A method for monitoring a ring main unit

Abstract

The application discloses a kind of monitoring methods of ring main unit, comprising the following steps: step S1, the original temperature of ring main unit is monitored and collected, while the suitable operating temperature of ring main unit is given;Step S2, the operating power of heat dissipation system is regulated for the first time to reach maximum, step;S3, obtain the first average temperature difference value, with the last unchanged operating temperature as the first stable operating temperature;Step S4, repeat step S2-S3;Step S5, establish the fitting curve diagram of operating power difference value and average temperature difference value, obtain operating power-average temperature difference value function and operating power-stable operating temperature function;Step S6, when ring main unit is at a certain operating temperature, calculate the difference between it and stable operating temperature as average temperature difference value, directly substituted into operating power-average temperature difference value function, obtain expected operating power, regulate heat dissipation system through expected operating power, then repeat the step cyclically.The beneficial effects of the application are to reduce the number of power adjustment of the heat dissipation system in the ring main unit, and to improve the temperature control efficiency of the ring main unit.

Description

Technical Field

[0001] This invention belongs to the field of ring main unit technology, specifically, it relates to a ring main unit monitoring method. Background Technology

[0002] A ring main unit (RMU) is an electrical device consisting of a group of power transmission and distribution equipment housed in a metal or non-metal insulated cabinet or assembled into a modular ring network power supply unit. Its core components utilize load switches and fuses. It offers advantages such as simple structure, small size, low cost, improved power supply parameters and performance, and enhanced power supply safety. It is widely used in substations and prefabricated substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories.

[0003] During the operation of a ring main unit, its internal operating temperature will constantly change. When the operating temperature of the ring main unit exceeds the suitable operating temperature, the internal heat dissipation system will be activated to regulate the temperature of the ring main unit until the operating temperature of the ring main unit is lower than the suitable operating temperature. During this process, if the heat dissipation system always maintains maximum operating power, it will greatly increase the overall power consumption of the ring main unit. Therefore, a balance must be achieved between the operating temperature of the ring main unit and the operating power of the heat dissipation system.

[0004] To address the aforementioned issues, existing ring main unit (RMU) monitoring methods involve first monitoring the internal operating temperature of the RMU. When the operating temperature exceeds the optimal operating temperature, the operating power of the cooling system is increased to regulate the internal temperature. The operating temperature is then continuously recorded, and the cooling system's power is adjusted accordingly until the RMU's operating temperature stabilizes and falls below its optimal operating temperature. However, in practical use, this monitoring method has the following drawbacks: each temperature change requires numerous repetitive temperature adjustments, which is not rapid enough and can easily lead to safety accidents. Summary of the Invention

[0005] Existing monitoring methods for ring main units require repeated temperature adjustments each time the operating temperature changes. Furthermore, alarms are only triggered when the cooling system reaches maximum power and the ring main unit's operating temperature exceeds the optimal operating temperature, which is unreliable and unsafe. To address these issues, the following invention is proposed:

[0006] A monitoring method for a ring main unit includes the following steps:

[0007] Step S1: Turn off the cooling system, start the ring main unit, monitor and collect the operating temperature of the ring main unit at regular intervals, take the operating temperature of the ring main unit that no longer changes as the original temperature, and at the same time give the appropriate operating temperature of the ring main unit.

[0008] Step S2: First, adjust the operating power of the heat dissipation system to the maximum, and monitor and collect the operating temperature of the ring main unit at regular intervals until the operating temperature no longer changes. This monitoring period is called the first monitoring period, and the operating power of the heat dissipation system at this time is called the first operating power.

[0009] Step S3: Record the difference between the current operating temperature and the suitable operating temperature of the ring main unit at each monitoring time point during the first monitoring period, and calculate the average value as the first average temperature difference value. The last constant operating temperature is taken as the first stable operating temperature.

[0010] Step S4: Gradually reduce the operating power of the heat dissipation system, and take the difference between the current operating power and the maximum operating power as the operating power difference. Repeat steps S2-S3 to obtain multiple operating power differences, multiple average temperature differences, and multiple stable operating temperatures over multiple monitoring time periods.

[0011] Step S5: Establish a fitting curve of the difference in operating power and the average temperature difference. Use the fitting function of the fitting curve as the thermal efficiency conversion formula, and obtain the operating power-average temperature difference function and the operating power-stable operating temperature function.

[0012] Step S6: When the ring main unit is at a certain operating temperature, calculate the difference between it and the stable operating temperature. Substitute this difference as the average temperature difference value into the operating power - average temperature difference function to obtain the expected operating power. Adjust the heat dissipation system to the expected operating power. Every certain period of time, record the difference between the actual operating temperature and the stable operating temperature at the beginning of the ring main unit's change. Calculate the average value to obtain the actual average temperature difference value. Substitute the actual average temperature difference value into the operating power - average temperature difference function to obtain the expected operating power. Adjust the heat dissipation system to the expected operating power again to obtain the actual average temperature difference value again, and continue to substitute it into the operating power - average temperature difference function.

[0013] Furthermore, the fitting function in step S5 is either a linear function or a nonlinear function.

[0014] This invention proposes a monitoring method for ring main units. Its advantage lies in that, by using the operating power-average temperature difference function obtained above, the temperature control process can be achieved by only changing the operating power of the heat dissipation system a few times after each change in the operating temperature of the ring main unit. The overall process is relatively fast and less likely to cause safety accidents. Attached Figure Description

[0015] Figure 1 This is a flowchart of the ring main unit monitoring method in this invention. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments.

