Product Details
Product Description
Product Description
Brand:ANYBUS
Type:ABDT-PDP 3183203131
Origin: the United States
Warranty: 365 days
Colour: new/used
Shipping method: Courier delivery
Module of PLC, DCS, ESD system card, the card is a vibration monitoring system, steam turbine control system module, the advantages of the gas generator spare parts brand: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts
Our main products are widely used in metallurgy, petroleum, glass, aluminum manufacturing, petrochemical industry, coal mine, papermaking, printing, textile printing and dyeing, mechanical, electronic manufacturing, automobile manufacturing, plastic machinery, electric power, water conservancy, water treatment/environmental protection, boiler heating, energy, power transmission and distribution and so on.
Ratio/limiter Decoupling In most cases, the extraction turbine needs to maintain both turbine speed/load and extraction or admission pressure/flow at constant levels. Changing the position of either the HP valve or the LP valve affects both turbine speed/load and extraction or admission. If either the load on the turbine or the extraction / admission demand changes, both the HP valve position and the LP valve position must be changed to maintain speed/load and extraction/admission. There are cases when this ratioing is not desired, these cases require decoupling of one or both valve outputs. There are three decoupling options available in the 505E: decouple HP (or inlet), decouple LP (or exhaust), or decouple both HP and LP. When controlling either inlet or exhaust pressure or flow and extraction/admission pressure or flow, it is desirable to limit valve interaction when inlet or exhaust conditions are constant and only the extraction demand is changing. Inlet (HP) decoupling is typically used when controlling turbine inlet pressure and extraction or admission pressure/flow at constant levels. If the inlet pressure changes, both the HP and LP valve positions must be changed to maintain inlet and extraction/ admission. However, if inlet conditions are constant and only the extraction/admission demand changes (more or less extraction flow needed), only the LP valve will move to maintain extr/adm control. Exhaust (LP) decoupling is typically used when controlling turbine exhaust/back pressure and extraction or admission pressure/flow at constant levels. If the exhaust changes, both the HP and LP valve positions must be changed to maintain exhaust and extraction/ admission. However, if exhaust conditions are constant and only the extraction/admission demand changes (more or less extraction flow needed), only the HP valve will move to maintain extr/adm control. Decoupling both valves (HP & LP) is typically used when controlling turbine inlet pressure and turbine exhaust pressure (or for controlling two independent parameters related to the turbine/process).
If the inlet pressure changes and exhaust conditions are constant, only the HP valve position must be changed. Likewise, if exhaust pressure changes and inlet conditions are constant, only the LP valve position must be changed. HP and LP Valve Limiters The HP and LP valve limiters limit the HP and LP valves to aid in starting and shutting down the turbine. The limiters are adjusted through the keypad, external contact closures, or Modbus commands. When raise or lower commands are received the limiters move up or down, respectively, at the programmed rate. The output of the HP valve limiter is low-signal selected with the output of the ratio/ limiter. The lowest signal will control the HP valve position, thus the HP valve limiter limits the maximum HP valve position. The output of the LP valve limiter is high-signal selected with the output of the ratio/ limiter when configured for extraction steam turbines, and low-signal selected when configured for admission or extraction/admission steam turbines, thus the LP valve limiter limits the minimum or maximum LP valve position depending on the configuration selected.
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