TF1-150/1A

TF1-150/1A current transformer for aircraft AC systems

TF1-150/1A is an aircraft current transformer used in onboard AC electrical systems. The unit converts high primary current into a lower measuring current suitable for cockpit instruments and monitoring circuits. It is typically used where aircraft electrical load must be controlled through an AC ammeter. The transformer is a measuring component, not a protection relay or power converter. Its function is to provide a proportional secondary current for indication of load in aircraft AC networks.

Current conversion through TF1-150/1A

The transformer operates with a one-turn primary winding of pass-through type. The controlled conductor acts as the primary circuit, while the secondary winding supplies the measuring current to the associated indicator. This allows high current in the aircraft power line to be monitored without feeding the full current directly through the cockpit instrument. The rated secondary output is intended for instruments calibrated for this transformer ratio, so the transformer and ammeter should be selected as a matched measuring pair.

TF1-150/1A with AF1-150 ammeter

TF1-150/1A is commonly used with the AF1-150 aircraft AC ammeter. In this configuration, the transformer reduces the measured current to the required secondary value, and the ammeter displays the load on the aircraft electrical system. The pair is used in AC networks with aircraft-standard frequency, including 400 Hz systems. If the indicated current is incorrect, the check should include the transformer, ammeter, wiring, secondary circuit continuity, grounding and the load circuit being measured.

Aircraft application of TF1-150/1A

The transformer is used in Soviet and Russian aircraft electrical equipment, including helicopters and fixed-wing aircraft. Typical applications include Mi-8, Mi-17, Mi-26, An-24, An-26 and Tu-154M platforms, depending on the installed electrical system. Exact applicability depends on the aircraft modification, generator system, ammeter type and wiring arrangement. Similar current transformers may differ by primary current rating, secondary current, frequency range or mounting dimensions, so replacement must be confirmed through documentation.

Identification and ordering of TF1-150/1A

Before ordering, the full designation should be checked against the aircraft parts catalog, electrical system documentation or product passport. It is important to confirm the primary current range, secondary current, frequency range, mounting dimensions and associated ammeter type. For correct selection, provide the aircraft type, electrical system application, existing transformer marking and a photo of the unit if available. The product is also known under alternative designations TF1-150/1A, TF1-150 and ТФ1-150/1А.

Product Type: Aircraft current transformer
Function: Conversion of high AC current into measuring current for aircraft instruments
Application / Where Used: Aircraft onboard AC electrical systems
System / Installation Area: AC generator / load monitoring and ammeter measuring circuits
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-26, An-24, An-26, Tu-154M, depending on configuration
Associated Instrument: AF1-150 aircraft AC ammeter
Primary Current Range: 0–150 A
Number of Primary Ampere-Turns: 150
Number of Primary Winding Turns: 1
Rated Secondary Current: 1 A
Rated Frequency: 400 Hz
Operating Frequency Range: 350–1200 Hz
Current Error: Not more than 0.5%
Angular Error: 40 min
Operating Temperature Range: −60 to +150 °C
Short-Time Ambient Temperature Resistance: Up to +400 °C
Humidity Resistance: Up to 98% at +40 °C
Overall Dimensions: 95 × 75 × 32 mm
Weight: 0.325 kg
Alternative Designations: TF1-150/1A; TF1-150; ТФ1-150/1А
Technical Documentation: Product passport and aircraft electrical system documentation available upon request

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Extended warranty is available upon request and is agreed individually; it may affect the final product price.