C-GIS SF6 MV switchgear

General Description

Typical Applications

• Onshore & offshore wind farm step-up substations with 33kV/35kV grid connection;
• Onshore & offshore energy storage and photovoltaic step-up substations with 33kV/35kV grid connection;
• Step-up and step-down transformation & distribution substations for 33kV/35kV power networks.

Product Features

• Designed and produced complying with relevant GB and IEC standards;
• Equipped with vacuum interruption and fully SF₆ gas-insulated structure;
• Gas tank with IP67 protection grade; no SF₆ refilling required during installation and whole service life under normal operation;
• Suitable for installation at altitude up to 5000 m above sea level;
• Capable of operating in industrial polluted, salt-foggy and humid environment: corrosion class C3 for onshore application and C4 for offshore application.

Service Ambient Conditions

• Altitude: ≤5000 m. Special technical specification shall be specified if operating altitude exceeds 2000 m;
• Ambient temperature: Max. +50℃, Min. -50℃; 24-hour average temperature ≤35℃;
• Ambient humidity: 24h average relative humidity ≤95%; monthly average relative humidity ≤90%;
• Electromagnetic interference: Induced interference amplitude on secondary circuit ≤1.6 kV;
• Installation environment: No explosive or corrosive gas in ambient air; no frequent severe vibration or impact at installation site.

Applicable Standards

• IEC 62271-1:2017 & GB/T 11022-2020: Common specifications for high-voltage switchgear and controlgear
• IEC 62271-200:2011 & GB/T 3906-2020: AC metal-enclosed switchgear and controlgear for 3.6kV ~ 40.5kV
• IEC 62271-100:2017 & GB/T 1984-2014: High-voltage alternating current circuit-breakers
• IEC 62271-105:2021 & GB/T 16926-2009: High-voltage AC switch-fuse combinations
• IEC 62271-102:2001+A1:2011 & GB/T 1985-2014: High-voltage AC disconnectors and earthing switches (corrected typo IEC16271→IEC62271 per industry standard)
• IEC 60529 & GB/T 4208-2017: Degrees of protection provided by enclosures (IP Code)
• GB/T 11023-2018: Test method for SF₆ gas tightness of high-voltage switchgear
• DL/T 402-2016: Technical order specification for high-voltage AC circuit breakers
• DL/T 486-2021: Technical order specification for high-voltage AC disconnectors and earthing switches
• DL/T 403-2017: Purchase specification for 12kV～40.5kV high-voltage vacuum circuit breakers
• DL/T 404-2018: AC metal-enclosed switchgear and controlgear for 3.6kV～40.5kV
• DL/T 593-2016: Common technical specifications for high-voltage switchgear and controlgear

Function Description

1. Side outgoing main busbar: rated current options of 1250A and 2500A
2. Independent busbar compartment: configurable with single or double gas tank layout
3. Three-position disconnector with operating mechanism: manual or motorized operation available
4. Circuit breaker and its operating mechanism: spring operated breaker with auto-reclosing function; manual or motorized charging for spring
5. Mounting of cable terminals and surge arrester: adopted with C-type cable terminal; optional configuration: one set of cable plus arrester or two sets of cables plus arresters
6. Cable compartment: compatible with installation of various specification power cables
7. Pressure relief channel for cable compartment
8. Pressure relief channel for gas tank
9. Circuit breaker compartment
10. Inter-compartment bushing
11. Nameplate
12. Mimic busbar diagram
13. Protection relay unitTechnical Specification: