safe clearance working safety actuator safety alarm system safety assembly safety circuit safety element safety interlock system safety logic assembly safety member safety monitoring assembly safety power cutback system safety shutdown system safety system salable salable output saleable saleable coal saleable output salinity energy salinity gradient energy sand trap satellite substation SBP spirit scattered radiation scheduled operation scouring device scram screen screen deck screening screening surface sea sealed radioactive source sealed source seam seasonal storage seasonal tariff seasonal time-of-day tariff sea temperature gradient power station second second angle secondary air secondary control secondary coolant secondary coolant circuit secondary failure secondary migration secondary operation secondary power control operation secondary production secondary recovery secondary regulation secular equilibrium security of supply seed seismic prospecting seismic survey selective crushing selective flotation selective grinding selector switch disconnector self-consumption self discharge self-extinguishing current limit self-extinguishing fault self-powered neutron detector self-production self-regulation self-regulation control self-restoring insulation self service station self-sustained reaction semi-coke semi-submersible platform semi-submersible rig semi-thermal area sensitivity sensitivity of a motor gasoline separated phase layout separate earth electrodes separate network operation separation separation density separation energy Separation process series compensation series impedance series injection of a centralised telecontrol signal service reliability service security service station set transformer severance tax shadow shield shaft shaker shaking screen shaking table shale shale oil sheath shield shielded cell shielded chamber shielded nuclide shielded window shielding shielding window shim element shim member shimming short-circuit current short-circuit current capability short-circuit power short-run marginal cost short ton shroud shunt admittance shunt compensation shunt injection of a centralised telecontrol signal shunt injection of a centralized telecontrol signal shutdown power shutdown reactivity shut-in well shutoff valve side-boom tractor Siemens sieve analysis sievert single bore-hole technology single busbar substation single-deck screen single feeder single-line diagram single line to ground fault single-phase network single shot reclosing single supply sinks six-phase network size analysis

sizing skimming pit skimming plant slack slack bus slimes slim hole slowing-down slow neutron slug slurry slushpit smokeless fuel smoke point sodium-hydroxide treatment soil moisture meter solar altitude solar altitude angle solar aperture solar captor solar cell solar cell array solar cell panel solar collector solar concentrator solar constant solar declination solar energy solarimeter solar module solar panel solar photovoltaic cell solar pond solar power solar power station solar radiation solar thermoelectric converter solar tower power station solar wall solfatara solidly earthed neutral system solid propellent solution gas solution gas drive solution-gas drive solution type reactor tank solvent extraction sorted coal source material source of energy source of energy source of harmonic current source of harmonie voltage source range sour crude sour crude oil sour gas spark gap sparkover special boiling point spirit special fissionable material special nuclear material specific burnup specific burn-up specific consumption specific power spectral shift control spectroradiometer speed governor spent fuel spent fuel pit spent fuel pool spent fuel storage spike spillway spinning reserve of a system spoil spontaneous fission spontaneous ignition temperature spray water squeeze squeeze cementing squeeze job SR gasoline stabilised gasoline stability limit of a system state variable stability margin of a system state variable stability zone stabilized gasoline stable nuclide stack stack effect standard pile standby charge stand-by generator stand-by supply standby tariff standing charge standing charge tariff star-polygon conversion star-polygon transformation static head static level meter statistical impulse withstand voltage steady-state load characteristic steady state of a system steady state stability of a power system steam-and-fire distillation steam chugging steam coal steam distillation steam drive steam flooding steam injection steam turbine step-down substation step insertion of reactivity step-out well step tariff step-up substation steradian stock stock ground storage storage basin storage facility storage ground storage in caverns storage in fissures

storage level storage of more than one year storage tank storage yard store straight-cut gasoline straight-run straight-run gasoline stray currents strength of the wind string stringer string of rods strip mining strip mining development stripped gas stripper well stripping pump stripping ratio structural test hole structure hole subcadmium neutron subcritical reaction submarine cable submarine line subscribed demand subscriber substation substation control room substation relay building substation relay kiosk substation relay room substation telecontrol room substitute natural gas subsynchronous resonance subterranean cable successful reclosing sulfur content sulfur content meter for hydrocarbons sulfur oxide sulfur spring sulphur content sulphur content meter for hydrocarbons sulphur oxide sulphur spring sump pump sun's radiation supercritical reaction superheated steam superheated vapor superheated vapour superheater supplementary load loss supplementary tariff supplier supply supply agreement supply disconnection supply-interruption costs supply service supply terminal supply undertaking supply voltage support pole suppression pool surface mining surface power density surface working surge arrester surge diverter surge impedance of a line surge shaft surge tank surplus supplies surrounding rock survey survival wind speed suspension sustainable energy sources sweet crude oil sweetening sweetening treatment sweet gas sweet gasoline sweeting swell swelling index swelling number swept area swept circle swimming-pool reactor swing curve switchable busbar switch bay switch board switch desk switched busbar circuit-breaker switching impulse switching impulse protective level switching overvoltage switching substation symmetrical fault syngas synthesis gas synthetic natural gas system annual load factor system configuration system demand control system diagram system incident system losses system operational diagram system pattern