GSR6-27.5kV SF6 Free Gas-insulated Metal-enclosed Switchgear - Product

Product Overview

GSR6-27.5 series environmentally friendly gas-insulated metal-enclosed switchgear (C-GIS) uses dry air (D-air) as the insulating medium. It is a new generation of MV equipment assemblies integrating vacuum arc extinguishing technology, APG solid insulation technology, gas insulation technology and interface insulation technology. The product solution is mainly suitable for electrified railway systems with single-phase or two-phase, rated voltage 27.5kV and a maximum voltage of 31.5kV, such as high-speed railways, passenger dedicated lines and other high-level railway fields.

The product has a modular design, and the solution can be flexibly combined according to the needs of railway users. The products are provided with a sealed pressure system. All the HV live parts of the main circuit are sealed in the stainless-steel gas tank, which is not affected by the environment. The products have the characteristics of intelligence, reliable operation, small size and maintenance-free.

Product features

Quality assurance

Adopt internationally advanced concepts, world-class production, testing methods, laser welding, laser cutting, helium leak detection and other equipment.

Green and high efficiency

The primary component of the product adopts a fully sealed design, which is completely sealed in a sealed gas tank welded by stainless steel plates and filled with a certain pressure of dry air (D-air) insulating medium. The protection level reaches IP67, completely avoiding the impact of the external environment and climate on the switchgear. It can operate reliably in harsh environments such as basements, plateaus, frozen soil, coastal areas and humidity, achieving maintenance-free operation.

Safe and reliable

The product can be operated manually or electrically. The operating mechanism is mature and reliable and it has complete mechanical and electrical interlocking, which can effectively prevent personal injury and equipment damage caused by mis operation.

Compact design

The product design has a compact structure. Compared with the traditional air insulated switchgear, the volume is significantly reduced and the floor area is reduced by 30%-70%, which improves space utilization and effectively reduces the overall project cost.

Intelligent

Microprocessor-based protection and system technology integrates protection, control, metering, detection and communication functions to achieve distribution network automation and digitalization requirements and can be completely unattended.

Technical parameters
Table 1 Technical parameters of switchgear

No.	Name		Unit	Parameter
1	Rated voltage		kV	1×31.5	2×31.5
2	Rated frequency		Hz	50
3	Lightning impulse withstand voltage	Pole to ground, circuit breaker break	kV	200	200
		Between poles		/	325
		Isolating fracture		220	220
4	Main circuit power frequency withstand voltage (1min)	Pole to ground, circuit breaker break	kV	95	95
		Between poles		/	140
		Isolating fracture		118	118
5	Insulating medium			Dry air
6	Gas filled compartment zero gauge pressure 5min power frequency withstand pressure			1.3Ur
7	Rated current of the main busbar/feeder line		A	1250, 1600, 2000, 2500
8	Rated short-time withstand current/duration		kA/s	31.5/4
9	Rated peak withstand current/grounding switch closing current		kA	80
10	Internal arc withstand capability AFL		kA/s	31.5/1
11	Level of protection	Inflatable box		IP65
		Switchgear		IP54
12	Rated inflation pressure (20°C gauge pressure)		MPa
13	Annual air leakage rate		%	≤0.1
14	Overall dimensions	Width	mm	600/900
		Height	mm	2600
		Depth	mm	1900

Table 2 Technical parameters of operation mechanism

Name	Unit	Parameter
Rated operation sequence	/	O-0.3s-CO-180s-CO
Mechanical life	Time (s)	10000
Energy storage motor rated voltage	V	DC110, DC220