Maydown Industrial Estate, Derry N. Ireland BT47 6UQ Tel: +44-(0)2871-860265 Fax: +44-(0)2871-860479 Email: sales@hivoltcapacitors.com           info@hivoltcapacitors.com

The PMR range of capacitors are manufactured using a mixed dielectric material that consists of polyester/polypropylene film and capacitor tissue. They are impregnated and filled with a mineral oil. The container is a rolled-seamed tinplate case that is hermetically sealed. The internal construction is designed to prevent movement when the capacitor is subjected to mechanical shock or vibration. External connections are via ceramic terminals with threaded studs or solder tags. Capacitors are supplied with clip on brackets. Other brackets are available on request. These capacitors can be mounted in any position. The finish consists of two coats of high build light grey weather work cellulose enamel (other colours available on request).  Note: The impregnant used is a non toxic highly refined, purified and inhibited mineral oil.

Applications: The PMR range of capacitors is specifically designed for DC applications such as filters, bypass and coupling of low frequency audio. Other applications include:

Capacitors required for AC applications and High Discharge rates can also be designed from the PMR range. Consult Hivolt Capacitors for your specific requirements.

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 100°C temperature change.

Voltage Range: 200VDC - 40kVDC

Fig 1. Ripple: The sum of the peak ripple voltage and the DC voltage should not exceed the rated voltage. Refer to graph fig 1 for permissible peak-to-peak ripple voltage as a percentage of rated voltage for various frequencies.

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
The test voltage is applied and discharged through a resistance of at least one ohm per rated volt up to a maximum of 5000 ohms.      

DIMENSIONS IN mm K = B + 36 L = K - 25 M = C - 10 N = C - 30 SLOT WIDTH 6.35 SLOT LENGTH 12.7

  Custom designed capacitors are available to meet your specific application. Please complete and return our :-

[  CAPACITOR APPLICATION QUESTIONNAIRE ] 

Examples From Product List - Details of other values on request.  

DIMENSIONS IN MILLIMETRES +/- 2mm
 * These capacitors are fitted with one high voltage terminal and one case terminal. An additional terminal for connection to case is available as an optional extra. Add suffix M to Part Number. Note: Non standard size containers can be supplied on request

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).

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

Fig 3. 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).

Fig 4. Life expectancy: PMR 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 (fig 4).

Weight: The approximate weight in kg of capacitors in the PMR range can be estimated by multiplying the volume of the capacitor container by 1.45 x 10^-6