Benefit Analysis of the Application of Electricity Management System

Electricity monitoring and management refers to: using modern electronic technology, communication technology, computer and network technology in combination with power equipment to organically integrate the monitoring, protection, control, metering of the distribution network under normal and accident conditions with the work management of the power supply department, improve the power supply quality, establish a closer and more responsible relationship with users, meet the diversity of user requirements at a reasonable price, and strive to achieve the best power supply economy and more effective enterprise management.

Factory power monitoring and management includes all functional data flows and controls related to the power distribution system in the enterprise. It mainly includes the following two aspects:

10KV and low voltage feeder automation. Feeder automation completes the monitoring, control, fault diagnosis, fault isolation and network reconstruction of feeder lines. Its main functions include: operation status monitoring, remote control and local autonomous control, fault area isolation, load transfer and power supply restoration, reactive power compensation and voltage regulation, etc.

· Distribution/substation automation. Substation automation refers to an automation system that uses automatic control technology and information processing and transmission technology to monitor, measure and operate substations through computer hardware and software systems or automatic devices instead of manual work. Substation automation, marked by signal digitization and computer communication technology, has entered the field of traditional substation secondary equipment, bringing about tremendous changes in substation operation and monitoring, and achieving significant benefits. The basic functions of substation automation include: data acquisition, data calculation and processing, over-limit and status monitoring, switch operation control and locking, information exchange with relay protection, coordination and cooperation of automatic control, information exchange with other automation devices in substations, and communication with dispatching control centers or centralized control centers. In recent years, a large number of distribution and substations have adopted substation automation equipment, showing significant economic benefits.

2. Analysis of direct economic benefits

1. Improve the quality of power supply

With the advent of the information age, more and more computer devices require uninterrupted power supply, which puts higher requirements on power supply. Power outages or power restrictions will lead to reduced production, while sudden power outages will endanger important equipment in the factory. The backward manual power distribution method is not applicable to modern manufacturing. Only by realizing power distribution automation can the quality of power supply be maximized to meet the needs of people's daily life, work and production. The automation of distribution stations can improve the reliability of power supply. The automation of distribution stations can reduce the number of failures, reduce the scope of accidents, shorten the time of accidents, and provide an effective basis for restoring power supply, quickly analyzing, diagnosing and reporting the cause of accidents. Before a factory adopted power distribution automation, the number of failures per month was 1, the repair time was 2 hours, the output value of goods per hour was 5,000 yuan, and it was in operation for 11 months a year. The production loss caused by power outages can be reduced by 2*1*5000*11=110,000 yuan each year. After adopting the power consumption monitoring and management system, the number of failures can be greatly reduced, and the hidden dangers of equipment can be discovered before failure occurs. There is no need for comprehensive power outages for maintenance. Production equipment can be kept running, which can reduce losses by 110,000 yuan each year.

2. Economic benefits of reducing network loss rate

According to the successful experience of the operation of domestic power consumption monitoring and management systems, the network loss rate can be reduced by more than 3% through voltage and reactive power optimization control. The annual power consumption of a factory is 10 million KWh. Through voltage and reactive power optimization control, 300,000 KWh of electricity can be saved each year. The energy saving benefit is calculated at 0.42 yuan/KWh, which saves 126,000 yuan each year. From this point of view, the direct economic benefits are very huge, and the indirect economic and social benefits are even greater.

3. Economic benefits of equipment management

The benefits of the power consumption monitoring and management system are also reflected in the management of power distribution equipment to a large extent. For example, if there is no corresponding power distribution automation monitoring and management system, all equipment will be regularly inspected and maintained at a certain period of time. The workload is huge and consumes a lot of manpower and material resources. The use of the power distribution management system can make equipment maintenance more targeted. It changes fault repair to status repair, changes manual inspection to automatic fault maintenance, reduces the labor intensity of maintenance personnel, reduces the number of operators, and enhances the maintenance-free nature of the power system.

