40.5kV series SF6 gas-insulated switchgear
| Brand | ROCKWILL |
| Model NO. | 40.5kV series SF6 gas-insulated switchgear |
| Rated voltage | 40.5kV |
| Rated frequency | 50/60Hz |
| Series | NG7 |
Description
NG7-40.5 series SF6 gas-insulated switchgear is a new generation of miniaturized products designed and manufactured by Rockwill according to IEC 62271-200.It has a variety of combinations and can be flexibly extended, which not only meets the requirements of power distribution, but also meets the needs of various secondary distribution application for flexible compact switchgear. It is widely used in public power grids, rail transit, new energy E-house, solar farm, wind farm, data center and other new energy fields.
Product Advantages
- Complete mechanical interlock：The reliable interlock design ensures safety of operators.No any additional tools needed when opening the cableroom door.
- Easy to operate：4m is the most comfortable height for people, combined with reliable mechanical interlocking, which is convenient for the operator.
- Compact structure：The compact design makes the best use any of the space inside the cabinet, and the width of the 420/500 cabinet is the first-class in the industry.
- Flexible extension：The modular design realizes the building block installation of each component, and the field extension is convenient and flexible.
- Lifetime maintenance-free：The live actuated parts are fully sealed inside the gas tank and are not affected by the environment, maintenance-free during its life cycle.
- Adapt to harsh environments：The completely sealed insulating structure makes it extremely adaptable to environmental influences. It is suitable for various harsh environments such as high altitude, high pollution, high salt spray, etc.
Parameters
|
Item |
Unit |
Value |
||
|
Load switch unit (C) Circuit breaker unit (V |
Load switch unit (C) Circuit breaker unit (V |
|||
|
Rated voltage (IEC/GB) |
kV |
36 / 40.5 |
||
|
Rated frequency |
Hz |
50 (60) |
||
|
Rated normal current * |
A |
630(x1.1) |
630/1250(x1.1) |
|
|
Rated short-duration power frequency voltage (1min) |
To earth & between phases (IEC/GB) |
kV |
70 / 95 |
|
|
Across the isolating distance (IEC/GB) |
80 / 118 |
|||
|
Rated lightning impulse voltage |
To earth & between phases (IEC/GB) |
kV |
170 / 185 |
|
|
Across the isolating distance (IEC/GB) |
195 / 215 |
|||
|
Rated power frequency voltage of control and auxiliary circuits (1min) |
kV |
2 |
||
|
Rated short-time withstand current & duration ** |
kA |
25/4 (20/4) |
||
|
Rated peak withstand current ** |
kA/s |
63 (52) |
||
|
Rated short-circuit breaking current ** |
kA |
- |
25 (20) |
|
|
Rated short-circuit making current ** |
kA |
63 (52) |
||
|
Mechanical endurance |
Circuit breaker |
- |
- |
10000 |
|
Load switch / Disconnector |
5000 |
|||
|
Earthing switch |
3000 |
|||
|
Rated functional pressure for insulation and interruption (relative at 20°C) |
Mpa |
0.04 |
||
|
Minimum functional pressure for insulation and interruption (relative at 20°C) |
Mpa |
0.02 |
||
|
Gas leakage rate |
/year |
≤ 0.01% |
||
|
Degree of protection |
Gas tank |
- |
IP67 |
|
|
Gas tank |
- |
IP4X, IK10 |
||
|
Internal arc classification AFLR |
kA/s |
16/1, 20/1, 25/1 |
||
|
Altitude |
m |
≤ 5000 |
||
|
Dimension (Width x Depth x Height) *** |
mm |
420 x 1000 x 1650 500 / 550 x 1000 x 1650 |
420 x 1000 x 1650 500 / 550 x 1000 x 1650 |
|
-
3.6kV-24kV Indoor metal-clad withdrawable switchgear MV Switchgear
-
3.6kV-24kVThe Indoor metal-clad withdrawable switchgear
-
3.6kV 7.2kV 12kV 24kV indoor metal-clad withdrawable switchgear
-
GGD series AC LV fixed type switchgear
-
MNS type 380V 660V LV withdrawable switchgear
-
GCS Type LV withdrawable switchgear
-
GCK LV withdrawable switchgear
-
6kV 6.3kV 12kV 15.6kV 17.5kV Solid-insulated ring main unit /distribution board
-
CKSS-12 Electrical ring main unit switchgear
-
6.9kV 7.2kV 12kV 24kV Solid Insulated Metal-enclosed ring main unit/distribution board
-
Design Solution of 24kV Dry Air Insulated Ring Main UnitThe combination of Solid Insulation Assist + Dry Air Insulation represents the development direction for 24kV RMUs. By balancing insulation requirements with compactness and employing solid auxiliary insulation, insulation tests can be passed without significantly increasing phase-to-phase and phase-to-ground dimensions. Encapsulating the pole column solidifies the insulation for the vacuum interrupter and its connecting conductors.Maintaining the 24kV outgoing busbar phase spacing at 110mm,16/08-2025 -
Optimization Design Scheme for the 12kV Air-Insulated Ring Main Unit Isolating Gap to Reduce Breakdown Discharge ProbabilityWith the rapid development of the power industry, the ecological concept of low-carbon, energy-saving, and environmental protection has been deeply integrated into the design and manufacturing of power supply and distribution electrical products. The Ring Main Unit (RMU) is a key electrical device in distribution networks. Safety, environmental protection, operational reliability, energy efficiency, and economy are inevitable trends in its development. Traditional RMUs are primarily represented16/08-2025 -
Analysis of Common Problems in 10kV Gas-Insulated Ring Main Units (RMUs)Introduction:10kV gas-insulated RMUs are widely used due to their numerous advantages, such as being fully enclosed, possessing high insulation performance, requiring no maintenance, having a compact size, and offering flexible and convenient installation. At this stage, they have gradually become a critical node in urban distribution network ring-main power supply and play a significant role in the power distribution system. Problems within gas-insulated RMUs can severely impact the entire di16/08-2025 -
SF6-Free Solution for Air-Insulated/Eco-friendly Gas Ring Main UnitsⅠ. Technical Bottlenecks of SF₆ SubstitutionInsulation Medium Performance Gapo Dried Air/N₂ insulation strength is only 1/3 of SF₆, requiring expansion of contact gap from 60mm to ≥150mm.o Conventional spring mechanisms lack energy to drive rapid closure of large gaps, easily causing contact ablation due to pre-strike.o Synthetic gases (e.g., C4+CO₂) decompose under arcing, leading to irreversible insulation degradation.Mechanical Structural Limitationso National Grid standardization fix16/08-2025 -
Implementation Scheme for Installing Lightning Arresters or Voltage Transformers in Gas-Insulated Ring Main UnitsAccording to insulation type, ring main units (RMUs) can be categorized as gas-insulated or air-insulated. The former installs primary circuit components in a sealed metal enclosure filled with low-pressure gas (primarily SF₆ or mixed gases) as the insulating medium, using cable terminals for incoming and outgoing lines. Due to superior insulation, compact size, and modular design, they are widely used in 10kV outdoor distribution substations and prefabricated transformer stations. However, thei16/08-2025 -
Pressure Relief Safety Solution for Gas-Insulated Ring Main UnitsⅠ. Problem ContextAs a core component in urban power distribution networks, ring main units (RMUs) are widely used in residential areas, factories, and public buildings due to their compact structure, low cost, and high reliability. However, internal equipment failures or arc faults may generate high-temperature, high-pressure gas, leading to cabinet explosions that endanger personnel and equipment. While traditional sealed designs maintain insulation integrity, they fail to rapidly release sud16/08-2025
