Model Code: KIGSSD
I. Overview
With the more and more extensive use of cathodic protection technology for buried steel pipelines, the stability of the cathodic protection system has also attracted much attention.
However, electromagnetic interference is ubiquitous in real production life, and the influence of electromagnetic interference on pipeline cathodic protection system also exists. Because electromagnetic interference causes cathodic protection function failure, accelerated corrosion, damage to the applied current equipment cases are common, so the solution to the interference problem has become one of the very important issues in the cathodic protection system.
Usually, the solution of electromagnetic interference is to install discharge device on the pipeline, which can effectively solve the electromagnetic interference problem and limit the pipeline potential to a reliable level. However, there are some problems with the existing current discharge device, for example, it can only tolerate electromagnetic interference with a relatively small amplitude, and it cannot solve the interference of strong energy such as direct lightning current and induced lightning current.
Solid state decoupler can well solve the high voltage line fault ground short-circuit current, high voltage line on the upper end of the lightning line by lightning introduction of ground current, train through the railroad when the stray current. This product can protect the over-voltage or over-current generated by the above situations on the cathodic protection of pipelines, prevent pipelines from electromagnetic interference and aggravate corrosion, and play an effective role in protecting pipeline equipment.
II. Cited standards
·IEC61643.1-2005
“Surge Protectors for Connection to Low Voltage Distribution Systems Part 1: Performance Requirements and Test Methods”
·NACE RP0177
“Measures to mitigate the effects of alternating current and lightning on metal structures and corrosion control systems”
·GB18802.1-2011/IEC61643-1
"Surge Protectors (SPD) for Low Voltage Distribution Systems Part 1: Performance Requirements
and Test Methods".
·GB/T19271.1
"Protection against Lightning Electromagnetic Pulse (EMP) Part 1: General Principles".
·GB50057 Lightning Protection Design Code for Buildings
·GB50251 “Gas Transmission Pipeline Engineering Design Code”
·GB50253 “Design Code for Oil Pipeline Engineering”
·GB4208 “Case Protection Level (IP Code)”
·GB/T2423 “Environmental Tests for Electrical and Electronic Products”
·SY/T0032-2000 “Technical Standard for AC Discharge Protection of Buried Steel Pipelines”
III.Performance Parameters
No. | Item | Technical parameters |
1 | Rated isolation voltage Un | -2.0V/+2.0V |
2 | Lower leakage current Un | ≤10mA |
3 | Lower leakage current Un 0.75 times | ≤1mA |
4 | Rated lightning impact current capacity (8/20μs) | 100kA |
5 | AC fault current | ≥3500A |
6 | AC impedance | ＜10mΩ |
7 | Steady state AC current rating | ≤45A |
8 | Operating Temperature | -45℃～+60℃ |
IV. Technical specifications
Installation form and position | Buried/surface | |
Box size | 400*300*180mm | |
Bracket size | Φ88.9×221.4 mm | |
Explosion-proof type | Body explosion-proof | |
Shell protection grade | ≥IP65 | |
Shell anti-corrosion | Plastic spraying | |
Internal structure three-proof | Moisture-proof, salt spray-proof, bacteria-proof | |
Internal high current connection cable | AGG-10kV Silicone Rubber High Voltage Cable | |
Voltage class | 10kV | |
Insulation | Insulation resistance ≥100MΩ | |
Single-core multi-stranded stranded copper conductor | 25mm² | |
V. Installation instructions
1、Connect one end of the product to the pipeline and one end to the grounding network,
and the grounding resistance value of the grounding network should be controlled within 4 ohms.
2、This product can be installed in explosion-proof environment by adopting explosion-proof
box structure.
3、This product adopts sealed structure and can be installed in wet place.
VI. Maintenance
This product is a maintenance-free product, but in the event of direct lightning and other strong current impacts increase in the number of times (more than 15 times), the product will have the possibility of deterioration, deterioration that is, the product is damaged and out of action.
The product should be opened periodically to check the resistance of the product terminals at both ends, if the resistance value of the ohm level, the product should be overhauled or replaced in a timely manner.
