Inductive voltage transformers Outdoor operation Oil-paper insulated EOF (24 -245) kV Current and voltage - our passion

General description Voltage transformers type EOF are used in high voltage networks within the 24  –245 kV range. They transform high voltage into standardised values for meters, measuring and protection devices. The active part of the voltage transformer is located in the foot housing. The high voltage insulation is implemented in oil-paper technology. To achieve this, a high quality PCBfree mineral oil is used. The fine graded bushing is inside the insulator. The expansion system is located in the head of the voltage transformer. This unit acts as volume compensation for the oil in case of...

Design Primary connection Expansion bellows Bellows cover with oil expansion indicator Porcelain or silicone composite insulator Possible options Colour coated housings and flanges Fuses or miniature circuit breakers (MCBs) with or without auxiliary contacts in the terminal box Pressure monitoring with auxiliary contacts Sealable cover on terminals for billing purposes Tan δ terminal for capacitance and di-electric dissipation factor measurement Sealable oil drain valve Primary coil with high voltage insulation Lifting lugs Housing with drainage area Secondary coil Main earth

* with standard composite silicone insulator, creepage distance 25 mm/kV

Fine graded bushing Excellent protection against moisture The fine graded bushing is designed to ensure an optimum distribution of the electric field. The inner side of the instrument transformer is protected against moisture by means of special sealing rings. The bushing is fixed in a way, that it is short-circuit-safe and secondary arcs are prevented. All housings are designed with a drain-age area to protect the sealing surfaces of the housings against rain. This significantly reduces crevice corrosion. The housing elements are connected with special stainless steel screws. They are designed...

PFIFFNER Instr. Transformers Ltd 5042 Hirschthal Switzerland ® +41 (0)62 7392828 PFIFFNER Technologie Ltd 5042 Hirschthal Switzerland ® +41 (0)62 7392828 PFIFFNER Systems Ltd 4303 Kaiseraugst Switzerland ® +41 (0)61 4676111 PFIFFNER Deutschland GmbH 25524 Itzehoe Germany ® +49 (0)48 21408270 PFIFFNER Transformator A.S. 06750 Akyurt/Ankara Turkey ® +90(0)31 28475521 PFIFFNER do Brasil Ltda 88307-740 Itajai Brazil ® +55 (0)47 33481700 MGC Moser-Glaser Ltd 4303 Kaiseraugst Switzerland ® +41 (0)614676111 ALPHA Elektrotechnik Ltd 2560 Nidau Switzerland ® +41 (0)32 3328700 This document has been drawn...