State Grid Low Voltage Standardized Sample Cabinet
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State Grid Low-Voltage Standardized Cabinet
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The State Grid's standardized low-voltage switchgear features "safety and reliability, robustness and durability, unified standards, universal interchangeability, reasonable classification, and wide applicability." It extensively incorporates the operational experience and design achievements of various operating units and manufacturing enterprises. Based on thorough research and discussion, it unifies standards, simplifies classification, pilots advanced technologies, and accommodates differences, aiming to simplify operation and maintenance and improve efficiency.
Regarding the design of standardized low-voltage switchgear, the structural scheme, primary interfaces, secondary interfaces, civil engineering interfaces, and parameters of major components have been standardized and unified. This design streamlines the cabinet type, eliminating fixed cabinets and simplifying bus current specifications to three levels: 1250 A, 2000 A, and 2500 A. Feeder schemes are categorized into four types based on function. The system scheme and configuration requirements for primary and civil engineering interfaces have been streamlined, achieving unified functional configurations and cabinet paralleling to meet interchangeability requirements. Secondary principles, secondary interfaces, and secondary labeling have been standardized, making on-site wiring and maintenance safer and more efficient.
The technical parameters of major components have been standardized, achieving functional improvements and reserving interfaces for future intelligent management of low-voltage distribution networks.
Regarding the testing and inspection of standardized low-voltage switchgear, in accordance with relevant national standards and CCC certification requirements, comprehensive, rigorous, and detailed specifications have been established for various tests of standardized low-voltage switchgear. Test indicators, test methods, and judgment criteria have been unified, further strengthening the quality control of standardized low-voltage switchgear manufacturing processes, components, and raw materials, laying a solid foundation for the safe and reliable operation of the equipment.
1 Typical Structural Scheme
1.1 General Provisions
To facilitate equipment management, the product name code for standardized low-voltage switchgear of State Grid Corporation of China is set as "SLVA," where SLVA is an acronym for Standardized Low-Voltage Assemblies, hereinafter referred to as "SLVA low-voltage switchgear."
The typical structural scheme of SLVA low-voltage switchgear comprises 4 major categories and 8 subcategories. The 4 major categories are incoming line cabinets, bus tie cabinets, feeder cabinets, and reactive power compensation cabinets. The 8 subcategories are: 1 category each for incoming line and bus tie cabinets; 4 categories for feeder cabinets; and 2 categories for reactive power compensation cabinets.
1.2 Incoming Cabinet (Option 1)
The incoming line cabinet (Scheme 1) is divided into two schemes: left-in and right-in. See Figure 1-1.
Figure 1-1 Incoming Feeder Cabinet (Option 1)
(a) Left inlet; (b) Right inlet
1.3 Bus-tie Cabinet (Scheme 2)
The bus-tie switchgear (Scheme 2) is available in two configurations: left bus tie and right bus tie. See Figure 1-2.
Figure 1-2 Bus-tie Cabinet (Scheme 2)
(a) Left Bus Coupler; (b) Standardized Design Scheme for the Low-Voltage Switchgear of the Right Bus Coupler (2020 Edition)
1.4 Feeder Cabinets (Scheme 3–Scheme 6)
1.4.1 Feeder Cabinet 1 (Scheme 3), suitable for a two-circuit frame circuit breaker arrangement with left–right mounting (2 × 630 A). See Figure 1-3.
Figure 1-3 Feeder Cabinet 1 (Scheme 3)
1.4.2 Feeder Cabinet 2 (Scheme 4), suitable for a three-way frame circuit breaker installation configuration with upper, middle, and lower mounting (3 × 630 A). See Figure 1-4.
Figure 1-4 Feeder Cabinet 2 (Scheme 4)
1.4.3 Feeder Cabinet 3 (Scheme 5), suitable for a six-circuit molded-case circuit breaker installation configuration (4 × 400 A + 2 × 250 A). See Figure 1-5.
Figure 1-5 Feeder Cabinet 3 (Scheme 5): Standardized Design Scheme for Low-Voltage Switchgear Cabinets (2020 Edition)
1.4.4 Feeder Cabinet 4 (Scheme 6), suitable for a four-way molded-case circuit breaker installation configuration with top, bottom, left, and right mounting (4 × 630 A). See Figure 1-6.
Figure 1-6 Feeder Cabinet 4 (Scheme 6)
1.5 Reactive Power Compensation Cabinet (Scheme 7–Scheme 8)
1.5.1 Reactive Power Compensation Cabinet 1 (Scheme 7), with SVGs selected according to the requirements of each operating unit. See Figure 1-7.
Figure 1-7 Reactive Power Compensation Cabinet 1 (Scheme 7)
1.5.2 Reactive Power Compensation Cabinet 2 (Scheme 8) employs intelligent capacitors. See Figure 1-8.
Figure 1-8 Reactive Power Compensation Cabinet 2 (Scheme 8)
Product Keywords: High-Voltage Switchgear | Low-Voltage Switchgear | Enclosed Complete Sets of Equipment
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