參數(shù)資料
      型號(hào): SR211A101KTA
      英文描述: KONDENSATOR RADIAL 100PF 100V 5ST
      中文描述: KONDENSATOR徑向100pF的100V的5ST
      文件頁(yè)數(shù): 5/72頁(yè)
      文件大?。?/td> 1107K
      代理商: SR211A101KTA
      3
      In practice the current leads the voltage by some other
      phase angle due to the series resistance R
      . The comple-
      ment of this angle is called the loss angle and:
      Power Factor (P.F.) = Cos
      f
      or Sine
      d
      Dissipation Factor (D.F.) = tan
      d
      for small values of
      d
      the tan and sine are essentially equal
      which has led to the common interchangeability of the two
      terms in the industry.
      Equivalent Series Resistance –
      The term E.S.R. or
      Equivalent Series Resistance combines all losses both
      series and parallel in a capacitor at a given frequency so
      that the equivalent circuit is reduced to a simple R-C series
      connection.
      Dissipation Factor
      The DF/PF of a capacitor tells what percent of the
      apparent power input will turn to heat in the capacitor.
      Dissipation Factor
      =
      E.S.R.
      =
      (2
      π
      fC) (E.S.R.)
      X
      C
      The watts loss are:
      Watts loss
      =
      (2
      π
      fCV
      2
      ) (D.F.)
      Very low values of dissipation factor are expressed as their
      reciprocal for convenience. These are called the “Q” or
      Quality factor of capacitors.
      Insulation Resistance –
      Insulation Resistance is the resis-
      tance measured across the terminals of a capacitor and
      consists principally of the parallel resistance R
      shown in
      the equivalent circuit. As capacitance values and hence the
      area of dielectric increases, the I.R. decreases and hence
      the product (C x IR or RC) is often specified in ohm farads
      or more commonly megohm microfarads. Leakage current
      is determined by dividing the rated voltage by IR (Ohm’s
      Law).
      Dielectric Strength –
      Dielectric Strength is an expression
      of the ability of a material to withstand an electrical stress.
      Although dielectric strength is ordinarily expressed in volts,
      it is actually dependent on the thickness of the dielectric
      and thus is also more generically a function of volts/mil.
      Dielectric Absorption –
      A capacitor does not discharge
      instantaneously upon application of a short circuit, but
      drains gradually after the capacitance proper has been dis-
      charged. It is common practice to measure the dielectric
      absorption by determining the “reappearing voltage” which
      appears across a capacitor at some point in time after it
      has been fully discharged under short circuit conditions.
      Corona –
      Corona is the ionization of air or other vapors
      which causes them to conduct current. It is especially
      prevalent in high voltage units but can occur with low
      voltages as well where high voltage gradients occur. The
      energy discharged degrades the performance of the
      capacitor and can in time cause catastrophic failures.
      CERAMIC CAPACITORS
      Multilayer ceramic capacitors are manufactured by mixing
      the ceramic powder in an organic binder (slurry) and cast-
      ing it by one technique or another into thin layers typically
      ranging from about 3 mils in thickness down to 1 mil or
      thinner.
      Metal electrodes are deposited onto the green ceramic
      layers which are then stacked to form a laminated
      structure. The metal electrodes are arranged so that their
      terminations alternate from one edge of the capacitor to
      another. Upon sintering at high temperature the part
      becomes a monolithic block which can provide extremely
      high capacitance values in small mechanical volumes.
      Figure 1 shows a pictorial view of a multilayer ceramic
      capacitor.
      Multilayer ceramic capacitors are available in a wide range of
      characteristics, Electronic Industries Association (EIA) and
      the military have established categories to help divide the
      The Capacitor
      E.S.R.
      C
      d
      I (Ideal)
      I (Actual)
      Phase
      Angle
      Loss
      Angle
      V
      IR
      s
      f
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