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GTXGN-12 AC Metal Solid Insulated Ring Main Unit

Overview

GTXGN-12 AC Metal Solid Insulated Ring Main Unit is a fully insulated, completely sealed, and maintenance-free solid insulated vacuum switchgear device.
All high-voltage live components are encapsulated with excellent insulating epoxy resin materials, integrating the vacuum arc extinguishing chamber, main conductive circuit, and insulating support into a single unit. The functional units are connected through fully insulated solid busbars.
As a result, the entire switchgear is unaﬀected by external environmental factors, ensuring the reliability of operation and the safety of personnel.
This ring main unit features a simple structure, ﬂexible operation, reliable interlocking, and convenient installation. It is suitable for a 50Hz,12 kV power system and is widely used in industrial and civilian cable ring networks and distribution terminal projects. It serves to receive and distribute electrical energy, particularly suitable for urban residential area distribution, small substations, switching stations, cable branching boxes, box-type substations, and various locations such as shopping malls, airports, subways, wind power generation, hospitals, stadiums, railways, and tunnels.
Due to its fully insulated, completely sealed, and fully shielded advantages, this product is especially suitable for use in harsh environments such as high altitudes, high temperatures, humid heat, extreme cold, and areas with severe pollution.

product details

Product Categories

The switches are categorized based on type into Load Switch with Ground Assembly (C Module), Load Switch without Ground Assembly (CB Module), Circuit Breaker with Ground Assembly (V Module), Circuit Breaker without Ground Assembly (VB Module), Circuit Breaker Link Switch (VZ Module), Load Switch + Fuse Composite Apparatus Switch Assembly (F Module), and Isolating Switch Assembly (G Module).

Model and Definitions

Application Conditions

◇ Environmental Temperature: -45℃ to +45℃

◇ Humidity: Maximum Average Relative Humidity, Daily Average≤95%, Monthly Average≤90%

◇ Altitude:≤4000 meters

◇ Seismic Resistance: 8 degrees

◇ Level of Protection: Live Parts Sealed IP67, Fuse Tubes IP67, Switch Cabinet Housing IP4X

Standards for Implementation

◇ IEC62271-1-2007 "High-Voltage Switchgear and Controlgear - Part 1: General Speciﬁcations"

◇ IEC620071-200-2003 "AC Metal-Enclosed Switchgear and Controlgear for 1-52kV"

◇ GB3906-2006 "AC Metal-Enclosed Switchgear and Controlgear for 3.6-40.5kV "

◇ GB/T11022-1999 "Common Technical Conditions for High-Voltage Switchgear and Controlgear Standards "

◇ GB1984-2003 "High-Voltage AC Circuit Breakers"

◇ GB1985-2004 "High-Voltage AC Disconnectors and Earthing Switches "

◇ GB3804-2004 "High-Voltage AC Load Switches for 3.6kV to 40.5kV "

◇ DL/T404-2007 "AC Metal-Enclosed Switchgear and Controlgear for 3.6kV-40.5kV "

◇ DIJT5932006 "Common Technical Conditions for High-Voltage Switchgear and Controlgear Standards"

◇ Q/GDW730-2012 "Technical Conditions for 12kV Solid Insulated Ring Main Units"

Technical Parameters

◇ Parameters of Switchgear

No.			Units	Parameters
Nominal Voltage			KV	12
Rated Frequency			Hz	50
Rated Currency			A	630	1250
Nominal Insulation Level	Power Frequency Withstand Voltage	Break Point	KV	48
		Phase-to-Phase	KV	42
		Relative	KV	42
	Lighting lmpulse Withstand Voltage	Break Point	KV	85
		Phase-to-Phase	KV	75
		Relative	KV	75
Rated Short-circuit Breaking Current(1s)			KA	25	31.5
Rated Short-time Withstand Current(4s)			KA	25	31.5
Rated Peak Withstand Current(lp)			KA	36	80
Rated Circuit Making Current(Peak)(1ma)			KA	36	80
Level of Protection for Shell				IP4X
Operation Mode				Spring-operated

◇ Isolation Ground Switch Technical Parameters.

No.	ltems		Units	Parameters
1	Nominal Voltage		kV	12
2	Rated Currency		A	630	1250
3	4S Rated Short-time Withstand Current (Valid Value)		kA	25	31.5
4	Rated Peak Withstand Current (Peak)		kA	63	80
5	1min Power Frequency Withstand Voltage	Phase-to-Phase and Ground	kV	42
		lsolation Break Point		48
6	Rated Lighting lmpulse Withstand Voltage	Phase-to-Phase and Ground	kV	75
		lsolation Break Point		85
7	Main Switch Machinery Service Life		Time	3000
8	Ground Switch Machinery Service Life		Time	3000

Safety and Environmental Protection

◇ Isolation Knife Visible Break Point

The cabinet features a prominent visible window for the Isolation Break Point, allowing personnel to observe the three working positions: isolation engaged, isolation disengaged, and grounding engaged. This design facilitates the on-site staff in determining the position of the isolation knife, ensuring a high level of safety.

◇ Internal Arc Design

Internal Arc Pressure Valve: When an arc occurs inside the product, the pressure will be released through this valve, directing the arc away into the cable trench to prevent accidental injury to operators.

◇ Green and Environmentally Friendly

Designed with environmentally friendly materials, this product does not use SF6 gas as an arc extinguishing medium or insulation, thus avoiding environmental pollution. The one-time circuit design minimizes contact points, ensuring low energy consumption during operation.

External Dimensions

Model	Width (mm)	Depth(mm)	Height(mm)
Load Switch PT Cabinet (CPT)	500	950	1650
Circuit Breaker Cabinet (VB)	400	950	1650
Circuit Breaker Cabinet(V)	400	950	1650
Circuit Breaker Bus Coupling Cabinet (VZ)	400	950	1650
Busbar Lifting Cabinet(G)	400	950	1650
Load Switch Fuse Combination Cabinet (F)	500	950	1650