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