SU1737609A1 - Device for protection of engine-generator system against excess of rotational speed - Google Patents

Abstract

Use: reliable and high-speed protection of the engine, for example, a diesel turbine, operating on a generator against excessive rotational speed. Summary of the invention: when the engine shaft speed is greater than the set speed and the speed of change of the rotational speed is greater than zero, the comparators 5, 6 are triggered, which causes the trigger 12 to be set to state 1. The trigger 12 generates an enable signal for the operation of the analog-digital converter (ADC) 13, to turn off the automatic air circuit breaker (ABB), to start the emergency diesel generator (ADG) and to allow the connection of consumer groups through blocks 4 logical multiplication. Multiplication unit 4 determines the necessary power to prevent separation. 1 il.

Description

The invention relates to electrical engineering and is intended to protect an engine, (e.g., a diesel turbine) operating a generator.

A known system comprising direct current motors operating at a constant load and connected to the load by kinematic gears with elastic elements, each motor having separation units of the first and second derivatives.

A device is known that contains an emergency shut-down spool of a turbine guide, a threshold element, two over-speed sensors, an AND element, a release element.

The closest in technical essence is a device containing a pulse shaper, the frequency of which is proportional to the frequency of rotation of the shaft, a trigger with a counting input, a logic repeater with an action delay on the leading edge of the input signal, a single vibrator, a two-input element I.

The disadvantage of this device, as well as analogs, is a relatively low speed and reliability in operation, which is not ensured, for example, in the event of a malfunction of the diesel fuel equipment.

The purpose of the invention is to increase the speed and reliability of the device.

This is achieved by the fact that in a device containing a generator, a rotational speed measurement unit, an input connected to a generator and a first output connected to a derivative measurement unit, and VIV

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eye and third outputs - respectively to the first input of the multiplication unit and the input of the first comparator. The first and second outputs of the derivative measurement unit are connected to the second input of the multiplication unit and the input of the second comparator, and its output is the first input of the first comparison unit. The second input of the first comparison unit is used in series through the first input of the second comparison unit and the first output of the converter connected to the generator input, and through the second input of the second comparison unit and the memory unit input to the second output of the converter. The output of the first and second comparators are connected to the inputs of the first element I, the output of which is the S input of the trigger, and its R input is a reset command to other devices, the output of the trigger is connected to the C output of the ADC with dynamic compensation, to the first outputs N element And through a serially connected amplifier - to lock the automatic air switch of the generator (ABB), to start the emergency diesel generator (ADG). The output of the ADC is connected to the first input of the adder and the first input of the RAM, the output of the RAM is connected to the second input of the adder, and the input of the ADC is connected via a serially connected diode to the output of the first comparison unit. The output of the adder is connected to the input of the register, and its input is connected to the second inputs of the element I, which are connected via amplifiers to their load contacts via their outputs. AC output I The count end is connected to a frequency divider, the first output of which is connected to the C input of the s / mmator, and the second to the C input of the RAM, register and memory block.

Such a constructive solution allows avoiding emergency operation of the engine.

The significance of differences in the device is achieved by the fact that it allows an increase in the load on the engine due to free consumers, which means the moment of resistance, therefore, to stop the separation. It is these significant differences that increase the reliability and speed of the device.

The drawing shows a diagram of the device.

The device includes a generator 1, a rotational speed measurement unit 2, an input connected to the generator input and the first output of the derivative measurement unit 3, and a second and third output to the first input of the multiplication unit 4, to the first input of the first comparator 5, the second input of which is L / e rotation frequency value. The first and second inputs of the derivative measurement unit are connected to the second input of the multiplication unit and to the input of the second comparator 6, and

the third input of the multiplication unit is the coefficient K, and its output is the first input of the first comparison unit 7. The second input of the first comparison unit 7 is the serially connected first input of the second comparison unit 8 and the first input of the converter 9 connected to the input of the generator 1, and through the second input the second comparison unit 8 and the input of the memory unit 10 to the second input of the converter 9.

