Mdgear 550 Solid Insulation Metal-Clad Switchgear

Model NO.: MDGear550


Rated Voltage: 7.2/12kv


Trademark: Mingde Switchgear


Origin: Cixi, Ningbo, Hangzhou Switchgear




Rated Insulation Voltage: 7.2/12kv


Rated Frequency: 50-60Hz


Specification: ISO9001/OHSAS/OHSMS 18001


HS Code: 85372090



MDGear 550 Solid Insulation Metal-Clad Switchgear



MDGear 550 is mid-mounted withdrawal switchgear with the minimum volume and the maximum insulation performance. It adopts the APG solid insulation and silicon rubber sealing technology.



Complete products series: MDGear550 series of switchgear can provide a complete product series which has greatly enriched the modularized solution and has improved the switch design service efficiency.



Adopting the latest structural modular design philosophy, the switchgear is divided into three modules: powerhouse module, busbar compartment module and cable compartment module. It can also be composed of various module combination solution. Each solution can make any combination by independent cable compartment module change or powerhouse and busbar compartment module change, which ensures the consistency of MDGear550 switchgear service and the maintenance procedure.



Flexible solution: MDGear550 switchgear can provide various solutions to meet the on-site customers' requirements. It can provide a series of solutions, even in the severe environment, to fully meet the on-site installation and operation requirements.



High safety performance: MDGear550 switchgear is equipped with a complete mechanical safety interlock system to prevent the incorrect operation.



High reliability: Based on the long-term practical operation experience in medium voltage switchgear, MDGear550 switchgear contains the specific medium voltage switchgear requirements from customers in various industries. It is a combination of the operation experience and the innovative technology.



MDGear550 can support the rated current from 630 to 2000A and it is designed to accommodate VMD-12 Vacuum Circuit Breaker, with the height and depth of switchgear and the busbar rated current in consistency. With 450, 550, 650, 750 in width, the dimension of MDGear550 is less than other standard switchgear dimension, making it a very compact and versatile product.



MDGear550 can be positioned against the wall. This in turn allows all service and maintenance operations to be carried out directly from the front. Accessing the cable area is particularly convenient by simply removing the base of the circuit-breaker of the circuit-breaker compartment. The maintenance personnel can easily access to the busbar and cable section to carry out the maintenance, which makes it easy to maintain the internal electrical apparatus.



The cable is connected with the main switch's lower contacts through the cable conjoined insulator or cable connector in the cable compartment. In general, copper cable conjoined insulator: If the width of the switchgear is 550mm, the cable shall be connected to the copper bar, with each phase connecting three cables; If the width of the switchgear is 650mm or 750mm, and the depth is 1350mm, the cable shall be connected to the copper bar, with each phase connecting to six cables.



Ring core current transformer is the standard configuration of MDGear550 series of 450-550mm switchgear, with the current under 1250A. If the width of the switchgear is 550mm or 650mm, block type current transformer is optional.



MDGear550 switchgear has undergone all the tests required by the international standards (IEC) and GB.



Normal Operation Conditions



Maximum ambient temperature: +40ºC

Minimum ambient temperature: -15ºC

Maximum 24h average of temperature: +35ºC

Maximum 24h average of relative temperature: +95%

Maximum monthly average of relative humidity: 90%

Maximum altitude above sea level: 2500m

Maximum seismic intensity: 8 magnitude



Presence of normal, non-corrosive and uncontaminated atmosphere.



Special Service Condition



For the service condition beyond the above normal operation conditions, reconfirmation is required before placing the order.

Special considerations

For the high temperature in many areas of China, the fast and wide temperature fluctuation makes the switchgear operation in danger, prone to be condensation. For this reason, the switchgear shall be equipped with the heating apparatus as soon as possible after the installation. The heater shall be settled by temperature and humidity controller when the switchgear is in standby or discontinuous operation condition.



Degrees of Protection



The degrees of protection of the switchgear conform to IEC 60529 Standards and GB4208 Standards.



MDGear550 switchgear is normally supplied with the following standard degrees of protection:

IP 4X for the enclosure

IP 2X for the internal main circuit

RAL7035 for the color at the external surface



Applications



Commercial Service Industry



Shopping malls

Office buildings

Banks

Hospitals

Playgrounds

Residential areas

Civilian infrastructure



Utilities and Power Plants



Power generation stations

Substations

Switching station and ring network power supply station

Main and auxiliary switchgear

Industrial and Mining Eatablishments

Petrochemical industry

Paper mill

Cement

Textiles



Transport



Airport

Ports

Railways

Underground transport





Main Parameters

Rated voltage	kV	7.2	12
Rated insulation voltage	kV	7.2	12
Rated power frequency withstand voltage	kv/1min	32	42
Rated lightning impulse withstand voltage	kV	60	75
Rated frequency	Hz	50-60	50-60
Rated short-time withstand current	kA/4s	...40	...40
Rated withstand current(peak)	kA	...100	...100
Busbar rated current	A	2000A	2000A
	A	630	630
	A	1250	1250
Branch busbar rated current	A	1600	1600
	A	2000	2000

Structural Diagram



Functional Compartments



Each switchgear unit consists of three power compartments: power compartment, busbars, cable and low voltage compartment;

The gas exhaust duct is positioned above the switchgear and runs along its whole length. Each power compartment is fitted with a flap on its top surface. The pressure generated by the fault makes it open, allowing the gas to pass into the duct.

Evacuation from the room of the hot gases and incandescent particles produced by the internal arc must normally be carried out.

The compartment is segregated from each other by metallic partitions.



Modularized Function



The switchgear adopts the modularized structure, which consists of three cabinet modules: power compartment, busbar and cable module.

Each module can realize on-site combination change function.

All the compartments are accessible from the front and maintenance operations can correctly be carried out with the switchgear installed up against a wall.





Photo Gallery

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