SRM16-12/24 Fully insulated inflatable cabinet

SRM16-12/24 fully insulated and gas-filled switchgear is widely used in 10kV/20kV power distribution systems and is the preferred switch product for substations and distribution systems of various users in urban and rural areas.

Overview

The SRM16-12/24 fully insulated gas-insulated switchgear is widely used in 10kV/20kV power distribution systems and is the preferred switch product for urban and rural power distribution systems of various users. 
The switchgear is a modular unit mode, which can be combined according to different uses; it consists of two major categories: fixed unit combination and expandable unit, meeting the needs of various substations for flexible use of compact switchgear.

Overview Continued

The SRM16-12/24 fully insulated gas-insulated switchgear is a completely sealed system, with all live parts and switches enclosed in a stainless steel housing. The entire switching device is unaffected by external environmental conditions, ensuring operational reliability and personal safety, and achieving maintenance-free operation. By selecting expandable busbars, any combination can be achieved, achieving full modularity. The safe insulation and shielding of the expansion busbars ensure high reliability and safety. The SRM16-12/24 gas-insulated switchgear also provides TV-based automation solutions, forming the concept of intelligent switching, and minimizing on-site installation and commissioning work. 
The SRM16-12/24 fully insulated gas-insulated switchgear is divided into non-expandable standard configuration and expandable standard configuration. Due to its combination of full modules and half modules and its own expandability, it has extremely special flexibility. 
The SRM16-12/24 fully insulated gas-insulated switchgear complies with GB standards. 
Design life exceeding 30 years under indoor conditions (40℃) and outdoor conditions (-50℃)

Main Features

◆ SRM16-12/24 fully insulated gas-insulated switchgear uses SF6 gas as the arc extinguishing and insulating medium. 
◆ The switchgear is a fully sealed, fully insulated structure; busbars, switches, and live parts are completely enclosed in a stainless steel housing. The cavity is filled with 1.4bar of SF6 gas, and the protection level reaches IP67: the entire switching device is completely unaffected by external environmental conditions, ensuring normal operation of the switch even under extreme conditions such as short-term water immersion, and the product is maintenance-free for life. 
◆ The switchgear has a complete "five-proof" interlocking device, which completely eliminates the possibility of human error causing personnel and equipment operation failures. 
◆ All switchgears have reliable safety pressure relief channels to ensure the personal safety of operators even under extreme conditions. 
◆ The switchgear is divided into two categories: fixed unit combination and expandable unit combination. 
◆ The switchgear usually has front-in and front-out wiring, but can also achieve side-out or side-expansion according to different installation positions. 
◆ The cabinet size is easy to install and can be suitable for places with limited space and poor environmental conditions. 
◆ The switchgear can be configured with electric, remote control, and monitoring devices according to the different needs of users.

Performance Indicators

Technical Parameters

Technical features

◆ Fully sealed structure, ultra-strong environmental adaptability 
The energized parts are completely sealed in a SF6 gas enclosure with 0.04Mpa. The current input and output parts all adopt touchable cable connectors. All energized parts are fully sealed and insulated. Therefore, this product can operate safely in harsh environments such as high altitude areas, strong wind and sand, high salt fog, severe pollution and serious humidity; 
◆ Small product size, flexible expansion 
Modular design scheme, flexible combination of each unit, the gas enclosure can be expanded to the left and right, and can be disassembled separately, maximizing the satisfaction of various complex and diverse power distribution design schemes in different regions; 
◆ Advanced design methods are used to ensure product performance parameters 
Computer three-dimensional simulation technology is used to conduct electric field simulation analysis, magnetic field simulation analysis and mechanism motion simulation analysis to ensure the accuracy of technical parameters; 
◆ Advanced welding and sealing technology 
The stainless steel plates of the gas enclosure are laser cut, welded by ABB welding robots, fully ensuring the dimensional accuracy and welding quality of the plates. Isobaric vacuum and helium leak detection technology are used to ensure the sealing performance. The measured annual SF6 gas leakage rate reaches 0.01%; 
◆ Advanced cleaning technology 
The gas enclosure adopts ultrasonic cleaning technology, and the product assembly is carried out in a clean room to ensure that the moisture content in SF6 gas reaches below 150ppc, which is higher than the national standard requirements; 
◆ Intelligent online monitoring and protection methods can be realized 
The switchgear can be connected through the communication network and automation system to realize the "three remote" functions of remote control, remote measurement, and remote signaling of the switchgear, and can also realize fault isolation, recovery and network reconstruction of the power distribution network; 
◆ User-friendly operation interface, perfect "five-proof" design 
The switchgear can be manually or electrically operated, the operation process is simple and reliable, and the overall structure has a perfect "five-proof" interlock design; 
◆ Dedicated cable branch box application scheme 
Due to the increasing application of distributed ring network switch stations, the XGHS6 series switchgear has specially designed a scheme where the busbar can be connected to the left and right sides through bushings, suitable for cable branch boxes with one or more load switches, providing users with a flexible and economical power distribution scheme.

