TBEHCS-1 Turbine Bypass – Electro-Hydraulic … Bypass – Electro-Hydraulic Control Systems Product Data Sheet Section 6: Turbine Bypass Systems 6.1400 – 2 Total Valve Control

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Product Data SheetSection 6: Turbine Bypass Systems

www.paladonamericas.com

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IntroductionSince the 1960s, most traditional power stations have adopted LP and HP turbine bypass systems.

Turbine bypass systems allow operation of the boiler independently of the turbine during start-up, commissioning, shutdown and load change activities.

This ability to operate the boiler independently of the turbine greatly enhances operational � exibility during transient operating conditions, and ultimately:

� Reduces start-up and reloading times

� Increases equipment life

� Increases plant availability

With the effectiveness of the turbine bypass system being dependent on the speed and accuracy of the valve actuators and control systems positioning the bypass, spraywater and isolation valves; it is imperative that customers choose a manufacturer with the required experience and proven track record.

Turbine Bypass – Electro-Hydraulic Control Systems

With the effectiveness of the turbine bypass system being dependent on the speed and accuracy of the valve actuators and control systems positioning the bypass, spraywater and isolation valves; it is imperative that customers choose a manufacturer with the required experience and proven track record.


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Key Features� Compact design for arduous duty

� Customized to suit speci� cation requirements

� Operation of multiple control valves

� Dual pumping system with auto changeover

� Independent � ltration with oil cooling as required

� Direct acting zero leakage solenoid valve for proportional control with accuracy and fast response

� Failure modes to suit speci� cation requirements

� Manifold construction to eliminate pipework and increase system reliability and ruggedness

� Independent hydraulic control mounted locally or onto each valve

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Design Criteria� Motor Pump Set Dual pump sets are provided with automatic change over

capable of charging the accumulator storage station in a time suitable for the application.

� Manual Override Achieved by means of hydraulic hand pump mounted on the

HPU with manual control local at each valve.

� Accumulator Storage The HPU will be supplied with suf� cient storage as required

from the speci� cation. With certain installations it is preferable for the accumulator storage to be mounted local to the valve with the hydraulic control system. This will ensure installation pipework is kept to a minimum size.

� Filtration An independent motorised � ltration unit can be � tted to the

HPU requiring a power supply of 0.37 kw and can also be used for � lling or draining the reservoir. Being an independent unit also allows for changing the � lter element without switching off the HPU.

� Oil Cooling An air blast oil cooler can be � tted if required and necessary

within the system installed in the � ltration unit and requiring a power supply of 0.37 kw.

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Design Criteria� System Condition Monitoring with PLC Control System pressure, level and temperature can be visually

monitored on the HPU.

The control panel will be fed from the required ac supply. The control panel will have 24VDC power supply for the control circuits.

The PLC selected to control the system is a Siemens S7-1200 PLC connected to a KTP400 4” mono HMI.

The PLC control panel will provide the following functions:-

� System alarm handling and diagnostics

� Adjustment of system parameters - pressure operating settings, level and temperature trip settings

� Manual control of the motors

� Control of the HPU from pressure transmitter

� Monitoring and alarm of the HPU temperature and level transmitter

� Valve Actuator The Paladon hydraulic actuators all incorporate

the latest technology for the cylinder and yoke mechanisms. All steel construction means that these units are designed for the most extreme of operating conditions and are guaranteed to provide extended service life. Actuators for modulating service include heavy-duty bearings and seals.

� Feedback Device Micropulse transducer is integral with the actuator

for reliability and protection. The device is stainless steel with an ingress protection of IP66.

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System Architecture



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Actuator Features� ENP coated cylinders with external tie bars where applicable

� Circular apertures sealed by ‘O’ rings

� Heavy duty piston rod operating in sleeve bearings ensure no degradation of sealing surfaces due to working loads

� Actuators incorporate a central guide rod which supports the combined piston and guide pin assembly throughout the stroke cycle

� All critical nuts and bolts are positively locked

� Adjustable end stops are provided for external adjustment and locking.

� Standard operating temperatures -4°F to +176°F (-20°C to +80°C)

Typical HPU Dimensions

TBEHCS-1 Turbine Bypass – Electro-Hydraulic … Bypass – Electro-Hydraulic Control Systems Product Data Sheet Section 6: Turbine Bypass Systems 6.1400 – 2 Total Valve Control

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