TR-100/2

TR-100/2 dual adjustable transformer in aircraft systems

The TR-100/2 is a dual-channel aircraft adjustable transformer used for stepwise regulation of AC voltage in onboard electrical systems. It operates from the aircraft 115 V AC power network and provides adjustable low-voltage output for connected consumers. The unit is intended for continuous operation in aviation power distribution, control, lighting and instrument circuits where two regulated transformer channels are required in one compact assembly.

Stepwise voltage regulation function of TR-100/2

The main function of the TR-100/2 is to provide discrete output voltage adjustment through predefined voltage steps. Each channel is rated as a separate 100 VA group, which allows the transformer to supply two regulated low-voltage circuits. This is useful where different consumers or duplicated lighting / control circuits require stable voltage adjustment. Correct step selection and proper connection are important, because the transformer directly affects the voltage level supplied to lamps, panels or other onboard equipment.

TR-100/2 in cockpit lighting and panel circuits

The TR-100/2 is often used in aircraft lighting circuits where adjustable AC voltage is needed for incandescent lamps, illuminated panels, cockpit consoles and instrument lighting. By changing the output voltage, the system can adjust brightness and provide a more suitable light level for crew operation. This is especially important in cockpit environments where lighting must remain readable without creating glare or disturbing night vision. In such circuits, the transformer works as part of the aircraft internal lighting control system.

Aircraft application of TR-100/2

The TR-100/2 is used in civil and military aircraft and helicopters of Soviet and Russian design. It is associated with onboard electrical equipment of Mi-8, Mi-26, Mi-171E, Yak-42, An-72, An-124 and other aircraft depending on configuration. In heavy helicopters and transport aircraft, it may be installed in power distribution or lighting-control circuits where 115 V / 400 Hz AC is available and a regulated low-voltage output is required.

TR-100/2 and TR-100 family

The TR-100/2 belongs to the same general family as the TR-100 adjustable transformer, but the “/2” version indicates a dual-channel arrangement. It should not be treated as automatically interchangeable with a single-channel TR-100 without checking the aircraft documentation. The exact requirement should be confirmed by designation, passport reference, wiring diagram, output step arrangement, mounting interface and system role. In procurement, both TR-100/2 and ТР-100/2 may appear as equivalent designations in English and Russian documents.

Electrical network compatibility of TR-100/2

The transformer is intended for operation in aircraft AC networks based on 115 V and elevated aviation frequency. Standard data gives 400 ±20 Hz for this unit, while some aircraft references may list a broader permissible supply-frequency range for related applications. For correct selection, the aircraft wiring diagram and equipment passport should be treated as the controlling references. The output steps must match the connected consumers, especially when the transformer is used for dimming or supply adjustment of lighting panels.

Construction and operating conditions of TR-100/2

The TR-100/2 is designed for continuous aircraft operation and compact installation in onboard electrical equipment areas. It must withstand vibration, temperature variation and long service periods typical for aviation electrical units. The transformer contains copper windings and non-ferrous metal components, and passport data may include precious-metal content. During inspection, technicians should check winding continuity, insulation resistance, output voltage on each step, current consumption, housing condition, terminals and signs of overheating.

Supply and inspection of TR-100/2

For procurement or replacement, the transformer should be specified by the full designation TR-100/2 / ТР-100/2. The passport reference 8Yu4.710.012 PS should be confirmed where required. The unit may be supplied new, from storage, repaired or serviceable depending on availability. Before installation, both channels should be tested under the required voltage-step settings, and the transformer should be matched with the aircraft electrical diagram, lighting circuit and installation documentation.

Product Type: Dual adjustable aircraft transformer
Designation: TR-100/2
Alternative Designation: ТР-100/2
Function: Stepwise AC voltage regulation for two low-voltage output channels
Application / Where Used: Aircraft onboard electrical systems, lighting-control systems, instrument and panel supply circuits
System / Installation Area: AC power distribution system, cockpit lighting circuits, illuminated panels and control equipment depending on aircraft configuration
Nominal Power: 100 VA × 2 channels
Supply Voltage: 115 V +5 / −7 V
Alternative Input Tolerance Reference: 115 V ±6 V depending on documentation
Operating Frequency: 400 ±20 Hz
Broader Frequency Reference: 380–1100 Hz in some aircraft equipment descriptions; verify by passport and aircraft documentation
Output Voltage Steps: 0; 2.7; 3.0; 3.3; 3.5; 3.8; 4.1; 4.4; 5.0; 5.5 V ±10%
Load Current: Not more than 16.7 A
Current Consumption: Not more than 1.1 A
Operating Mode: Continuous
Channel Arrangement: Two independently used regulated groups / windings, 100 VA each
Typical Consumers: Incandescent lamps, illuminated panels, cockpit consoles, instrument lighting and compatible low-voltage AC equipment
Compatible Aircraft / Equipment: Mi-8, Mi-26, Mi-171E, Yak-42, An-72, An-124 and other aircraft / helicopters depending on electrical-system configuration
Related Version: TR-100 single-channel adjustable transformer
Weight: Not more than 1.1 kg
Precious Metals Content: Silver approx. 2.21 g
Non-Ferrous Metals Content: Aluminum approx. 0.12 kg; copper approx. 0.22 kg
Scope of Supply: Not specified
Condition: New / from storage / repaired / serviceable depending on availability
Inspection / Testing: Winding continuity check, insulation resistance check, output voltage-step verification for both channels, current consumption check, housing and terminal inspection
Technical Documentation: Passport 8Yu4.710.012 PS and operational documentation as applicable

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