Structural features

◆ Cabinet 
The cabinet is assembled by bending 2mm aluminum-zinc plated steel sheets, supporting the main gas enclosure and protecting the switchgear operating mechanism and external components. The front panel of the cabinet has a primary scheme simulation diagram, switch status indication, operating holes, etc. 
The gas enclosure is welded from 3mm 304 stainless steel plates and contains the primary energized components of the switchgear. The gas enclosure is welded by a welding robot, and isobar vacuum and helium leak detection technology are used to ensure the sealing performance. A density relay is installed on the enclosure to observe the gas pressure inside the enclosure, and a burst diaphragm is also installed on the enclosure. When an internal arc fault occurs, the burst diaphragm ruptures and releases the fault gas, ensuring minimal user loss. 
◆ 气箱
气箱为 3mm 304 不锈钢板焊接，内装有开关设备的一次带电部件，气箱采用焊接机器人焊接，通过等压抽真空和氦检漏技术，保证产品的密封性。箱体上装有密度继电器以观测箱体内气体压力，箱体还装有防爆膜片，当发生内部电弧故障时，防爆膜片破裂，释放故障气体，保证用户最小损失。
◆ Load switch / Ground switch 
Load switches are available in two-position (ON - OFF) and three-position (ON - OFF - Ground) structures. 
Ground switch: The ground switch and load switch are interlocked for safe operation. 
Vacuum circuit breaker/isolator: The circuit breaker options include V and CB options. The V option is an integrated structure of the isolator and circuit breaker, with the circuit breaker located on the busbar side; the CB option is an independent unit of the vacuum circuit breaker and its operating mechanism, with the circuit breaker located on the cable side. 
◆ Operating mechanism 
1. Three-position load switch operating mechanism: 
◇ T type: "ON", "OFF", and "Ground" are all manually operated, used for cable infeed and outfeed cabinets; 
◇ TR type: Similar to the T type, the difference is that the spring is energized during manual ON operation for OFF preparation, and can be controlled by a knob, OFF coil, fuse, or relay, used for combination electrical appliances. 
◇ TM type: Similar to the T type, with added electric "ON" and "OFF" operation. 
◇ TRM type: Similar to the TR type, with added electric "ON" and "OFF" operation. 
2. Operating mechanism for three-position isolator of vacuum switch and vacuum circuit breaker cabinet: 
◇ T1 type: Equipped on the V-type circuit breaker cabinet. 
◇ T2 type: Equipped on the CB-type circuit breaker cabinet. 
3. Operating mechanism for vacuum switch and vacuum circuit breaker: 
◇ The operating mechanism for vacuum switch and vacuum circuit breaker is suitable for both V and CB options of the circuit breaker cabinet; 
◆ Fuse 
In the F cabinet, the fuse is first installed on the fuse support, and then inserted into the fuse insulator tube. 
Three fuse insulator tubes in a Y-shape distribution are located inside the air box and are well sealed with the air box. After the fuse support is inserted into the insulator tube, the insulator tube is isolated from the outside world, ensuring that it is not affected by external dirt, and any phase fuse blowing can trigger the striker, driving the quick interlocking mechanism to achieve load switch OFF.