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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ALL
SymbolNameUnit
D $D_{ab}$Diameter over armour beddingmm
$D_{ar}$External diameter of armourmm
$d_{ar}$Mean diameter of armourmm
$d_b$Diameter of the backfillmm
$d_{b3}$Distance c of multi-layer backfillm
$d_{b4}$Distance d of multi-layer backfillm
$d_c$External diameter of conductormm
$D_c$Diameter of conductorm
$d_{ci}$Internal diameter of conductormm
$D_{comp}$Diameter of compartment (metric)m
$d_{comp}$Diameter of compartmentmm
$d_{ct}$External diameter of conductor for transient calculationsmm
$D_{di}$Inner diameter of ductm
$D_{do}$Outer diameter of ductm
$D_{dry}$Diameter of drying zonem
$D_e$External diameter of objectmm
$d_e$Equivalent diameter of screen/sheath and armourmm
$d_{encl}$Outer diameter of enclosuremm
$D_{encl}$Outer diameter of enclosure (metric)m
$D_{eq}$Equivalent diameter of a group of round objectsmm
$D_{ext}$Overall outer diameter of pipem
$D_f$External diameter of the fillermm
$d_f$Spacing from hottest object in groupm
$D_i$Diameter over insulationmm
$d_{im}$Imaginary layer of soilm
$D_{in}$Inner diameter of pipem
$D_{ins}$Diameter over insulation without insulation screenmm
$d_{ins}$Diameter of insulation around pipemm
$D_{it}$Diameter over insulation for transient calculationsmm
$d_j$Diameter below jacketmm
$D_j$Diameter over jacketmm
$D_o$Outer diameterm
$d_{pk1}$Distance to mirrored buried objectmm
$d_{pk2}$Distance between buried objectsmm
$d_{prot}$Diameter of protective covermm
$d_{psc}$Point source correctionm
$D_{ref}$Reference diameter for determination of OHTCm
$d_s$Equivalent diameter of screen and sheathmm
$D_{sc}$Diameter over screenmm
$d_{sc}$Mean diameter of screenmm
$D_{scb}$Diameter over screen beddingmm
$D_{scs}$Diameter over screen servingmm
$D_{sh}$Diameter over sheathmm
$d_{sh}$Mean diameter of sheathmm
$D_{shb}$Diameter below sheathmm
$D_{shj}$Diameter of sheath jacketmm
$D_{soil}$Outer diameter of soil layerm
$d_t$Channel coveringm
$d_w$Depth under waterm
$D_{wall}$Outer diameter of steel pipem
$d_x$Equivalent diameter of a conductormm
$D_x$Characteristic diametermm
$D_{x,w}$Characteristic diameter for weekly loadmm
$D_{x,y}$Characteristic diameter for yearly loadmm
$\Delta_1$Substitution coefficient $\Delta_1$ for eddy-currents
$\delta_1$Thickness of screening layermm
$\Delta_2$Substitution coefficient $\Delta_2$ for eddy-currents
$\delta_{ar}$Equivalent thickness of armourmm
$\delta_d$Distance between cable and ductm
$\delta_k$Thickness of screen, sheath or armourmm
$\delta_{soil}$Soil thermal diffusivitym$^2$/s
$\Delta d_{sh}$Depth of corrugationmm
$\Delta H_c$Heat of combustion coefficientMJ/kg
$\Delta t$Length of time steps
$\Delta \theta_{0t}$Air temperature in tunnel increaseK
$\Delta \theta_{0x}$Temperature rise by crossing heat sourcesK
$\Delta \theta_{0x,1}$Temperature rise of the conductor, first estimateK
$\Delta \theta_{0x,h}$Temperature rise of the conductor by source hK
$\Delta \theta_{a,t}$Corrected transient temperature rise of conductorK
$\Delta \theta_{air}$Temperature increase of airK
$\Delta \theta_c$Temperature rise of conductorK
$\delta \theta_c$Ohmic steady-state temperature riseK
$\Delta \theta_{c,t}$Transient temperature rise of conductor by ohmic lossesK
$\Delta \theta_{ce}$Temperature difference, conductor to surfaceK
$\Delta \theta_d$Temperature rise by dielectric lossesK
$\Delta \theta_{e,t}$Transient temperature rise of outer surfaceK
$\Delta \theta_{gas}$Temperature difference, conductor to enclosure°C
$\Delta \theta_{kp}$Temperature rise by buried object kK
$\Delta \theta_{max}$Maximum permissible conductor temperature riseK
$\Delta \theta_p$Temperature rise by other buried objectsK
$\Delta \theta_R$Conductor temperature rise above ambient temperatureK
$\Delta \theta_{R,\infty}$Maximum permissible conductor temperature rise°C
$\Delta \theta_s$Temperature difference surface to ambientK
$\delta \theta_{SPK}$Peak cyclic temperature riseK
$\Delta \theta_{sun}$Temperature rise by solar radiationK
$\Delta \theta_t$Transient temperature rise of conductorK
$\Delta \theta_{t,\infty}$Steady-state temperature rise of conductorK
$\Delta \theta_x$Critical soil temperature riseK
$\Delta \theta_{x0}$VDE soil temperature riseK
$\Delta W$Incremental heat generatedW
$\Delta z$Length of the intervalm
$Di_d$Inner diameter of ductmm
$di_{pipe}$Internal diameter of fluid-filled pipemm
$Di_{sp}$Inner diameter of steel pipemm
$Di_t$Tunnel inner diameterm
$Do_d$Outer diameter of ductmm
$do_{pipe}$External pipe diametermm
$Do_{sp}$Outer diameter of steel pipemm
$Do_t$Tunnel/trough outer diameterm