Combined instrument transformers
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Combined instrument transformers Outdoor operation Oil-paper insulated EJOF (24 -170) kV Current and voltage - our passion

General description Combined instrument transformers type EJOF are used in high voltage networks within the 24  –170 kV range. They transform high voltage and high current into standardised values for meters, measuring and protection devices. The inner construction of a combined instrument transformer is similar to the construction of the current and voltage transformer. The current transformer is located in the head and the voltage transformer in the bottom housing of the combined instrument transformer. The fine graded bushings are inside the insulator. The high voltage insulation is...

Design Expansion bellows Bellows cover with oil expansion indicator Lifting lugs Housing with drainage area Primary connection CT part with iron cores, secondary windings and high voltage insulation Primary changeover Porcelain or silicone composite insulator Colour coated housings and flanges Fuses or miniature circuit breakers (MCBs) with or without auxiliary contacts in the terminal box Surge arrestors and spark gaps 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...

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

Easy primary changeover Excellent protection against moisture ■ A clear and easy primary changeover with a ratio of 1:2 or 1:2:4 is available. ■ The primary changeover is adjusted with one metal plate at one side of the head only. ■ No need to dismount or move the primary connections during adjustment. ■ The inner side of the instrument transformer is protected against moisture by means of special sealing rings. ■ 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...

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...