Climate-Neutral 24kV Switchgear for Sustainable Grids | Nu1
Expected service life of 30–40 years, front access, compact design equivalent to SF6-GIS, no SF6 gas handling – climate-friendly, 100% dry air insulation. The Nu1 switchgear is metal-enclosed, gas-insulated, featuring a withdrawable circuit breaker design, and has been type-tested according to relevant standards, approved by the internationally recognized STL laboratory.
Compliance Standards
Switchgear: IEC 62271-1 High-voltage switchgear and controlgear – Part 1: Common specifications for alternating current switchgear and controlgear
IEC 62271-200 High-voltage switchgear and controlgear – Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
Circuit Breaker: IEC 62271-100 High-voltage switchgear and controlgear – Part 100: Alternating current circuit breakers
Disconnector / Earthing Switch: IEC 62271-102 High-voltage switchgear and controlgear – Part 102: Alternating current disconnectors and earthing switches
Current Transformer (CT): IEC 61869-2 Instrument transformers – Part 2: Current transformers
Voltage Transformer (VT): IEC 61869-3 Instrument transformers – Part 3: Voltage transformers
Insulation: IEC 60071 Insulation coordination
IP Code: IEC 60529 Degrees of protection provided by enclosures (IP code)
IK Code: IEC 62262 Degrees of protection provided by enclosures against external mechanical impacts (IK code)
Voltage Detection System (VDS): IEC 62271-213 Voltage detecting systems for high-voltage switchgear and controlgear
Operation: EN 50110 Operation of electrical installations
Installation: IEC 61936-1 Power installations exceeding 1 kV AC
Environmental Conditions: IEC 60721-3-3 Classification of environmental conditions
Electrical Ratings
Rated Voltage (Ur): 24 / 36 kV
Power Frequency / Impulse Test Voltage (Ud/Up): 50/125 / 70/170 kV
Rated Frequency (fr): 50/60 Hz
Rated Busbar Current (Ir): 2500 A
Rated Feeder Current: 1250 / 2000 A
Rated Peak Withstand Current (Ip): 78.8 / 81.9 kA
Rated Short-Time Current (Ik): 31.5 kA / 3 s
Internal Arc Protection (AFLR): 31.5 kA / 1 s
Operating Temperature: -5 °C to +40 °C
Dimensions
Width: 650 mm (1250 A), 900 mm (2000 A)
Height: 2400 mm
Depth: 1500 mm
Dry Air Insulation Medium
Filling Pressure at 20°C (relative): 200 kPa
Minimum Operating Pressure at 20°C (relative): 180 kPa
Gas Leakage Rate: < 0.1 %/year
Pressure Relief Disc Operating Pressure: ≥ 350 kPa (gauge)
Rated Operating Sequence: O – 0.3 s – CO – 15 s – CO
According to IEC 62271:
Circuit Breaker Durability Class (per IEC 62271-100): M2, E2, C2
Disconnector Durability Class (per IEC 62271-102): M0, E0
Sealed stainless-steel tank for enclosed switchgear.
Dry air insulation medium eliminates the need for SF6 gas handling.
Compact size equivalent to SF6-insulated switchgear.
External cone plug-in system for connecting power cables and solid-insulated busbars
No gas work required for installation, commissioning, or future modifications.
Integrated pressure relief duct system.
Equipped with sensors for real-time monitoring of switchgear operational status.
User-Friendly Features:
Compact design
Accessible control panel
No SF6 – safe and climate-friendly operation
Front access to switchgear
Accessibility:
Cable compartment, current transformers (CTs), and voltage transformers (VTs) accessible from the front of the switchgear.
Easy cable grounding via vacuum circuit breaker ensures safe operation.
Metal-coated VTs, shielding, and touch-safe cables and busbars enhance safety.
Insulation Medium:
Switchgear filled with dry air insulation gas.
Characteristics of dry air:
Non-toxic
No F-gases involved
Climate neutral
Non-flammable
Chemically neutral
Panel Design:
Factory-assembled and type-tested.
Single-pole, solid-insulated, shielded, plug-in busbars.
Maintenance-free.
Vacuum circuit breaker.
Three-position disconnector for disconnection and grounding via circuit breaker.
Protective grounding via vacuum circuit breaker.
Cable connection via external cone plug-in system according to DIN EN 50 181.
Instrument transformers can be replaced without gas handling.
Degree of protection:
IP65 for all high-voltage parts of the main circuit.
IP3X for the switchgear enclosure.
Modular Design:
Current and voltage transformers mounted externally for easy maintenance.
Voltage transformers are metal-coated, plug-in, and disconnectable.
Panel replacement requires no additional gas work or movement of adjacent panels.
Protection and measurement systems can be integrated.
Low-voltage compartment is removable; busbars and instrument transformers are plug-in
Optional: Digital multifunction protection relay with integrated protection, control, communication, operation, and monitoring functions.
Environmental Independence:
The Nu1 consists of switchgear enclosed in a sealed tank inside an outer enclosure. This protects high-voltage components from environmental influences such as:
Harsh environmental conditions
External parameters including:
Salt, dust
Humidity, corrosion
Insects, rodents
High installation altitudes
Maintenance-Free Design:
Nuventura switchgear is enclosed in a sealed, dry-air-insulated tank, providing maintenance-free operation over its service life, ensuring:
Safety of personnel
Reliable and uninterrupted power supply
Sealed pressure system designed for 30 years
Maintenance-free under environmental conditions
Reduced operational costs
Automation and Digitization:
Automation systems and relays ensure timely and conditional operation of the equipment, enabling:
Unidirectional automation and integration into central Supervisory Control and Data Acquisition (SCADA) systems.
Cost-effective and efficient equipment operation based on logic functions, offering flexible and integrated solutions.
Sensor Integration (Optional):
Sensor systems are integrated within the switchgear, enabling:
Real-time health monitoring
Continuous monitoring of gas temperature, partial discharge, quality, and density
Savings on scheduled maintenance costs
Early identification of potential failures before they occur
