站場陽極地床的布置Layout of anode ground bed in the station

站場陽極地床的布置
1、站場管道較好架空安裝，不與土壤相接觸。
2、站場內接地較要通過通交隔直裝置與工藝管網連接(如等電位連接器、直流去耦合器、極性排流器等)。
3、建議站場區域保護采用分布式陽極或線性陽極。陽極要安裝在接地較對面，盡量遠離接地較。深井陽極電流分布均勻，影響范圍大，但保護效果有時不好，經常會對站外管道產生陰極干擾。
4、當接地較與管網直連時，由于接地較對陰極保護電流的屏蔽，大部分陰極保護電流會經過接地較到達管道再回到電源負極，導致埋地管道欠保護。當接地較與管道隔離時，注意陰極保護電流對接地較引起的雜散電流干擾腐蝕。
5、影響陰極保護電流分布的因素是陽極地床位置，與陰極匯流點位置無關，陰極線可以在恒電位儀附近與管道連接，陰極線*延伸到被保護區域。
6、站內設施已經相互連通(管道自身連通或通過接地網連通)時，為等勢體，*跨接線(除非懷疑個別法蘭接觸電阻太大)。
7、站場內可以用犧牲陽極替代接地較，也可以用外加電流輔助陽極兼作接地較。用輔助陽極兼作接地較時，陽極之間用電纜連接，與工藝設備之間安裝避雷器或其他高壓導通裝置。
8、陰極線和零位線可以在站內任何位置與站內管道連接，不一定非要連接到地床位置。
layout of anode ground bed in the station
1. the pipeline in the station should be installed overhead and not in contact with the soil.
2. the grounding electrode in the station shall be connected to the process pipe network through the ac / dc isolation device (such as equipotential connector, dc decoupler, polarity drain, etc.).
3. it is recommended to adopt distributed anode or linear anode for station area protection. the anode shall be installed opposite to the grounding electrode and away from the grounding electrode as far as possible. the anode current in deep wells is evenly distributed and has a wide range of influence, but sometimes the protection effect is not good, often causing cathodic interference to pipelines outside the station.
4. when the grounding electrode is directly connected to the pipe network, due to the shielding of the grounding electrode to the cathodic protection current, most of the cathodic protection current will reach the pipeline through the grounding electrode and then return to the negative electrode of the power supply, resulting in underprotection of the buried pipeline. when the grounding electrode is isolated from the pipeline, pay attention to the stray current interference corrosion caused by the cathodic protection current to the grounding electrode.
5. the factor affecting the current distribution of cathodic protection is the anode ground bed position, which has nothing to do with the cathode confluence point position. the cathode line can be connected to the pipeline near the potentiostat, and the cathode line does not need to extend to the protected area.
6. when the facilities in the station are connected with each other (the pipeline itself or through the grounding grid), they are equipotential bodies and do not need jumper wires (unless it is suspected that the contact resistance of individual flanges is too large).
7. in the station, sacrificial anode can be used to replace the grounding electrode, or impressed current auxiliary anode can also be used as the grounding electrode. when the auxiliary anode is used as the grounding electrode, the anodes shall be connected with cables, and lightning arresters or other high-voltage conduction devices shall be installed between the anodes and the process equipment.
8. the cathode line and the zero line can be connected to the pipeline in the station at any position in the station, not necessarily to the ground bed.
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