Capacitors Capacitor
Todays deals on Capacitors Capacitor?
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IET / General Radio 1408 Air Bath Reference Standard Capacitor $17,995.00 |
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Capacitor Bank 480V 3Ph, 60Hz, 50Kvar Mfg: ABB, NEW, Complete Specs Available $5,500.00 |
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HUGE LOT of 123,450 Capacitors Nippon United Chemi-Con Aluminum Radial ** NEW ** $5,485.00 |
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IET Labs/General Radio 1413 Precision Decade Capacitor $5,479.99 |
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CAPACITOR * MX-6066 / ARC-105 522-3336-005 (Rockwell) $4,500.00 |
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10Kx SIEMENS B33063 18700PF +/-2% 160V P CAPACITOR $4,500.00 |
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Aerovox 425 KVAR Power Factor Correction Capacitor – E317 $4,500.00 |
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P5026 decade capacitance box capacitor standard analog General Radio,GenRad, IET $4,260.00 |
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Eldre Philips High Voltage A21509 Capacitor Bus Bar $3,995.00 |
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ABB SAFUB 800F500 AC DRIVE CAPACITOR ASSEMBLY 500V $3,894.99 |
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10Kx SIEMENS B33063 27000PF +/-2.5% 160 V P CAPACITOR $3,800.00 |
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ARX-X100 S21/S22 PA Capacitor Assembly (Exchange Only) $3,250.00 |
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10000x SIEMENS B33063 4640 PF +/-2.5% 160V P CAPACITOR $3,200.00 |
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INDRAMAT AC SERVO CAPACITOR TCM 2.1-02-7 $3,150.00 |
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10000x SIEMENS B33063 2000 PF +/-2.5% 160V P CAPACITOR $3,000.00 |
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General Radio 1422-MD Precision Capacitor 1050 & 105 pF $2,999.95 |
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10000x SIEMENS B33063 5620 PF +/-2% 160 V P CAPACITOR $2,900.00 |
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10000x SIEMENS B33063 4700 PF +/-2.5% 160V P CAPACITOR $2,850.00 |
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10Kx MiaL 611-3 4700PF +/-3% 160 V PP CAPACITOR AXIAL $2,800.00 |
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(400 pcs) AVX TPSE107K016R0100 100uF/16V Tantalum Capacitor $2,500.00 |
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Aerovox 225 KVAR Power Factor Correction Capacitor – E318 $2,500.00 |
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7200 Kemet Ceramic Chip Capacitors C1210N104K5XSC __J35 $2,499.99 |
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ESI SC1000 Standard Capacitor 1 NanoFarad Calibrator *Tested* $2,046.87 |
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ALLEN BRADLEY BRIDGE FAN & CAPACITOR 2361-SPH01B *NSFP* $1,999.00 |
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10000x SIEMENS B33063 1000 PF +/-2.5% 160V P CAPACITOR $1,950.00 |
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10Kx MiaL 611-3 3900PF +/-10% 160 V PP CAPACITOR AXIAL $1,800.00 |
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10000 PCS 10UF 16V B 3528-21 SMD Tantalum capacitor 106 $1,799.99 |
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(6) NOS! COOPER PWR SYS 200 KVAR CAPACITOR CEP145B4-FB $1,795.00 |
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LOT 21k NICHICON VX(M) 100uF 63V Electrolytic Capacitor $1,699.99 |
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6700x SPRAGUE 10UF 16VDC 20% TANTALUM CAPACITOR RADIAL $1,675.00 |
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NEW ALUM ELECT CAPACITORS SCREW TERMINAL 80V 22000uF LNR1K223MSM NICHICON JAPAN $1,600.00 |
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NEW-Qty 4 Reels @ 400ea-1600pcs Kemet Tantalum Capacitor 220uf 16v 10% SMD SMT $1,599.99 |
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General Radio GenRad GR 1403 K N R G D A Standard Air Capacitor Set $1,595.00 |
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3 unit Magnetizer & Fluxmeter, Magnetic Instrumentation Capacitor Discharge SCR $1,507.23 |
