IS200RAPAG1B
IS200RAPAG1B
IS200RAPAG1B
为什么要限制短路电流：
·限流断路器能明显地将装置中短路电流产生的不良效应减小
·降低电缆的发热，而延长电缆的寿命
·降低电动力，因而能使电气触头的变形或损坏减轻
·对邻近电路的测量设备的影响减小
·这一级联技术为下方侧的电器使用低的额定值，而使设备、外壳和设计获得很大的节约短路的两类情况
1、金属性短路：
●短路点被熔焊，短路点阻抗可以忽略不计。
●短路电流一般在线路额定电流的几百倍甚至上千倍
●通过设定保护电器的短延时和瞬动可以很好的保护线路。
2、电弧性短路
●短路点建立电弧，短路点呈现大阻抗的弧电阻。
●电弧的形成与电压无关
●故障电流很小
●保护电器不能动作或不能及时动作来切断电源
●分成两种形式：相线之间或相线和N线之间的电弧性短路；相线或N线与地之间的接地故障形成的电弧性短路。
●火灾隐患极大。
achieve ultra-long-distance communication.
Subsystems such as PLC communicate with the Industrial” system through the ModBus protocol interface. The system also supports IEC870-5 over-control protocol.
discussion.
The Flash EPROM inside the PS provides more than 220 functional modules (control algorithm subroutines), in addition to the basic ones specified in the IEC 61131 3 standard
In addition to this content, many powerful and rigorously tested function blocks from actual engineering applications have been expanded. any complex control
The scheme can be realized by the combination of these function blocks.
The function blocks provided by the system mainly include the following categories:
o
Analog processing
o
digital processing
loop regulation
Logical sequence control
c
logic operation
Monitoring function
Collection function.
c
arithmetic operations
c
TCP/IP protocol communication interface
Modbus protocol communication interface
1EC870-5 protocol communication interface (Telecontrol)
4.2 Field Controller PS
Industrial” field controller PS is a special process control station, which is embedded with field bus communication interface for users to use
Fieldbus technology offers very flexible options. Each PS allows to insert 4 fieldbus interface cards (the card type can be different),
Each card is connected to 1 field bus to collect process data and diagnostic information from the bus, the interface card is easy to replace and plug and play
(Plug & Play), and can be plugged and unplugged.
The field controller PS has the following characteristics:
o
Flexible: supports all international standard open fieldbuses and can be mixed
Simultaneous connection of 4 high-speed fieldbuses (max. 12 MBd)
Simple engineering: configuration, commissioning and diagnostics using only the same tool CBF (Control Build F) software
mouth
Access to all information from the field including equipment management information
Global database of fieldbus devices, control levels and HMI (Human Machine Interface) usage systems
Module identification with production
