Substation Building Research Articles

Employing a Youth Internship Model to Identify Goals to Reduce Barriers to Active Living.

Active lifestyles are vital for promoting health. In this practice note, we describe the implementation of an active living intervention designed to engage youth in identifying barriers to being physically active and developing recommendations to address these barriers. Youth interns were compensated for their time. Through this project, the community obtained street striping for the first time, secured a community center when the police substation building was turned over to the community, and had sidewalk funding prioritized for one of their busiest streets. Lessons learned while developing and implementing this youth internship program focused on making the internship program work well given youth schedules and focusing on supporting the voice of youth to advocate for changes to the built environment in an intentionally excluded community.

Selection of 110 kV Prefabricated Steel Substations Considering Seismic Vulnerability in China

Prefabricated modular substations are expected to become the mainstream construction type for substations in China. However, there is a lack of scientific basis for structural selection and seismic performance evaluation. Taking a 110 kV substation as an example, this study compares the construction cost of cast-in situ reinforced concrete (RC) substations and prefabricated steel (PS) ones. Two types of PS structures are considered: one with H-section steel columns and the other with box-section steel columns. A seismic vulnerability analysis is performed to compare the probability distribution of various damage states of substation building structures under different seismic damage levels. Results indicate that the construction cost of PS structures is approximately 27.9% higher than that of cast-in situ concrete. When using H-section steel columns, there is a significant difference in the flexural stiffness in two horizontal directions, resulting in reduced seismic performance in the weak-axis direction. The construction cost of using box-section steel columns is slightly higher than that of the H-section steel case, but its seismic performance is significantly improved. Although the probability of slight and moderate damage states for the box-section steel column scheme is generally higher than that of the cast-in situ RC scheme, the probability of collapse is reduced. Thus, box-section steel columns are recommended for prefabricated modular substation building structures.

Distribution Pattern of ELF Field Exposure Electricity Distribution Substation Portal Pole Type 20 kV Medium Voltage Network

The electricity distribution substation is one of the components of the electricity distribution system. Electrical distribution substations, especially portal pole-type electrical distribution substations, can emit ELF fields. However, people need to be aware of the health risks of ELF fields and continue to carry out various activities near electricity distribution substations. This research aims to create a distribution pattern for ELF Field and determine its safety level based on WHO thresholds. The research was conducted in the Jember Regency, particularly in Sumbersari District. This research uses a portal pole-type electricity distribution substations. The substation criteria studied were a portal pole distribution substation on a 20 kV transmission line with a transformer capacity of 160 kVA. The measurement points are 0 m below the transformer, 0.7 m, 1.4 m, 2.1 m, 2.8 m, 3.5 m, 4.1 m, and 4.9 m from the distribution substation building at a height of 1.5 m from the ground for three days at 21.00 WIB and 30 measurements were taken. The distances of these points to the transformer are 4.256 m, 4.313 m, 4.480 m, 4.745 m, 5.094 m, 5.510 m, 5.979 m and 6.490 m respectively. The type of research used is quantitative research with survey data collection techniques. The research design used was cross sectional study. Cross sectional study is a type of observational research design that collects data at one specific point in time from a sample which represents the population studied. ELF field measurements show a spherical distribution pattern with an average magnetic field intensity between 0.0358 µT and 2.91 µT and an average electric field intensity between 2.35 V/m and 16.42 V/m. The magnitude of the magnetic field and electric field measured gets smaller as the distance from the measurement point increases. According to WHO, these results are below the threshold for the general group. This research concludes that the portal pole-type distribution substation in the medium voltage network produces a safe ELF field with a spherical distribution pattern that is inversely proportional to the distance.

Study on the performance characteristics of the substation PVASHP system based on TRNSYS

Taking the substation building as the research object, DeST software is used to simulate the annual building load of the case building, and the load results are connected to the TRNSYS software. At the same time, the G ENOPT software is used to optimize the solar inclination and azimuth, and the system simulation model of solar photovoltaic-air source heat pump is established and the data analysis is carried out. The results show that the peak cooling load of the substation building occurred on July 24th, The numerical value is the 49.28kW, The annual cumulative cooling load of the building is 20165.59 kWh; Based on Hooke Jeeves algorithm, the optimal inclination of photovoltaic panels is 44.18 and the optimal azimuth is 11.69; Typical days, The highest peak power of the air source heat pump appears at 1 a.m,Its peak power is 7.47 kW, The COP peak was 3.67; Within the typical week, Solar photovoltaic efficiency shows stable periodic changes, Peak aking around 12:00 noon, Its peak efficiency is 18.14%; There is a significant linear distribution relationship between the solar photovoltaic power generation capacity and the solar radiation, Its linear correlation coefficient was 0.85. Compared with the single air source heat pump system, the composite system saves 18.33% energy and has good application effect.

