Product Overview

The FSE-12 environmentally friendly gas-insulated ring main unit is a complete switchgear assembly for 12 kV, three-phase, 50 Hz AC systems, designed for single-bus and single-bus sectionalized configurations. This product features a simple structure, flexible operation, reliable interlocking, and easy installation, enabling it to deliver satisfactory technical solutions for a wide range of applications and diverse customer requirements. The integration of sensor technology and information technology, combined with advanced performance characteristics and versatile, flexible configuration options, ensures that the product can meet evolving market demands and comply with smart grid requirements. The environmentally friendly gas-insulated ring main unit is suitable for industrial and civil cable ring networks as well as distribution network terminal projects. It is primarily used for the reception and distribution of electrical energy and is particularly well suited for distribution in urban residential areas, small secondary substations, switchgear stations, cable branch points, packaged substations, industrial and mining enterprises, shopping malls, airports, subways, wind power generation facilities, hospitals, stadiums, railways, tunnels, and other similar applications.
The FSE-12 environmentally friendly gas-insulated ring main unit complies with relevant national standards, power industry standards, international standards, and other applicable specifications. Its switchgear and key electrical components are integrated modules; the phase-to-phase conductive parts are encapsulated in solid insulation, external wiring is connected via shielded cable terminations, and the busbars connecting the functional units are shielded insulated busbars. As a result, operational safety is significantly enhanced. The operating mechanism employs a spring-operated design with a mechanical life exceeding 10,000 operations. All operational data and equipment status can be remotely monitored and supervised, enabling unattended operation. It is truly a high-performance distribution device. Inside the cabinet, the following units can be selected to form an economical and practical power supply configuration: vacuum circuit breaker unit (630 A, 20–25 kA) or vacuum load switch unit (630 A, 20–25 kA).

Terms of Use

● Altitude: ≤2000 m;
● Ambient temperature: -40°C to +70°C;

● Daily average ≤35°C;

● Relative air humidity: daily average ≤ 95%, monthly average ≤ 90%;

● An environment free from significant contamination by corrosive or flammable gases, etc.;
● Seismic resistance: Grade 8;

● Protection rating: IP67 for live parts enclosure; IP4X for the exterior of the switchgear.
● The surrounding air shall be free from significant contamination by corrosive flammable gases, water vapor, and other such substances.
● Locations free from frequent severe vibrations; under harsh conditions, the severity of the design shall meet all applicable requirements.
● When used under normal ambient conditions that exceed the requirements specified in GB/T 3906, such arrangements shall be agreed upon by the user and our company.

Implementation Standard

GB/T 11022 Common Technical Requirements for High-Voltage Switchgear and Control Equipment Standards; GB/T 3906 3.6–40.5 kV AC Metal-Enclosed Switchgear and Control Equipment; GB/T 1985 High-Voltage AC Isolating Switches and Earthing Switches; GB/T 3804 3.6–40.5 kV AC High-Voltage Load Switches; GB/T 1984 High-Voltage AC Circuit Breakers; GB/T 4208 Degrees of Protection Provided by Enclosures (IP Code); GB/T 7354 Partial Discharge Measurement; GB/T 311.1 Insulation Coordination—Part 1: Definitions, Principles, and Rules; IEC 62271-200; IEC 60265-1; IEC 62271-102; IEC 62271-100; IEC 60694.

Main Features

● Wide applicability: The absence of any toxic or hazardous gases ensures the safety of the operating environment, whether in basements, tunnels, on ships, or in various indoor and outdoor settings. The high-pressure enclosure can be filled with dry air or nitrogen, making it suitable for harsh conditions such as high altitudes, strong winds and sandstorms, low temperatures, severe cold, stringent environmental requirements, frequent operation, and applications requiring condensation prevention. With fully insulated and sealed construction, the equipment can withstand brief submersion in floodwaters and resume operation after simple cleaning procedures.

● High safety: A sophisticated interlocking system ensures clear visibility of the three-phase isolation breaks, effectively preventing misoperation accidents. The complete elimination of SF6 gas usage eliminates the risk of explosion caused by insufficient gas pressure, which can degrade insulation performance and arc-extinguishing capability in SF6 ring main units. Enhanced identical isolation structures further prevent single- or multi-circuit short circuits from escalating into or triggering explosion incidents. In addition, the use of explosion-proof vacuum arc-extinguishing chambers and solidly encapsulated pole assemblies provides additional protection for the switchgear.
● Ease of Operation: The isolating switch and earthing switch are equipped with a single operating handle, eliminating the need for identification or concern about operator error. Moreover, when the circuit breaker is in operation, the operating handle for the isolating switch and earthing switch cannot be operated at all, thereby obviating the need for complex technical training. This design makes operation exceptionally simple and effectively prevents operational errors.

● The encapsulated pole is manufactured using the epoxy resin APG process, delivering excellent electrical and mechanical performance. As a critical component of the switchgear, the encapsulated pole serves both as an insulating element and a load-bearing structure, while meeting stringent technical requirements such as heat resistance, cold resistance, crack resistance, high mechanical strength, and superior dielectric strength.
● The switchgear adopts a modular cabinet structure and utilizes standard insulated busbars and cable plug-in connectors manufactured by leading cable accessory suppliers. The switchgear can be assembled on-site and expanded as needed, eliminating the logistical and installation challenges associated with transporting and installing multiple pre-assembled units. Customized modular switchgear configurations are also available upon request.
● Clearly visible, genuine isolation fracture surface
● The entire product line features a unified design, offering a wide range of cabinet configurations to meet customer requirements (including circuit breakers, load switches, potential transformers, busbars, and bus couplers), while maintaining identical external geometric dimensions across all models.
● The switchgear is equipped with intelligent interfaces and mounting locations for sensors, enabling it to meet the requirements of a smart grid when outfitted with intelligent devices.
● The main busbar shall be a standard silicone rubber dry-type busbar.
● A three-position isolating switch is used and installed on the busbar side.
● Completely replace the SF6 load switch ring main unit.

● Environmental Protection: All materials used in the manufacturing of this product are non-toxic and harmless, and no toxic or harmful substances are released during use. Moreover, the materials can be recycled at the end of their service life, thereby ensuring the product’s environmental friendliness.
● Maintenance-free: The environmentally friendly gas-insulated ring main unit features a fully sealed design for the high-voltage switchgear and operating mechanism, eliminating the need for routine cleaning and maintenance and thereby reducing operation and maintenance costs. The switchgear boasts a high degree of automation, with online monitoring functions that provide real-time status updates to users, further enhancing distribution network automation. This also helps reduce labor costs and lower production expenses for power utilities.

Technical Specifications

Standard Cabinet Structure

Upper isolation: 420 mm	375 mm of isolation
350 mm of isolation upwards	Lower isolation: 420 mm
Lower isolation: 375 mm	Lower isolation: 350 mm
Standard Isolated Core Unit Structure (Outline Drawing)	Standard Isolated Core Unit Structure (Outline Drawing)