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Three-phase capacitors

Three-phase capacitors

Product catalog summary

Overview: This document outlines the technical specifications and guidelines for LPC three-phase low voltage power capacitors, which are used for reactive power factor correction in industrial networks.

Specifications:

Voltage Range: 400V to 525V
Power Range: 1 kVAr to 50 kVAr
Discharge Time: ≤ 3 minutes to 75V
Connection Type: Delta
Mounting: Vertical use only, with ground fixation

Features:

Self-Healing: Utilizes metallized polypropylene film to prevent short circuits by evaporating metal around breakdown points.
Overpressure Disconnection System: Protects against overvoltage and high temperatures by disconnecting internal connections when overpressure is detected.
Discharge Resistor: Ensures safe discharge of capacitors to 75V within 3 minutes, complying with EN-60831-1/2 standards.

Construction:

Manufactured with low loss metallized self-healing polypropylene film.
Filled with non-toxic polyurethane resin for heat dissipation.
Available with faston connectors for up to 5 kVAr and screw terminals for higher ratings.

Technical Data:

Standards: IEC 60831-1/2, EN 60831-1/2
Capacitance Tolerance: -5% to +10%
Temperature Range: -25°C to +55°C
Dielectric Losses: ≤ 0.2 W/kVAr
Total Losses: ≤ 0.45 W/kVAr
Protection: IP 20, indoor mounting

Applications: Suitable for reactive power factor correction of inductive consumers such as transformers, electric motors, and fluorescent lamps, either individually or in automatic capacitor banks.

Additional Components:

Extra discharge resistors available for faster discharge.

Tables and Charts:

Detailed tables provide specifications for various capacitor models, including rated power, capacitance, current, dimensions, and terminal types.
Charts illustrate the relationship between capacitor power and working voltage, as well as power factor correction requirements.

Specifications and Calculations:

Three-phase Capacitor Power: The power of a three-phase capacitor with a detuning reactor is calculated using specific formulas. For example, for 3 x 331.5μF at 400V/50Hz with a filtering factor (p) of 7%, the power is 53.8 kVAr. Without a detuning reactor, it is 50 kVAr.
Resonant Frequency and Filtering Factor: For a system with 25 kVAr at 400V and p = 0.07 at 50 Hz, the resonant frequency (fr) is 189 Hz, with a phase current of 36 A for 25 kVAr at 400V.
Power Factor Calculation: The document mentions the calculation of the power factor (cos φ), but details are not provided.

Fuse Selection:

For a capacitor power (Qc) of 25 kVAr and a main voltage (Umain) of 400V, the rated current (In) is calculated as 1.6 times the phase current, resulting in 63A. The rated voltage of the fuse (Un) should be at least 690V.

Key Parameters:

V = Rated voltage (V)
I = Rated current (A)
fn = Line frequency (Hz)
fr = Resonance frequency (Hz)
p = Filtering factor
Qc = Capacitor power (VAr)
C = Capacitance (F, farad)
P = Active power (W)
S = Apparent power (VA)
Q = Reactive Power (VAr)
In = Rated current of fuse (A)
Un = Rated voltage of fuse (V)

Additional Notes: The document provides examples and formulas for calculating various electrical parameters related to three-phase capacitors and their components.

Catalog excerpts

Three Phase Capacitors Three phase low voltage power capacitors LPC LPC 10..50 kVAr → Equipped with discharge resistors (Discharge time ≤ 3 minutes to 75 V) → Capacitors 1 ... 5 kVar connected with a double FASTON connector Included protection cover for electrical parts) → 10 ... 50 kVar capacitor terminals with universal screws (for slot "flat" screwdriver + Allen key "Imbus") → Overpressure disconnection system → rated power range: 1kVAr to 50kVAr → Rated voltage range: 400, 440 460, 480, 525 V → Ground fixation with thread, for vertica

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Three Phase Capacitors APPLICATION The LPC capacitors are used for reactive power factor correction of inductive consumers (transformers, electric motors, rectifiers, fluorescent lamps and many others in industrial networks) individually or assembled into automatic capacitor banks. DELTA CONNECTION DESCRIPTION R R S T LPC capacitors are manufactured with low loss metallized self-healing S T polypropylene film. Dry type capacitors are filled with a non-toxic an Ic ecological polyurethane resin, this resin provides an excellent heat dissipation properties. This capacitors are mounted in aluminium...

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Three phase low voltage power capacitors LPC

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Three phase low voltage power capacitors LPC

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£TIThree Phase Capacitors ■- Technical data Standards -5% +10% 50Hz (60Hz upon request) -25°C ... +55°C* <0.2 W/kVAr <0.45 W/kVAr 1,1 x Un 1,5 x In 2% 25% Incorporated; < 3 min to 75V Delta Aluminium case Overpressure Metalized polypropylene film, self-healing 2,15 x In 2 sec. 3KV for 10 second. AC Connector 200 x In IP 20, indoor mounting Max 95% 120.000 Hrs. (Temp. level C) Max. 2000 above sea level Capacitance tolerance Frequency Temperature range Dielectric losses Total losses Maximum over voltage Maximum over current Max. THD in voltage Max. THD in current Discharge resistance Connection Casing Disconnection...

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Three Phase Capacitors Extra discharge resistors for fast and secure discharge of capacitors LPC EDR 1K8, 10W 004656798 1K8 10 30 To connect extra discharge resistors, 2 auxiliary contacts NC on capacitor duty contactor must be used Set of 2 extra discharge resistors for fast and secure discharge of capacitors Type Code No. Resistance Power Weight Packaging [ohm] [W] [g] [pcs] 200 Extra discharge resistors 1K8 10W with auxiliary NC contacts (capacitor empty in less then 5s) Integrated discharge resistors already included with capacitor for slow discharge (≤3min to 75V demand by IEC 60831 - 1/2)...

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Three Phase Capacitors Capacitor working power depends on working voltage where: Ue - mains voltage; Un - capacitor rated voltage Qc - capacitor power at rated voltage Qf - capacitor actual power

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Three-phase capacitor power with detuning reactor in series Example: 3 x331.5pFat 400V/50Hzat p = 7% 0.0003315 • 3 • 400 2 • 314.16 / 1 - 0.07 = 53.8 kVAr The resonant frequency (fr) and filtering Phase current of capacitor: factor (p) in systems with compensation filters: (l=V^3 0^ = 1 Example: 25 kVAr at 400V Example: for p = 0.07 at 50 Hz; fr = 189 Hz 25000 / (400 • 1.73) = 36 A The calculation of the power factor cos <p: S v 1 + tin y ___ Fuse selection (gG): In=1,6*I For Umain=400V, Un=min. 690V V = Rated voltage (V) I = Rated current (A) fn = Line frequency (Hz) fr = Resonance...

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Three-phase capacitors

Three-phase capacitors

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