DeltaCap
Power capacitor, MKD series (B32304A), 480 V / 33 kvar · EPCOS AG / TDK Electronics
DeltaCap is the cost-effective capacitor line in the EPCOS / TDK Electronics power factor correction programme, built on the well-proven MKD technology with stacked windings and developed specifically for low-voltage compensation in industrial installations. Epkom holds one type from the series: MKD480-D-33.0, a three-phase delta-connected 33 kvar capacitor rated for 480 V. That rating is the one a 400 V detuned bank asks for, because the reactor in series with the step raises the voltage across the capacitor above the network voltage. Construction is a stacked metallized polypropylene winding impregnated with a semi-dry biodegradable soft resin in a cylindrical extruded aluminium can with a threaded stud on the base. Safety is the same two-part scheme as the rest of the range: a self-healing dielectric and an overpressure disconnector that takes the capacitor off the network at end of life, behind an isolated IP20 terminal.
Key Features
- 01480 V, 33 kvar, three-phase delta connection — the rating for a 400 V detuned capacitor step
- 02Long life expectancy up to 150 000 hours at temperature class −40/C
- 03High inrush current withstand ability: up to 200 × IN
- 04Low losses: dielectric < 0.2 W/kvar, total < 0.45 W/kvar
- 05Dual safety: self-healing technology plus overpressure disconnector
- 06Isolated IP20 terminal, screw terminal for up to 25 mm² cable
- 07Discharge resistor pre-mounted; compact aluminium can with M12 stud, maintenance-free
Applications
- Low Voltage Reactive Power Compensation SolutionsIn industrial and commercial facilities the reactive power balance can be upset both by inductive loads such as motors and transformers and by loads with a capacitive effect such as UPS systems, drives and long cable runs. This can disturb the reactive power balance, move the power factor away from the desired level, draw unnecessary current from the network, increase losses and incur reactive energy charges. Low voltage compensation systems hold the power factor at the desired level by providing compensation matched to the facility's inductive or capacitive reactive power demand. Where load changes are rapid, thyristor-switched systems are used to respond quickly to reactive power variation. In facilities where harmonics are present, compensation systems with harmonic filter reactors are applied to keep the capacitors from entering resonance with the network. A correctly engineered compensation system helps to avoid reactive energy charges, to use transformer and cable capacity more effectively, to reduce electrical losses and to improve system performance.
- Medium Voltage Reactive Power Compensation SolutionsMedium voltage compensation systems hold the power factor at the desired level in high-power industrial facilities by supplying the reactive power that inductive loads require within the plant itself. This reduces the reactive power drawn from the network, lowers electrical losses and makes more efficient use of existing system capacity. MV compensation systems can use fixed or automatically stepped capacitor banks according to the needs of the facility. Switching is carried out by vacuum contactors or circuit breakers, and the system is operated safely with appropriate protection and control equipment. Because every facility has a different network structure, load characteristic and reactive power demand, MV compensation systems are engineered specifically for the site rather than supplied as a standard solution. Capacitor rating, step structure, switching devices, the protection system and, where required, series reactors are determined from the measurement and engineering work carried out, producing a compensation system suited to the facility's operating conditions.
Technical Specifications
DeltaCap
| Type / ordering code | MKD480-D-33.0 / B32304A4332#0801 (# = A for the 3-terminal design with integrated resistor, B for the 6-terminal design with pluggable ceramic resistor) |
|---|---|
| Rated voltage VN | 480 V AC |
| Rated output QN | 33 kvar at 50 Hz |
| Rated current IN | 39.7 A at 50 Hz |
| Rated capacitance CR | 3 × 152 µF |
| Connection | Three-phase, delta (D) |
| Dimensions d × h / weight | 96 × 350 mm / 2.7 kg |
| Construction | Metallized polypropylene film, MKD technology with stacked windings, extruded aluminium can with stud |
| Impregnation | Biodegradable soft resin, semi-dry |
| Capacitance tolerance | −5 % / +10 % |
| Rated frequency | 50 / 60 Hz |
| Maximum permissible voltage Vmax | VN +10 % (8 h/day), +15 % (30 min/day), +20 % (5 min/day), +30 % (1 min/day) |
| Maximum permissible current Imax | Up to 1.3 × IN (up to 1.5 × IN including combined effects of harmonics, overvoltage and capacitance) |
| Inrush current IS | Up to 200 × IN |
| Losses | Dielectric < 0.2 W/kvar; total < 0.45 W/kvar (excluding discharge resistor) |
| Mean life expectancy tLD | Up to 150 000 h at temperature class −40/C; up to 115 000 h at temperature class −40/D |
| Number of switching operations | Max. 5000 per year to IEC 60831-1,2 |
| Ambient temperature | −40/D: max. +55 °C, 24 h mean +45 °C, 1 year mean +35 °C. −40/C: max. +50 °C, 24 h mean +40 °C, 1 year mean +30 °C. Lowest −40 °C |
| Voltage test terminal / terminal VTT | 2.15 × VN, AC, 2 s |
| Voltage test terminal / case VTC | 3000 V AC, 10 s |
| Safety | Self-healing technology, overpressure disconnector, maximum allowed fault current 10 000 A to UL 810 |
| Discharge device | Discharge resistor pre-mounted on the B32304 series |
| Terminals | Screw terminal, max. 25 mm² cable cross-section |
| Mounting and grounding | Upright; threaded M12 stud (10 Nm) |
| Enclosure | IP20 (B32304 series) |
| Cooling / humidity / altitude | Natural or forced / max. 95 % relative, non-condensing / max. 4000 m above sea level |
| Standards | IEC 60831-1,2; EN 60831-1,2; VDE approval |
Technical values are taken from the manufacturer's published documentation. Confirm against the current datasheet before ordering.
Downloads
Datasheets, manuals and technical documentation are available from the manufacturer's document centre, or on request from us.
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