SU1521920A2 - Device for monitoring and protecting coal pumping unit - Google Patents

Abstract

The invention relates to pump engineering and allows for the expansion of functionality by providing control of the pump life. The signals from current and voltage sensors 1 and 6 enter the multiplier 8. The output signal, proportional to the power consumed by the electric motor (E) 5, is fed to the input of voltage-frequency converter (FC) 20 and through the comparator (K) 11 - to unit (B) 4 of control E 5. The signal from the output of the FNC 20 enters the counter (C) of 21 pulses, the signal at the output of which corresponds to the amount of generated electric power. In C 18, this signal is compared with a predetermined value and a difference signal is generated, which is identified with the actual value of the resource of the coal suction unit. When it is depleted, the signal "0" from the output of the C 18 enters the B 17 signaling and B 4 to block the switching on of the unit, which has exhausted its resource. 1 il.

Description

The invention relates to pumping.

The purpose of the invention is the expansion of the unk1, the ionic capabilities of the device by ensuring control of the operation of the pump.

The drawing shows a diagram of the device.

The control and protection device of the unit is equipped with a froKa sensor 1, a current comparator 2, a current setting device 3, the output of which is connected to the second input of a current comparator 2, a motor control unit k 5, a voltage sensor 6, a phase shift voltage unit 7 , multiplier 8, low-frequency filter 9, Correction block 10, active power JI comparator, unit 12 reference active power, three blocks 13–15 delayed-CI, OR-NOT 16 logical element and | block 17 alarm. Moreover, the current sensor 11 is connected to the first input of the current parator 2, the output of which is connected via a delay unit 15 to a second input of the signaling unit 17. The output of the latter is connected to the control unit 4 by the electric motor 5, the output of which is via the delay unit 14; connected to the second input of the OR-NOT 16 logic element; Voltage sensor 6 is connected via the phase shift voltage block 7 to the first input of the multiplier 8. Current sensor 1 is connected to the second input of the multiplier 8, which is serially connected to the low-frequency filter 9 and block 10 correction. The output of the latter is connected to the first input of the comparator P of the active power. The generator 12 of the reference active power is connected to the second input of the comparator 11 of the active power, the output of which is connected via the delay unit 13 to the first input of the ORI logic element, and the output of the latter is connected to the first input of block 17 alarms. In addition, the device is equipped with a comparison element, made in the form of a subtracting counter 18 and connected to it by the resource adjuster 19 and the device for controlling the energy consumed, including series-connected voltage converter 2 - frequency, pulse counter 21, and decoder 22. Converter 20 is connected to the output of low-pass filter 9, and

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The output of the Comparison Element is with the output of the signaling unit 17. The device also contains a large-scale divider 23, a switch 24, summing counters 25 and 26, decoders 27-30 and trigger 31, connected according to the scheme,

The device works as follows.

In the initial state (motor 5 is turned off) the signal from the current sensor is absent, therefore, there is no output signal of the multiplier 8. Active power comparator 11 is turned off and the signal O is received at the first input of the OR-NOT 16 element. The second input of the OR-NOT 16 element Signal 1 is received from motor control unit 4, 5. Consequently, the output signal of the element OR — NOT 16 is equal to O, and there is no signal at the first input of signaling unit 17. The current comparator 2 is turned off, and then there is no signal at the second input of the signaling unit I7. The third input of block 17 receives a signal corresponding to the current value of electric power consumption during operation of the unit, the fourth - the signal corresponding to the current value of the residual resource; on the fifth - there is no signal (if the resource is not exhausted), on the sixth - the signal corresponding to the specified resource value for a given coal suction unit.

When the unit is turned on, the device controls the starting mode of the electric motor 5, t, e, protects the unit in case of abnormal start mode (start of the braked motor, jamming of the rotor, etc, d,) and blocks the protection of active power for the duration of the working (specified) mode,

The motor 5 is turned on. A current signal comes from the current sensor 1 corresponding to the phase current of the motor 5 and causes the current comparator 2 to turn on, the threshold value of which is set by the current setpoint 3. At the output of the comparator 2, a signal appears, equal 1, which is fed to the input of the delay unit 15. The latter is designed to delay the arrival of the output signal of the current comparator 2 to the blocks 17 and 4 of the signaling of the motor control 5 in order to prevent the disconnection of the ag5152

Regatta with a normal start of the electric motor 5.

