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產品詳情資料

接地及接地系統的安裝

DCS系統對接地要求較高，一般分為：

• 本質接地

• 系統直流工作接地

• 交流電源的保護接地

• 保護接地等

各類接地系統、各接地母線之間彼此絕緣。

各接地系統檢查無混線后方能與各自母線和接地極相連。

系統直流工作接地要求高，不同家系統要求不同，阻值一般不能超過1Ω，因此打接地極。

其他系統接地要求為接地電阻小于4Ω。

保護接地可以與全廠系統地網相連。

接線

1、 硬件設備之間的連接

這種連接在控制室內部進行，大多采用多芯屏蔽雙絞線或同軸電纜，用標準化的插件插接。

這些電纜稱為系統電纜，種類多，所以工作時要仔細、謹慎，不能插錯，并做好檢查工作。

2、 DCS系統和在線儀表的連接

這是控制室與現場儀表的連接，量大點多，一般會有兩種形式：

l  一根電纜從頭到底，也就是現場儀表或執行機構的兩芯電纜直接連到控制室DCS系統相應的模件接線端子；

l  控制室通過多芯主電纜連接到現場點集中的地方，通過接線盒再分別用兩芯電纜與每個現場儀表或執行機構連接。

由于接線點數較多，每個點準確無誤，牢固可靠，排列整齊、美觀。

英文產品詳細信息

Grounding and installation of Earthing system

The grounding requirements for DCS systems are relatively high, generally divided into:

Intrinsic safety grounding

System DC working grounding

Protective grounding of AC power supply

Safety protection grounding, etc

All kinds of Earthing system and grounding buses are insulated from each other.

Each Earthing system can be connected to its own bus and grounding electrode only after no mixed wires are checked.

The DC working grounding requirements of the system are the highest, and different systems have different requirements. The resistance value generally cannot exceed 1 Ω, so a grounding electrode must be installed.

The grounding requirement for other systems is that the grounding resistance is less than 4 Ω.

The safety protection grounding can be connected to the grounding network of the entire plant system.

connection

1. Connection between hardware devices

This type of connection is carried out inside the control room, mostly using multi-core shielded twisted pair or coaxial cables, with standardized plug-in connections.

These cables are called system cables and have a variety of types, so when working, it is necessary to be careful and cautious, never plug them in incorrectly, and do a good job of inspection.

2. Connection between DCS system and online instruments

This is the connection between the control room and on-site instruments, which has a large quantity and usually comes in two forms:

A cable is connected from the beginning to the bottom, that is, the two core cable of the on-site instrument or actuator is directly connected to the corresponding module wiring terminal of the DCS system in the control room;

The control room is connected to a centralized location on site through a multi-core main cable, and then connected to each on-site instrument or actuator through a junction box using two core cables.

Due to the large number of wiring points, each point must be accurate, firm, reliable, neatly arranged, and aesthetically pleasing.

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