Gas Insulated Switchgear GRM6-12

Product Overview

GRM6(XGN□)-12 fully insulated fully enclosed compact switchgear, which can realize functions of control, protection, measurement, monitoring, communication, etc. is especially suitable for places with small distribution facility site and high reliability requirements, and places with a relatively harsh natural environment and conditions, such as underground, highland and coastal areas. It is mainly used in areas where land is tight and space is limited, high reliability is required, like industrial and mining enterprises and substations, subways, light rail railways, etc.

It combines microprocessor technology, modern network communication technology and new switch manufacturing technology to effectively separate and combine load current and short circuit current. The measurement protection control and communication functions configured inside the device can fully meet the requirements of the distribution automation system.

The conductive parts of the high voltage components such as circuit breakers, three working position switches and load break switches in the main circuit are installed in a sealed cabinet-type stainless steel casing. The biggest feature is that it is not affected by the external environment, and has high reliability and can make the equipment run safely for a long time in places with poor environment; secondly, the size of the high voltage component is reduced, the device is miniaturized, and the parts inside the sealed casing are free from corrosion and rust, thereby eliminating the influence. In addition, with high voltage components with stable performance and long electrical life, maintenance-free or less maintenance requirements can be achieved.

Type Description

Use Conditions

Ambient air temperature: -40℃~+40℃;

Relative air humidity: daily average ≤95%, monthly average ≤90%;

Altitude ≤1500m (under standard inflation pressure);

Seismic intensity ≤9 class;

Places free from fire, explosion, serious contamination, chemical corrosion and severe vibration.

Special Conditions

Manufacturers and end users must agree on special operating conditions that are different from normal operating conditions;

If a particularly harsh operating environment is involved, the manufacturer and supplier must be consulted;

When electrical equipment is installed at an altitude of 1500 meters or more, special instructions are required to adjust the pressure during manufacturing. When the pressure is adjusted, the life of the switchgear itself has no significant effect.

Product Technical Characteristics

Modular design

The switch is divided into fixed module and expandable module group. In the same SF6 insulated air chamber, up to 6 modules can be configured. Switching cabinets with more than 6 modules must be connected with the expansion busbar to realize the semi-module. Structure; full module configuration can also be achieved by using an extended bus between all modules. Through the combination of different functional modules, a simple to complex power distribution scheme can be formed to meet various configuration requirements in the secondary substation and the opening and closing.

Compact structure

Except for the air-insulated metering cabinet, all modules are only 325mm wide and the metering cabinet width is 695mm; the cable joints of all units are the same height to the ground, which is convenient for on-site construction.

Unaffected by the environment

All high-voltage live parts are installed in a sealed stainless steel case. The case is welded with a stainless steel plate and filled with SF6 gas at a working pressure of 1.4 bar. The degree of protection is IP67. It can be used in places where it is installed in damp, dusty, salt spray, mine, box-type substation and air pollution. Even the fuse compartment has an IP67 rating. The extension busbars are completely insulated and shielded to ensure that they are not affected by changes in the external environment.

Highly reliable personal safety

All live parts are enclosed in the SF6 air chamber; the switch has a reliable pressure relief channel, the load and grounding switches are three-position switches, simplifying the interlocking between each other; reliable mechanical interlock between the cable compartment cover and the load switch .

Performance Index

● SF6 gas pressure: 1.4bar under 20℃ (absolute pressure)

● Annual leakage rate: 0.25%/year

● Protection grade

SF6 gas room: IP67

Fuse tube: IP67

Switchgear enclosure: IP3X

● Busbar

Switchgear internal busbar: 400mm²Cu

Switchgear earthing busbar: 150mm²Cu

Thickness of gas room stainless steel enclosure: 3.0mm

● The front panel and the side panel of the switchgear, and the front cover of the cable room, the company's standard color is: jade color 7783; if users have special requirements, please put forward when ordering.

Meet Main Standards

• GB 1984 High-voltage alternating-current circuit-breakers (IEC 62271-100: 2001, MOD)

• GB 1985 High-voltage alternating-current disconnectors and earthing switches (IEC 62271-102: 2002, MOD)

• GB/T 11022 Common specifications for high-voltage switchgear and controlgear standards

• GB 3804 High-voltage alternating-current switches for rated voltage above 3.6kV and less than 40.5kV (IEC 60265-1-1998, MOD)

• GB 3906 Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV (IEC 62271-200-2003, MOD)

• GB 4208 Degrees of protection provided by enclosure (IP code) (IEC 60529-2001, IDT)

• GB 16926 High-voltage alternating current switch-fuse combinations (IEC 6227-105-2002, MOD)

• DL/T 402 Specification of high-voltage alternating-current circuit-breakers (IEC 62271-100-2001, MOD)

•DL/T 403 HV vacuum circuit-breaker for rated voltage 12kv to 40.5kv

• DL/T 404 Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV

• DL/T 486 HV AC disconnectors and earthing switches (IEC 62271-102-2002, MOD)

• DL/T 593 Common specifications for high-voltage switchgear and controlgear standards IEC 60694-2002, MOD)

• DL/T 728 Technical guide for the order of gas-insulated metal-enclosed switchgear (IEC 815-1986, IEC 859-1986)

• DL/T 791 Specification of indoor AC HV gas-filled switchgear panel

Main Technical Parameters

Note 1: depends on the rated current of fuse.

Ordering Instructions

When ordering, the following technical information must be provided

• Main circuit diagram, arrangement diagram, and layout diagram;

• Switchgear secondary circuit schematic diagram;

• If the switchgear is used under special environmental conditions, it should be proposed.

Standard Modules

Each module of the GRM6(XGN□)-12 type switchgear has the following configurations

• See standard configuration and features in "cable connection module without grounding knife"

• C cabinet - load switch module

See standard configuration and features in "load switch module"

•See standard configuration and characteristics in "load switch and fuse combination module"

• V cabinet - vacuum switch module

See standard configuration and features in "vacuum switch module"

• Capacitive voltage indicator for the incoming bushing

• Install a pressure gauge that monitors SF6 density in each chamber

•  Lifting lug

• Operating handle

Optional Configurations

Electric operating mechanism/cable short circuit and ground fault indicator/current transformer and meter

Standard Expansion Modules

Available modules

Note: A single module must add extension before it can be used.