RVX POWER — digital governor for Pelton, Francis, Kaplan and bulb hydro turbines
RVX POWER is a digital speed governor for hydro units with Pelton, Francis, Kaplan and bulb turbines. It holds nominal frequency and controls active power by changing the water flow through the turbine. Together with the hydraulic part of the FLUIDPOWER line it forms a complete turbine governor for new and modernized hydropower plants, pumped-storage plants and small hydropower plants.
- Turbines
- Pelton, Francis, Kaplan, Bulb
- Functions
- speed, active power, opening; opening limiter; start/stop; creep detector; HPU control
- Testing
- simulated isolated grid IEC 60308 / IEEE 1207
- Options
- level control, frequency trimming, power and cavitation limiters
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The governor holds the unit speed constant so that the generator voltage frequency stays at nominal. It acts through water flow, on which power depends directly, so the same loop also controls active power, both in parallel operation with the grid and on an isolated load. The hardware, software and setup tools are identical for turbines of any type and size and match those used in the RTX POWER excitation system. Plant personnel deal with one platform during testing, operation and repair.
Basic functions cover control of speed, active power and opening, an opening limiter, bumpless transfer between modes, start and stop automation, smooth unit start-up, control of hydraulic actuators and a creep detector. The governor monitors the oil pressure unit, piping and bypass valves. For Kaplan and bulb turbines, a reduction of runner blade movements is provided. Less oil is consumed, components wear more slowly, and the oil pump starts less often. For Pelton, the number and priority of nozzles are configured, and the governor selects combinations that keep the jets symmetrical and switches between them without a jolt. Level control, frequency trimming, power limiters and cavitation limiters are added as options.
The governor dynamics are tuned with a simulated isolated grid tool per IEC 60308 and IEEE 1207. After such tuning the unit operates stably in both an interconnected and an isolated grid without switching control loops. The frequency dead band is small, so the governor notices even small deviations. The controller, I/O modules (48 DI/30 DO/16 AI/16 AO, 3 VT inputs and 3 CT inputs, 2000 V isolation) and frequency sensors can be redundant.
Communication with the plant control system runs over IEC 61850 GOOSE/MMS, DNP3.0, IEC 60870-5-101/104, Modbus TCP/RTU. Time is synchronized by IRIG-B, NTP or PTP, the recorder logs signals with a resolution below 1 ms and has eight triggers for recording before and after an event. Programming is open per IEC 61131-3, so custom adaptive power or level control algorithms can be added. RVX POWER is supplied with a new or an existing oil pressure unit. The hydraulic block with an electrohydraulic converter on standard distributors is rated for flow up to 1500 L/min, the version with main spool valves up to 10 000 L/min.
Technical specifications
| Turbines | Pelton, Francis, Kaplan, Bulb |
|---|---|
| Functions | speed, active power, opening; opening limiter; start/stop; creep detector; HPU control |
| Testing | simulated isolated grid IEC 60308 / IEEE 1207 |
| Options | level control, frequency trimming, power and cavitation limiters |
| I/O | 48 DI / 30 DO / 16 AI / 16 AO, 3 VT, 3 CT; 2000 V isolation |
| Oil pressure unit | new or existing; up to 1500 L/min (standard distributors) or up to 10 000 L/min (main spool valves) |
| Protocols | IEC 61850 GOOSE/MMS, DNP3.0, IEC 60870-5-101/104, Modbus TCP/RTU |
| Synchronization | IRIG-B, NTP, PTP |
| Programming | IEC 61131-3, open |
Request a price and lead time
RVX POWER — digital governor for Pelton, Francis, Kaplan and bulb hydro turbines. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
Which hydro turbine types does RVX POWER work with?
With Pelton, Francis, Kaplan and bulb turbines of any size. The hardware and software are the same for all types.
What flow is the hydraulic part of the governor rated for?
The hydraulic block with an electrohydraulic converter on standard distributors gives up to 1500 L/min, and the version with main spool valves up to 10 000 L/min. The governor can also be supplied with an existing oil pressure unit.
Which standards are used to tune the governor for isolated grid operation?
The simulated isolated grid tool is built per IEC 60308 and IEEE 1207. After tuning, the unit operates stably in an interconnected and an isolated grid without switching control loops.
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