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RIIMIC SUNAIR VARIABLE CAPACITOR 6035080707 JENNINGS $1,500.00 |
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Aerovox 200 KVAR Power Factor Correction Capacitor – E331 $1,500.00 |
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General Electric DC Filter Capacitors $1,500.00 |
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Mil-Spec Capacitor Component Lot Raytheon Surplus $17k $1,499.95 |
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**NEW** FANUC A06B-6083-H245 CAPACITOR MODULE A06B6083H245 $1,465.00 |
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Allen Bradley 150-a180nbd 150hp w/ overload ,capacitor $1,460.00 |
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500,NEW 22X45 450V 100UF Axial Electrolytic Capacitor $1,458.00 |
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CUTLER HAMMER/CH/ # 6 MOTOR STARTER W/CAPACITOR $1,450.00 |
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BOSCH POWER SUPPLY (CAPACITOR BANG) KM 2200-T $1,350.00 |
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CONDENSER CAPACITOR RF 4500 FGL 68-110 UN14KV $1,300.00 |
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GE Fanuc A06B-6083-H218 CAPACITOR MOD $1,299.00 |
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Maxwell/General Atomics PN: 33944 130 uF 22 kV High Voltage Capacitor $1,249.99 |
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GE CAPACITORS 65L835TE1 NSFP 65L835TE1 $1,242.00 |
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GENERIC CAPACITOR CR47000U25 FNFP CR47000U25 $1,235.10 |
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300p Marcon 63V 15000UF Electrolytic Capacitor 35X51NEW $1,228.00 |
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300p Marcon 63V 15000UF Electrolytic Capacitor 35X51NEW $1,228.00 |
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300p Marcon 63V 15000UF Electrolytic Capacitor 35X51NEW $1,228.00 |
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General Electric 17L641TH Capacitor NEW $1,212.77 |
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10000 AVX TPSR106M006S1000 CAPACITOR TANT 10UF 6.3V 1OH $1,199.99 |
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4000 – C1206C102F1GAC 100v 1000pF C0G 1% Capacitor Rohs $1,199.00 |
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GE 37F0523416 CAPACITOR 150KVAR 4160V (PALLET OF 2) ***NEW*** $1,199.00 |
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NEW KEMET Part# T340C475K040AS7301 Capacitor 1K PC REEL $1,199.00 |
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10KxMURATA DE1110-834 MX601M 600PF 125VAC 20% CAPACITOR $1,100.00 |
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NEW ABB CNI4000480S148 CAPACITOR 400KVAR 4800V 46.1UF 30204 $1,100.00 |
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KEMET T340B155M035AS7301 Capacitor 1533 pc Lot – NEW $1,100.00 |
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GenRad 1425A Standard Decade Capacitor Tested 1425-A $1,095.00 |
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P5025 Decade capacitance box capacitor standard analog General Radio,GenRad, IET $1,070.00 |
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Square D SQ D PFC2020 Var-Gard Power Factor Capacitor $1,061.99 |
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General Radio GR 1404-A 1000pF Primary Reference Standard Capacitor (S/N 2591) $1,000.00 |
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General Radio Company 1409-Y HLG Standard Capacitor $1,000.00 |
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Sencore LC103 Capacitor & Inductor Analyzer-Tested-Guaranteed Working! $999.99 |
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Fanuc A06B-6083-H218 Capacitor Module $999.99 |
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Cornell Dubilier NRG Low Inductance Capacitor 60.8 MFD $999.99 |
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Cornell Dubilier NRG Low Inductance Capacitor 62 MFD $999.99 |
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Whaolesale Lot Mil-Spec Resistor and Capacitors from Raytheon $999.95 |
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AVX CK06BX105K, 1.0uF, ±10%, 50V, capacitors, lot/1000 $999.95 |