Optimization of substation enclosure performance and carbon emission analysis based on OED

To explore the thermal performance parameters of substation enclosure parameters and interaction and influence degree, using the DeST software simulation and orthogonal test method to building load minimum as the target parameters, select external wall heat transfer coefficient, roof heat transfer coefficient, outer window heat transfer coefficient and orthogonal test factors, carry out the four factors three level L9 (34) Orthogonal test analysis, studied the influence of each factor and its interaction on the building load, and finally obtained the optimal combination of factors under the comprehensive boundary conditions. At the same time, the correlation between load and outdoor temperature in the optimal scheme of unmanned substation and the carbon emission results before and after optimization are also explored. The results show that through univariate analysis, with the heat transfer coefficient of exterior wall, roof and window, the cumulative cooling load is not linear. Through the orthogonal experimental analysis, the significance of substation building is> roof exterior wall> south Angle> window, and the optimal is A1-B1-C2-D2The annual cumulative building cooling load is 20165.59 kW h, and the peak cooling load appears on July 24. The operating condition of 0 ~ 9kW accounts for 90.6% of the annual operating time. There is a strong linear correlation between the building cooling load and the outdoor temperature (R2=0.65), the energy saving rate of the final optimized scheme is 17.71%, and the carbon saving rate is 26.72%. The research content of this paper provides reference for the renovation of existing buildings and the design of new buildings in substation buildings.

Systematic testing, simulation, and mitigation of IEMI risks in medium-voltage substations

This paper introduces a comprehensive suite of testing, simulation, and mitigation strategies aimed at evaluating and countering intentional electromagnetic interference (IEMI) risks in medium-voltage (MV) substations. Diverging from conventional IEMI testing methods, the proposed testing approach assesses the entire substation control system, offering a more precise understanding of its IEMI vulnerabilities. Additionally, a novel simulation method coupling the transmitting antenna model and the full-wave substation model is presented for IEMI estimation, which simplifies the simulation process while maintaining good accuracy. Moreover, to further fortify substations against IEMI risks, a quantitative analysis is established to determine the necessary distance between the substation building and the fencing boundary. This analysis enables the integration of protective measures during the design and construction phase of the substation, substantially mitigating IEMI risks. Through a case study using a typical MV substation, the efficacy and capability of the proposed methods are demonstrated.

Low-carbon Design Principles and Operational Strategies for Concrete Substation Buildings

As the economy continues to advance, and the populace's demand for material well-being grows, urban areas are witnessing an increasing need for electricity supply. Substations, playing a pivotal role in the power industry, are proliferating in terms of both quantity and construction scale. Reinforced concrete substation buildings are a common infrastructure that provides a suitable physical environment for the operation of power equipment. A thorough examination and analysis conducted through on-site investigations have unveiled deficiencies in the low-carbon design and operation of substation buildings, resulting in energy wastage and extra carbon emissions. Consequently, this study endeavors to introduce a method for calculating carbon emissions during the operational phase of reinforced concrete structure substations. It also presents corresponding strategies for low-carbon design and operation. These strategies encompass low-carbon design principles for the building envelope structure, the utilization of renewable energy, low-carbon design considerations for artificial lighting, and the implementation of intelligent environmental control systems. The strategies proposed in this research provide valuable ideas for making the power and construction industries more environmentally friendly and energy-efficient.

Carbon Emission Assessment of a Substation Building in Xiamen, China

Buildings are, collectively, a high-energy-consuming sector, accounting for as much as 50.9% of total carbon emissions. With the introduction of carbon peaks and neutrality as carbon reduction strategies, carbon emissions reduction has become a research hotspot in the construction industry. Most of the current research focuses on residential and public buildings; the carbon footprint of industrial buildings has been less explored. In this study, we focused on a subset of industrial buildings, the energy substations in Xiamen, China. The carbon intensity of the three stages of material production, transportation, and operation is calcu-lated. The results of the study show that the three stages of whole-life cycle carbon emissions are 1,612,889.25, 51,038.9 and 17,034,352.5 kgCO2e, and the percent are 8.63%, 0.27% and 91.10%, respectively.

