Greno Metal-Enclosed AC Ring Main Unit Air Insulated Switchgear

• Certification: ISO9001
• Shell Material: Stainless Steel
• Voltage Level: Medium Voltage
• Installation: Fixed
• Structure: Cabinet
• Current: AC
• Model NO.: GSM
• Transport Package: Wooden Case, by Sea
• Specification: Height 1600mm or 1800mm
• Origin: Xiamen
• Production Capacity: 50000 Sets a Year

Product Description

Greno Metal-Enclosed AC Ring Main Unit Air Insulated Switchgear

Product Description
Air insulated switchgear GSM-12 HV switchgear metal enclosed AC ring main unit is a new HV apparatus which introduced from abroad and accord with the requirement of rural distribution and city distribution in nation. Main switch, operation mechanism and component use the GSC-12/24 model SF6 switch equipment produced  by our company. Also can use the VSG model vacuum circuit breaker according to requirement of customer, operation type is manual and motor.
GSM, the light flexible switchgear developed as a modular, simple to apply design, with fewer components, providing a high reliable, quality and safe product for you, our Customer. By reducing the number of components, utilising modern materials correctly, we have developed an environmentally and user friendly product. The simple design and construction of GSM will stand the test of time for generations to come.
GSM is an air insulated (AIS), metal enclosed, switchgear cubicle design of the next generation developed through continuous innovation and vision to meet the changing market needs.
GSM provides long-term technical solutions for various applications. Safety, user friendliness and environmental con- cerns have been the driving force in the development of the switchgear.

Feature
GSM product provides our Medium Voltage Customer with the best solution for heavy duty switchgear in a size only a little than a single tank Ring Main Unit while including:
the flexibility in meeting our Customers specification and accomodating on future change and upgrading
the options include complete control, measuring and protection systems

Panel structure:
The panel body is enclosed by 2mm aluminium-zinc plated steel plate after multi-bending. It is simple, firm, delicate and peculiar.

1. Busbar compartment: The busbar compartment is located in the top and connect with neighhboring panel.

2. Load break switch is a separated unit with SF6 gas.

3. Cable compartment: Approximate 75% room of connecting cable and installing fuse, earthing switch and PT.

4. Mechanism chamber and interlock: The chamber consists of operating mechanism, mechanism interlock, position indicator, auxiliary contact trip coil, charge indicator and interlock.

5. LV chamber: It is lockted in the top. It mainly used for installing instrument, relay and motor.

6. Circuit breaker compartment: The circuit breaker (SF6 or Vacuum) is located below load break switch.

Pressure release:

A. Upper pressure release: It is mainly used for releasing gas pressure which produced by arc accident in busbar load break switch compartment.

B. Down pressure release: It is mainly used for ealeasing gas pressure which produced by arc accident in cable small compartment.

The upper part of the cubicle, including the busbar compart- ment, the switch disconnector and the mechanism and low voltage compartment is separated from the lower part and the cable compartment. Because of this it is possible to carry out maintenance, repair and upgrading of the unit in the lower module while the switchgear is in service.
 
Switchgear Construction
Top unit

• 3-position switch disconnector 
• Operating mechanism with mechanical position indication
• Enclosure of busbar compartment
• Integrated low voltage compartment for secondary components
• Interlocking unit
• Busbars
• Control cable ducts

Bottom unit

• Enclosure
• Circuit breaker (fixed version)
• Current transformers
• Earthing switches
• Voltage transformers
• Cable entry with cable support

Cubicle Types / Cubicle Program

• Switch  type 
• Switch with Fuse, type 
• Circuit Breaker type 

 
Technical Specification

Rated voltage			kV	12	24
BIL		common value	kV	75	125
		across the isolating distance		85	145
AC withstand voltage		common value	kV	28 ^1)	50
		across the isolating distance		32 ^1)	60
Rated frequency			Hz	50/60	50/60
Rated current		busbar	A	630/1250	630/1250
		feeder	A	630/800/1250^4)	630/1250 ^4)
Rated short-time withstand current		main circuit	kA	25	20
		earthing circuit	kA	25	20
Rated peak withstand current			kA	65	50
Rated duration of short circuit			s	1	1
Arc-fault current, 1s			kA	20	20
Degree of protection, enclosure				IP2XC	IP2XC
Degree of protection, partitions				IP2X	IP2X
Ambient temperature	maximum value		[ºC]	40	40
	maximum value of 24 h-mean			+35	35
	minimum value			-5 ^3)	-5 ^3)
Altitude above sea level			[m]	<1000 ^2)	<1000 ^2)

1) Higher values in accordance with national standards on request
2) Adjustment is necessary for greater altitudes
3) Lower ambient temperature on request.
 

Environment Condition
1. Environmental temperature: -25 ° C to+40 ° C;
2. Altitude: ≤ 1000m;
3. Relative humidity: daily average ≤ 95%, monthly average ≤ 90%;
4. In situations where there are no flammable or explosive substances, no corrosive chemicals, frequent and intense vibrations, and no strong vibrations.
 

"Warmly wecome to Send us any enquiries anytime"