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          PMW Range

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          PMW Range

          The PMW range are in the form of a welded heavy gauge mild steel can that is hermetically sealed. External connections are via ceramic bushings. The range may be supplied with fixing brackets, handles or lugs for lifting.

          Specifications

          They are impregnated and filled with a mineral oil. The container is manufactured from heavy gauge, cold rolled steel that is welded and hermetically sealed. The internal construction is designed to prevent movement when subjected to vibration or mechanical shock. The capacitors’ containers are primed and glossed. The capacitors may be supplied with fixing brackets, handles or lugs for lifting. Larger capacitors are mounted on wheels.

          NOTE: The impregnant used is a non toxic highly refined, purified and inhibited mineral oil.

          APPLICATIONS: The PMW range of capacitors are specially designed for DC filtering and bypass applications such as high voltage power supplies for lasers, radar and x-ray, RF transmitters, traction equipment and generators where reliability and long life are prime considerations.

          Capacitance Range: 0.01μF-100μF. The tolerance is +/-10%. Other tolerances are available on request. Nominal values measured at 1kHz.

          Temperature Range: -55°C to 85°C. The nominal voltage rating is applicable from -55°C to 85°C. Derating is required for higher operating temperatures.

          Temperature Coefficient: Capacitance will increase by 2% per 100oC temperature change.

          Voltage Range:?1KVDC - 80kVDC

          RIPPLE:

          RIPPLE.png

          Ripple: The sum of the peak ripple voltage and the DC voltage should not exceed the rated voltage. The graph above shows permissible peak-to-peak ripple voltage as a percentage of rated voltage for various frequencies.

          Test Voltage: V Test(Terminal to (Terminal)
          For DCrating <20kV Vtest=2.0 x Rated Voltage for 1 miute
          For DC rating >20kV Vtest=1.5x Rated Voltage for 1 minute
          Case to terminal Test voltage VTest+1kV (Note where necessary terminals are joined together during testing)
          Test Voltage: V Test
          For DC rating <20kV:V Test = 2.0 x Rated Voltage for 1 minute.
          For DC rating ≥20kV:V Test = 1.5 x Rated Voltage for 1 minute.
          Case to terminal Test voltage = V Test + 1kV

          Power Factor

          power v temp 04.jpg

          Power Factor: Variable; function of temperature and frequency. See fig 2. Nominal value < 0.5% at 20oC.

          Dieletric Resistance

          insulance temp03.jpg

          Dieletric Resistance: (Parallel resistance) Indicated by the graph of insulance (Mohms x μF) vs Temperature (fig 3). The insulance(Mohms x μF) is nominally 10000s at +20oC. (Measurements taken after 1 minute with an applied voltage of 500V).

          Life expectancy

          life 03.jpg

          Life expectancy: PMW type capacitors are designed for a life expectancy of 50000 hours at 65oC. To achieve the same life expectancy at 85oC derate to 60% of rated voltage.

          Flashover

          V?Rated?< 5kV, the terminals will withstand 125% of rated voltage without flashover @ 85mm Hg (equivalent to 50000 ft altitude).

          V?Rated?> 5kV, the terminals will withstand 125% of rated voltage without flashover @ 500mm Hg (equivalent to 10000 ft altitude).



          Dimensions

          SELECT WORKING VOLTAGE:

          KilovoltsCapacitanceABC
          DCμF
          624345160130
          640450250145
          7.535260250170
          837530290150
          89200305120
          1032380325205
          105200160140
          108260250105
          124270215180
          157380290125
          1512710355130
          1535660455230
          184380330105
          187380325165
          204380340120
          207710355130
          2010695470100
          2020695470180
          252380330105
          254540305125
          255530350140
          2512720570200
          301260255160
          302370330130
          304540385135
          404400600235
          602570415270
          800.1235310130

          NOTES:


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