Suppressor film capacitor Highlight and Application in Series with the main
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1 Suppressor film capacitor Highlight and Application in Series with the main April 2007 Paola Bettacchi - Product Manager 1
2 Film capacitor : main features and performances Process flow charts Self-healing and corona effect International Standards Application in series/parallel with the main 2
3 FILM CAPACITORS GENERAL INFORMATION MAIN CAPACITORS PARAMETER SYMBOLS Theoretical capacitor symbol REAL CAPACITOR equivalent circuit LS ESR IR Z Real capacitor Theoretical capacitor Z = Impedance [Ohm] C LS = Total series due to the armature and the leads of the capacitor ESR = Total series resistance due to armature, to the leads and to the connection IR = Insulation resistance C = Capacitance frequency LS = LL + LW (LL = Inductance of the leads ; LW = Inductance of winding) ESR = RL + RC + RW (RL = Resistance of leads ; RC = Resistance of contacts ; RW = Resistance of winding) IR Infinite LS zero ESR zero THEORETICAL QUALITY OF CAPACITORS 3
4 ELECTRICAL CHARACTERISTICS AND PERFORMANCES FOR DIFFERENT FILM CAPACITORS PolyEthylene Terephthalate PET (MKT) PolyPropylene PP (MKP) PolyEthylene Naphthalate PEN (MKN) PolyPhenylene Sulfide PPS Metallized YES YES YES YES Dielectric constant Minimum thickness 1µm 2,8µm 1.4µm 1.2µm Working temperature 125 C 105 C (125 C for particular PP) 125 C 140 C Tand (1kHz) (typical) 50 x x x x 10-4 Behaviour vs frequency MEDIUM GOOD MEDIUM GOOD Tolerance (standard) ± 5% to 10% ± 2.5% to ± 20% ±10% ± 2% to ± 10% Stability ± 3% ± 0.5% ± 3% ± 0.5% Self-healing properties MEDIUM GOOD MEDIUM LOW 4
5 PROCESS FLOW CHART Raw Material Procurement Winding Flattening Masking Metallization Spraying Demasking Clearing Wire Weldings Resin Filling Box Insertion Electrical Testing Marking Packaging 5
6 SELF - HEALING Product Management Capacitors with metallized Polypropylene film have excellent self-healing properties, compared to other film capacitors or other capacitor technologies (impregnated paper, ). This property allows the use of thin dielectric materials; capacitors made with Polyester base film, metal-foil electrodes, impregnated paper caps, must always be designed with a safety margin to avoid a possible permanent short circuit in case of dielectric breakdown. 3 3 Metal layer < 0.02µm 4 Dielectric: 1µm Metallized film capacitors: the metal layer is very thin and, in case of dielectric breakdown, the energy released by the arc discharge in the breakdown channel is sufficient to totally evaporate the thin metal coating close to the channel. This results in insulation restoring and a small capacitance drop. Metallized film capacitors Breakdown 4 Breakdown channel Metallized coating (black colour) Metal is evaporated Result of breakdown: Metallization is evaporated (insulation restored) The advantages of single metallized film are the following: - smaller size (thinner electrode and dielectric) - higher capacitance value (thinner electrode and dielectric) - higher reliability (self-healing in case of dielectric breakdown) - lower cost (smaller size) - lower weight (smaller size) 6
7 CORONA EFFECT (Air molecules ionization) Product Management plastic film dielectric Single metallized film MKP metal-sprayed contact layer Due to the contemporaneous presence of air inside the capacitor and Vac, internal surface discharges happen and cause the partial evaporation of internal metallization. This is the reason of the capacitance value decrease. During the manufacturing process, there are many phases oriented to the pulling out of the air between the film layers of the caps: winding flattening thermal treatment. Anyway a certain quantity of air remains inside the film capacitor layers. The environment humidity decrease the air dielectric strength and favourites the corona effect discharges. 7
8 Electronic Filter lay-out SUPPRESSOR CAPACITOR Power line L 1 CX CY equipment Product Management L 2 CY Every electronic / electrical equipment produce Radio Frequency Interferences (RFI). RFI emission coming from inside or outside the system can be the cause of equipment malfunctioning. (Electro Magnetic Susceptibility - EMS). National and International standards regulates the maximum permissible noise level. All suppressor capacitors have to be according with EN (IEC ) CLASS X CAPACITORS Class X capacitors will be divided into three sub-classes according to the peak voltage (Vp) of the impulses superimposed on the main voltage to which they may be subjected in service. Such impulses may arise from lightening strikes on outside lines, from switching in the equipment in which the capacitor is used. SUB-CLASS Vp APPLICATION Vp IMPULSE BEFORE ENDURANCE TEST X1 > 1.2kV 4.0kV High pulse application 4 4kV for C 1µ F ; kv for C > 1µ F C X2 2.5kV General purposes kV for C 1µ F ; kv for C > 1µ F C X3 1.2kV General purposes NONE 8
9 CLASS Y CAPACITORS SUPPRESSOR CAPACITOR (Cont d.) Class Y capacitors will be divided into four sub-classes according to the type of insulation which could be bridged in case of short circuit of the capacitor. SUB CLASS Y1 Y2 Y3 Y4 TYPE OF INSULATION BRIDGED Double or reinforced insulation Basic or supplementary insulation Basic or supplementary insulation Basic or supplementary insulation RATED VOLTAGE 500Vac 150Vac 300Vac 150Vac 250Vac < 150Vac Product Management Vp IMPULSE BEFORE ENDURANCE TEST 8kV 5kV NONE 2.5kV MAIN STANDARDS FOR RFI SUPPRESSION CAPACITORS EUROPE Reference Standard: EN (IEC ) U.S.A. Reference Standards: UL 1414 and UL 1283 UL 1414: Across-the-line Max capacitance value: 1µF Max operating temperature:+ 85 C Max voltage: 250Vac UL 1414 approval covers also UL 1283 approval (not viceversa) UL 1283: Electromagnetic Interference filters The UL 1283 approval can be requested also for capacitance values higher than 1µF, rated voltages higher than 250Vac and temperatures higher than + 85 C CANADA Reference Standard: CAN/CSA CAN/CSA : Across-the-line applications The CAN/CSA approval is identical to IEC It harmonizes and can be requested also for capacitance values higher than 1µF, temperatures higher than 85 C and voltages higher than 250Vac. CHINA Reference Standard: GB/IT
10 WHERE TO USE SUPPRESSOR CAPACITORS? The X2 metallized film capacitor is designed to withstand all International Standards. Power line L 1 L 2 CX The X2 metallized film capacitor is designed to filter spikes in parallel with the main. Power line L2 L1 The use of X2 metallized film capacitor is not recommended for any other application different than suppression in parallel with the main, like position in serial with the main and general decoupling. 10
11 WHERE TO USE SUPPRESSOR CAPACITORS? The suppressor cap is designed to work in parallel with the main at low frequency (50/60 Hz). The suppressor capacitor is supposed to withstand high peak voltage values through all its life and then it must have high performances of self-healing. In International Standards don t care about suppressor capacitance change in severe ambient conditions. For all the above reasons, X2 is recommended for circuit position in parallel with the main. 11
12 CAPACITORS IN SERIES / PARALLEL WITH THE MAIN 12
13 CAPACITORS IN SERIES / PARALLEL WITH THE MAIN 13
14 R752 and R75L performances Product Management Surge test: applied on the leads of the capacitor 1700Vpeak 1.2us/50us 5 pulses each phase. 14
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