SU963485A1 - Control system for pumping station - Google Patents

Description

The control system for the pumping station operates in the following modes: standby, work, emergency, as well as when the Comaid "prohibit work" is turned on.

1. In the mode, the sprinkler machines are turned off, but pipeline 3 is at a pressure of 0.1-0.2 from the working pressure (to prevent air from entering the pipeline 3).

The pressure in the pipeline 3 is set to the value of the setting of the first pressure switch of the unit 5, it triggers and sends a signal to the regulator 6, as a result of which the unit 2 is turned on by one pump unit. After increasing the pressure to a predetermined value, the first pressure switch returns to its original position, which causes the pump unit to stop.

If the pressure continues to decrease when the pump unit is turned on, the second pressure switch triggers and the second pump unit switches on. Its disconnection occurs in the same way as the first pump unit is disconnected.

2. P a b about h and i re e and m. He is character; It is the work of at least one sprinkler.

When the machine is turned on, the electrohydraulic actuator of the corresponding gate valve is turned on, which starts to open. After the pressure at the inlet of the sprinkler is adjusted to the required value, the latter starts working.

At the moment of turning on the corresponding power supply unit of the gate valve, its input current increases from zero to a fixed (for a given unit) value, and the value of the input current is proportional to the flow rate of this sprinkler. Since the switch-on signal enters the measurement unit 28 almost instantaneously, information is transmitted to the controller 6 and the switching on of the first pump unit is carried out almost to the closed gate.

When subsequent blocks of the actuators of the gate valves are turned on, the total current increases, the current at the input of the regulator 6 increases accordingly. At a certain value of the input current determined by the total consumption of sprinkling machines and pump unit supply, unit 2 sends a signal to turn on the next pump unit, t. e. provide coordination of the pumping station supply with the total consumption of sprinkling machines.

In all cases, the signal to turn on the power supply goes to regulator 6 before opening the valve of the corresponding rain gear.

After the complete rotation of the sprinkler is completed, or when its electrical protection is triggered, the valve closes.

When the power supply is disconnected, the total input current decreases, which is recorded in the measurement block 28 and the controller 6.

With each change in the number of included units, a signal appears, which is fed to the upper control level block 26, and the last generates a control action to reduce water hammer in the irrigation network (for example, briefly throttling at the outlet of the pipeline 3, its connection to the process discharge and etc.)

3. Work system in Avar and Yi X X f and m ah. By emergency modes is meant:

the operation of the electrical protection is up to is de va l and o and m and w and i;

significant pipeline leaks (on the order of 30-35% or more of the sprinkler consumption);

disabling the sprinkler or the inability to turn it on due to the malfunction of the valve or its drive.

When the electrical protection is triggered, the unit turns off and turns off, and the total current in the two-wire line 32 decreases and the input current of the unit decreases, which can reduce the number of pumping units turned on, but without fixing the emergency sprinkler.

When a pipeline is ruptured due to a decrease in pressure in the discharge pipe, a signal is generated from the upper control level 26 due to a leakage circuit.

When the working sprinkler is disconnected or it is impossible to turn it on, the signals at the inputs of the comparison unit will be different, and there will be no signal at the output of block 5. With this combination, the signal is the signal at the output of the comparison block 27.

The output signals of the comparator unit 27 are fed to the input of the unit 26 in order to fix the accident in the system.

4. The operation of the system with real and 3 a c i and k o. M and d s "3 and n re t slave from s.

Claims (1)

When the system is in standby mode, the pumping units do not work and the output of the logic unit 30 has a signal that is fed to the input of the switching unit 25. When the "Disable operation on both outputs of block 26" command is issued, signals appear. The appearance of two signals at the input of block 25 will lead it to turn on and off line 32 of power supply 31. At the same time, neither power supply 33-38 can be turned on, the value of the current signal is zero at the input of controller 6, and, until cancellation The commands for working on pumping units cannot be activated. When the system is operating in the working mode, the implementation of the "Inhibit operation" command is implemented as follows. The appearance of the signal at the input of the prohibition block 29 leads to the appearance of a zero signal at its output and the input of the regulator 6. At the output of the latter, signals with a given shutter speed appear, ensuring the sequential shutdown of pumping units, the number of pumping units ensures sufficient flow - FOR the simultaneous closing of the valves without activating the hydraulic shock. Claims of the invention A control system for a pumping station comprising pumping units with electric motors, a pump control unit, a pipeline on which an inductive flow sensor and a pressure relay unit are connected electrically connected to the pump control unit and connected to to a pipeline, a system of consumers having electrohydraulic actuated valves, characterized in that, for the purpose of increasing efficiency and reliability, the system is equipped with a switching unit, a vertex unit control unit, a comparison unit, a measurement unit, a prohibition unit and a logic unit, the switching unit is electrically connected to the gate valve through a measurement unit, the pump unit control unit is connected to the switching unit through a logic unit, the upper level control unit is connected to the comparison unit and to the measurement unit, and the outputs - to the switching unit and to the prohibition unit, the latter being connected to the measurement unit by the second input, and the output - to the performance controller, and to the inputs of the comparison unit The measuring unit, the flow sensor and the pressure relay unit are switched off. The source of information taken into account in the examination: 1. D. Kozlov. Report “Automation of pumping stations operating on a closed network. M., "Soyuzvodiruekt, 1969, pnv. No. 7036-G, p. 45, fng. one.