Water Turbines

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  Horizontal-shaft Francis turbine

  Toyokawa Power Station, Chugoku Electric Power Co., Ltd.

  We have provided many units of this type of water turbine for many years, and it is suitable for small and medium-scale hydropower generation.

  • Turbine type: Horizontal-shaft single-runner single-flow spiral-casing double-discharge Francis turbine
  • Output: 2,800 kW

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  Vertical-shaft Francis turbine

  Shimoyama Power Station, Chugoku Electric Power Co., Ltd.

  This type of water turbine is used across a wide range of heads, from several tens of meters up to several hundred meters.

  • Turbine type: Vertical-shaft single-runner single-flow spiral-casing Francis turbine
  • Output: 3,740 kW
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  Pelton turbine

  This turbine uses the velocity of water by spraying water onto bowl‑shaped blades to drive rotation and is effective in locations with very high heads where types such as the Francis turbine cannot be used.

  • Turbine type: Horizontal-shaft single-runner two-jet Pelton turbine
  • Output: 834 kW
• 

  Cross-flow turbine

  This turbine rotates using the velocity of water, but it is named cross-flow because water flows across the impeller.

  • Turbine type: Horizontal-shaft single-runner two-blade cross-flow turbine
  • Output: 450 kW

Inlet Valves

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  Biplane valve

  Compared with a butterfly valve, this valve provides lower head loss when fully open and excellent sealing performance, making it the most widely adopted valve in recent years.
  It can widely used for medium heads ranging from 40 to 250 m.

  • Nominal diameter: 600 to 1,900 mm
  • Applicable water head: Medium head, 40 to 250 m

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  Eccentric rotary valve

  Off-setting of the valve stem eliminates complex operating mechanisms to provide an economically excellent valve. This valve is designed for high-head applications and can be manufactured with either hydraulic or electric operation.

  • Nominal diameter: 600 to 1,130 mm
  • Applicable water head: High head, 200 m or more
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  Needle valve

  Being highly resistant to cavitation erosion makes the valve suitable for high water pressure applications. It is mainly used as a bypass valve for inlet valves and is manufactured with a welded structure.

  • Nominal diameter: 80 to 300 mm

Governors

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  Electric servomotor (with cyclone speed reducer)

  Adoption of an electric servomotor with a cyclone speed reducer simplifies maintenance and reduces overall costs. You can select Y, Y’, or Z class performance depending on the governor function. This servomotor with a cyclone speed reducer allows for detailed on-site inspection.

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  Hydraulic servomotor

  This product is used in hydraulic‑operated power plants, and actuators can be upgraded by repurposing the hydraulic servomotors.

Auxiliary Equipment for Water Turbines

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  Hydraulic equipment

  This system supplies pressurized oil to hydraulically operated inlet valve servomotors and governor servomotors.

  • Hydraulic tank capacity: 40 L to 20,000 L

  Main components

  • Hydraulic tank
  • Oil collecting tank
  • Hydraulic pump set
  • Unloader
  • Air supply cylinder and check valve
  • Safety valve of hydraulic tank
  • High-pressure oil gauge and various measuring instruments
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  Pressure regulator

  This regulator is designed to release casing water pressure only when the guide vanes are closed rapidly.

  • Applicable water head: 40 to 300 m
  • Flow rate: 0.5 to 15 m3/s

  Main equipment

  • Pressure regulator main unit
  • Pressure distribution valve
  • Dashpot
  • Return mechanism

Repairs

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  Water turbine repair

  Regular maintenance ensures that equipment can continue operating safely and reliably as a valuable source of clean energy.
  We can repair not only our own products but also other manufacturer's water turbine equipment.

  • Runner build-up repair
  • Guide vane build-up repair
  • Replacement of water turbine cover liner
  • Oil-less bushing replacement
  • Temporary water turbine assembly
• 

  

  Electrification of the turbine governor

  Converting the hydraulic system to electric operation eliminates the use of oil to achieve cleaner operation.
  We can also improve the governors of other company's water turbines. It is possible to eliminate hydraulic equipment by electrification.

  • Electrification of vertical-shaft turbine governors
  • Electrification of horizontal-shaft turbine governors

Generators

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  Synchronous generator

  Synchronous generators can operate in both grid-connected and islanded modes, and are also applicable to large-capacity power plants.

  • Generator capacity: 100 to 20,000 kVA
  • Frequency: 50 / 60 Hz

  We can also repair existing generators.

  • Stator coil rewinding
  • Rotor coil rewinding
  • Insulation renewal (resin mold)
  • Wind tunnel damper opening/closing mechanism
  • Oil smoke prevention device

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  Induction generator

  Induction generators are suitable for relatively small power plants due to their simple structure, cost-effectiveness, and easy maintenance, as well as not requiring power factor correction.

  • Generator capacity: 2,000 kW or less
  • Frequency: 50 / 60 Hz

  We can also repair existing generators.

