I. Overview With the expansion of the company's production scale and the improvement of production automation, the requirements for the automation level of electrical systems in production processes are also increasing, prompting the large-scale deployment of microprocessor-based relay protection devices in our company's power system. The number of analog, switching, and primary equipment status data collected by various intelligent devices in the power system has greatly increased, allowing operators to obtain more real-time information from primary and secondary equipment. However, because current microprocessor-based secondary equipment is primarily designed to replace the functions of previous equipment, these devices operate largely independently, resulting in the loss and underutilization of a large amount of collected information. The company's power system is an inseparable whole; comprehensive utilization of information from all primary and secondary equipment within the system is of great significance for ensuring safe power supply. In recent years, the rapid development of computer and network technologies has made it possible to comprehensively utilize information from all primary and secondary equipment in the power system. Comprehensive utilization of the information collected by intelligent devices throughout the power system, through manual or automatic calculation and analysis, and adjustment of the relay protection's operating status, facilitates the analysis and handling of accidents, adjustment of operating modes, and technical management of equipment by staff. It can achieve the following main functions: 1. Real-time monitoring and scientific scheduling management of the operation of various 6KV main substations; 2. Rapid and accurate location and handling of various complex system accidents; 3. Rapid and accurate identification and analysis of fault causes using fault waveform recording and fault information recording of various devices; 4. Realization of interlocking and coordination of electrical equipment with the DCS control system through the comprehensive utilization of programming functions and inputs of various devices; 5. Remote adjustment and switching of relay protection devices; 6. Analysis and research on the reliability of relay protection devices operating in the system. II. System Composition The microprocessor-based relay protection devices, intelligent signal acquisition devices, and various automatic control devices at each substation are configured into a comprehensive automated dispatch and management system for that substation, based on their respective characteristics and using different communication methods: Substations 01#, 02#, and 05# use RS232 and RS485 serial communication to connect various individual intelligent devices such as Siemens microprocessor-based protection devices, NARI-Zhongde's NSP-7xx series distributed protection and monitoring units, NARI Electric Control's microprocessor-based generator excitation devices, and smart meters. The NSC2000 substation automation system software is used to form an independent comprehensive automated dispatch and management system for each substation. Substations 03# and 04# use industrial Ethernet and fieldbus communication to connect Beijing Dewitt's 600 series and 9000 series microprocessor-based relay protection devices and smart meters. The DVP3000 substation comprehensive automation software is used to form the automation management system for substations 03# and 04#. Each substation utilizes communication cables and optical fibers to establish a local area network (LAN) for power dispatching systems. This LAN is centrally configured in the main dispatching room for operators to monitor and manage the operation of all major substations in the company. The communication structure is shown in Figures 1 and 2. III. Analysis and Discussion of Practical Applications 1. Real-time monitoring of the operation of the 110kV substation and all major 6kV substations allows operators to understand the system's operating status accurately and promptly, enabling scientific dispatching and management of system operation, ensuring the company's entire power supply system remains safe, reliable, and economical. Simultaneously, technicians can utilize intelligent computer software and process energy optimization technology to analyze and calculate all collected information, adjusting operating modes promptly based on the actual situation of the power supply system. This reduces power losses in power lines and equipment, promotes safe, stable, and long-term operation of the power supply system, achieves energy conservation and emission reduction, lowers production costs, and enhances the market competitiveness of the company's products. 2. Rapid and accurate location and handling of various complex system accidents. Current fault location algorithms for protection and fault recorders are generally divided into two categories: fault analysis methods and traveling wave methods. The traveling wave method is difficult to apply effectively in production due to issues such as the extraction of traveling wave signals and the uncertainty of traveling waves generated by faults. Fault analysis methods, to accurately locate faults, require information such as the combined impedance at both ends of the line before the fault, the operating mode of adjacent lines, and the mutual inductance with adjacent lines. Clearly, relying solely on data collected by protection systems or fault recorders is insufficient for accurate fault location. Furthermore, for complex faults, single-end analysis methods are inadequate for accurately determining the fault nature and distance. We know that the more system fault information obtained, the more accurate the determination of the fault nature, location, and distance. Therefore, by leveraging the data from the EMS system and storing all primary equipment parameters in the dispatching database, the operating status of the primary equipment before the fault can be obtained. After a fault occurs, client terminals at both ends of the line can collect fault reports from protection systems and fault recorders and upload them to the server. The dispatching server integrates this information and, through relatively simple fault calculations, can determine the fault nature and achieve accurate fault location. 