10kvDirectly facing a wide range of electricity consumers, the load switch is a key equipment in the distribution network, with its quality directly affecting10kvThe safety of the power grid and the quality of power supply, this article discusses10kvExploring the various features of load-disconnect switch cabinets, aiming to familiarize ourselves with their connection methods and management techniques for proper usage.10kvLoad-breaking switch cabinets ensure safe electrical use.
1、10kvMain Technical Specifications of Load Break Switch Cabinets
Rated voltage, rated current, and rated frequency, as well as the opening current for active load, are compatible with other electrical equipment currently manufactured and used in our country; the dielectric strength between phase and ground for the power load switch, as well as the dielectric strength between the arc gaps, meets national standards and meets the requirements for safe operation; whether the dynamic and thermal stability currents of the power load switch can meet the large current and stability requirements currently traversed by the power system; whether the equipment connecting the transformer unit of the power load switch, in conjunction with the fuse blowing time function, can be compatible with the setting of the relay protection for the outgoing lines of the power system; due to10kvLoad Break Switch Cabinets with Enclosed Breakssf6Units can be installed in the same gas box, with several unit interfaces running inside.10kvBusbars are also enclosed, thereby reducing the likelihood of faults. This meets the requirements for clear demarcation and extension of cable entries and exits in boundary cabinets, as well as ensuring safe power supply.
2System and power supply wiring methods for load switch customers
Image1、2、3、4Various as shown in the Chinese.10kvSupply wiring forms, they are primarily in10kvPower cable lines as the incoming power supply source, and adopting10kvHigh-voltage side metering (with low-voltage metering used for technically small capacity power customers) serves as the basis for calculating electricity fees. The required power load is generally...1000kva[No Chinese content provided, original text returned: 上]10kvDual power supply main power line for larger load power customers, as shown in the figure.1、2Shown; single power supply10kvQualified power clients, as shown3Shown; adopted10kvSingle-phase power supply, with relatively lower power load requirements, and also suitable for customers who can utilize the box-type transformer power supply, as shown.4As shown. Below, we will explain according to the illustration.
10kvThe main power supply method with two cable entry lines is typically segmented operation of the two power sources, utilizing segmented metering. In the event of an issue with either entry line power source, the affected side can be disconnected.10kvBreakers are thrown open, then the interlock switches are closed to continue power supply. Photo1、2It's quite typical.10kvA diagram showing the main power supply with dual power sources, the number and capacity of transformers, which can be adjusted as needed under compliance with technical specifications. Actual operation proves10kvA set of load switches with mechanical interlocks connected to two power input lines must be installed between two busbars to meet10kvFlexible power supply and the requirement for reliability and safety. Based on the customer's operational management level, as well as the need for operational safety and inspection maintenance, T2An electrical load switch has been added to each section of the busbar, primarily to ensure the safety of component maintenance and testing during the normal inspection and operation of the metering unit.
Two Clients10kvPower intake lines, which can be directly connected to the two lines of the substation,10kvOutlets for circuit breakers can be provided separately, or they can be sourced from the outlets of the two boundary substation rooms nearest to the power customer.10kvPower load switches have replaced the original circuit breakers, eliminating the need for testing and maintenance of relay protection and circuit breakers, etc. They are simple, reliable, and easy to master. The main difference between the two is not the number of transformers installed, but whether or not they are present.10kvOutage Unit. Considering the operation and management of electrical equipment after it is put into service, generally speaking, the diagram3The power load supplied by the outgoing unit is often an extension of the same related customer. For instance, in larger residential communities or complexes, due to the requirements of power supply distance and load, a radial power supply connection is adopted from the main substation of the power customer to the surrounding areas. Otherwise, due to coordination issues in operation management, dispatching, and operation, this type of connection is generally not suitable for mutual use among most power customers. Illustration:4It's a typical10kvMetering customer power supply forms, many box-type transformers adopt this type of main wiring. The main wiring described above is just a schematic diagram, its purpose is to illustrate its suitability for objects that use power load switches. As for specifics to10kvThe selection and installation of components such as surge arresters, current transformers, and voltage transformers should be based on the power supply scheme and design drawings of the electrical system.
3、10kvApplication of Load Break Switch Cabinets in Power Distribution Engineering
Adopted10kvLoad switches and rapid fuse links with interlock devices, when used in conjunction with connected isolation switches, meet electrical technical specifications, have a small size, and are easy to maintain and debug. They are ideal for equipment with single unit capacity (oil transformers).630kvaNo Chinese content provided. Please provide the text to be translated.800kvaTransformer power customers can opt for load switches.-Circuit breakers and combination switchgear are supplied in the form of transformer substations (or box-type substations) consisting of fully sealed oil transformers. When multiple transformers are used, each transformer is equipped with its own load switch.-Circuit Breaker Combination Electrical Switchgear. When fire prevention requirements are present in the operating environment, or when economic conditions permit and the operating environment is suitable, dry-type transformers should be used for power supply.
Adopted10kvLoad switches can also place several units togethersf6Within the gas cabinet, a switch box with a closed busbar, simple structure, and small volume has been developed, which effectively solves the cabletAddressing and extending issues, the power load switches in the substation boundary cubicles enable various power customers to isolate and extend, achieving10kvElectrical cabletWe are expanding and enhancing our power supply connections. Additionally, to ensure the reliability of power supply for certain electricity customers, a dual-circuit power supply (ring network) solution can be considered with minimal investment increase, significantly enhancing the safety and reliability of power supply.10kvThe wiring method for the sectioning cabinet power load switch varies depending on the specific situation (usually each sectioning cabinet is installed...3～4A significant increase in units sold.
From the image5Please refer to the wiring diagram.10kvBusbars are enclosed, actually featuring a modular structure that facilitates easy expansion and an increase in the number of connections, while also allowing for...10kvOperation and management system for electrical load switches ensures normal switching operations during operation and mutual isolation without interference, adequately meeting10kvSafe operation of the power distribution network.
Certainly, as the number of power cable supply customers continues to increase, the quantity of boundary rooms also grows rapidly, which enhances the workload for the operation and management of the power system as well as switching operations. Therefore, currently in operation...10kvLoad switch cabinets require research and improvement in operational methods to further meet and adapt to the requirements of automated operation management, facilitating future upgrades and transformations of distribution network automation, and better serving safe operation. There is still much work to be refined.
4No Chinese content provided.
In summary,10 kvThe load switch cabinet boasts numerous advantages, including safety and reliability, long electrical lifespan, frequent operability, compact structure, small size, light weight, and minimal maintenance requirements. When paired with current-limiting fuses, it effectively protects medium and small capacity transformers. It is a primary equipment choice for distribution engineering projects.
