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RELIABLE AND INNOVATIVE MONITORING OF ACCU-MULATOR SYSTEMS IN THE HYDROPOWER INDUSTRY

These accumulator solutions for the hydropower industry focus on safety-related components. It is vital that electromechanical component manufacturers and hydropower plant operators pay

special attention to these solutions. When a functioning bladder or pis-ton accumulator system is supported by the right monitoring system, shut-off valves (butterfly valves, ball valves or cone valves) and turbines (guide vanes, nozzles, deflectors, runners) can be closed reliably and safely using accumulator energy.

PRODUCTSAs a system supplier, HYDAC offers fully assembled piston accumula-tor and bladder accumulator stations as well as accumulator compo-nents. These stations are supplied ready for operation and are tailored to the application and size of the hydropower plant. Hydraulic power units for turbine control and the associated servomotors are also availa-ble from HYDAC.The main advantage of the piston accumulator is that there are a range of piston position monitoring options available. These enable the accu-mulator to fulfil safety regulations in the hydropower industry. Moni-toring the accumulator ensures that any energy which is to be supplied as needed is always available. This means that hydropower plants can be

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ACHYDAC develops bespoke accumulator and sensor solutions for hydropower plants.

Hydropower plants make a vital contribution to the supply of sustainable energy. HYDAC, one of the leading companies in fluid power, hydraulics, process technology and electronics, also proves its expertise in the hydropower industry. HYDAC provides optimal plant safety for every hydropower plant with its self-developed range of accumulator and sensor solutions.

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shut down in a controlled manner in emer-gencies.

ACCUMULATOR MONITORINGHYDAC‘s range of piston linear position measurement systems is very diverse and can offer the right solution for every type of challenge.For example, there are mechanical visualisa-tion techniques such as those involving ma-gnetic flap indicators (M) which are atta-ched to the outside of the accumulator. Monitoring can also take place via one or several ultrasonic position switches (UP). Other options include magnetostrictive measuring techniques (L), which are offered as an external as well as internal solution, and the well-established cable tension mea-surement system (S). A new and innovative type of piston accu-mulator level monitoring is laser position measurement (LR). A main advantage of this type of monitoring system is that it is very easy to service. Service costs are drasti-cally reduced thanks to the low-maintenan-

ce sensor change pro-cess which does not require nitrogen to be discharged on the gas side of the accumula-tor. The condition of blad-ders in bladder accu-mulators can also be monitored in addition to the condition of piston accumulators. For this, HYDAC of-fers the BIS (Bladder Integrity System).Incoming fluid is de-tected by a sensor in the accumulator blad-der. Bladder breakage is detected and a signal is given out. This means that the hydraulic systems for the shut-off valves or turbines can be shut down in a controlled manner using energy from the hydraulic pumps.

CUSTOMER BENEFITS• Continuous condition monitoring prevents unscheduled downti-

mes

• Reduction in repair costs and unforeseen service costs

• Increased process reliability and protection against overspeed and delayed emergency shut-downs

• Innovative monitoring solutions increase system availability

• Resources can be conserved by using HYDAC‘s laser level moni-toring system (sensor change is possible without needing to release gas)

• Monitoring and predictive maintenance can be optimised by inte-grating signals into HYDAC‘s condition monitoring concept

You can receive detailed information and further advice from HYDAC industry specialists (see information box below for contact details).

Advantages Safe emergency shutdown for shut-off valves and turbines

Monitoring of bladder accumulator functioning

The right piston position monitoring system for piston accumulators and accumulator stations

Initial installation and upgrades

An internationally active, family-run company group providing a worldwide service right from commissioning to proper maintenance

BIS

www.hydac.comHYDAC International GmbH, Industriegebiet, 66280 SulzbachT +49 (0)2234 96766-5449, hydro-power@hydac.com

UPL

Accumulator technology and monitoring for hydropower plants

LRS

M

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bladder intact

HYDAC supplies fully assembled, ready for use piston accumulator and bladder accumulator stations as well as individual accumulator components.

bladder defective

Laser linear position measurement system

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