GSR-ST-12000VT-2S
Starter-generator
Description
GSR-ST-12000VT-2S starter-generator
GSR-ST-12000VT-2S is a DC starter-generator identified by its complete model and series suffix. The unit belongs to the GSR-ST-12000VT family, combining an electric starting function with power generation in one machine. The suffix 2S is retained because it identifies the listed execution; it is not replaced by a generic family name. Reference information for the base generator is available in the MiG-21MF maintenance manual, while series-specific acceptance limits require the documentation for the 2S execution.
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Documented family application on MiG-21MF
In the MiG-21MF family-reference installation, the generator is the main DC source, with two 15SC-45B batteries operating in parallel during normal service. The batteries provide reserve power when the main source is unavailable. The generator is described as a continuous-duty machine. This arrangement combines a mechanically driven main source with electrochemical energy storage, giving the DC network distinct normal and reserve power paths.
Voltage regulation and network protection
In the documented base installation, RUG-82 regulates voltage and TS-9M provides stabilization. VS-20 is the external resistance, AZP-1MA protects against overvoltage, and DMR-400T is the differential-minimum relay associated with connecting the source to the network. These devices describe the generator's electrical environment rather than items supplied inside its housing. They also explain why a generator is assessed together with its regulation and switching equipment, not only by nominal power.
GSR-ST-12000VT-2S and the brush assembly
The catalogue includes the separately listed 555.126 carbon brush associated with this generator execution. Brushes transfer current between rotating and stationary parts through the commutator. Contact condition affects current collection, while the brush drawing and material designation identify the required maintenance component. The replaceable brush and the complete starter-generator are therefore separate items in the electrical-equipment catalogue; their part numbers identify different levels of the assembly.
Technical reference and related generators
The base-family reference covers voltage, load current, power, shaft speed and continuous operation. It is kept in a clearly labelled group so that the scope of the figures is visible when reading the card. Other DC machines are listed in the generators and starter-generators category. The neutral MiG-21 overview provides general aircraft background without implying interchangeability between generator variants.
Technical details
The following electrical ratings and system components are reference data for the base GSR-ST-12000VT in the MiG-21MF maintenance manual, which does not specify the 2S suffix. They are not series-2S acceptance limits.
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Machine type: DC starter-generator
Listed execution: GSR-ST-12000VT-2S
Base-family aircraft reference: MiG-21MF
Base generator voltage: 28.5 V
Base generator load current: 400 A
Base generator power: 12 kW
Base generator shaft speed: 4,200–9,000 rpm
Base generator duty: Continuous
Voltage regulator in base installation: RUG-82
Stabilizing transformer in base installation: TS-9M
External resistance in base installation: VS-20
Overvoltage protection in base installation: AZP-1MA
Differential-minimum relay in base installation: DMR-400T
Reserve source in base installation: Two 15SC-45B batteries
Normal battery connection in base installation: Parallel with the generator
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