RU2271063C1 - Four-channel backup power supply system - Google Patents

Abstract

FIELD: aircraft engineering.

SUBSTANCE: proposed four-channel backup power supply system that can be used, for instance, in three-phase ac power system ensuring power supply to all pieces of equipment in case of failure of any of four channels, each of its channels incorporating generator and line contactor with make-and-break contacts, is assembled of three main and one backup channels; each main channel is provided with bus connected to generator through make contact of line contactor, external power supply connector, and second contactor with make-and-break contacts; backup channel is provided with second contactor incorporating make contact inserted between break contact of back-up channel line contactor and one of connectors; make contacts of second contactors of main channels are interconnected through connectors, their common leads are connected to break contacts of line contactors, and break contacts of second contactors are interconnected and connected to common lead of back-up channel line contactor. In this way preflight training is made using three airfield power supplies (and not four as in prior-art systems) and only one power supply is required for optimizing on-board pieces of equipment using minimal quantity of contactors.

EFFECT: reduced number of airfield power supplies required for optimizing on-board equipment and for preflight training.

1 cl, 2 dwg

Description

The present invention relates to aircraft electrical engineering and can be used, for example, in a four-channel power supply system (SES) of alternating three-phase current, which provides power to all equipment in case of failure of any one of the four channels.

A four-channel special SES for aircraft A is known, which provides power to the radio complex and its cooling systems in case of failure of any two generation channels ("Instructions for the technical operation of aircraft A").

The closest to the destination is a similar four-channel special SES of an AI airplane ("Instructions for the technical maintenance of an AI airplane"), which provides power to the radio complex and its cooling systems in the event of failure of any one generating channel. During normal operation, two channels are loaded with a load close to the nominal, and the other two are close to 50% of the rated power, which, in fact, ensures a power reserve.

If any one generating channel fails, the load of the generators loaded at 50% is combined and receives power from one generator, while the second generator is used as a backup. For ground testing and preflight preparation, four airfield power sources are required.

The disadvantages of such a system include the complication of the operation of aircraft carriers of powerful radio systems due to a significant increase in the number of ground handling facilities. Given that in addition to this, it is necessary to reconnect the airfield power source to service aircraft equipment powered by the main SES, air conditioning units, as well as special equipment, the pre-flight preparation of such aircraft results in a serious problem. The disadvantage should also include the need to take measures to ensure electromagnetic compatibility for two options for the distribution of load on the generator buses.

On the other hand, during the development of radio engineering complexes with the inclusion of such a number of airfield sources at minimum power, the option is desirable and desirable when it is possible to ensure the development of the complex from one airfield source. In the considered SES, to ensure this option, a significant complication of the scheme will be required.

The objective of the invention is to reduce the number of airfield sources used in the development of on-board equipment and preparation for flight.

The technical result is achieved by the fact that a four-channel redundant power supply system, each channel of which contains a generator and a linear contactor with switching contacts, is made in the form of three main and one backup channels, each of the main channels having a bus connected to the generator through the make contact of the linear contactor , a connector for connecting an external source and a second contactor with switching contacts, and the backup channel is equipped with a second contactor with a make contact m, connected between the opening contact of the line contactor of the backup channel and one of the connectors, while the closing contacts of the second contactors in the main channels are connected to the connectors, their common conclusions are connected to the opening contacts of the linear contactors, and the opening contacts of the second contactors are combined with each other and the common output of the linear contactor backup channel.

The invention is illustrated by drawings, where:

figure 1 presents the structural diagram of the SES;

figure 2 is a copy of the closest analogue.

SES contains three main generators 1, 2, 3, a backup generator 4, buses 5, 6, 7, connectors 8, 9, 10 for connecting an external (airfield) source, line contactors 11, 12, 13, 14 and contactors 15, 16 , 17, 18 to connect an external source.

During normal operation of the SES, linear contactors 11, 12, 13 and buses 5, 6, 7 are powered by the main generators 1, 2, 3. In case of failure of any of the main generators, its linear contactor is disconnected and the buses are de-energized. The backup generator 4 is connected to the buses of the failed generator after switching on the linear contactor 14 through the series-connected disconnecting contacts of the linear contactor of the failed generator and the corresponding contactor for connecting an external source.

When developing a radio complex with its full power on, all three airfield sources are used. They are connected to the buses of the main generators through connectors 8, 9, 10 with the help of contactors 15, 16, 17. When testing the complex with turning it on to minimum power, it is enough to connect the airfield source only to connector 10 and turn on the contactor 18, while the voltage from the airfield The source enters simultaneously the buses of all the main generators through the backup power line through the NC contact of the line contactor 14 and the NC contacts of the corresponding contactors connected in series (17-13, 16-12 and 15-11).

Overloading the backup generator in the event of failure of another generator can be prevented either by automatically turning off the backup generator by contactor 14, or by forcing the contactor to connect an external source in the second failed channel.

Preflight preparation from three airfield power sources (instead of four in known schemes) and the possibility of working out complexes from one source is provided with a minimum number of contactors.

Claims (1)

A four-channel redundant power supply system, each channel of which contains a generator and a linear contactor with switching contacts, characterized in that the system is made in the form of three main and one backup channels, each of the main channels having a bus connected to the generator through the make contact of the linear contactor, a connector for connecting an external source and a second contactor with switching contacts, and the backup channel is equipped with a second contactor with a make contact included between the opening contact of the line contactor of the backup channel and one of the connectors, while the closing contacts of the second contactors in the main channels are connected to the connectors, their common leads are connected to the opening contacts of the linear contactors, and the opening contacts of the second contactors are combined with each other and the common output of the linear contactor of the backup channel .

Images