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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