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1000uf /35 V / 105C capacitors, 30pcs $999.00 |
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GE 19L-735NH3/19L735NH3 CAPACITOR 320VDC 200-200- ***NNB*** $999.00 |
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Lot of Panasonic Digi-Key Capacitors Over 125 Pieces $999.00 |
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NEW KEMET Part# T340C475K040AS7301 Capacitor 823 PCS $999.00 |
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KEMET Part# T340C685M035AS7301 Capacitor 1000 pc Reel $999.00 |
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PACK600,450V 47UF 22X40 Axial Electrolytic Capacitor $999.00 |
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GR General Radio 1412-BC decade capacitor, NIST-cal’d $995.00 |
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Automatic Bulk capacitor cutting machine $995.00 |
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Sencore LC102 Capacitor – Inductor Analizer $979.30 |
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WESTINGHOUSE DYNA-VAC CAPACITORS 2400V, CLASS3-B $950.00 |
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GE Capacitor 19L618KH1 300KVAR 1250V 2.0KHZ 1PH $950.00 |
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1000x USSR Military Capacitors K40Y-9 0.1uF 400V Paper + Oil K40Y9 PiO RARE $949.99 |
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Sencore LC102 and SCR 250 Capacitor Inductor Analizer $929.00 |
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Lot of 5650 NOVACAP 1210Z334Z250NTM 330nF Capacitor $904.00 |
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ASEA BROWN BOVERI FILM-VAR CAPACITOR 1N03300A08F $900.00 |
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HV High Voltage High Power Capacitor 3mF+-10% 12kVDC $900.00 |
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TH2617B Capacitor Capacitance Tester Meter 100KHz 0.1% $899.99 |
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TH2617B Capacitor Capacitance Tester Meter 100KHz 0.1% $899.99 |
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ABB Capacitor C485D40-2LF, 40.0 KVAR #28615 $899.00 |
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NEW ABB Capacitor C485D40-2LF, 40.0 KVAR #28603 $899.00 |
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GE 19L-591RH3/19L591RH3 CAPACITOR 1000 KVAR 800V ***NIB*** $899.00 |
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GE 19L-541RA1/19L541RA1 CAPACITOR 900 KVAR 800V ***NIB*** $899.00 |
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GE 19L-825TH4/19L825TH4 CAPACITOR 900VDC 1620UF ***NNB*** $899.00 |
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1000 ELUM 33uF 450V AXIAL DL-8 Electrolytic Capacitor $890.00 |
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1000 ELUM 33uF 450V AXIAL DL-8 Electrolytic Capacitor $890.00 |
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TH2617B Capacitor Capacitance Tester Meter 100KHz 0.1% $888.00 |
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2000 PCS 47UF 16V D 7343-31 SMD Tantalum capacitor 476C $877.99 |
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POWERTEC 141-106 CAPACITOR BOARD ***XLNT*** $870.00 |
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Comet Variable Capacitor CV05C-1000M/5 working 1000pF $851.11 |
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Variable capacitor 50-2300 pf 15 kV Jennings made in USA $850.00 |
Capacitors Capacitor Questions
Super Capacitors
One of the most critical aspects of an uninterruptible power supply (UPS) is its standby or back-up battery system, where super capacitors are now beginning to play a role.
A super capacitor resembles a regular capacitor except that it offers high capacitance in a small package. Energy storage is by means of static charge rather than an electro-chemical process, inherent in lead-acid uninterruptible power supply batteries. Applying a voltage differential on the positive and negative plates charges the super capacitor (this concept is similar to an electrical charge that builds up when walking on a carpet).
Their design makes them ideal for small uninterruptible power supply installations whereby they are being utilised in favour of a battery set or to reduce the potential for battery discharge during momentary mains power failures.
