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Braun

Turbine overspeed protection systems and speed sensors

Rotation velocity sensor

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Main sensor properties

  • Speed range: from close to zero to 12000 counts per second (response time: not more than 40 microseconds)
  • Distance to object for rotating part: up to 4 mm (depending on the profile size)
  • Temperature range: -40 ° C ... +125 °C (-40 ... +255 °F)
  • Sensor’s differential operating principle allows to exclude possible impact of magnetic fields or mechanism vibration
  • Insulated stainless steel casing (1.4305) with IP67 protection class allows sensor tip to take up pressure > 200 bar. Sensor can be connected via hermetically-sealed sleeves or using strapped-down cable (with standard or Teflon insulation)
  • Strong square output signal equally high within the whole speed range. Signal level ≈ corresponds to feeding voltage level. Firm signal transmission to a distance over 500 m
  • Fine and coarse profiles are allowed, including tooth wheels, cut slots, teeth, orifices in any ferrous metals, or rotating magnets

Overspeed protection systems 

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Main protection systems properties

E16x346 system acting as self-contained unit (without external testing by operator or distributed control system (DCS)) with emergency shutdown function complies with SIL3/IEC61508 and DIN EN ISO 13849:2008 Cat.3 PLe standards..
Overall response time for shutdown: <15 ms

Maximum safety upon maximum availability factor is achieved through:
  • TMR (triple modular redundancy) with three E1667 monitors.
  • Triple speed measurement and assessment of value thereof by each monitor.
  • Speed increase actuation setpoint allowing to trace acceleration.
  • Detection of low speed as protection against incorrect assembly or speed sensor malfunction.
  • Continuous speed sensors monitoring.
  • Assessment of external additional devices emergency condition, using relevant channels of each monitor. Response to signals selected for each additional diagnostic channel separately (logic function, low/high emergency condition signal level, response time).
  • Permanent monitors control performed by test signals generator carrying out cyclic, fully automatic tests or external controlled tests.
  • Permanent electromagnetic valves unit control performed under the 2oo3 principle by test signals generator carrying out cyclic, fully automatic tests or external controlled tests.
  • Each shutdown line (emergency circuit) is created according to method 2 and 3.
  • Shutdown lines I, II, III, IV, V, VI are created by the medium of safety switches with a set of contacts actuated by electromagnetic force.
  • Monitoring of shutdown lines with shutdown lock function (selectable).
  • Shutdown lines outputs of 2oo3 emergency valves electromagnetic relay unit are monitored on a permanent basis. If the shutdown lock function is activated when 2 and 3 shutdown lines are in open position, shutdown condition is detected and blocked.
  • Catalog
TitleRUEN
A5S sensors catalog
Braun overspeed protection system description


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