Research on Energy Efficiency Evaluation Model of Substation Building Based on AHP and Fuzzy Comprehensive Theory

The traditional energy-saving evaluation method for industrial buildings is intended for all industrial buildings; however, substation buildings belong to a special category of industrial buildings, and their energy consumption characteristics are different from those of general industrial buildings. Consequently, it is necessary to establish an energy-saving evaluation system for substation buildings according to the characteristics of their energy consumption. In view of the issue that the energy consumption characteristics of substation buildings are different from those of other industrial buildings, an analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE) are used to establish a more comprehensive energy saving evaluation model that is more applicable to substation buildings. This paper determines 19 quantitative indicators and 13 qualitative indicators through the screening of relevant standards and norms, as well as the literature, and then determines the weight of each indicator by using AHP before finally establishing a secondary evaluation model based on FCE. In this paper, a substation in Shandong, China was selected as a case study to verify the proposed evaluation model, scoring 80.4 points, which falls within the “Good” grade. This method is of great significance for the future establishment of energy-saving evaluation system for substation buildings.

Case Study for Underground Basement Wall Leakage and Measures

Underground basement structure is one of the key structures in substation building, which constructed 5.00-6.00m below ground level. Due to high ground water table, in most of the cases, basement structures located submerged in water. As the underground basement constructed mainly to accommodate the incoming / outgoing cables and other services, protecting the structure from water dampness and seepages is vital process. Even though all the precaution measure taken during constructions, some project may occur water seepage. Hence, in this article, we explore the case study of water dampness, causes, corrective and preventive measures obtained in one of the project.

Optimization Model of Substation Building Envelope–Renewable Energy Utilization Based on Life-Cycle Minimum Carbon Emissions

Maximizing the carbon reduction in substations with minimum cost investments can be achieved by taking advantage of the potential of substations in terms of the envelope and renewable energy, which is significant in promoting carbon reduction in substations. Therefore, firstly, the relationship between building cost–energy consumption–carbon emissions is explored, and then the global optimal calculation model of substation envelope–renewable energy is established, with the lowest life-cycle carbon emission of the substation as the optimization goal. Finally, the validity of the model is verified based on a case study of a typical 110 kV outdoor substation. The model calculation results show that, without considering the cost constraint, Harbin has the highest maximum carbon reduction of 180,350 kg, which is 25.15% and 13.74% higher than the maximum carbon reduction in Shanghai and Haikou, respectively. Furthermore, based on the comparison of the cost and benefits of each carbon reduction technology, a prioritization of various carbon reduction technologies is given for each climate zone. The model established in this paper can provide the optimal configuration of substation carbon reduction technologies with different incremental cost constraints, and provide a reference for the low-carbon design of substations.

Research on Passive Design Strategies for Low-Carbon Substations in Different Climate Zones

In the energy-saving design of substations, the building envelope thermal parameters, window-to-wall ratio, and shape factor are three crucial influencing factors. They not only affect the building’s appearance but also have an important impact on the total building energy consumption. In this paper, we applied the energy consumption simulation software DeST-c to study the influence of the above three elements on the total energy consumption of the building in a representative city with different thermal zones. The optimal envelope thermal parameters, optimal window-to-wall ratio, and optimal shape factor were derived through combination with economic analysis. Finally, the sensitivity analysis of different elements was carried out to determine the suitable passive design solutions for substations in different climate zones. It was found that the thickness of roof insulation has the greatest influence on the energy consumption of substation buildings among all envelopes. The optimal window-to-wall ratios were 0.4, 0.4~0.5, 0.3, 0.3~0.4, and 0.5 for severe cold, cold, hot summer and cold winter, hot summer and warm winter, and mild regions, respectively; and the optimal shape factors were 0.29, 0.30, 0.23, 0.31, and 0.33, respectively. The conclusions of this study can provide architects with energy-saving design strategies and suggestions for substations in different climate zones, and provide references for building energy-saving designs and air conditioning and heating equipment selection.

