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Rotation Speed Measurement and Flow Control by Governor in Hydroelectric Power Generation
In hydropower generation, when power generation is interrupted, the turbine or generator may spin out of control, damaging rotating parts and seals.
To avoid this, control measures such as closing the valves in the waterway must be taken as soon as possible after power generation is shut down.
Overview
The rotation of a water wheel or other device is detected by a gear sensor, which outputs a frequency pulse signal corresponding to the rotation speed.
The signal is input to a speed regulator through a signal converter to open and close valves in the waterway.
What can be done in this application
Gear sensor
- Capable of detecting from 0 Hz, the sensor can measure the motion of a rotating object such as a turbine when it starts or stops in detail.
- The sensor detection surface is a hermetically sealed one-piece metal case with a highly reliable structure.
- The cable pull-out part is made by our unique Conical Press™ and can be used in environments where water or oil adheres to the cable.
Signal Converter
- High accuracy from ultra-low speed to high speed with unique Periomatic™ calculation. Fast response to sudden speed fluctuations of the turbine.
- Analog output selectable from 0-10V, 0(1)-5V, 4-20mA, etc. (internal program switching or specified when ordering).
Full-scale value can be set according to the governor (speed regulator).
- Alarm output can be optionally selected for the SPD series. An alarm signal can be output when the specified rotation speed is exceeded.
Selection Points
Gear sensor
- Detectable from 0Hz
- IP67: Hermetically sealed one-piece metal case or unique cable withdrawal technology Conical Press™.
Signal converter
- Unique Periomatic™ calculation
- Analog output with fast update time
| Product | Point | Overview | |
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Magnetic Gear Speed Sensor FDP series Product page |
Semi-open collector output Wide power supply range Conical press |
- Full threaded housing for high degree of freedom of mounting. |
 48x96 DIN size |
Speed/totalizer |
USB RS-485 Modbus CAN Analog output Alarm output LINKSHIP compatible |
- Connectable speed/totalizer [switchable] that can be connected to various sensors. |
 24x48 DIN size |
Speed/totalizer SPDL-2401 |
USB RS-485 Modbus CAN Analog output Alarm output LINKSHIP compatible |
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Programmable |
Analog output Dual range LINKSHIP compatible |
- Analog output full scale, parameters, and calculation functions can be set using the LINKSHIP setting software (free of charge) or the PL-1A external setting unit (sold separately). |
Related Products
EX series: Signal converters / Panel meters
| Series Name | EX48 [48x96 size] | EX24 [24x48 size] | EXL24 [24x48 size] | ||||
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Common Features
USB RS-485 Modbus CAN |
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| Thermistor meter | Under Development |
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High conversion accuracy with unique calculation method | |||
| RTD meter |
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Combines with Pt100 to measure temperature | |||
| Thermocouple meter |
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Compatible with TC types K. J, R, E, T, B. N, S | |||
| DC Ammeter |
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±10A to ±100μA: Shunt resistance of 40mΩ or less (±5A, ±2A type) for low loss. | |||
| DC Voltmeter |
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±70V to ±10mV: For real-time measurement and feedback control. | |||
| Resistance Meter |
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4 ranges (150Ω/1.5kΩ/10kΩ/40kΩ) switchable by setting. | |||
| Speed (frequency) meter |
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PERIOMATIC™ calculation for High accuracy and High speed response | |||
| Torque (Freq.deviation) meter |
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For torque or flex fuel sensors with deviation frequency signal output | |||
| Output Update Time* | 0.1ms/1ms/2ms- | 0.1ms/1ms/2ms- | 40ms- | *Varies depending on model |
Related measurement keywords
Speed measurement Gear sensors Signal converters F/V converters List Speedmeter List
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