The amount of energy that can be stored depends upon the active material used in the design of a super capacitor. Potentially, it can achieve up to 30kW of stored energy.
A super capacitor (also referred to as electric double layer capacitor, electrochemical double layer capacitor or ultra capacitor) consists of two electrodes constructed from a highly activated carbon material, which may be woven. Whereas a regular capacitor consists of conductive foils and a dry separator, the super capacitor crosses into battery technology by using special electrodes and some electrolyte. There are three types of electrode materials suitable for the super capacitor: high surface area activated carbons, metal oxide and conducting polymers. The high surface electrode material, also called Double Layer Capacitor (DLC), is least costly to manufacture and is the most common. It stores the energy in the double layer formed near the carbon electrode surface.
The carbon activated electrodes provide a large reticulated area upon which an active material such as Ruthenium Oxide is deposited. The material provides an enormous area, for example, 1000 square meters per gram of material used. Cellulose paper with polymeric fibers to provide reinforcement is typically used as the separator between the electrodes. Electrolyte is usually diluted Sulphuric Acid. Ruthenium Oxide is converted into Ruthenium Hydroxide by a chemical reaction and this enables energy to be stored.
To operate at higher voltages, super capacitors are connected in series. On a string of more than three capacitors, voltage balancing is required to prevent any cell from reaching over-voltage.
Energy within a super capacitor is quickly available – and this is one of its greatest advantages. When coupled to an existing battery set, they can inhibit battery cycling for momentary interruptions, which helps extend the working life of the set. A super capacitor’s working life is typically ten years (double that of an average UPS battery). They can also operate over a wide temperature range (minus 30 to 45 degrees centigrade).
Other Advantages
- Virtually unlimited cycle life – can be cycled millions of times.
- Low impedance – enhances load handling when put in paralleled with a battery.
- Rapid charging –super capacitors charge in seconds.
- Simple charge methods – no full-charge detection is needed; no danger of overcharge.
Limitations
- Linear discharge voltage prevents use of the full energy spectrum.
- Low energy density – typically holds one-fifth to one-tenth the energy of an electrochemical battery.
- Cells have low voltages – serial connections are needed to obtain higher voltages. Voltage balancing is required if more than three capacitors are connected in series.
- High self-discharge – the rate is considerably higher than that of an electrochemical battery.
Whereas the electro-chemical battery delivers a steady voltage in the usable energy spectrum, the voltage of the super capacitor is linear and drops evenly from full voltage to zero volts. Because of this, it is unable to deliver the full charge. If, for example, a 6V battery is allowed to discharge to 4.5V before the equipment cuts off, the super capacitor reaches that threshold within the first quarter of the discharge cycle. The remaining energy slips into an unusable voltage range. A DC-to-DC converter could correct this problem but such a regulator would add costs and introduce a 10 to 15 percent efficiency loss.
The charge time of a super capacitor is about 10 seconds. The ability to absorb energy is, to a large extent, limited by the size of the charger. The charge characteristics are similar to those of an electrochemical battery. The initial charge is very rapid; the topping charge takes extra time. Provision must be made to limit current when charging an empty super capacitor.
In terms of charging method, the super capacitor resembles the lead-acid battery. Full charge occurs when a set voltage limit is reached. But unlike the electrochemical battery, the super capacitor does not require a full-charge detection circuit. Super capacitors take as much energy as needed. When full, they stop accepting charge. There is no danger of overcharge or ‘memory’.
Super capacitors are relatively expensive in terms of cost per watt. Some design engineers argue that the money would be better spent providing a larger battery by adding extra cells. But the super capacitor and chemical battery are not necessarily in competition. They enhance one another.
About the Author
Robin Koffler is the General Manager for Riello UPS Ltd the UK subsidiary of Riello UPS (RPS S.p.A) a leading European manufacturer of Uninterruptible Power Supplies and a co-author of The Power Protection Guide(ISBN 978-0-9554428-0-3)- available from Amazon.com
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