Exchange of effects after the transformation of the electrical control system of Unit #1 in Zhujiang Power Plant

Abstract: The exchange information on the effect of the transformation of the electrical control system of the #1 unit of the Pearl River Power Plant is provided by the excellent manufacturers of flowmeters and flowmeters. Foreword: Zhujiang Power Plant was built in the early 1990s, with an installed capacity of 4300MW coal-fired steam turbine units. The first unit was put into commercial operation in March 1993. The design and selection of electrical equipment and the configuration of auxiliary equipment are all at the level of the early 1970s, and the electrical control panel of one unit is only available. For more flowmeter manufacturers to select models and prices, you are welcome to inquire. The following is the details of the exchange article on the effect of the transformation of the electrical control system of the #1 unit of the Pearl River Power Plant. Foreword: Zhujiang Power Plant was built in the early 1990s, with an installed capacity of 4×300MW coal-fired steam turbine unit, the first unit was put into commercial operation in March 1993. The design and selection of electrical equipment and the configuration of auxiliary equipment are all at the level of the early 1970s. The electrical control panel of a unit has as many as five sides, all of which use traditional LW2 series control switches, XD10/220V type light characters The brand and MK-9 position indicators, electrical quantity measuring equipment are also electromagnetic and magnetoelectric indicating meters, and the relay protection devices are all electromagnetic rectifier relays produced by Xuji Factory. These devices are installed scattered and external wiring is quite complicated. , The workload of operation, maintenance and repair is large. Now, the development of science and technology is changing with each passing day, and power production is constantly adjusted according to the needs of the market. Facing this severe situation, the electrical control equipment of our factory is far from keeping up with the rhythm of market changes, nor can it adapt to the needs of changes in modern operating modes. . Therefore, technological transformation is the only way to improve the automatic operation level of equipment. After half a year (June-December 2001) research, the technical parameters and indicators of the control system equipment of various manufacturers were collected and compared, and the XDPS-400 distributed control system developed and produced by Shanghai Xinhua Control Engineering was used in a comprehensive and balanced manner to realize the Zhujiang Power Plant. #1 unit (machine, furnace, electrical equipment) integrated control. 1. Electrical equipment control system (ECS system) 1. ECS system hardware composition: 1.1 DPU and each I/O card cabinet (#33, #35 cabinet) 1.2 All electrical equipment I/O terminal cabinets (#34, #36 Cabinet) 1.3 Output expansion relay cabinet (#42 cabinet) 2. ECS system controlled range: 2.1 Generator-transformer unit unit electrical primary equipment control, interlock, electrical measurement logic circuit and protection related export signals. 2.2 Control, interlocking, electrical measurement logic circuits and signals of generator excitation system equipment. 2. 36KV system power distribution equipment and 380V system busbar tie switch control, interlock, electrical measurement circuit and related export signals for equipment protection. 2.405T start/standby transformer (220KV/6KV) and the control, interlocking, electrical measurement logic circuit and protection of the relevant export signals of the standby branch power distribution equipment of the public 6KV system. 3. Functions of ECS system: 3.1 It has control, interlocking and measurement of various electrical parameters for all the equipment involved in the transformation, and can display the equipment status and working conditions of each system on the screen. 3.2 Alarm after generator-transformation group and each power distribution equipment accident, advance notice, and protection action, light plate display, historical station record, and recall printing. 3.3 Automatic function; 3.3.1 Generator sequence control automatic boost and automatic quasi-synchronized grid connection. 3.3.2 Automatic switching operation between main generator and standby excitation. 3.3.3 The power consumption of the plant is automatically switched according to the load (the standby machine is switched to the local machine, the local machine is switched to the standby machine) 2. The technical transformation of the construction equipment is different from the installation of the new equipment. In addition, the construction and operation of the equipment is safe, and the construction quality and progress of the renovation equipment must be strictly controlled, especially in Guangdong, where the electricity load is jumping and changing, the overhaul period of a 300MW unit is generally 60 days, and the machine must be completed synchronously. , furnace, electric DCS transformation, this task is more than one-third larger than the control equipment workload of a newly installed (300MW) unit. The staff and leaders of the maintenance department of our factory have made the refinement of the transformation workload for many times, rationally combined the use of human resources, and used scientific management methods to achieve good results in the transformation. 2.1 Transformation tasks and construction period distribution (Note: Due to the quality problems of the cables used in the transformation, nearly 20 days of rework time were wasted, and this time was not counted into the construction time.) The specifications of equipment installation and wiring are the basis for the quality of debugging , Strict the process and technical requirements in installation and wiring, which can bring convenience to debugging, reduce detours, shorten debugging time, and improve debugging efficiency. 2.2 Static debugging was delayed for nearly 20 days due to quality problems in the cables, but the quality of the debugging work was not compromised. In the whole debugging process, we have been serious, careful and comprehensive. The wiring and contact points of each logic circuit must be intact; the input and output signal display of the corresponding equipment must be correct; the alarm, sound, accident, warning light plate, historical memory, and printing must be normal and correct. Commissioning of a device. Due to our clear debugging method, working time limit and quality requirements, appropriate target setting and reasonable personnel arrangement, under the guidance and cooperation of Shanghai Xinhua control technical experts, the static debugging of the ECS system has been carried out comprehensively, and the parameters of the system equipment have been obtained. In-depth demonstration, but also verified the integrity of equipment installation, wiring, process quality.

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