The input of the first and second comparators 5,

6 are connected to the inputs of the first element 11, the output of which is the S input of trigger 12, and its R input is a reset command to other devices. Trigger input

12 is connected to the C-input of the ADC 13 with dynamic compensation, to the first outputs of the element And 14 and through the serially connected amplifier 15 to the ABB blocking and triggering the ADG. The output of the ADC 13 is connected

to the input of the adder 16 and the first input of the RAM 17, the output of which is connected to the second input of the adder 16, and the input of the FPA 13 through the diode 18 to the output of the first comparison unit 7. The output of the adder 16 is connected to the input of the register 19, and its output is connected to the second inputs of the And 14 element, which are connected through the amplifier 20 to the load contacts via their outputs. The output of the ADC 13 End of the account is connected to the divider 21 frequency

the first output of which is connected to the C input of the adder 16, and the second to the C inputs of the RAM 17, register 19 and memory block 10. .

The device works as follows.

When the engine shaft rotation frequency W is greater than L / O and the speed of rotation speed change W is greater than zero, the comparators 5, 6 are triggered, which sets the trigger 12 to the state of logical one. The trigger 12 generates a permitting signal for the operation of the ADC 13, for disconnecting the ABB, starting the ADH, and for enabling the connection of consumer groups through the I 14 element.

The signal of multiplier 4 is compared in the first comparison block 7 with the signal from the second comparison block 3 AP, at the initial time the output signal of the second comparison block is zero. The input signal of the first block 7 comparison through the diode 13, preventing the disconnection of redundant consumers (when R A P) is fed to the input of the ADC 13, in which

the presence of the enable signal of the trigger 12 will be connected M groups of consumers of electricity. The A / D converter 13 also generates a signal for the End of Counting, which is fed to a frequency divider 21, which is necessary for synchronization of the operation of the adder 16, RAM 17, register 19, memory block 10. The synchronization signal to the memory block is needed to update the power information on generator tires after each connection of consumer groups.

Synchronization of the adder 16, RAM 17, register 19 occurs as follows. First, the signal from ADC 13 and RAM 17 in the adder 16 is summed, and then the pulse from the second output of frequency divider 21 is overwritten by rewriting the state of RAM 17 and the contents of the adder 16 are written to the register 19. Thus, with new consumers connected, RAM 17 stores previous information. Frequency divider 21 is required to delay the time between connecting consumer groups. The signal from the outputs of the register 19 is fed to the element And 14, controls the connection of contacts, ensuring the connection of the required power.

The device allows to increase the reliability of the engine in operation and reduce the response time to 50 ms,

Claims (1)

Invention Formula A motor-generator system protection device against engine rotational speed, containing a rotational speed measurement unit with leads to be connected to a system generator, the first And element and the actuator, characterized in that, in order to improve the speed and reliability of the device in operation, And is made in the form of N elements And, the first output of the rotational frequency measurement unit is connected to the input of the entered measurement block of the derivative, and the second and third outputs are connected to the first input of the inserted block multiply and to the input of the entered first comparator, respectively, the first and second outputs of the measurement block of the derivative are connected to the second input of the multiplication block and the input of the entered second comparator, the output of the multiplication block is connected to the first input of the entered first comparison block, the second input of which is connected to the output of the entered second block comparison, the first input of which is connected to the output of the inserted block, the first input of which and the second input of the second comparison block are connected to the terminals for connection to the generator outputs of the converter system, the output of the first and second comparators are connected to the inputs of the entered second element And whose output is connected to S-input RS-flip-flop, and its R-input-to the terminal command reset other devices, the output RS-flip-flop is connected to the C-input of the input analog-digital converter (ADC) with dynamic compensation, to the first the inputs of the N-elements I and through the amplifier to the terminal for connection with the interlock of the automatic air circuit breaker (ABB) of the generator and the start of the emergency diesel generator (ADH), the output of the ADC is connected to the first input of the input the adder and the first input of the input memory unit (RAM), the output of which is connected to the second input of the adder, and the ADC input through the input diode is connected to the output of the first comparison unit, the output of the adder is connected to the input of the input register, the output of which is connected to the second inputs of the N-elements And The outputs of which are connected to the executive body, made in the form of contactors for electrical consumers with amplifiers at the input, in addition, the output of the ADC. The end of the account is connected to the entered frequency divider, the first output of which connected to the C input of the adder, and the second to the C input RAM, register and the second input of the memory block. Ljlj NJ - . h " TSM-3 ъ Sg F / / V f / CNS x 1 f 1o g