3. Utilizing fault waveforms and fault information records from various devices, the causes of faults can be quickly and accurately identified and analyzed. After a system accident, it is often accompanied by malfunctions of other protection or adjacent circuit protection. Traditional accident analysis involves personnel collecting data at each protection operation location, which is prone to bias due to the influence of individual experience, skill level, and the performance of older relay protection devices. Because a comprehensive automation system composed of microprocessor-based relay protection collects the operating status and data of primary equipment before and after the fault, as well as fault reports from substation protection and fault waveform recordings, it can perform fuzzy analysis by integrating protection operation information at both ends of the line and other protection operation information at the same end. Based on the sampled data from protection and fault recording, precise calculations can be performed, enabling rapid and accurate judgments. 4. By leveraging the programming functions and input parameters of the microprocessor relay protection device, the interlocking and coordination of electrical equipment with the instrument DCS control system can be achieved. This can be achieved by utilizing the thermal model within the ANSI66 functional module of Siemens' 4th generation microprocessor-based protection device 7UM62. Using the stator current of the high-voltage asynchronous motor as the initial value, the real-time rotor temperature can be indirectly calculated. When this temperature exceeds the motor's restart limit, the motor is no longer allowed to restart until the temperature drops below the limit. In our company's two combined heat and power generator sets (16MW + 30MW), the PLC programming module in the Siemens 7UM62 device analyzes the collected generator current and voltage to determine if the generator is overloaded. If overloaded, two pairs of nodes are sent out. One pair of nodes collects data from the main deceleration PLC system for load shedding as a criterion, while the other pair is sent to the main deceleration background information alarm system to remind operators to adjust the generator's operating status. In addition, we utilize the interrelation and coordination between the 12 input and 12 output relays of the DVP9000 series device from Beijing Dewit Company to link the instantaneous overcurrent and differential protection action signals to the motor closing circuit, preventing on-site operators from re-closing the fault and causing the accident to escalate. We connect the grounding switch position and circuit breaker position of the switchgear to the microprocessor relay protection device via input, linking the circuit breaker's opening and closing circuits, thus improving and supplementing the "five-proof" measures of the high-voltage switchgear. We introduce the on-site opening and closing, DCS opening and closing, control room opening and closing, and DCS process interlock signals into the microprocessor relay protection device to accurately record action information so that the specific action circuit can be quickly determined in the event of an accident, and the cause can be analyzed and the fault resolved. 5. Remote adjustment and switching of relay protection devices are possible to quickly adapt to changes in operating modes. Our company uses the NSP-7xx series protection devices from NARI-Zhongde and the 9000 series microcomputer relay protection devices from Beijing Dewitt, both of which can be configured with five different operating modes and can be remotely switched and adjusted. This facilitates timely adjustments to relay protection settings to adapt to the safe and stable operation of the system under different operating modes. 6. Reliability analysis of relay protection devices operating in the system is conducted. By exchanging information such as protection configuration, service time, and the positive and negative rates of various protection devices with the relay protection management information system, computer software can be used to analyze the reliability of relay protection devices. Especially when a certain protection or protection signal transmission device malfunctions and cannot be resolved temporarily, the reliability evaluation of such devices can be lowered to reduce the system's dependence on such protection. Remote setting adjustments can be used to coordinate with protection in upstream and downstream circuits, preventing the malfunction of such protection from expanding the scope of the accident. IV. Analysis of Existing Problems and Discussion of Solutions 1. Security Issues: Due to the powerful functions of the integrated automation system for power grid relay protection and its ability to control operating equipment, it is closely related to the safe and stable operation of the power grid. Therefore, sufficient attention must be paid to the system's security from the initial design stage. It can be said that the success of security measures is crucial to the successful operation of the microcomputer-based integrated automation system for relay protection. The initial plan is that the dispatch server must adopt a dual-machine hot standby mode to ensure hardware security; when remotely modifying protection settings, the client must verify the credibility of the settings transmitted by the dispatch terminal through encrypted digital signatures, and ensure the reliability of the settings through checksums and data feedback. Furthermore, when the client transmits settings to the protection system, it must not affect the normal performance of the protection. Much work still needs to be done in this regard. 2. Protocol Issues: All microcomputer protection systems, fault recorders, and field intelligent acquisition devices across the entire network need to be connected. If the information organization and transmission protocols can be properly resolved, it will greatly facilitate the implementation of the system. Therefore, it is hoped that a domestic relay protection information organization protocol can be established as soon as possible, referring to international standards. V. Conclusion Through the above analysis, we can see that with the widespread application of microprocessor-based relay protection in chemical enterprises and the realization of integrated substation automation systems, relay protection work in chemical enterprises will experience a qualitative leap. It will greatly enhance the efficiency and reliability of relay protection, which is of great significance for ensuring the safe and stable operation of the enterprise's power supply system. It is hoped that in the future, research, operation, and design personnel will strengthen research on the comprehensive utilization of microprocessor-based relay protection devices and related intelligent equipment information, further improving the scientific, rational, and rapid nature of the comprehensive utilization of microprocessor-based relay protection.