakthrough Conduction Voltage | ≤2200V（1.2/50μs） |
8 | Fault Current | （AC-rms/Industrial Frequency/30Zhou Bo≥3500A |
9 | Response Time | ≤1ns |
10 | Operating Temperature | -45℃～+60℃ |
V. Technical Specifications
Installation Type and Location | Buried/Surface | |
Chassis Dimensions | 200×300×150mm | |
Bracket dimensions | Φ90×2200 mm | |
Explosion-Proof Type | Body explosion-proof | |
Shell Protection Grade | IP65 | |
Shell Material | Cast Aluminum | |
Coating Protection | Powder Coating | |
Internal Structure Three-Proof | Moisture-proof, salt fog-proof, and anti-bacterial | |
Internal high current connection cable | AGG-10kVSilicone High-Voltage Cable | |
Voltage Grade | 10kV | |
Insulation coating | Insulation Resistance ≥100MΩ | |
Single-core multi-strand copper conductors | 25mm² | |
Section 6: Installation Dimensions
Seven: Contact Methods
Section 8: Installation Instructions
1Attach one end of the product to the pipeline and the other end to the grounding grid. The grounding resistance value of the grounding grid should be controlled at4Within Ohm.
2This product can be equipped with an explosion-proof box structure and installed directly in an explosion-proof environment.
3This product features a sealed structure, making it suitable for installation in humid environments.
Nine: Maintain
This product is maintenance-free; however, an increase in direct lightning strikes or other high-current impacts (exceeding)15(Paragraph), there is a possibility of product deterioration, which means the product may be damaged and cease to function. The product should be regularly opened to check the resistance at both ends of the product's wiring terminals. If the resistance is at the ohm level, the product should be promptly repaired or replaced.
