12-24kv Sf6 Gas Insulated Switchgear Gis Ring Main Unit

12-24kV Sf6 Gas Insulated Switchgear Gis Ring Main Unit

Product verview
MGC Series are a new type of SF6 gas-insulated compact switchgear, in­house developed by Murge, suitable for most switching applications in medium voltage distribution networks. The product, of modular design, allows random combinations . fixed modules or extensible m.dules to satisfy the demands for flexible applications of compact switchgear at secondary substations. 
MGC Series switchgears are a fully gas insulated enclosed system, with all live parts and switches enclosed in a stainless steel tank, so that they are free of environmental impacts and feature reliable operation and ensured safety; compact structure and a small footprint; virtually free maintenance and long service life, and so on. The products have passed the type test by national High-voltage Electrical Apparatuses Testing Center, and found wide applications in small secondary distribution stations, package switching substations, industrial and mine enterprises, airports, railways, business quarters, high-rise buildings, expressways, metros, tunnels as well as places with abominable natural conditions 


Applicable Standards

IEC 62271-100 :2012 High-voltage switchgear and controlgear-Part 100: Alternating-current circuit-breakers 
IEC 62271-105 High-voltage switchgear and controlgear-Part 105: Alternating current switch-fuse combinations 
IEC 62271-102 High-voltage switchgear and controlgear-Part 102: Alternating current disconnect.rs and earthing switches 
IEC 62271-103 High-voltage switchgear and controlgear-Part 103: Switches for rated voltages above 1 kV and up to and including 52 kV 
IEC 62271-200 : 2011 High-voltage switchgear and controlgear-Part 200: AC metal-enclosed switchgear and controlgear for rated voltage above 1 kV and up to and including 52 kV 
IEC 62271-1 : 2007 High-voltage switchgear and controlgear-Part 1: Common specifications 

Service Condition

Altitude:               ≤4000m
Ambient temperature:
Ambient humidity:
Maximum average humidity
Seismic fortification intensify:9 degree
Site environment is free of explosive or corrosive gas, violent shock and impact; pollution level is no more than Class Ill as specified in IEC60815. 
Note:The manufacturer must be consulted in advance if site altitude is over 1000 m so as to adjust the inflation pressure. 
Product Features 
1.Modularized design 
It comprises load break switch module (C), Switch-fuse combination module (F), circuit breaker module V, metering module (M), busbar PT module pηand so on; different modules can form a ring network through random combinations. 
2.Fully insulated and enclosed design 

The primary live parts(main bus) and switch body of MGC switchgear are enclosed in the gas tank welded with stainless steel; the main circuit is connected with external elements via DIN47636 bushing as installed on the gas tank, which is available for connection with I/O cable via the fully insulated and shielded separable connector the degree of protection of the gas tank is up to IP67; the interior of the gas tank, free of the external impact, could resist short-time flood and condensation . 
3.Flexible and extensible design

MGC Series switchgear can be configured to inextensible fixed ring main unit through combination of basic module. (A 6-ways switchgear is the maximum size within one common SF6-tank.) 
Moreover, MGC Series has a unique flexibility due to its extendibility and the possible combination of fully modular and semi modular configurations via the dedicated fully insulated and shielded busbar kit to provide diversified power supply and distribution solutions.

4.High safety and reliability

Primary live parts and switches are enclosed within the stainless steel gas tank for connection with external elements via the bushing to prevent direct contact with live parts; the equipment is provided with reliable pressure relief device and pressure relief duct to ensure the safety of personnel and equipments in case of accidents; it is installed with perfect mechanical interlocking device that can guard s; it is installed with perfect mechanical interlocking device that can guard against maloperation to thr maximum.

5. Independently developed new mechanism 

The independently developed and designed spring operating mechanism optimizes the parts and simplifies transmission mechanism, which makes the whole mechanism more stable and flexible in transmission and can be extended for intelligent control and operation. The interlock is in rigid connection, which is more reliable as compared with soft connection. Components, micro switch and PCB are in modularized integration to facilitate maintenance and repair. 

6. Advanced welded sealing technology 

MGC switchgear aims to strictly control material strength,rigidity and compressed deformation to components such as dynamic seal (switch operation shaft), manometer, high-tension (HV)bushing and explosion relief valve that associated with elastic seal so as to ensure sealing performance through a series of tests and testing approaches.
•     High manufacturing precision of gas tank: Laser cutting and CNC punching, cutting and bending equipments are used to ensure dimensional precision of gas tank parts
•     Ensure dimensional precision of gas tank parts as fabricated by introducing Mitsubishi laser cutting and CNC punching, cutting and bending machines based on advanced industrial experiences; ABB welding robot and full automatic welding procedures are used to ensure high welding efficiency, stable quality of gas tank and perfect weld so as to guard against gas leakage and ingression of external moisture, and ensure stable performnance of MGC Switchgears to the maximum.
•     High-quality control for elements: Such elements as dynamic seal, manometer and high-voltage bushing shall be subjected to be tested by means of helium mass spectrometer leakage detector and X-ray nondestructive detector;relevant insulated parts shall have to pass partial discharge test to ensure high quality and improve sealing performance of gas tank. 
•     In addition to quality control of elements, assembled and inflated gas tank shall be subjected to further 100% leakage detection. 
•     High-standard requirements: Annual leakage rate of SF6 gas is <0.05%, which is much less than the technical requirements of <1% as specified by relevant national standards.

7.Automatlc production line

Production by advanced automatic production line is favorable for improvement of production efficiency and assembly precision as well as optimization of industrial process. 

8.Factory routine test 
•     Product assembly inspection 
•     Helium leakage test 
•     Dielectric test
•     Mechanical characteristic test 
•     Measurement of resistance to main circuit
•     Measurement of gas and moisture content in SF6 gas