Vifaa vya Kubadilisha 24kV haijanavyo tabia ya hewa kwa mitandao yenye uzima wa mazingira | Nu1

Muda wa huduma unao matumizi wa miaka 30-40, kuingia mbele, utaratibu mdogo sawa na SF6-GIS, hakuna kusimamia hasara ya viwango vya SF6 – rahisi kwa hali ya tabia, uzio kamili wa hewa chafu. Switchgear Nu1 ni imefungwa kwenye chombo cha kifaa, imefunika na viwango, ina unduonge wa circuit breaker wenye uwezo wa kupungua, na imefanyiwa majaribio ya aina kulingana na viwango vya muhimu, imethibitishwa na laboratori ya kimataifa STL.

Viwango vya Umoja

• 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

Viwango vya Umeme

• 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

Mizizi

• Width: 650 mm (1250 A), 900 mm (2000 A)

• Height: 2400 mm

• Depth: 1500 mm

Uzio wa Hewa Chafu

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

Kulingana na 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.

Matukio ya Rahisi Kwa Mtumiaji:

• 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.

Uzio 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