STUDY OF GROUND FAULT PROTECTION SYSTEM IN THE MEDIUM VOLTAGE PANEL OF THE MAIN POWERHOUSE AT THE AIRPORT

The protection system is a system for securing electrical equipment caused by abnormal conditions such as short circuits (phase contact with the ground), human error, and others and detecting disturbances that occur and overcoming these disturbances in a short time. The ground fault protection system has not been activated at Juanda Airport Surabaya. This research aims to avoid problems that cause ground faults that spread throughout the MV. The Medium Voltage (MV) panel ground fault protection system used by MPH, namely MPH M-03, for voltage distribution to Air Field Lighting (AFL) substation and Airport Operation Building (AOB) substation, and Pump House 4 (PH 4) has not been activated. This study assesses the impact of activating the ground fault protection system for the MV MPH M-03 panel using the SEPAM protection relay. The research method is an exploratory study of the ground fault protection system in the M-03 main powerhouse medium voltage panel. The results showed that using a ground fault protection system for the MV MPH M-03 panel using the SEPAM protection relay is safer due to the ground fault indicator on the equipment. The Ground Fault panel helps protect electrical equipment and supplies from damage caused by ground faults. Quickly shutting off power in the event of a fault prevents excessive current flow that can damage or destroy sensitive equipment. This benefit is significant in industrial environments or areas with valuable equipment where downtime and repairs can be costly. The conclusion is that these systems should be used for safety in voltage transmission and distribution operations. Activating the ground fault protection system, operational safety at Juanda Airport Surabaya will be guaranteed, and it will be safer for the MV panel equipment and safety for the technicians working.

Study on Vibration Isolation Design Analysis of 500 kV Indoor Substation

In order to study the applicability of isolation technology for indoor substations, this paper establishes a numerical prototype and isolation structure simulation model of a 500 kV indoor substation building structure by using finite element software. Modal analysis and seismic response analysis are carried out to study the dynamic characteristics and seismic response rules of the building for the prototype and isolation structure. The numerical simulation results show that the higher the floor, the more significant the amplification of the acceleration response, and the acceleration response amplification coefficients of the second and third floors are greater than the 2.0 required by the code. The transverse shear force of the first column is reduced by 78%, the acceleration response of the second and above floors is reduced by 80%, and the seismic fortification intensity of the second and above electrical equipment can be reduced by one degree. The maximum displacement of the isolation bearing is 310.32 mm, which is smaller than the limiting displacement of the minimum type of isolation bearing, which is 330 mm. The performance of the isolation bearing is in the safe and stable region, and the isolation design scheme is more reasonable. Compared with the prototype structure, the isolation design scheme significantly reduces the inter-story displacement of each floor, and the concrete frame of the isolation structure is in the elastic region under the earthquake action, which improves the seismic performance of the building and electrical equipment.

Uncertainty quantification and sensitivity analysis of energy consumption in substation buildings at the planning stage

ABSTRACT This study is the first to conduct a global sensitivity analysis to identify the crucial variables that have an impact on the energy consumption of substations. The peak cooling and heating energy consumption, as well as the annual cooling and heating energy consumption of a substation in Shandong, are all simulated basing the Monte Carlo method. The simulation outputs are discussed by uncertainty analysis to obtain more accurate energy consumption thresholds. Subsequently, the treed Gaussian process and the standardized rank regression coefficient are used to perform a global sensitivity analysis of the simulation outputs. The results of the two global sensitivity analyses are practically the same, demonstrating that robustness can be ensured by simultaneously using two methods based on different theories. In addition, this study provides an efficient method for the energy-saving retrofitting of the existing substation and the energy-saving design of green substations in the future.

Soil Resistivity, its Impact on Optimum Depth of Electrodes in Earthing System– Case Study University of Port Harcourt Residential Staff Quarters

