twif 085175, twif 085215, twif 085260 www.vishay.com vishay draloric revision: 11-may-16 1 document number: 22166 for technical questions, contact: powcap@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 watercooled rf power pot capacitors internal cooling system product description twif pot-styled capacitors dissipate the heat produced under load by means of water flow around the capacitor elements. in order to provide pr otection from influences of the chemical / physical characteristics of the coolant, a glass passivation layer is applie d over the cooled inner noble metal electrode. the electrical terminations ar e made directly to the noble metal electrodes either utilizing special soldering techniques or special clamping fittings. this method of attachment provides a stro ng, rigid connection of unsurpassed reliability. the tw if pot-styled capacitors feature an umbrella shaped insulating rim made from silicone elastomer to minimize the adverse effects of moisture, dust and other impurities in the working environment and to improve the characteristics of the electrical field. the capacitor body is protective lacquered. marking type designator, capacitance va lue and tolerance, rated rf voltage, ceramic material code, production date code, manufacturer logo, serial number. accessories added all watercooled pot capaci tors are supplied with the necessary ferrules and 10 mm tube fittings for the water supply connections. features ? high voltage, current and power ratings ? compact design reduces terminal self inductance and permit operation up to higher frequencies ? these pot capacitors featur e increased density through watercooling and rugged mechan ical construction for a maximum reliability applications watercooled rf power pot capa citors are designed for use in the tank circuit of high power rf equipment such as induction heating and welding equipment, dielectric heating or a variety of specialized rf applications. capacitance range 1.0 nf to 4.7 nf capacitance tolerance 20 % ceramic dielectric ? r42 (tcc - 250 ppm/k) ? r85 (tcc - 750 ppm/k) rated voltage 14 kv p dielectric strength test 200 % of rated voltage, 50 hz rf power test 140 % to 180 % of rated power, for 10 minutes in a test generator circuit dissipation factor max. 0.05 % measuring frequencies: ? 300 khz or 100 khz insulation resistance min. 10 000 m ? (at 25 c) operating temperature range details of watercooling find un der guidelines , next pages quick reference data description value ceramic class 1 ceramic dielectric r42, r85 type twif 085215 twif 085175 twif 085260 voltage (vp) 14 000 14 000 14 000 min. capacitance (pf) 1000 2200 4700 max. capacitance (pf) 1000 2200 4700 mounting screw terminal
twif 085175, twif 085215, twif 085260 www.vishay.com vishay draloric revision: 11-may-16 2 document number: 22166 for technical questions, contact: powcap@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 sap part number and electrical data part number ceramic cap. values (pf) rated voltage (kv p ) rated power (kvar) rated current (a rms ) min. water flow rate per minute (liter / us-gal.) wi085215wj10238bh1 r42 1000 14 1500 200 3.7 / 1.0 wi085175wj22238bj1 r85 2200 3.7 / 1.0 wi085260wj47238bj1 4700 4.5 / 1.2 dimensions in millimeters (inches) 22 (0.87) ? 55 (2.1 7 dia.) ? 6 4 (2.52 dia.) m8 thread hole s 20 (0.80) depth m8 thread hole s 8 (0.31) depth thread hole s m8 water outlet moi s ture protection ( s ilicon rubber) ? 120 (4.72 dia.) ? 85 (3.35 dia.) 1 (0.039) connection terminal of the inner electrode element connection terminal of the outer electrode water inlet ? 88 (3.47 dia.) installation position: the s e capacitor s are de s igned to be in s talled in a vertical po s ition, connection fitting s of the water cooling s y s tem up s ide. horizontal in s tallation po s ition i s permi ss ible, whereby the water-outlet mu s t be on top- s ide. wi085215wj10238bh1: 215 2 (8.47 0.08) wi085260wj47238bj1: 260 2 (10.24 0.08) wi085175wj22238bj1: 175 2 (6.89 0.08) ? 44 (1.73 dia.)
