EJGF
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Combined instrument transformers Outdoor operation SF6-gas insulated EJGF (245 -550) kv Current and voltage - our passion

General description Type EJGF combined transformers are used in high-voltage substations within the 245 –550 kV range. They transfer high voltage and high current into standardised, equivalent values for meters, measuring and protection devices. The voltage transformer component is located in the top of the pressure-resistant head housing and the current transformer cores at the bottom. In the current transformer unit, the iron core is set to high-voltage potential and the secondary windings to earth potential. The current transformer cores are fitted in a protective core shell made of...

Design Metal rupture disc Lifting lugs Voltage transformer core Primary winding voltage transformer Desiccant (optional) Head housing Housing for secondary windings Primary terminal Primary changeover Current transformer Primary conductor Possible options Control electrode 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 Sealable cover on terminals for billing purposes Sealable gas filling valve Composite insulator Terminal box with rating plate Gas density...

Type EJGF Standard Highest voltage for equipment Rated power-frequency withstand voltage Rated lightning impulse withstand voltage Frequency Primary rated current Secondary rated current Rated short-time thermal current [Ith] Rated dynamic current [Idyn] Accuracy class CT part Accuracy class vT part Rated thermal limiting output vT part Max. simultaneous burden (cl. 0.2) Max. number of CT cores Max. number of vT windings Nominal operating / transport overpressure (20°C) bar Height to primary terminal* B mm 3375 3375 4730 4730 5090 5890 Depth of unit including terminal box C mm 845 845 1088...

Easy primary changeover ■■ 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 each side of the head only. Excellent protection against moisture ■■ 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. No need to dismount or move the primary connections during adjustment. ■■ The housing elements...

Global presence PFIFFNER Instr. Transformers Ltd 5042 Hirschthal Switzerland PFIFFNER Technologie Ltd 5042 Hirschthal Switzerland PFIFFNER Systems Ltd 4303 Kaiseraugst Switzerland PFIFFNER Deutschland GmbH 25524 Itzehoe Germany PFIFFNER Transformatör A.S. 06750 Akyurt /Ankara Turkey PFIFFNER do Brasil Ltda 88307-740 Itajaí Brazil MGC Moser-Glaser Ltd 4303 Kaiseraugst Switzerland ALPHA Elektrotechnik Ltd 2560 Nidau Switzerland This document has been drawn up with the utmost care. We cannot, however, guarantee that it is entirely complete, correct or up-to-date. ©Copyright PFIFFNER / Subject...