Talking about the automatic switching of the main steam regulation system
In the transformation of the power plant furnace, the dual power supply interlock circuit can improve the operational safety of the main steam pressure regulation system. The regulator accepts the main steam pressure, the drum pressure and the speed regulation stage pressure signal. After internal calculation, the 4-20 mA signal is sent to the total operator. The total operator is responsible for the automatic and manual switching and synchronous direct operation tasks.
When the system is switched to the automatic state, the total operator sends a 1~5V signal to the layer operator, and then the layer operator sends a 1~5V signal to each single operator in the same layer, and then the 4-20mA is sent by the single operator. The signal is used to control the frequency converter, change the output frequency, control the speed of the motor, and achieve the purpose of controlling the amount of powder. When the system is in the manual state, the button of the single-operator can be directly operated, and the amount of powder can be controlled.
In the main steam pressure regulation system, the reliability of the three-phase power supply plays a vital role. Therefore, the adjustment system uses a dual power supply interlock circuit.
The working principle is that after the knife switch is closed, the main power switch is closed in turn, and the standby power switch is turned on, so that the main power source supplies power to the six inverters. When the main power failure occurs, the main power supply side coil loses power, the standby power supply side normally closed contact point is closed, and the standby power supply supplies power to the six inverters, thereby completing the automatic switching function.
The actual power supply interlock circuit is powered by two sets of main and standby power supplies, and each group supplies power to six inverters. The circuit has introduced the full stop and stop interlocking signals of the blower to ensure the safe and reliable operation of the boiler unit.
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