Low voltage detuning filter

Main purpose and scope of application:
In a system containing a small amount of harmonic current, simple capacitor bank compensation is not feasible , because the capacitor bank and the network form a parallel resonance to amplify the harmonics, so that the voltage and current distortions are serious, so there is a problem. In a system with a small amount of harmonic current, a tuning reactor should be connected in series with the compensation capacitor bank, that is, each section of the capacitor bank is composed of a capacitor and a tuning reactor, and the series resonance frequency of this loop should be tuned lower than the lowest harmonic. It is capacitive at the fundamental frequency (50Hz) to provide reactive current to compensate the power factor, and inductive at the harmonic frequency to prevent the harmonic current generated by the parallel resonance from being amplified.
This product complies with: National Standard GB/T15576-2008 (our company is the main drafting unit of this standard).

Model and meaning

Working conditions
1. Altitude ≤2000m;
2. Ambient temperature -25°C~+45°C;
3. Relative humidity ≤90% (at 20°C);
4. There is no severe mechanical vibration at the installation site, no corrosive gas and steam , No conductive and explosive dust.

Main technical parameters
1. Applicable grid voltage: AC1000V and below, three-phase or single-phase;
2. Compensation capacity: 30-600kvar;
3. Compensation control sampling: reactive power;
4. Suitable compensation action mode: cycleswitchingor search Excellent
switching;5. String ≥6% reactors to suppress harmonic amplification above 5th order, string ≥12% reactors inhibit harmonic amplification above 3rd order.

Product features
1. The detuning filter device is mainly composed of four parts: intelligent controller, non-contact switch (AC contactor) series reactor, and capacitor. The intelligent controller samples the voltage and current of the system, calculates the instantaneous reactive power and compares it with the set reactive power switching threshold, and controls the non-contact switch or AC contactor to realize the capacitor input or removal.
2. The installation of the detuning filter device is similar to the ordinary capacitor cabinet. The current sampling should be taken from the total incoming cabinet current. For three-phase, the sampling of current and voltage is out-of-phase sampling, that is, if the bus current is taken from phase A, control The sampling voltage (working power supply) of the converter is the BC phase. The detuning filter device can work reliably in various harmonic environments. It uses pseudo-random digital sampling control to track and compensate the reactive power of the fundamental wave in real time.

Ordering instructions
1. Provide system harmonic data and load nature;
2. Compensation capacity, switching method, reactance rate;
3. Standard cabinets such as GGD, GCS, MNS, etc. in appearance specifications.