SU1610543A1 - System for controlling electric starter of gas-turbine engine - Google Patents

Abstract

This invention relates to electrical engineering, in particular to electrical starting systems. The purpose of the invention is to increase the reliability of the launch system by reducing the switching power and eliminating the overheating of the electric starter. The system contains two batteries, contactors for switching them in the gas turbine engine starting mode, a starting resistor, a start button, a contactors control unit and a device for alternately switching the batteries to start the electric starter. The system provides a three-stage launch. The start of the electric starter under ambient temperature conditions occurs from two batteries, switched as they start from parallel connection to series one. In case of elevated temperatures, the electric starter is fed alternately from each of the batteries, evenly discharged. The system prevents the electric starter from overheating and reduces the power switched by the contacts during start-up. 2 Il.

Description

The invention relates to electrical industry, in particular to systems for the electrical start of gas turbine engines (GTE).

The purpose of the invention is to understand the reliability of the launch system by reducing the switched power and eliminating overheating of the electric starter.

FIG. 1 is a diagram of an electric starter control system for launching a GGD; in fig. 2 is an example of a specific implementation of the trigger.

The system contains batteries -1 and 2, the plus terminals of which are connected by the contacts 3 of the contactor 4, and the minus terminals by the contacts 5 of the contactor 6, the contacts 7 of the contactor 4 and the contacts 8 of the contactor 6 are connected in series AND are included in the diagonal between the positive terminal of the battery 1 and mt battery terminal 2, electric starter 9, connected to batteries m 1 and 2 through contacts 10 of contactor 11, starting resistor 12, connected to electric starter 9 through contacts of blackout contactor 14, start button 15 , block 16 yniiai; sd 4;

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contactors with time relays 17–19 and pins 20–25, switching device 26, including trigger 27 with clock input 28, switching with contacts 30, battery temperature sensor 31 with closing contacts 32, and diode 33. Output FOR trigger 27 is connected to the relay coil 29. Clock input 28 of trigger 27 through contacts 32 is connected to the start button 15 .:

FIG. 2 shows an example of a specific implementation of the trigger 27, which contains a polarized relay 35 with contacts 36, a relay 37 with contacts 38 and 39, a relay 40 with contacts 41 and A2 and separation diodes 43 and 44.

The system works as follows

At an ambient temperature corresponding to the minimum starting temperature, contacts 32, of temperature sensor 31 are open.

After the contacts of the start button 15 are closed, the time delay control unit 16 closes contacts 20 and 21. At the same time, the contactor 14 power supply circuit closes. The latter is activated by connecting contacts 13 of the start re: 3stistor 12 to the electric starter 9 (first start level).

After the holding time of the first start stage, the control unit 16 closes contacts 22 and 23, and the power circuit of the contactor winding 11 closes, the latter operates and contacts 10 connects the electric starter 9 to parallel connected batteries m 1 and 2 (second start stage)

After the time of the second stage start-up, the control unit 16 closes the contacts 24 and 25, while the supply circuits of the windings of the contactors 4 and 6 are closed. These contactors are activated and the contacts of the batteries 1 and 2 are connected to the batteries. connection on the serial (third run level).

After a certain time or according to a signal from the rotor speed sensor of the engine, control unit 16 opens Contacts 21-25, the start-up is stopped, and the system returns to the initial state.

When the ambient temperature and, consequently, the temperature of the batteries up to the trading 3Ha4ejwH determined by the current-voltage characteristics of the batteries and the starter characteristics of the starting system, the temperature sensor 31 closes the contacts 32.

In this case, the system works as follows.

When the contacts of the button 15 are closed

starting voltage supplied

through the closed contacts 32 of the sensor 31 to the clock input 28 of the trigger 27 and then through the opening of the contacts 36 of the relay 35 and the contacts 41 of the relay 40 - to the winding of the relay 37. The specified relay is activated and becomes self-grip using the closing contacts 38. The power supply to turn on the coil of the polarized relay and to the output 34 of the trigger 27. Relay 35 operates and switches contacts 36. However, the relay 40 does not work, because the power supply circuit or its windings are broken by the break contacts 39 R-37. output 34 trigger 27 voltage power is supplied to the coil of the switching relay 29 is also triggered. In this case, the supply voltage through the contacts 32 of the thermal sensor 31, the diode 33, the closing contacts 30 of the relay 29 is applied to the winding of the contactor 4. The latter is activated and the breaking contacts 3 disconnects the battery 1 from the starter circuit. Therefore, in the first and second stages of start-up, electric starter 9 is powered only by one battery 2. The system operates at the third stage of start-up in a manner similar to that described.

When the contacts of the start button 15 are opened, the system returns to the initial state. However, the polarized relay 35 of the trigger 27 remains in the on state, since in order to turn it off it is necessary to apply a voltage to the disconnecting winding.

During the start-up operation, the trigger 40 relay 40 is activated. Close the contacts 42 of the specified relay supply voltage to the tripping winding of the relay 35. Then it turns off and the contacts 36 return to their original position, the relay 29

power supply voltage is not included

across the circuit: closed cochlocks 32 of temperature sensor 31, diode 33, opening contacts 30 of relay 29, is applied to the winding of contactor 6, which triggers and

opening contacts 5 disconnects battery 2 from the starter circuit. In the first and second stages of start-up, the electric starter 9 is powered by the battery 1.

Thus, the trigger 27 and the relay 29 provide alternating switching on of the batteries 1 and 2 and their uniform discharge at elevated ambient temperatures.

The maximum starting current in the proposed system at the second start-up stage is approximately 1.5 times lower than the maximum starting current in the known system. The power consumed from the power source is also reduced. At the same time, the starting system torque at the starting frequency is greater than the minimum required torque.

The proposed starting system at positive temperatures provides power to the electric starter at start-up from one of the batteries with alternation of the latter, prevents the starter and wires from overheating and leads to a decrease in the power switched by the system contactors at start-up.

Claims (1)

Invention Formula An electric starter control system for starting a gas turbine engine containing battery batteries, the positive terminals of which are connected th bos aae10 15 20 25 thirty 35 between the opening contacts of the first contactor and the negative terminals to the opening contacts of the second contactor, the closing contacts of both contactors are connected in series and included in the diagonal between the positive terminal of the first battery and the negative terminal of the second battery, an electric starter connected to the battery, on the battery of the third contactor, the starting resistor connected to the electric starter through the contacts of the fourth contactor, the start button connected between the two A yusovaya terminal of one of the batteries and a control unit for contactors, characterized in that, in order to increase reliability by reducing switching power and eliminating overheating of the electric starter, the system is additionally equipped with a device for alternately switching the first and second contactors, made in the form of a trigger, a switching relay and battery temperature sensor with closing contacts, while the trigger trigger input is connected to the start button output via the temperature sensor contacts, the trigger output is dsoedinen to the relay winding mykayu1f different 1st-contact which is connected to the second contactor closes 1D1y - the first contactor, and the common contact of the relay via a diode coupled to the contact temgseratury sensor. Fi & .1 FIG. 2