SU1293747A1 - Device for indicating deviations of process parameters - Google Patents

Abstract

The invention relates to signal automation and can be used in systems for automatic control and protection of objects, in particular for alarm warning and pressure protection of diesel generator sets and power stations. The aim of the invention is to increase the accuracy and reliability of the device by ensuring the insensitivity of the device to shock. For this purpose, the control pulses of the trigger 10 are formed when the balance of the differential transformer 4 is at the time of changing the phase of its output voltage, and the command to turn on the operating element 1.4 passes- only when the core 3 of the sensor 1 enters the triggering zone as a result of the influence of the monitored parameter, and not the impacts. 2 Il. c (O (L

Description

ten

f5

The invention relates to signal automation and can be used in automatic control and protection systems for various objects, in particular for emergency warning and pressure protection of diesel generator sets and power plants.

The purpose of the invention is to improve the accuracy and reliability of the device.

FIG. 1 is a functional diagram of the device in FIG. 2 - diagrams on the operation of the device.

The device contains a sensor 1 made of a sensing element 2, for example a membrane, a core

3, differential transformer

4, push-pull generator 5 pulses, amplifier 6, driver 7, it has 20 pulses, elements 8 and 9, trigger

10, an integrator 11, a threshold element 12, an amplifier 13, an executive element 14.

The device works as follows

From the outputs of the push-pull generator 5 pulses, rectangular pulses are received at the input of elements And 8 and 9 of the differential transformer 4 (FIG. 2a, b), respectively. The voltage pulses of the corresponding phase (Fig. 2d, section 2), by the coincidence of the pulses at the output of the element And periodically with the frequency of the work of the push-pull generator 5 pulses are the pulses (fig. 2g), which switch the trigger 10, the voltage from the output of the trigger 10 is fed to the input of the integrator 11 of the element, the output of which is the voltage. After a certain time, when the voltage at the output of the integrator 11 reaches the trigger level of the threshold element 12 (Fig. 2i), it operates and through the amplifier 13 turns on the actuating element 14 (Fig. 2k).

To ensure shock insensitivity, the time constant of the integrator 11 is chosen so that it is longer than the shock duration. Thus, if, at the nominal value of the monitored parameter, as a result of the impact of shock loads, the sensitive element 2 and, as a result, the core 3 (at the moment of impact impact) enters the triggering zone, i.e. at the output of element 2, the pulses disappear, and at the output of element 8, pulses appear (dashed), which switch 25

an example; pressure, the output is differentiated by trigger trigger 10, and at its output by the social transformer 4, depending on the magnitude and direction of the imbalance, a voltage of a certain amplitude and phase is observed (Fig. 2., section 1). This voltage corresponds to the voltage of a certain phase at the output of the amplifier 6 (section 1, figure 2). When the pulses coincide at the output of the circuit element And 9 periodically with the frequency of operation of the push-pull generator of 5 pulses, pulses appear (Fig. 2e), which do not include trigger 10 (Fig. 2h). As a result, the command to activate the actuator is not received. When the monitored parameter reaches an (emergency or pre-emergency) value at the output of the differential transformer 4, the voltage of another phase appears (FIG. 2g, section 2d), Amplifier 6 and pulse shaper 7 operate in a key mode, i.e. when don’t know

five

0

a negative imbalance at the output of the pulse generator 7 pulses the voltage pulses of the corresponding phase (Fig. 2e, section 2) abruptly appear. By the coincidence of the pulses at the output of the And element, pulses appear periodically with the frequency of operation of the push-pull generator 5 pulses ), which switch the trigger 10, the voltage from the output of the trigger 10 is fed to the input of the integrator 11 of the element, the output of which appears voltage. After a certain time, when the voltage at the output of the integrator 11 reaches the trigger level of the threshold element 12 (Fig. 2i), it operates and through the amplifier 13 turns on the actuating element 14 (Fig. 2k).

To ensure shock insensitivity, the time constant of the integrator 11 is chosen so that it is longer than the shock duration. Thus, if, at the nominal value of the monitored parameter, as a result of the impact of shock loads, the sensitive element 2 and, as a result, the core 3 (at the moment of impact impact) enters the triggering zone, i.e. at the output of element 2, the pulses disappear, and at the output of element 8, pulses appear (dashed), which switch 5

is the voltage that goes to the integrator 11. At its output, the voltage starts to increase, but when the impact ends, the impulses turn on, disappear, and at the output of element And 9, there are again off pulses that reset the trigger 10 to the initial one The state and the voltage at the output of the integrator 11 corresponding to the nominal mode of operation of the object, not reaching the trigger level of the threshold element 12, begin to decrease, the actuator 14 does not turn on falsely,

Claims (1)

Invention Formula A device for signaling the deviation of technological parameters, comprising a sensor made of an elastic sensitive element. connected to the core of a differential transformer, the first amplifier, the output of which is connected to the input of the actuating element, is a threshold element, characterized in that, in order to increase the accuracy and reliability of the device, two elements, a trigger, an integrator, a second amplifier, a pulse shaper, and a push pull, are introduced into it pulse generator, the first output of which is connected to the primary winding of a differential transformer, the secondary winding of which through serially connected second amplifier and pulse shaper connected to the first inputs of the first and second elements And, the outputs of which are connected respectively to the first and second inputs of the trigger, the output of which is connected through the serially connected integrator and threshold element to the input of the first amplifier pulses are connected to the second inputs of the first and second elements, respectively. but 6 S k - / lj finjTJV4JiruxrvrLruTj- "Ari" rir "jxf Editor E. Sligan Compiled by A. Zin'kova Tehred L. Oleinik Order 388/54 Circulation 544 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG. 2 Proofreader N. King Subscription