Neutral-Forming Oil Filters for 6-10 kV Systems (FNP-6-10 kV) for Electrical Network Applications

Three-phase oil neutral-forming connection filters of FNPM type with natural oil cooling are designed for creation of artificial neutral point in three-phase electric network 6-35 kV and connection of high-voltage earthing devices (arc suppression 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 The primary winding of the filter is made according to the connection scheme "zigzag with the withdrawn neutral" ZN, so the FNPM filters have less resistance to zero sequence currents and are more preferable than transformers with the connection scheme Yo/?, used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. FNPM 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.