Type LK-ND capacitors are designed primarily for energy storage/discharge applications of high current discharge at low repetition rates. This generally means 30 shots per minute or less. It is advisable to consult our Engineering Staff with your specific application.
Applications for this type of capacitor include: PULSE X-RAY; PHOTOFLASH; LASER PUMPING; PULSE-FORMING NETWORKS; HIGH INTENSITY STROBE or any other use where high current pulses are to be required or , under fault conditions in the equipment, may be infrequently expected.
Construction of the capacitor is similar to that of MIL-C-19978; NOT QPL LISTED it uses a CP70 style military can and is hermetically sealed. All high voltage terminals are of the solder-seal variety; this is an advantage in that it eliminates gasket failure of the hermetic seal, a common fault mode in some capacitor types, as gaskets age and deteriorate. Internally, the individual capacitor elements are wound using extended foil (low inductance) design and the elements are connected to the brass terminal stud with heavy copper braid.
Impregnant used in this series is an environmentally safe mineral oil, with a flash point greater than 145°C. It is classified by U.S. O.S.H.A. as a "Class III b combustible" (see 29CFR1910.106.a. 18.ii.b), which is the highest rating for any liquid that can, somehow, be made to burn. NOTE: for specialized applications, even higher temperature impregnants can be used.
Temperature Range is -55ºC to +85°C with nameplate voltage applied. In many cases it is possible to operate a capacitor at greater than rated voltage, if the temperature is much less than maximum ambient rating, i.e., room temperature vs. 85°C. Consult our Engineering Staff.
Capacitance Tolerance standard for this series is ±10% of nominal value Other tolerances are available, on special order.
Dielectric Resistance see the graph.
Power (Dissipation) Factor although this figure is generally dictated by the type of dielectric film used in the capacitor, it is also affected by the type of oil, wire size, internal connections. . . in effect, it is the sum of all the factors that will impede the flow of electrons. For the LK-ND series the max. dissipation factor is .005, at 100Hz, at 25°C. See the graph.
Equivalent Series Resistance is the function of dissipation factor, frequency and capacitance. ESR for a particular capacitor may be obtained by using the following formulae:

Inductance also limits the flow of current and, the higher the inductance, the longer the pulse (all other factors being equal) . . . Consult our Engineering Staff for specific inductance values.
Acceptance Tests for this series are 100% testing for: capacitance; hermetic seal; dissipation factor; over voltage. An AQL sample test is performed for insulation resistance. TEST VOLTAGES: terminal to terminal (T-T) will be 200% of rated voltage, nameplate voltages through 20KVDC; 150% of rated voltage with the nameplate voltages over 20KVDC. The terminal to case (T-C) test voltage is the above figure + 1000VDC. Other tests will be performed at buyer's expense.
Mounting Brackets. Footed mounting brackets are supplied with these capacitors at no additional cost.

How to Order. Check the listing for capacitance and voltage. In some instances, there are 2 or 3 alternative packaging configurations available for a single voltage/capacitance value. For ratings of 20KVDC and above, an (*) asterisk in the "D" column indicates 1 terminal and case grounded.