Three-phase dry neutral-forming connection filters of FNPS type with natural air cooling are designed for creation of artificial neutral point in three-phase electric network 6-10 kV and connection of high-voltage earthing devices (arc-extinguishing reactors and earthing resistors) to it.
The primary winding of the filter is made according to the connection scheme "zigzag with the withdrawn neutral" ZN, so the FNPS filters have less resistance to zero sequence currents and are more preferable than transformers with the connection scheme Yo/?, used to form the neutral in medium voltage networks.
FNPS neutral-forming filters can be optionally produced with an additional secondary winding made according to Y or Yo circuit, which can be used to create an additional power supply for control devices.
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