The JSR series gas-insulated compact ring main unit (Gas Insulated Ring Main Unit) is a newly developed type of gas-insulated medium-voltage switchgear, independently developed according to the standardized customization requirements of the State Grid. The product features a modular design that can be arranged arbitrarily according to different design schemes, achieving a perfect combination of shared-box units and extended units, meeting the flexible use requirements of compact switchgear in various secondary power distribution substations.
The JSR series switchgear is a fully sealed system, with all live parts and switches enclosed within a stainless steel housing, unaffected by environmental conditions. It offers reliable operation, safety assurance, compact structure, small footprint, maintenance-free operation, and long service life.
The product has passed type tests conducted by the national high-voltage electrical apparatus testing center and is widely used in smal
Modular Design
Includes load switch cabinet units (C), circuit breaker cabinet units (V), metering cabinet units (M), bus PT cabinet units, and node cabinet units, with different modules that can be freely combined into a ring main unit.
Fully Insulated and Fully Sealed Design
The GSR8 series ring network switchgear continues the fully sealed design concept of SF6 ring main units and environmentally friendly gas cabinets. It seals the live parts and the switch body within a 2.0mm stainless steel gas tank. The main circuit connects externally through bushings mounted on the gas tank that comply with DIN47636 standards, and connects to input and output line bushings via fully insulated, fully shielded, fully sealed detachable connectors. The gas tank has a protection rating of IP67. Vacuum testing is conducted inside the gas tank to ensure there are no leaks. The interior vacuum removes moisture and humidity, and then dry, clean air at the same pressure as the external environment is filled in to prevent leakage risks associated with conventional pressurized gas tanks. This ensures there is no pressure difference inside and outside the tank, keeping the tank from deforming. A molecular sieve is installed to enhance moisture absorption, ensuring the live components operate in a clean environment. The interior of the gas tank is unaffected by external conditions, providing short-term flood resistance and condensation resistance.
Flexible and Scalable Design
The product uses side or top extension sleeves for connection, avoiding direct contact with live components. It features a modular design, and the extension ports use standard interfaces, allowing for multiple types of insulated ring main units to be combined, enabling product interchangeability and compatibility.
High Safety and Reliability
Equipped with a spring-operated mechanism developed in-house, optimized components, and simplified transmission structure, the mechanism is more stable overall and the transmission is more flexible, with potential for intelligent control expansion. The interlock uses rigid connections, which are more reliable compared to flexible connections. The product features dual interlocking devices, including reliable mechanical and electrical interlocks, to prevent operational errors. The equipment has a dependable pressure release device and venting channel to ensure personal safety in case of a malfunction. It also has a comprehensive mechanical interlock system to prevent operational mistakes.
Operating Structure
The GSR8 series ring main units use a highly reliable, simple spring-operated mechanism with reclosing functionality for the circuit breaker. The energy storage is equipped with a double spring system to ensure balanced energy output, guaranteeing minimal fatigue of the spring during long-term energy storage operation. The isolation mechanism features dual-hole operation with mechanical interlocking between the two operating shafts, effectively preventing misoperation. The isolation-to-close and isolation-to-ground functions each have independent energy release springs, more effectively preventing switch refusal to close or open due to mechanical fatigue.
Switch
The GSR8 series ring network switch adopts a three-phase integrated structure with shaft-driven three-phase switches, ensuring the consistency and synchronization of switching operations across all three phases. The switch has a phase spacing of 200mm, effectively preventing phase-to-phase short circuits. The switch employs mature vacuum arc extinguishing technology for arc quenching, ensuring that the product can effectively interrupt fault currents in the event of a fault. The switch does not require auxiliary gas insulation and fully meets insulation level requirements relying solely on its own creepage distance.
Smart Ring Main Unit System
The GSR8 series ring main units, paired with our JHK-Power smart ring main unit monitoring system, utilize our company's power Internet of Things (IoT) technology combined with online and offline services to realize the concept of intelligent electricity usage for distribution systems with "no on-site staffing and no on-site monitoring." The system, when used with the GSR8 normal-voltage air-insulated ring main unit series, is characterized by its compact size and environmental friendliness. It integrates intelligent control with data services, deeply combining primary equipment and secondary control. Data is collected, analyzed, and processed through an intelligent gateway, stored on a cloud platform, and evaluated using edge algorithms and big data analysis to assess the operation and "health" status of the equipment.
Secondary Circuit Standardization
For the GSR8 series ring main units, the secondary control circuit can be configured according to customer requirements. It can be paired with secondary circuit modules to optimize and combine the secondary circuits between PT cabinets, incoming line cabinets, and outgoing line cabinets into several secondary circuit modules. The module functions replace the traditional multi-component secondary control model, achieving integration. The DTU operation module is eliminated and incorporated into the secondary modules. Connectors use standard rectangular connectors, compatible with both distributed and centralized DTU access requirements. Control cables are implemented with customized wire harnesses to connect between secondary modules, ensuring no exposed terminals.
Advantages:
1) No exposed connection terminals at the terminals, with protection reaching IP54, effectively preventing condensation issues;
2) Terminal-level interchangeability with modular terminal design;
3) Device-level interchangeability using connectors, plug and play;
4) Power modules and accessories such as circuit breakers are integrated into the design, simplifying internal terminal layouts, promoting intelligent development of power modules, and providing opportunities for precise battery management.
Welding and Sealing Technology
The GSR8 series ring network cabinet products draw on advanced industry experience and introduce high-precision CNC laser cutting machines, CNC punching, bending, and other equipment from joint venture brands to ensure the dimensional accuracy of the gas compartment parts. Welding is carried out using ABB welding robots for cold arc welding of the gas compartments, which not only ensures the strength of the welds but also solves the problem of stainless steel welding deformation, ensuring the switch can move freely inside the gas compartment without being affected by compartment deformation. The switch assembly area uses a dust-free workshop with constant temperature and humidity, ensuring that the inside of the gas compartment is free from dust and moisture. Through assembly line operations, the consistency and accuracy of product installation are guaranteed.
