TF1-25.50.100/1A

Current scaling through TF1-25.50.100/1A

The transformer provides current scaling for several selectable primary current ranges. Depending on the connection of the input bus or conductor, the measuring circuit can be configured for different current limits. This allows one transformer type to be used in circuits where the required measured current range differs by installation point. The secondary circuit supplies the associated ammeter with a standardized measuring current, so the transformer and indicator must match by current ratio and aircraft wiring diagram.

TF1-25.50.100/1A with AF1 ammeters

The transformer is normally used with aircraft AC ammeters of the AF1 series. In this arrangement, the transformer reduces the measured AC load to a secondary value suitable for the instrument, while the ammeter displays the current in the selected circuit. The system is intended for aircraft AC networks with aviation frequency, including 400 Hz installations. If the indication is incorrect, the check should include the transformer, ammeter, secondary circuit, bus connection, wiring and connector condition.

Aircraft application of TF1-25.50.100/1A

TF1-25.50.100/1A is used in electrical systems of Mi-8 / Mi-17 / Mi-171 family helicopters and related aircraft configurations, depending on the installed equipment. It may be used in generator load monitoring, feeder current control or other AC measuring circuits. Exact applicability depends on the aircraft modification, electrical panel layout and ammeter type. Similar transformers can differ by current range, secondary current and frequency rating, so replacement should be confirmed through the aircraft electrical documentation.

Identification and ordering of TF1-25.50.100/1A

Before ordering, the full marking should be checked carefully, including all current range values and the secondary current designation. In Russian documentation, the unit may be written as ТФ1-25,50,100/1А, while in English requests it is usually written as TF1-25.50.100/1A. For correct selection, provide the aircraft type, electrical system application, associated ammeter, existing transformer marking and a photo of the unit if available.