B / AR / QSRB / AST capacitor banks for reactive power compensation
Country: France · Model: B / AR / QSRB / AST
Capacitor banks for reactive power compensation are intended for 400 V, 50 Hz networks, with a 60 Hz version possible on request. The line includes automatic, fixed and fast thyristor-switched banks, including for networks with harmonics. They are installed at the plant input, in substations and workshop panels to reduce charges for reactive energy and relieve the transformer.
- Voltage
- 400 V, 50 Hz (60 Hz on request)
- Types
- automatic B25/B35/B50, AR140/AR180 (with anti-resonance reactors); fixed QSRB25/QSRB35; static thyristor-switched AST
- Protection degree
- IP30/IP40
- Capacitors
- self-healing, metallized polypropylene
Technical specifications
| Voltage | 400 V, 50 Hz (60 Hz on request) |
|---|---|
| Types | automatic B25/B35/B50, AR140/AR180 (with anti-resonance reactors); fixed QSRB25/QSRB35; static thyristor-switched AST |
| Protection degree | IP30/IP40 |
| Capacitors | self-healing, metallized polypropylene |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The automatic banks B25, B35 and B50 switch capacitor steps on a regulator signal according to the current cos φ. The AR140 and AR180 series are fitted with anti-resonance reactors, which protect capacitors from harmonic overload and prevent resonance with the network inductance. The fixed QSRB25 and QSRB35 compensate a constant reactive component, for example the no-load current of a transformer or a large motor. The static AST banks switch capacitors with thyristors without contacts, which is needed for rapidly varying loads such as welding or cranes. Capacitors of metallized polypropylene self-heal after a local breakdown. The cabinets have an IP30 or IP40 protection degree.
How to choose
The choice starts with the share of non-linear load. If the network has few frequency converters and rectifiers, ordinary automatic B25/B35/B50 are suitable. With noticeable harmonics AR140/AR180 with reactors are needed, and for rapidly varying loads the thyristor AST. The fixed QSRB25/QSRB35 is installed where reactive power hardly changes. When harmonics are strong, it is advisable to install an active filter alongside.
Request a price and lead time
B / AR / QSRB / AST capacitor banks for reactive power compensation. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What voltage are B and AR capacitor banks rated for?
For a 400 V, 50 Hz network, and a 60 Hz version is made on request.
Why do AR140 and AR180 banks have reactors?
Anti-resonance reactors shift the resonant frequency of the circuit below the harmonic frequencies, so the capacitors are not overloaded in networks with non-linear load.
When is the AST thyristor capacitor bank needed?
When the load changes within fractions of a second, for example during welding or motor starts. Thyristors switch the steps without current surges and contact wear.
What protection degree do B, AR and QSRB banks have?
The cabinets are made with IP30 or IP40 protection and are intended for closed electrical rooms.
What capacitors are used in AR and QSRB banks?
Self-healing capacitors of metallized polypropylene, which restore insulation after a local breakdown.
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Need a price, lead time or replacement?
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