twif 085175, twif 085215, twif 085260 www.vishay.com vishay draloric revision: 11-may-16 3 document number: 22166 for technical questions, contact: powcap@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 derating diagrams wi085215wj10238bh1 wi085175wj22238bj1 wi085260wj47238bj1 10 100 1000 10 000 0.1 1 10 100 0.1 1 10 100 fre q uency (mhz) 4.24 mhz 2.43 mhz u g q g i g i g (a rm s ) q g (kvar) u g (kv p ) 10 100 1000 10 000 0.1 1 10 100 0.1 1 10 100 fre q uency (mhz) 1.93 mhz 1.11 mhz u g q g i g i g (a rm s ) q g (kvar) u g (kv p ) 10 100 1000 10 000 0.1 1 10 100 0.01 0.1 1 10 fre q uency (mhz) 0.90 mhz 0.52 mhz u g q g i g i g (a rm s ) q g (kvar) u g (kv p )
twif 085175, twif 085215, twif 085260 www.vishay.com vishay draloric revision: 11-may-16 4 document number: 22166 for technical questions, contact: powcap@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 guidelines electrical data and guidelines ? the main physical and electrical characteristics of the capacito rs and ceramic materials used, ar e listed in the tables on the general section and in the individual datasheets. ? the continuous limit values of voltage, current, and power given in the diagrams must be observed. ? the rated voltage given in the tables is th e peak value of the sinusoidal ac voltage or the sum of the dc and peak ac voltages for which the capacitor is rated under continuous operation. ? the rated current in the tables is the effective value of th e sinusoidal current for which the current paths of the capacitor are designed. installation ? watercooled pot capacitors (twif 085175, twif 085215, twif 08526 0) are designed to be installed in a vertical position, connection fittings of the watercooling system upside. for large generators requiring multiple capacitors we recommended a circular mounting pattern for optimum circuit performance. ? when capacitors are connected in parallel, care should be take n to mount the top electrodes of the capacitor away from the rf bus bar to minimize the effects of st ray electromagnetic fields. the capacitors elements must not exceed a temperature of more than +100 c. ? the electrical connection to the inner electrode must be flexible in order to prevent the generation of physical forces which could damage the capacitor elements. such forces are often generated by the dimensional di fferences resulting from the normal physical tolerances of the capacitors. the capacitors inner electrode connector must not be used as a mechanical support for other devices or components. cooling ? the cooling system is designed to operate at a maximum water pressure of 4 bars (58 psi). ? the position of water inlet and outlet is designed to be installed in a vertical position, connection fitt ings of the watercoo ling system top-side. this allows an y air to escape from the unit. ? the minimum water flow rates sp ecified in the tables must be observed. when us ing antifreeze mixtures, the flow rate should be increased by at least 20 %. ? the cooling system is designed to have a water temperature increa se of < 10 c (water inlet to water outlet) when the capacito r is operated at full rated power and the minimum water flow rate. a water in take temperature of ? 30 c is recommended. if the cooling system of several capacitors is connected in series, the intake temperature of the coolant must not exceed 50 c for any capacitors. ? the pressure drop in a series connected c ooling system is small. the table below illu strates the effects up on water flow rates as a function of the number of series connected typical watercooled capacitors in the system with a constant intake water pressure of 3 bars (43.5 psi). ? intake water temperature fluctuations in excess of 3 c/s must be avoided to prevent damage to the capacitor elements. ? a coolant temperature rate monitor must provide a fail-safe on / off power control for the rf equipment. ? normal tap water or de-mineralized wa ter may be used for cooling. the wate r must be reasonably free of ca co 3 and clear of foreign particles or milkyness. the ph-v alue of the coolant should between 6 and 8. number of cooling systems in series 1 2 3 4 water flow rate (liter s/minute) 13.0 10.5 8.5 7.3 water flow rate (us-gal. /minute) 3.43 2.77 2.24 1.92
twif 085175, twif 085215, twif 085260 www.vishay.com vishay draloric revision: 11-may-16 5 document number: 22166 for technical questions, contact: powcap@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 quality and reliability electrical and mechanical screening tests all capacitors are subjected to th e following tests prior to shipment ? capacitance value (1.0 mhz or 0.1 mhz, 20 v rms , 25 c 5 c) ? dissipation factor (1.0 mhz or 0.3 mhz, 10 v rms , 25 c 5 c) ? insulation resistance (100 v dc , 25 c 5 c) ? dielectric strength (200 % rated peak voltage, 50 hz, 5 minutes) ? rf power test (140 % to 180 % rated power for 10 minutes in a te st generator circuit) ? pressure test (standard: 6 bars [8 7 psi] for 1 minute, 25 c 5 c) warranty stipulation fo r watercooled ceramic power rf capacitors ? unless otherwise provided for herein after, warranty sha ll be governed by general te rms of sale and delivery. ? warranty is assumed for capacito rs which fail to operate owing to faults in ma terial or production, and within the warranty period for capacitors. ? excluded from warranty are capacitors prematurely rendered uns erviceable owing to improper trea tment, overloading, circuit errors, as well as capacitors operated without observing the da ta given in our catalogue. warranty is also excluded in cases where faults can no longer be recognized on the capacitor owing to third party interferences. warranty is only effectively assumed when meeting the requirem ents referred to hereinafter. ? for claiming warranty, the defective capaci tor should be returned to us, if possible in its original packing, within 14 days following the data of failure, being accompanied by the complete ly filled-in and signed original guarantee certificate. the risks of transportation, as well as any shipping costs and other charges shall in any ca se be borne by the sender. ? warranty can only become effective if the defective capacitor is received by us in the same condition as it was when it happened to fail. ? we have the right to inspect any records proving the use of the capacitor. ? the decision as to whether we are obliged to assume wa rranty for the capacitor sha ll exclusively rest with us. ? when acknowledging the warranty claim, any non-repairable ca pacitor shall remain our proper ty. when refusing a warranty claim the defective capacitor will be returned at the customers expense only if demanded so explicitly when asserting the warranty claim. in case examination requ ired disassembly of the capa citor no claims for damage can be derived therefrom. ? the customer gives us the right to have the syst em checked in which the capacitor was operated. ? when acknowledging a warranty clai m, restitution is made by su pplying either a repaired and newly tested capacitor or by supplying a new one. ? warranty shall only extend to the capacitor itse lf. any further claims for damages are excluded. conditions of guarantee pursuant to the foregoing stipulations we assume warranty for these watercooled pot capacitors up to a period of 5000 hours of operating service. any claims for warranty, however will extinguish 24 mo nths following the date of delivery. related documents general in formation www.vishay.com/doc?22071
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