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China DRM-12 SF6 Gas Insulated Switchgear Factory & Suppliers - High-Quality Standardized Ring Cabinet
Model and meaning
Product description
DRM-12 Fully insulated and fully enclosed main ring unit switchgear (standardized) independently developed by our company has been listed as a high-tech product of Zhejiang Province by China’s National High-Voltage Electrical Apparatus Testing Center in type test and Zhejiang Province High-Tech Technology Project. it is widely used in 10kv/6kv power distribution systems and is preferred by various urban and rural users of power distribution systems.
The switchgear is modular and can be combined for various purposes; it consists of two categories: non-expandable unit combination and expandable unit combination, to meet the needs of various power substations in flexible applications of compact switchgears.
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) is a completely sealed system, with all live parts and switches enclosed in a stainless steel shell. The whole switchgear isn’t influenced by external environmental conditions to guarantee reliable operation and personal safety and is free from maintenance. By an expandable bus, any combination is available and fully modular. The expandable bus is insulated and shielded safely to guarantee high reliability and safety. DRM-12 inflatable switchgear can also provide TV-based automation solutions with a concept of intelligent switchgear and minimize the work of on-site installation and commissioning.
DRM-12 Fully insulated and fully enclosed main ring unit switchgear (standardized) has non-expandable standard configuration and expandable standard configuration. Owing to its fully-modular and half-modular combination and expandability it is especially flexible.
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) conforms to GB standards. Its design life is over 30 years in indoor conditions (20° C).
Performance index
SF6 Gas & Enclosure
SF6 gas pressure
Absolute pressure 0.04Mpa at 20°C
Annual gas leak rate
0.05%
Ingress protection
IP67
Stainless steel thickness of gas chamber
3.0mm
Bus & Color Specifications
Bus in switchgear
400mm²Cu
Switchgear grounding bus
150mm²Cu
Switchgear front panel color
RAL7012
Side panel & cable cover color
RAL7035
Normal Work Conditions
Maximum temperature
+40°C
Minimum temperature
-40°C
Maximum average relative humidity
≤95%
Altitude
≤2000 m
Compliant Standards
IEC60056 • IEC60129 • IEC60265 • IEC60298 • IEC60420 • IEC60694
Main Features
The fully insulated and fully enclosed (standardized) main ring unit metal switchgear adopts SF6 gas as arc extinguishing and insulating medium.
✔ Reliable operation
The switchgear is fully enclosed and fully insulated, the bus, switches and live parts are completely enclosed in its stainless steel shell. The cavity is filed with SF6 gas at 0.04Mpa, and its ingress protection is IP67. The whole switchgear is not influenced by external environmental conditions, even in special conditions such as short-time water immersion, its normal operation is guaranteed and it is free from maintenance for its whole life.
✔ Operation safety
The switchgear is equipped with a perfect five-protection interlocking to prevent any personnel injury or fault due to any error in operation. All switchgears are equipped with reliable pressure relief channels to guarantee operators personal safety in special conditions.
✔ Flexible configuration
The switchgears are divided into two types: non-expandable combination and expandable combination, with cabling from the front or cabling from the side or expanded from the side according to various installation positions. The cabinet is easy to install, is ideal for a small space or an area with unfavorable environmental conditions. The switchgear can be equipped with electric actuator, remote control and monitoring device according to various users needs.
✔ Widely applicable
With great feeder capacity and a small area occupied for various applications.
Design description
◆ Technical description
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) is installed on a galvanized sheet frame with switchgear inside an SF6 gas tank made of corrosion-proof and non-magnetic 3mm-thick stainless steel sheet. The SF6 gas tank is a "sealed pressure system” that can run for 20 years in normal work conditions. The SF6 gas normal operation pressure is 0.03-0.25Mpa. The gas tank is equipped with a pressure relief device to guarantee that the gas can be relieved from the bottom or the back when the pressure is too high.
◆ Switchgear
The load switch with coaxial rotating double-breakpoint method is operated in a same operation hole and a same slide plate to carry out kinetic operation, so it can only be in one of the three states of “closing, breaking, grounding” at any time to prevent any error in operation.
◆ Actuator
The switch actuator is installed in the front of the gas tank and is treated by special technique to be corrosion-proof, easy to operate and maintain manually or actuate electrically.
Frequently Asked Questions
What is the design life of the DRM-12 switchgear?
The design life of the DRM-12 fully insulated and fully enclosed main ring unit switchgear is over 30 years under indoor conditions (20°C).
What is the ingress protection (IP) rating of this switchgear?
The switchgear has an Ingress Protection rating of IP67, ensuring it is completely protected against dust and can withstand short-time water immersion.
How does the switchgear handle excessive gas pressure?
The SF6 gas tank is equipped with a reliable pressure relief device that guarantees gas can be safely relieved from the bottom or the back if the pressure becomes too high.
What are the environmental limits for normal operation?
The DRM-12 operates reliably in temperatures ranging from a minimum of -40°C to a maximum of +40°C, with a maximum average relative humidity of ≤95% and altitudes up to 2000 meters.
How does the switchgear prevent operational errors?
It features a perfect five-protection interlocking system. Additionally, the load switch uses a coaxial rotating double-breakpoint method operated via a single operation hole and slide plate, allowing only one of three states ("closing, breaking, grounding") at any time.
Is the DRM-12 switchgear customizable or expandable?
Yes, it is designed with modularity in mind. It consists of both non-expandable and expandable unit combinations. With an expandable bus, any combination is available to meet various power substation layout requirements.