Discussion on the electrical monitoring of Guangdong Electric Power Thermal Power Generator into the decentralized control system Deng Xudong Shajiao General Power Plant, 5761 High in Dongguan, Guangdong Province, realized the monitoring and management of the steam turbine boiler, but the automation level of the electrical part of the power plant is still relatively backward. To this end, the power plant electrical part into the 15 control of the question to discuss, analyze its feasibility and necessity, and explained the unit electrical part of the inclusion, 03 need to pay attention to and solve the number of 41.
With the development of large-capacity and high-parameter parameters, the automation water of the power plant is getting higher and higher, and the response of the computer in the power plant is becoming more and more extensive. For the two parts of thermal power automation and electrical automation in thermal power plant automation, thermal automation has adopted the distributed control system 1 in the reform of new units and old units to realize the monitoring of the furnace. The control level has a great control. Improvement, and the electrical monitoring still stays in the conventional illuminating plate, and the control logic composed of the relay control switch and its contacts is realized by hard wiring. The electrical relay protection excitation adjustment period and other devices have gradually realized the computerization, but the overall level of automation has not been improved, which has a lot to do with the traditional ideas of electrical control personnel including design and development. Many people still can't jump out of the old frame, they don't dare to take risks, and they don't want to discard old ones.
1 Feasibility and necessity of juice-to-machine technology, technology development to the present nine, especially on hardware and software or processing capacity reliability can meet the requirements of electrical monitoring, 0,220 and other unattended integrated automation substation in China This can be fully proved. Whether it is thermal automation or electrical automation, their monitoring objects are different, that is to say, the amount of the measurement is different, but these quantities can be converted into switching quantity analog quantity and the like by their respective logic control, except for relay protection. Excitation automatic adjustment ruler automatic quasi-synchronization 88 and factory power supply fast automatic switching 6 ding and other devices with complex principles and high speed requirements, other electrical monitoring functions can be fully incorporated into the existing 08 system to achieve centralized management of machine furnace power. The power control level of the main control room of the power plant is coordinated, which not only saves manpower and control the screen, but also increases construction or renovation costs.
2 Need to pay attention to and solve several questions related to electrical and thermal automation, there are special points, it is necessary to consider 3 electrical equipment relative to thermal equipment control object is less, not frequent operation, but reliability and operation accuracy Sexual requirements are high. Especially the generator transformer group and the factory power supply, once the error occurred, the consequences are very serious.
1 person 1 this. In the generator transformer group and the plant's 屯 source circuit breaker, the operation, especially the power supply switching of the generator grid-connected factory, must fully consider the safety and reliability of the operation. In order to avoid misoperation, it must be operated in 1 Add the necessary anti-missing condition logic and warning, according to the electrical operation, such as the accident handling automatic device lost 4., 08 system into the operator terminal failure, etc. can be some of the main switches such as the generator main switch hot magnetic Switching the backup power supply to turn off the security power supply, such as sweat or disconnection, it is necessary to set the button with hard wiring to achieve emergency breaking into strong delivery. However, it must be confirmed that this button cannot be used as a normal operation button, and 018 controls the circuit breaker. Interface relays are often used to achieve strong and weak power conversion for long-term charging such as interlocking or important circuits such as generator synchronous loop interface relays. The state must be monitored or its dual settings. Or use the hard wiring method of the original switch.
1Electrical equipment's relay protection automatic quasi-period 51 machine excitation voltage dynamic adjustment factory with backup power supply switching and other protection and safety automatic devices require high reliability and fast speed, and the principle and logic structure of the device is complex, according to the current The 08 system is difficult to achieve vertical requirements, so no, the system must use a special device, with each. 6, the interface power plant circuit breaker is used, or 220 voltage strong electric control, the interlocking lock relay in the control circuit is rated voltage ratio 0, the output relay rated voltage is higher, the contact capacity is also better than the nine circuit breaker control road The interlocking function does not accept the 08 system, so as to avoid, increase, and convert the relay, but reduce the reliability.
1Because the control switch is cancelled, the wiring method of the original system of the electrical system must be changed. It can be changed by the computer through logic to send out the way to start the accident horn when the switch accident trips.
6 The electrical quantity and optical signal that need to be monitored in the centralized control room can be used in the 08 data acquisition and processing system, eliminating the conventional measuring instrument and the light plate, which can greatly reduce the area of ​​the electrical control panel and avoid repeated settings. In order to be able to visually judge, a small number of measuring instruments and light plates can also be retained on the electrical control panel.
0 In order to facilitate the on-site test of the switch, and the 03 system debugging exits the inspection without affecting the operation of the electrical switch, it is advisable to set the control switch or the split button on the switch cabinet. In order to cooperate with the accident sound, a remote switch must be added to prevent the accident horn of the centralized control room when the local operation is prevented.
3 Conclusion In summary, the electrical equipment of the power plant is included in the unit. The 08 system is both necessary and feasible. As long as it is based on the particularity of the electrical control, it is considered to be perfect in design and operation, and at the same time to improve the control of the switch, etc. Electric protection, security door mover, etc. male. Guangdong Huadu. Electric 1 engineering handsome. Bachelor of Engineering, now engaged in professional management.
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