The time delay of the signal by the block 5, as well as the threshold value of the comparator 2 on, is set based on the condition of the starting mode of the electric motor 5. Under normal start of the electric motor 6, before the block 15 delays the current of the electric motor 5 decreases below the threshold of the comparator 2 current, which causes its signal output is equal to O, Then the signal at the second input of signaling unit 17 also remains equal to O.

In the event of an abnormal start of the electric motor 5 after the delay time of the block 15 has expired, the current compressor 2 is not turned off, since at its input a signal is above the turn-on threshold. Then the signal at the second input of block 17 is equal to l. In this case, unit 17 performs an audible alarm and a corresponding light indicator, indicating that the starting mode of the electric motor 5 is violated. The output signal of unit 17, equal to 1, goes to control unit 4, causing the motor 5 to turn off. Under normal starting mode of the electric motor 5, the device monitors for the output of the coal pump on the operating mode as follows.

The input of the phase shift unit 7 voltage from the voltage sensor receives a signal corresponding to the magnitude of the linear voltage of the power supply network of the motor 5. The phase voltage shift unit 7 is designed to shift the phase of the output signal relative to the input signal by 30 °. corresponding to the phase voltage of the mains. The output of block 7 and current sensor 1 is fed to the first and second inputs of multiplier 8, respectively, in order to obtain a signal corresponding to the total power consumed by the electric motor 5. The transceiver 8 signal goes to the input of the low-frequency filter 9, which selects the signal corresponding to active power (the sum of the losses of active power in the electric motor 5, the coal pump, and the active power expended in transporting the medium) driven by an electric motor 5, the output signal of the filter 9 low frequency pos920

stumbles into correction block 10, as well as through a large-scale divider 23 to the input of voltage-frequency converter 20.

Correction unit 10 is designed to select a signal corresponding to the active power expended only on transporting the medium. This makes it possible to reduce the error and improve the clarity of turning on the active power comparator 1i, the switch-on threshold of which is set by the setpoint 12 of the reference active power. When the operating mode is reached, the signal from the correction unit 10 exceeds the signal of the setting device 12, and the comparator 11 is turned on.

The output signal from the comparator 1I,

0 equal to 1, arrives at the first input of the element OR NOT 16 (the first block 13 of the delay delays the arrival of the output signal of the comparator 11 to the first input of the element OR NOT 16 only

5 in the case of the comparator disconnecting P). The second input of the element OR NOT 16 receives the output signal of the delay unit 14, which is designed to block the signal arriving at

0 the first input of the element OR NOT 16, at the time of exit to the operating mode. Therefore, during the time of reaching the operating mode, the output signal of the I4 block is 1, and the input O.

After the expiration of the set time for operating mode / time delay of block 14), the signal appears at the second input of the element OR NOT 16

equal O. The signal at the first input

0 of the element OR NOT 16 is equal to I, and at the second O, respectively, its output signal is O at the same time. At the input of block 17, there is no signal, which indicates the output of the coal to the operating mode. In case of failure to exit the mode, the signal from correction block 10 the value of the signal from setpoint 12 is lower, and comparator 11 is not activated. At its output, a signal equal to O appears, which arrives at the first input of the element OR NOT 16, and the second input (after the expiration of the time delay of block 14) receives a signal, also equal to O, which causes the appearance of a signal element OR-NOT 16, equal to 1, which is fed to the first input of the block. 7. The latter at the same time implements ---- sound alarm, including 5

Indicator and violation of the exit to the operating mode. The output signal of block 17 is fed to block 4 of the control, and the unit is turned off.