[0017] like Figure 1 As shown, this is a preferred embodiment of the present invention, a monitoring method for a ring main unit, comprising the following steps:

[0018] Step S1: Determine the initial temperature of the ring main unit and the suitable operating temperature of the given ring main unit.

[0019] Turn off the cooling system, start the ring main unit, monitor and collect the operating temperature of the ring main unit at regular intervals, and take the operating temperature of the ring main unit that no longer changes as the original temperature. The original temperature reflects the internal temperature of the ring main unit when the cooling system is not started. At the same time, the suitable operating temperature of the ring main unit is given. If the suitable operating temperature is higher than the original temperature, there is no need to start the cooling system.

[0020] Step S2: Calculate the first monitoring time period and the first operating power.

[0021] The cooling system is first adjusted to its maximum operating power, and the operating temperature of the ring main unit is monitored and collected at regular intervals until the operating temperature no longer changes. This monitoring period is called the first monitoring period, and the operating power of the cooling system at this time is called the first operating power. The first operating power represents the operating power of the cooling system when it reaches its heat dissipation limit.

[0022] Step S3: Calculate the average temperature difference and the first stable operating temperature during the first monitoring period.

[0023] Record the difference between the current operating temperature and the suitable operating temperature of the ring main unit at each monitoring time point within the first monitoring period, and calculate the average value as the first average temperature difference value. The last constant operating temperature is taken as the first stable operating temperature.

[0024] Step S4: Change the power of the heat dissipation system to obtain multiple operating power differences, multiple average temperature differences, and multiple stable operating temperatures.

[0025] Gradually reduce the operating power of the heat dissipation system, and use the difference between the current operating power and the maximum operating power as the operating power difference value. Repeat steps S2-S3, and finally obtain multiple operating power differences, multiple average temperature differences, and multiple stable operating temperatures over multiple monitoring time periods.

[0026] Step S5: Establish a fitting curve between the operating power difference and the average temperature difference, and provide the operating power-stable operating temperature function.

[0027] A fitting curve is established for the difference in operating power and the average temperature difference. The fitting function of the fitting curve is used as the thermal efficiency conversion formula. According to the condition of the fitting curve, the fitting function is also divided into linear fitting and nonlinear fitting. At the same time, the operating power-average temperature difference function and the operating power-stable operating temperature function are obtained. The operating power-average temperature difference function and the operating power-stable operating temperature function can be used to reflect the relationship between the operating power and average temperature difference of the heat dissipation system and the operating power and stable operating temperature of the heat dissipation system, respectively.

[0028] Step S6: Substitute the measured average temperature difference value into the operating power - average temperature difference value function to obtain the expected operating power, and repeat the cycle.

[0029] When the ring main unit is at a certain operating temperature, the difference between the current operating temperature and the stable operating temperature is calculated. This difference is used as the average temperature difference and directly substituted into the operating power - average temperature difference function to obtain the expected operating power. The cooling system is then adjusted to the expected operating power. Every so often, the difference between the actual operating temperature and the stable operating temperature at the start of the change is recorded, and the average value is calculated to obtain the actual average temperature difference. This actual average temperature difference is substituted into the operating power - average temperature difference function to obtain the expected operating power. The cooling system is then adjusted again to the expected operating power, and the actual average temperature difference is obtained again. This process is repeated until the average temperature difference is reduced to a lower range after only a few iterations. At this point, the operating power is optimized. If the operating power is substituted into the operating power - stable operating temperature function, a predicted value for the stable operating temperature of the ring main unit can be obtained.

[0030] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A monitoring method for a ring main unit, characterized in that: Includes the following steps, Step S1: Turn off the cooling system, start the ring main unit, monitor and collect the operating temperature of the ring main unit at regular intervals, take the operating temperature of the ring main unit that no longer changes as the original temperature, and at the same time give the appropriate operating temperature of the ring main unit. Step S2: First, adjust the operating power of the heat dissipation system to the maximum, and monitor and collect the operating temperature of the ring main unit at regular intervals until the operating temperature no longer changes. This monitoring period is called the first monitoring period, and the operating power of the heat dissipation system at this time is called the first operating power. Step S3: Record the difference between the current operating temperature and the suitable operating temperature of the ring main unit at each monitoring time point during the first monitoring period, and calculate the average value as the first average temperature difference value. The last constant operating temperature is taken as the first stable operating temperature. Step S4: Gradually reduce the operating power of the heat dissipation system, and take the difference between the current operating power and the maximum operating power as the operating power difference. Repeat steps S2-S3 to obtain multiple operating power differences, multiple average temperature differences, and multiple stable operating temperatures over multiple monitoring time periods. Step S5: Establish a fitting curve of the difference in operating power and the average temperature difference. Use the fitting function of the fitting curve as the thermal efficiency conversion formula, and obtain the operating power-average temperature difference function and the operating power-stable operating temperature function. Step S6: When the ring main unit is at a certain operating temperature, calculate the difference between it and the stable operating temperature. Substitute this difference as the average temperature difference value into the operating power - average temperature difference function to obtain the expected operating power. Adjust the heat dissipation system to the expected operating power. Every certain period of time, record the difference between the actual operating temperature and the stable operating temperature at the beginning of the ring main unit's change. Calculate the average value to obtain the actual average temperature difference value. Substitute the actual average temperature difference value into the operating power - average temperature difference function to obtain the expected operating power. Adjust the heat dissipation system to the expected operating power again to obtain the actual average temperature difference value again, and continue to substitute it into the operating power - average temperature difference function.

2. The monitoring method according to claim 1, characterized in that: The fitting function in step S5 is either a linear function or a nonlinear function.

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