A well-designed earthing system plays a vital role in any Electrical Facility. Soil resistivity measurement is an important parameter when designing earthing system. However, it is a known fact that the resistance of an earth electrode which is a component of earthing system is heavily influenced by the resistivity of the soil in which it is driven to. A knowledge of the soil resistivity at the intended site, and how this varies with parameters such as moisture content, temperature and depth, provides a valuable insight into how the desired earth resistance value can be achieved and maintained over the life of the installation with the minimum cost and effort. One of the main objectives of earthing electrical systems is to establish a common reference potential for the power supply system, building structure, plant steelwork, electrical conduits, cable ladders and trays and the instrumentation system. To achieve this objective, a suitable low resistance connection to earth is desirable. In this research paper, soil resistivity was investigated in three different residential staff quarters of University of Port Harcourt Choba, Abuja and Delta Campuses during the wet and dry season of 2022 using the relevant IEEE standards and International best practices for determining Electrical substation and residential buildings earthing system designs. To determine the optimum depth of grounding electrodes that will have the acceptable values of earth resistance and resistivity for earthing system designs, the Wenner four pin method of measuring soil resistivity was employed. The findings of this research paper show the optimum depth the grounding electrodes will get to in order to obtain the best earth resistance and resistivity values that is suitable for substation and residential earthing system designs. The outcome of this study is also useful for purposes of estimating the number of grounding electrodes, ground resistance and potential gradients including step and touch voltages of substation grounding installations around the three locations of study in university of Port Harcourt residential staff quarters.

Monitoring and Prediction Analysis of Settlement for the Substation on Soft Clay Foundation

The bearing capacity of soft clay foundations is low, which easily causes excessive cumulative and uneven settlement of the substation. This will seriously threaten the safe operation of equipment in the substation. Based on a 220‐kV substation project in a coastal soft clay ground, the settlement of the substation building is monitored on the spot, and the settlement law of soft clay ground is analyzed. Furthermore, a three‐dimensional finite element model is developed using finite element software named ZSOIL.PC. A numerical model for predicting the settlement of soft clay ground in a substation is proposed using the appropriate element type, material constitutive model, and calculation parameters. The rationality of the numerical method is validated by comparison with the measured data. After improving the soft clay ground with the cement‐soil deep mixing method, there are still certain degrees of cumulative and differential settlements in the substation distribution device building, but both are within the specification requirements. The settlement of the soft soil ground in the substation increases with time, but the growth rate gradually decreases and ultimately tends to stabilize after a certain period of time, ensuring the uniformity of foundation treatment is the key to controlling the differential settlement. The research results can provide a reference for the subsequent installation and construction of electrical equipment and the design of substation engineering in soft soil ground.

The optimization design of Piled raft foundation for substation building in US code

In order to get a more safety and economic foundation, finite element method was performed for a piled mat cap and piled strip cap by the software of STAAD. Through the finite element analysis, plate distribution region of bending moment and shear stress were researched; meanwhile, considering the compatibility of deformation of element plate, how to chose the design value of plate stress was researched. The result showed that: single plate value is not representative, average of value of 9 plates (3x3 array) is close to the fact. Strip cap is better than mat cap both from the moment value and shear value of plate element in this project; strip cap was recommended due to its remarkable economic benefit.

Research on Key Technologies of Substation Comprehensive Energy Saving in the Background of Smart Grid

In the current process of social and economic development in my country, electric energy as a basic power has become an important foundation for building economic growth. At present, in my country’s various substation systems, the application of intelligent substations has become the mainstream form of substation construction engineering with the progress of technology. As an important part of the intelligent substation building, the energy-saving system of intelligent substation building can achieve the purpose of high efficiency and energy saving while ensuring the normal operation of the substation. This article will start with a variety of smart substation building structures, and comprehensively analyse the functions, functions, and effects of smart substation energy-saving systems.

Power Substation Construction and Ventilation System Co-Designed Using Particle Swarm Optimization

This study discusses a numerical study that was developed to optimize the ventilation system in a power substation prior to its installation. We established a multiobjective particle swarm optimizer to identify the best approach for simultaneously improving, first, the ventilation performance considering the most appropriate inlet size and outlet openings and second, the reduction of the synthetic noise of the ventilation and power consumption from the exhaust fan equipment and its operation. The study used building information modeling to construct indoor and outdoor models of the substation building and verified the overall performance using ANSYS FLUENT 18.0 software to simulate the air velocity and air temperature distribution within the building. Results show that the exhaust fan of the B1F cable finishing room and the 23 kV gas insulated switchgear (GIS) room optimize the reduction of horsepower by approximately 1 Hp and 0.5 Hp. The combined noise is reduced by 4 dBA and 2 dBA; the exhaust fan runs for 30 min, and the two equipment rooms can cool down by 2.9 °C and 1.7 °C, respectively. Therefore, it is confirmed that the MOPSO algorithm provides a more energy-efficient and environmentally friendly building ventilation environment.