After entering the mode, the device protects the unit from abnormal modes (for example, subcoils-: Ka between the blades of the working wheel, non-intensive cavitation mode: etc.) as follows: I When the operating mode is violated, the output signal of the correction unit 10 is reduced and reaches the threshold value of the comparator 11, which is turned off, and the input of the delay block 13 is a signal equal to O, the block From is intended to delay the arrival of the signal from the comparator 1 (when it is turned off) to the first input of the OR element NOT 16 for the purpose of pr dotvrasche- i. No false signal from comparator 1I. This signal may occur as a result of a short-term disruption of the operating mode, which does not affect the normal mode of medium transportation. If the comparator 11 is not disconnected by a short-term HapyiueimeM operating mode, then its output signal, equal to O, after the BpCMemi expires, the delay arrives at the first input of the OR element NOT 16. The second input of the I-ITIH-HE 16 element from block 14 receives a signal, also the signal causes the appearance at the output of an OR-NOT element 16 signal equal to 1, which is fed to the input of block 17. The latter activates an audible alarm and a corresponding light indicator indicating a violation of the pumping mode. The output signal of block 17 goes to control block 4, causing the unit to shut off.

The device also implements. control of current electricity consumption. The signal from the low-frequency filter 9, corresponding to the active power consumed by the electric motor 5, is fed through a large-scale divider 23 to the input of the converter 20, the Large-scale divider 23 is designed to match the parameters of the low-frequency filter 9 to the voltage-frequency converter 20. As well as to adjust the relations f Pd, where f is the pulse frequency of the converter 20, Pd is active. power consumed by an electric motor

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Telem 5 (Rd U, filter output voltage 9).

Converter 20 converts the input signal (RD) to frequency

pulses (f Pq) of a RECTAL shape with a calibrated duration, which are fed to the input of the summing counter 21. The latter counts the incoming pulses, i.e. when the next pulse arrives, the counter content is increased by 1. From the output of counter 2, the binary-decimal code is fed to the input of the switch 24, which sets the conversion factor depending on the nominal current and coefficient:. transformation used sensor current 1. The conversion factor in the form of a binary-decimal code set by the switch 24 is fed to the decoder 22, which determines the required amount of the sum of pulses of the counter 21, corresponding to I kW, h.

When the codes coincide, j and xD, i.e. when the counter 21 dials the necessary amount of pulses, the output signal of the decoder 22 is fed to the second input of counter 2, the appearance of a pulse at its other input causes a reset to the initial state and counter 21 again starts counting the pulses that go to its first input. The presence of switch 24 provides versatility of the device, since it allows the device to be used for any type of current sensor. The output signal of the decoder 22 is also fed to the input of a summing counter 25, which counts pulses, each of which corresponds to a power consumption of 1 kWh. The number of pulses accumulated by the meter 25 corresponds to the total power consumption. The contents of the counter 25 through the decoder 3 is fed to the third input of the signal unit 17. and on the light indicator The power consumption is highlighted the current value of the power consumption.

Based on the obtained value of the current energy consumption, the device monitors the residual life of the unit as follows.

Before starting operation, unit 19 sets the required resource value for this unit (by the amount of consumed electric power) in the video defined

The number of pulses accumulated by the I 8 counting counter and the summing counter 26. The contents of the counter 26 through the decoder 29 are fed to the sixth input of the block 17 and the number indicating the given resource is displayed on the led indicator. one

The output SigNil of the decoder 22 is also fed to the first input of the counter 18, which at the same time subtracts the input pulse from the contents in this counter. The remaining number of pulses through the decoder 27 is fed to the fourth input of the block 17 and the number indicating the value of the residual resource of the unit is displayed on the Residual light indicator on the LED. When a specified resource is used up, the code {y1 corresponding to O, which enters the input of the decoder 28, appears at the output of the counter 18. In this case, a signal appears at its output that triggers the trigger 31, the output signal goes to the fifth the input of block 17, including the indicator Resource consumed,

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as well as in block 4 for blocking the switching on of the unit. I

Claims (1)

Thus, according to the indications of the indicated light indicators, the operator controls the residual life of the unit, the current power consumption, and when a given resource is used up, the device blocks the activation, thereby protecting the coal pump from further operation. Invention Formula The control and protection device of the timber unit according to autom, ev, no. 1281751, characterized in that, in order to expand the functional capabilities of the device by ensuring the monitoring of the service life of the pump, it is equipped with a comparison element and a resource unit and device connected to it control of electricity consumed, including a voltage-frequency converter connected in series, a pulse counter and a decoder, while the voltage-frequency converter input is connected to the output of the low-frequency filter, and The output of the reference element is with the input of the alarm unit.