By monitoring the load and distributing it reasonably, the investment in power supply equipment can be protected to the maximum extent. This is conducive to improving the safety and health level of the equipment and extending its service life. In a certain factory, the loss due to accidents such as burning of power equipment and power equipment is 60,000 yuan each year (the value of a transformer is more than 100,000 yuan, the value of a 10KV switch cabinet is between 50,000 and 80,000 yuan, and the value of motors ranges from several thousand to tens of thousands. High-voltage motors are more expensive, and other circuit breakers, contactors, and relays are more numerous and should be more easily burned). After realizing power distribution automation, such accidents can be completely avoided, saving 60,000 yuan in equipment maintenance costs each year.

4. Improve the management level of enterprise electricity consumption

Traditional electricity management is achieved by the experience of electricians (i.e., experience management). The quality of management is determined by the experience, sense of responsibility, and mood of electricians. In the manufacturing industry in the Pearl River Delta, electricians are called "big electricians". They are very important figures in the company. Even some management systems of the company have to be green-lighted by the "big electricians" because the boss knows that the mood of the "big electricians" can affect the company's electricity costs. However, the "big electricians" only play a role in ensuring electricity use in the factory, and there is no talk of safe, reliable (quality), and efficient electricity management.

The power monitoring and management system is a set of power management methods for modern factories in the information age. It can accurately and timely provide real-time data and information; it can intuitively monitor the operation of any place and any equipment in the whole factory, conveniently control the planned power outage and power supply, and realize overall control. It provides an effective basis for users to adjust the peak and valley periods of power consumption. The on-duty electrician can monitor the operation status of the system in real time through the computerized interface; the maintenance electrician can perform targeted maintenance and repair of the equipment according to the warning prompts on the screen; the electrical engineer can formulate maintenance, repair and rectification plans through system reports and analysis curves; the management representative can calculate and control the production cost according to the detailed power statistical report; and provide sufficient and complete data information for the enterprise ERP. On the basis of not increasing personnel costs, the management level has been greatly improved.

5. Save personnel costs

The electricity monitoring and management system makes the responsibilities of electricians clearer, the levels more distinct, and the division of labor more specific, and requires fewer but more refined operation and maintenance personnel. The experience of the power system: a factory 35KV substation saves 1/3 of the staff compared to before automation.

3. Indirect Economic Benefits

With the widespread application of power electronic products (such as inverters, computers, electronic ballasts, etc.), it also brings about power pollution, among which harmonics and electromagnetic interference have the most serious impact on the environment and equipment.

1. The power consumption monitoring and management system can be used to diagnose problems that have troubled the company for a long time and are difficult to solve, such as: bottlenecks in product qualification rates, short lifespans of computers and power control equipment, and other problems that are usually difficult to discover and solve.

2. Since the system's monitoring host is generally installed in an office or duty room, which is some distance away from electrical equipment (especially high-voltage equipment), it will reduce the number of front-line personnel such as duty officers, operators, and maintenance workers from the possible range of occupational diseases, reduce the incidence of employees in the power transmission and distribution system, reduce the medical burden of the enterprise, and improve the quality of life of employees.

IV. Conclusion

The economic benefits of the power consumption monitoring and management system have always been a matter of opinion. It undoubtedly has strong economic benefits. If the annual direct economic benefit output is defined as

S=（J+L+W）*T

J = Power outage loss caused by maintenance each year (assumed to be 110,000 yuan above)

L = the amount of electricity wasted due to grid losses each year (assuming it is 126,000 yuan above)

W = annual savings in equipment maintenance costs (assuming RMB 60,000 above)

T = Equipment operating life

Then, the economic benefit output will increase by 296,000 yuan each year. The longer the operation time, the more obvious the economic benefit.

In addition, it has more important social benefits. Reducing the working time of humans in strong electric fields is of great significance to the health of employees, and can avoid many occupational diseases and man-made electric shock accidents. Some employees who work in power plants, substations, and distribution stations for a long time have a high incidence of dizziness, palpitations, infertility, low blood pressure, diabetes, leukemia (blood cancer), lung cancer, brain tumors (cancer), etc. The cause of the disease is related to long-term radiation in strong electromagnetic fields. In modern factory power supply systems, the use of electricity monitoring and management systems can not only reduce these health problems as much as possible, but also generate huge economic benefits, which is undoubtedly the general trend.