Turn regulation type arc extinguishing coil grounding compensation device, 10kv turn regulation type arc extinguishing coil set of details.

1、Grounding transformer (DKSC type)

(1) provide neutral point. General power grid main transformer 6 ~ 10kV side more △ wiring, no neutral point, if you want to install the arc extinguishing coil, shall use the high-voltage winding for Z-type connection grounding transformer to lead the neutral point. Arc extinguishing coil operation, detuning degree setting: detuning degree setting is directly related to the compensation effect of the system, such as improper settings, it is possible that after the disappearance of the fault grounding signal still has not disappeared, the regulator reflects the neutral displacement voltage is abnormally high, the system will run in resonance. Grounding transformer conforms to the national standard GB10229-88 "reactor" and Q/BTGO01-1999 "MRD-XHZ arc extinguishing coil grounding compensation device" specified technical indicators.

( 2) zero sequence impedance is small. z-type coupling grounding transformer zero sequence impedance of only a few ohms / phase, single-phase grounding 95% of the voltage added to the arc extinguishing coil, so that it has a fairly good compensation capacity. In recent years, some domestic manufacturers have developed automatic tracking compensation arc extinguishing device. It can automatically track the changes of the grid parameters, automatically measure the capacitance current, automatically adjust the compensation current, over-supply, under-supply can be run, the way is very flexible. It can better suppress arc grounding overvoltage, line breaking overvoltage and transmission overvoltage, etc. The tuning mode of the arc extinguishing coil can be divided into pre-tuning type and with the tuning type. According to the regulation method of the arc extinguishing coil reactance, it can be divided into electric on-load turning type, DC bias type, air gap adjustment type, capacitance adjustment type and so on.

(3) grounding transformer with secondary winding can be used for station change, a change of multi-purpose, saving investment.

(4) grounding transformer high voltage side in addition to the original three-phase unloaded tap and increase the unbalance adjustment gear (0.5%, 1%, 2%), used to adjust the grid asymmetric voltage, to meet the needs of automatic tuning.

(5) The secondary side of the grounding transformer is equipped with open triangle stabilizing winding, whose function is to absorb the third and above harmonics, facilitate the sampling of the system signal and eliminate the interference of harmonics to the sampling signal.