  • Stator coil rewinding
  • Rotor coil rewinding
  • Insulation renewal (resin mold)
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  Electromagnetic brake

  This brake has a simple structure with an electromagnetic coil and iron core.
  A DC voltage is applied to the coil and the resulting electromagnetic force creates suction that lifts the brake pad, stopping movement through friction with the brake ring.

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  Electric brake

  This is a long-life brake that automatically adjusts the wear of the brake pad. A screw converts the DC motor’s rotational force into linear motion, raising the brake pad and stopping the rotor by friction against the brake ring.

Control Equipment

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  Distribution panels

  We manufacture various distribution panels necessary for controlling water turbine generators.

  
  

  Line-up

  • Generator control panel
  • Protection relay panel
  • Automatic control panel
  • Remote monitoring and control panel
  • Automatic voltage regulator panel
  • Internal panel
  • Integrated control panel
  • Transmission line panel

  Models

  • Free-standing vertical type
  • Wall-mounted vertical type
  • Bench type
  • Disk type
  • Wall-mounted type
  • Stand type
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  Automatic gate controller

  We are producing this controller that automatically control dam gates used in civil engineering equipment.

  
  

  System application examples

  • Automatic flood discharge gate controller
  • Automatic water intake gate controller
  • Automatic discharge gate controller for reverse-regulating pond
  • Automatic dam surface-intake gate controller
  • Automatic dam discharge valve controller

  We produce various other control equipment for civil engineering equipment. Please inquire with us for more information.

Other Hydropower Equipment

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  Mixed-water relay (MWR type)

  This relay is used to detect water in the pressure-oil collection tank and the bearings. The tube protecting the sensing element is made of stainless steel.

  • Relay contact rating, non‑inductive load: AC125 V, 2 A
  • Uses turbine oil: VG 32 to VG 83
  • Operating temperature and temperature range (relay section): -10 ℃ to +50 ℃ (with no freezing or condensation)
  • Withstand voltage test voltage: AC2,000 V for one min.
  • Relay weight: 2.0 kg

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  Dam gate opening meter (ED type)

  Digitally encodes the water level (absolute water level as well as vertical width) of dams, rivers, tanks, and similar items, as well as the opening angle of gates, valves, and similar equipment in units of 1 cm to 50 m, and transmits the corresponding information.

  • Adoption of digitalization provides higher accuracy and no reading errors in comparison with the conventional analog method.
  • The BCD signal is output from the rotary encoder so that it can easily be connected to computer control.
  • Adoption of the absolute method (absolute water level and opening angle display) enables it to display correct values after recovery from a power failure.
  • Analog signals can be output by incorporating a limit switch and potentiometer (options) in the transmitter body.
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  ETH automatic backwash strainer

  This strainer is used for cooling and supply water of water turbine generators.

  • The filter has a disk shape making it easy to change the mesh according to the application.
  • If foreign material flows into the main body, the shearing mechanism breaks it down and discharges it to prevent clogging of the filter.
  • Automatic backwashing by differential pressure detection and simultaneous operation by timer are also available.
  • Its effectiveness is especially evident when a large amount of wood chips or fallen leaves flow in.
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  Computing device (EACS-322A)

  This product was developed using technologies refined through many years of delivering control and monitoring computer systems. Each unit that makes up the device provides superior reliability and environmental resistance.

  • Separate microprocessors are used for both the data processing and the communication processing sections.
  • The building-block structure allows you to freely combine units to match the number and types of input/output signals.
  • The use of microprocessors and LSI enables a compact overall design.
  • We are currently developing a next-generation computing unit. (Scheduled for release soon.)
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  Signal distribution and conversion device (EARS-22F)

  This product is capable of distributing and converting incoming digital signals for output. Each unit that makes up the device provides superior reliability and environmental resistance.

  • The device can distribute and output the input digital signals through dry (non-voltage) contacts.
  • It can also switch between two different types of digital signals for output.
  • In addition, the device supports analog signal input and output, enabling analog-to-digital and digital-to-analog signal conversion.
  • The building-block structure allows you to freely combine units as needed.
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  Optical interface unit/Optical data receiver

  The optical interface unit converts incoming digital signals into optical serial signals and transmits them. The transmitted optical serial signals are received and verified by the optical data receiver, which then outputs them externally as digital signals.

  • The optical interface unit uses a dedicated battery, so no wiring other than the optical cable is required (no power cable needed), and its low-power design allows long-term operation without battery replacement.
  • The optical data receiver is equipped with four ports for digital signal output and a seven-segment display, making it easy to check the data.
  • Since they use optical serial signals, they can transmit and receive data reliably without being affected by lightning or electrical noise.
  • Two types of transmission optical cables, PCF and GI, are supported.
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  Digital display

  This is a highly versatile seven-segment LED display unit designed for installation on remote monitoring panels and similar equipment, displaying various quantities that have been converted into BCD signals such as water level, opening angle, and flow rate.

  • It uses large high-brightness seven-segment LEDs, providing clear visibility even in bright environments.
  • The LEDs use a dynamic lighting method to provide low power consumption and long service life.
  • The latch signal input enables data retention.
  • The device is compact and easy to mount on a panel.